| /* 
  |  ****************************************************************** 
  |  *           C++ Mathematical Expression Toolkit Library          * 
  |  *                                                                * 
  |  * Author: Arash Partow (1999-2024)                               * 
  |  * URL: https://www.partow.net/programming/exprtk/index.html      * 
  |  *                                                                * 
  |  * Copyright notice:                                              * 
  |  * Free use of the C++ Mathematical Expression Toolkit Library is * 
  |  * permitted under the guidelines and in accordance with the most * 
  |  * current version of the MIT License.                            * 
  |  * https://www.opensource.org/licenses/MIT                        * 
  |  * SPDX-License-Identifier: MIT                                   * 
  |  *                                                                * 
  |  * Example expressions:                                           * 
  |  * (00) (y + x / y) * (x - y / x)                                 * 
  |  * (01) (x^2 / sin(2 * pi / y)) - x / 2                           * 
  |  * (02) sqrt(1 - (x^2))                                           * 
  |  * (03) 1 - sin(2 * x) + cos(pi / y)                              * 
  |  * (04) a * exp(2 * t) + c                                        * 
  |  * (05) if(((x + 2) == 3) and ((y + 5) <= 9), 1 + w, 2 / z)       * 
  |  * (06) (avg(x,y) <= x + y ? x - y : x * y) + 2 * pi / x          * 
  |  * (07) z := x + sin(2 * pi / y)                                  * 
  |  * (08) u := 2 * (pi * z) / (w := x + cos(y / pi))                * 
  |  * (09) clamp(-1, sin(2 * pi * x) + cos(y / 2 * pi), +1)          * 
  |  * (10) inrange(-2, m, +2) == if(({-2 <= m} and [m <= +2]), 1, 0) * 
  |  * (11) (2sin(x)cos(2y)7 + 1) == (2 * sin(x) * cos(2*y) * 7 + 1)  * 
  |  * (12) (x ilike 's*ri?g') and [y < (3 z^7 + w)]                  * 
  |  *                                                                * 
  |  ****************************************************************** 
  | */ 
  |  
  |  
  | #ifndef INCLUDE_EXPRTK_HPP 
  | #define INCLUDE_EXPRTK_HPP 
  |  
  |  
  | #include <algorithm> 
  | #include <cassert> 
  | #include <cctype> 
  | #include <cmath> 
  | #include <cstdio> 
  | #include <cstdlib> 
  | #include <cstring> 
  | #include <deque> 
  | #include <functional> 
  | #include <iterator> 
  | #include <limits> 
  | #include <list> 
  | #include <map> 
  | #include <set> 
  | #include <stack> 
  | #include <stdexcept> 
  | #include <string> 
  | #include <utility> 
  | #include <vector> 
  |  
  |  
  | namespace exprtk 
  | { 
  |    #ifdef exprtk_enable_debugging 
  |      #define exprtk_debug(params) printf params 
  |    #else 
  |      #define exprtk_debug(params) (void)0 
  |    #endif 
  |  
  |    #define exprtk_error_location             \ 
  |    "exprtk.hpp:" + details::to_str(__LINE__) \ 
  |  
  |    #if __cplusplus >= 201103L 
  |       #define exprtk_override override 
  |       #define exprtk_final    final 
  |       #define exprtk_delete   = delete 
  |    #else 
  |       #define exprtk_override 
  |       #define exprtk_final 
  |       #define exprtk_delete 
  |    #endif 
  |  
  |    #if __cplusplus >= 201603L 
  |       #define exprtk_fallthrough [[fallthrough]]; 
  |    #elif __cplusplus >= 201103L 
  |       #define exprtk_fallthrough [[gnu::fallthrough]]; 
  |    #else 
  |       #ifndef _MSC_VER 
  |       #define exprtk_fallthrough __attribute__ ((fallthrough)); 
  |       #else 
  |       #define exprtk_fallthrough 
  |       #endif 
  |    #endif 
  |  
  |    namespace details 
  |    { 
  |       typedef char                   char_t; 
  |       typedef char_t*                char_ptr; 
  |       typedef char_t const*          char_cptr; 
  |       typedef unsigned char          uchar_t; 
  |       typedef uchar_t*               uchar_ptr; 
  |       typedef uchar_t const*         uchar_cptr; 
  |       typedef unsigned long long int _uint64_t; 
  |       typedef long long int          _int64_t; 
  |  
  |       inline bool is_whitespace(const char_t c) 
  |       { 
  |          return (' '  == c) || ('\n' == c) || 
  |                 ('\r' == c) || ('\t' == c) || 
  |                 ('\b' == c) || ('\v' == c) || 
  |                 ('\f' == c) ; 
  |       } 
  |  
  |       inline bool is_operator_char(const char_t c) 
  |       { 
  |          return ('+' == c) || ('-' == c) || 
  |                 ('*' == c) || ('/' == c) || 
  |                 ('^' == c) || ('<' == c) || 
  |                 ('>' == c) || ('=' == c) || 
  |                 (',' == c) || ('!' == c) || 
  |                 ('(' == c) || (')' == c) || 
  |                 ('[' == c) || (']' == c) || 
  |                 ('{' == c) || ('}' == c) || 
  |                 ('%' == c) || (':' == c) || 
  |                 ('?' == c) || ('&' == c) || 
  |                 ('|' == c) || (';' == c) ; 
  |       } 
  |  
  |       inline bool is_letter(const char_t c) 
  |       { 
  |          return (('a' <= c) && (c <= 'z')) || 
  |                 (('A' <= c) && (c <= 'Z')) ; 
  |       } 
  |  
  |       inline bool is_digit(const char_t c) 
  |       { 
  |          return ('0' <= c) && (c <= '9'); 
  |       } 
  |  
  |       inline bool is_letter_or_digit(const char_t c) 
  |       { 
  |          return is_letter(c) || is_digit(c); 
  |       } 
  |  
  |       inline bool is_left_bracket(const char_t c) 
  |       { 
  |          return ('(' == c) || ('[' == c) || ('{' == c); 
  |       } 
  |  
  |       inline bool is_right_bracket(const char_t c) 
  |       { 
  |          return (')' == c) || (']' == c) || ('}' == c); 
  |       } 
  |  
  |       inline bool is_bracket(const char_t c) 
  |       { 
  |          return is_left_bracket(c) || is_right_bracket(c); 
  |       } 
  |  
  |       inline bool is_sign(const char_t c) 
  |       { 
  |          return ('+' == c) || ('-' == c); 
  |       } 
  |  
  |       inline bool is_invalid(const char_t c) 
  |       { 
  |          return !is_whitespace   (c) && 
  |                 !is_operator_char(c) && 
  |                 !is_letter       (c) && 
  |                 !is_digit        (c) && 
  |                 ('.'  != c)          && 
  |                 ('_'  != c)          && 
  |                 ('$'  != c)          && 
  |                 ('~'  != c)          && 
  |                 ('\'' != c); 
  |       } 
  |  
  |       inline bool is_valid_string_char(const char_t c) 
  |       { 
  |          return std::isprint(static_cast<uchar_t>(c)) || 
  |                 is_whitespace(c); 
  |       } 
  |  
  |       #ifndef exprtk_disable_caseinsensitivity 
  |       inline void case_normalise(std::string& s) 
  |       { 
  |          for (std::size_t i = 0; i < s.size(); ++i) 
  |          { 
  |             s[i] = static_cast<std::string::value_type>(std::tolower(s[i])); 
  |          } 
  |       } 
  |  
  |       inline bool imatch(const char_t c1, const char_t c2) 
  |       { 
  |          return std::tolower(c1) == std::tolower(c2); 
  |       } 
  |  
  |       inline bool imatch(const std::string& s1, const std::string& s2) 
  |       { 
  |          if (s1.size() == s2.size()) 
  |          { 
  |             for (std::size_t i = 0; i < s1.size(); ++i) 
  |             { 
  |                if (std::tolower(s1[i]) != std::tolower(s2[i])) 
  |                { 
  |                   return false; 
  |                } 
  |             } 
  |  
  |             return true; 
  |          } 
  |  
  |          return false; 
  |       } 
  |  
  |       struct ilesscompare 
  |       { 
  |          inline bool operator() (const std::string& s1, const std::string& s2) const 
  |          { 
  |             const std::size_t length = std::min(s1.size(),s2.size()); 
  |  
  |             for (std::size_t i = 0; i < length; ++i) 
  |             { 
  |                const char_t c1 = static_cast<char_t>(std::tolower(s1[i])); 
  |                const char_t c2 = static_cast<char_t>(std::tolower(s2[i])); 
  |  
  |                if (c1 < c2) 
  |                   return true; 
  |                else if (c2 < c1) 
  |                   return false; 
  |             } 
  |  
  |             return s1.size() < s2.size(); 
  |          } 
  |       }; 
  |  
  |       #else 
  |       inline void case_normalise(std::string&) 
  |       {} 
  |  
  |       inline bool imatch(const char_t c1, const char_t c2) 
  |       { 
  |          return c1 == c2; 
  |       } 
  |  
  |       inline bool imatch(const std::string& s1, const std::string& s2) 
  |       { 
  |          return s1 == s2; 
  |       } 
  |  
  |       struct ilesscompare 
  |       { 
  |          inline bool operator() (const std::string& s1, const std::string& s2) const 
  |          { 
  |             return s1 < s2; 
  |          } 
  |       }; 
  |       #endif 
  |  
  |       inline bool is_valid_sf_symbol(const std::string& symbol) 
  |       { 
  |          // Special function: $f12 or $F34 
  |          return (4 == symbol.size())  && 
  |                 ('$' == symbol[0])    && 
  |                 imatch('f',symbol[1]) && 
  |                 is_digit(symbol[2])   && 
  |                 is_digit(symbol[3]); 
  |       } 
  |  
  |       inline const char_t& front(const std::string& s) 
  |       { 
  |          return s[0]; 
  |       } 
  |  
  |       inline const char_t& back(const std::string& s) 
  |       { 
  |          return s[s.size() - 1]; 
  |       } 
  |  
  |       inline std::string to_str(int i) 
  |       { 
  |          if (0 == i) 
  |             return std::string("0"); 
  |  
  |          std::string result; 
  |  
  |          const int sign = (i < 0) ? -1 : 1; 
  |  
  |          for ( ; i; i /= 10) 
  |          { 
  |             result += '0' + static_cast<char_t>(sign * (i % 10)); 
  |          } 
  |  
  |          if (sign < 0) 
  |          { 
  |             result += '-'; 
  |          } 
  |  
  |          std::reverse(result.begin(), result.end()); 
  |  
  |          return result; 
  |       } 
  |  
  |       inline std::string to_str(std::size_t i) 
  |       { 
  |          return to_str(static_cast<int>(i)); 
  |       } 
  |  
  |       inline bool is_hex_digit(const uchar_t digit) 
  |       { 
  |          return (('0' <= digit) && (digit <= '9')) || 
  |                 (('A' <= digit) && (digit <= 'F')) || 
  |                 (('a' <= digit) && (digit <= 'f')) ; 
  |       } 
  |  
  |       inline uchar_t hex_to_bin(uchar_t h) 
  |       { 
  |          if (('0' <= h) && (h <= '9')) 
  |             return (h - '0'); 
  |          else 
  |             return static_cast<uchar_t>(std::toupper(h) - 'A' + 10); 
  |       } 
  |  
  |       template <typename Iterator> 
  |       inline bool parse_hex(Iterator& itr, Iterator end, 
  |                             char_t& result) 
  |       { 
  |          if ( 
  |               (end ==  (itr    ))               || 
  |               (end ==  (itr + 1))               || 
  |               (end ==  (itr + 2))               || 
  |               (end ==  (itr + 3))               || 
  |               ('0' != *(itr    ))               || 
  |               ('X' != std::toupper(*(itr + 1))) || 
  |               (!is_hex_digit(*(itr + 2)))       || 
  |               (!is_hex_digit(*(itr + 3))) 
  |             ) 
  |          { 
  |             return false; 
  |          } 
  |  
  |          result = hex_to_bin(static_cast<uchar_t>(*(itr + 2))) << 4 | 
  |                   hex_to_bin(static_cast<uchar_t>(*(itr + 3))) ; 
  |  
  |          return true; 
  |       } 
  |  
  |       inline bool cleanup_escapes(std::string& s) 
  |       { 
  |          typedef std::string::iterator str_itr_t; 
  |  
  |          str_itr_t itr1 = s.begin(); 
  |          str_itr_t itr2 = s.begin(); 
  |          str_itr_t end  = s.end  (); 
  |  
  |          std::size_t removal_count  = 0; 
  |  
  |          while (end != itr1) 
  |          { 
  |             if ('\\' == (*itr1)) 
  |             { 
  |                if (end == ++itr1) 
  |                { 
  |                   return false; 
  |                } 
  |                else if (parse_hex(itr1, end, *itr2)) 
  |                { 
  |                   itr1 += 4; 
  |                   itr2 += 1; 
  |                   removal_count += 4; 
  |                } 
  |                else if ('a' == (*itr1)) { (*itr2++) = '\a'; ++itr1; ++removal_count; } 
  |                else if ('b' == (*itr1)) { (*itr2++) = '\b'; ++itr1; ++removal_count; } 
  |                else if ('f' == (*itr1)) { (*itr2++) = '\f'; ++itr1; ++removal_count; } 
  |                else if ('n' == (*itr1)) { (*itr2++) = '\n'; ++itr1; ++removal_count; } 
  |                else if ('r' == (*itr1)) { (*itr2++) = '\r'; ++itr1; ++removal_count; } 
  |                else if ('t' == (*itr1)) { (*itr2++) = '\t'; ++itr1; ++removal_count; } 
  |                else if ('v' == (*itr1)) { (*itr2++) = '\v'; ++itr1; ++removal_count; } 
  |                else if ('0' == (*itr1)) { (*itr2++) = '\0'; ++itr1; ++removal_count; } 
  |                else 
  |                { 
  |                   (*itr2++) = (*itr1++); 
  |                   ++removal_count; 
  |                } 
  |  
  |                continue; 
  |             } 
  |             else 
  |                (*itr2++) = (*itr1++); 
  |          } 
  |  
  |          if ((removal_count > s.size()) || (0 == removal_count)) 
  |             return false; 
  |  
  |          s.resize(s.size() - removal_count); 
  |  
  |          return true; 
  |       } 
  |  
  |       class build_string 
  |       { 
  |       public: 
  |  
  |          explicit build_string(const std::size_t& initial_size = 64) 
  |          { 
  |             data_.reserve(initial_size); 
  |          } 
  |  
  |          inline build_string& operator << (const std::string& s) 
  |          { 
  |             data_ += s; 
  |             return (*this); 
  |          } 
  |  
  |          inline build_string& operator << (char_cptr s) 
  |          { 
  |             data_ += std::string(s); 
  |             return (*this); 
  |          } 
  |  
  |          inline operator std::string () const 
  |          { 
  |             return data_; 
  |          } 
  |  
  |          inline std::string as_string() const 
  |          { 
  |             return data_; 
  |          } 
  |  
  |       private: 
  |  
  |          std::string data_; 
  |       }; 
  |  
  |       static const std::string reserved_words[] = 
  |       { 
  |          "assert",  "break", "case", "continue", "const",  "default", 
  |          "false", "for", "if", "else", "ilike", "in", "like",  "and", 
  |          "nand",  "nor",  "not",  "null",  "or",  "repeat", "return", 
  |          "shl",  "shr",  "swap",  "switch",  "true",  "until", "var", 
  |          "while", "xnor", "xor", "&", "|" 
  |       }; 
  |  
  |       static const std::size_t reserved_words_size = sizeof(reserved_words) / sizeof(std::string); 
  |  
  |       static const std::string reserved_symbols[] = 
  |       { 
  |          "abs", "acos",  "acosh", "and",  "asin", "asinh",  "assert", 
  |          "atan", "atanh",  "atan2", "avg",  "break", "case",  "ceil", 
  |          "clamp", "continue", "const",  "cos", "cosh", "cot",  "csc", 
  |          "default",  "deg2grad", "deg2rad",  "equal", "erf",  "erfc", 
  |          "exp", "expm1", "false", "floor", "for", "frac", "grad2deg", 
  |          "hypot", "iclamp", "if",  "else", "ilike", "in",  "inrange", 
  |          "like",  "log",  "log10", "log2",  "logn",  "log1p", "mand", 
  |          "max", "min",  "mod", "mor",  "mul", "ncdf",  "nand", "nor", 
  |          "not",   "not_equal",   "null",   "or",   "pow",  "rad2deg", 
  |          "repeat", "return", "root", "round", "roundn", "sec", "sgn", 
  |          "shl", "shr", "sin", "sinc", "sinh", "sqrt", "sum",  "swap", 
  |          "switch", "tan",  "tanh", "true",  "trunc", "until",  "var", 
  |          "while", "xnor", "xor", "&", "|" 
  |       }; 
  |  
  |       static const std::size_t reserved_symbols_size = sizeof(reserved_symbols) / sizeof(std::string); 
  |  
  |       static const std::string base_function_list[] = 
  |       { 
  |          "abs", "acos",  "acosh", "asin",  "asinh", "atan",  "atanh", 
  |          "atan2",  "avg",  "ceil",  "clamp",  "cos",  "cosh",  "cot", 
  |          "csc",  "equal",  "erf",  "erfc",  "exp",  "expm1", "floor", 
  |          "frac", "hypot", "iclamp",  "like", "log", "log10",  "log2", 
  |          "logn", "log1p", "mand", "max", "min", "mod", "mor",  "mul", 
  |          "ncdf",  "pow",  "root",  "round",  "roundn",  "sec", "sgn", 
  |          "sin", "sinc", "sinh", "sqrt", "sum", "swap", "tan", "tanh", 
  |          "trunc",  "not_equal",  "inrange",  "deg2grad",   "deg2rad", 
  |          "rad2deg", "grad2deg" 
  |       }; 
  |  
  |       static const std::size_t base_function_list_size = sizeof(base_function_list) / sizeof(std::string); 
  |  
  |       static const std::string logic_ops_list[] = 
  |       { 
  |          "and", "nand", "nor", "not", "or",  "xnor", "xor", "&", "|" 
  |       }; 
  |  
  |       static const std::size_t logic_ops_list_size = sizeof(logic_ops_list) / sizeof(std::string); 
  |  
  |       static const std::string cntrl_struct_list[] = 
  |       { 
  |          "if", "switch", "for", "while", "repeat", "return" 
  |       }; 
  |  
  |       static const std::size_t cntrl_struct_list_size = sizeof(cntrl_struct_list) / sizeof(std::string); 
  |  
  |       static const std::string arithmetic_ops_list[] = 
  |       { 
  |          "+", "-", "*", "/", "%", "^" 
  |       }; 
  |  
  |       static const std::size_t arithmetic_ops_list_size = sizeof(arithmetic_ops_list) / sizeof(std::string); 
  |  
  |       static const std::string assignment_ops_list[] = 
  |       { 
  |          ":=", "+=", "-=", 
  |          "*=", "/=", "%=" 
  |       }; 
  |  
  |       static const std::size_t assignment_ops_list_size = sizeof(assignment_ops_list) / sizeof(std::string); 
  |  
  |       static const std::string inequality_ops_list[] = 
  |       { 
  |          "<",  "<=", "==", 
  |          "=",  "!=", "<>", 
  |          ">=",  ">" 
  |       }; 
  |  
  |       static const std::size_t inequality_ops_list_size = sizeof(inequality_ops_list) / sizeof(std::string); 
  |  
  |       inline bool is_reserved_word(const std::string& symbol) 
  |       { 
  |          for (std::size_t i = 0; i < reserved_words_size; ++i) 
  |          { 
  |             if (imatch(symbol, reserved_words[i])) 
  |             { 
  |                return true; 
  |             } 
  |          } 
  |  
  |          return false; 
  |       } 
  |  
  |       inline bool is_reserved_symbol(const std::string& symbol) 
  |       { 
  |          for (std::size_t i = 0; i < reserved_symbols_size; ++i) 
  |          { 
  |             if (imatch(symbol, reserved_symbols[i])) 
  |             { 
  |                return true; 
  |             } 
  |          } 
  |  
  |          return false; 
  |       } 
  |  
  |       inline bool is_base_function(const std::string& function_name) 
  |       { 
  |          for (std::size_t i = 0; i < base_function_list_size; ++i) 
  |          { 
  |             if (imatch(function_name, base_function_list[i])) 
  |             { 
  |                return true; 
  |             } 
  |          } 
  |  
  |          return false; 
  |       } 
  |  
  |       inline bool is_control_struct(const std::string& cntrl_strct) 
  |       { 
  |          for (std::size_t i = 0; i < cntrl_struct_list_size; ++i) 
  |          { 
  |             if (imatch(cntrl_strct, cntrl_struct_list[i])) 
  |             { 
  |                return true; 
  |             } 
  |          } 
  |  
  |          return false; 
  |       } 
  |  
  |       inline bool is_logic_opr(const std::string& lgc_opr) 
  |       { 
  |          for (std::size_t i = 0; i < logic_ops_list_size; ++i) 
  |          { 
  |             if (imatch(lgc_opr, logic_ops_list[i])) 
  |             { 
  |                return true; 
  |             } 
  |          } 
  |  
  |          return false; 
  |       } 
  |  
  |       struct cs_match 
  |       { 
  |          static inline bool cmp(const char_t c0, const char_t c1) 
  |          { 
  |             return (c0 == c1); 
  |          } 
  |       }; 
  |  
  |       struct cis_match 
  |       { 
  |          static inline bool cmp(const char_t c0, const char_t c1) 
  |          { 
  |             return (std::tolower(c0) == std::tolower(c1)); 
  |          } 
  |       }; 
  |  
  |       template <typename Iterator, typename Compare> 
  |       inline bool match_impl(const Iterator pattern_begin, 
  |                              const Iterator pattern_end  , 
  |                              const Iterator data_begin   , 
  |                              const Iterator data_end     , 
  |                              const typename std::iterator_traits<Iterator>::value_type& zero_or_more, 
  |                              const typename std::iterator_traits<Iterator>::value_type& exactly_one ) 
  |       { 
  |          typedef typename std::iterator_traits<Iterator>::value_type type; 
  |  
  |          const Iterator null_itr(0); 
  |  
  |          Iterator p_itr  = pattern_begin; 
  |          Iterator d_itr  = data_begin; 
  |          Iterator np_itr = null_itr; 
  |          Iterator nd_itr = null_itr; 
  |  
  |          for ( ; ; ) 
  |          { 
  |             if (p_itr != pattern_end) 
  |             { 
  |                const type c = *(p_itr); 
  |  
  |                if ((data_end != d_itr) && (Compare::cmp(c,*(d_itr)) || (exactly_one == c))) 
  |                { 
  |                   ++d_itr; 
  |                   ++p_itr; 
  |                   continue; 
  |                } 
  |                else if (zero_or_more == c) 
  |                { 
  |                   while ((pattern_end != p_itr) && (zero_or_more == *(p_itr))) 
  |                   { 
  |                      ++p_itr; 
  |                   } 
  |  
  |                   const type d = *(p_itr); 
  |  
  |                   while ((data_end != d_itr) && !(Compare::cmp(d,*(d_itr)) || (exactly_one == d))) 
  |                   { 
  |                      ++d_itr; 
  |                   } 
  |  
  |                   // set backtrack iterators 
  |                   np_itr = p_itr - 1; 
  |                   nd_itr = d_itr + 1; 
  |  
  |                   continue; 
  |                } 
  |             } 
  |             else if (data_end == d_itr) 
  |                break; 
  |  
  |             if ((data_end == d_itr) || (null_itr == nd_itr)) 
  |                 return false; 
  |  
  |             p_itr = np_itr; 
  |             d_itr = nd_itr; 
  |          } 
  |  
  |          return true; 
  |       } 
  |  
  |       inline bool wc_match(const std::string& wild_card, 
  |                            const std::string& str) 
  |       { 
  |          return match_impl<char_cptr,cs_match> 
  |                 ( 
  |                    wild_card.data(), 
  |                    wild_card.data() + wild_card.size(), 
  |                    str.data(), 
  |                    str.data() + str.size(), 
  |                    '*', '?' 
  |                 ); 
  |       } 
  |  
  |       inline bool wc_imatch(const std::string& wild_card, 
  |                             const std::string& str) 
  |       { 
  |          return match_impl<char_cptr,cis_match> 
  |                 ( 
  |                    wild_card.data(), 
  |                    wild_card.data() + wild_card.size(), 
  |                    str.data(), 
  |                    str.data() + str.size(), 
  |                    '*', '?' 
  |                 ); 
  |       } 
  |  
  |       inline bool sequence_match(const std::string& pattern, 
  |                                  const std::string& str, 
  |                                  std::size_t&       diff_index, 
  |                                  char_t&            diff_value) 
  |       { 
  |          if (str.empty()) 
  |          { 
  |             return ("Z" == pattern); 
  |          } 
  |          else if ('*' == pattern[0]) 
  |             return false; 
  |  
  |          typedef std::string::const_iterator itr_t; 
  |  
  |          itr_t p_itr = pattern.begin(); 
  |          itr_t s_itr = str    .begin(); 
  |  
  |          const itr_t p_end = pattern.end(); 
  |          const itr_t s_end = str    .end(); 
  |  
  |          while ((s_end != s_itr) && (p_end != p_itr)) 
  |          { 
  |             if ('*' == (*p_itr)) 
  |             { 
  |                const char_t target = static_cast<char_t>(std::toupper(*(p_itr - 1))); 
  |  
  |                if ('*' == target) 
  |                { 
  |                   diff_index = static_cast<std::size_t>(std::distance(str.begin(),s_itr)); 
  |                   diff_value = static_cast<char_t>(std::toupper(*p_itr)); 
  |  
  |                   return false; 
  |                } 
  |                else 
  |                   ++p_itr; 
  |  
  |                while (s_itr != s_end) 
  |                { 
  |                   if (target != std::toupper(*s_itr)) 
  |                      break; 
  |                   else 
  |                      ++s_itr; 
  |                } 
  |  
  |                continue; 
  |             } 
  |             else if ( 
  |                       ('?' != *p_itr) && 
  |                       std::toupper(*p_itr) != std::toupper(*s_itr) 
  |                     ) 
  |             { 
  |                diff_index = static_cast<std::size_t>(std::distance(str.begin(),s_itr)); 
  |                diff_value = static_cast<char_t>(std::toupper(*p_itr)); 
  |  
  |                return false; 
  |             } 
  |  
  |             ++p_itr; 
  |             ++s_itr; 
  |          } 
  |  
  |          return ( 
  |                   (s_end == s_itr) && 
  |                   ( 
  |                     (p_end ==  p_itr) || 
  |                     ('*'   == *p_itr) 
  |                   ) 
  |                 ); 
  |       } 
  |  
  |       template<typename T> 
  |       struct set_zero_value_impl 
  |       { 
  |          static inline void process(T* base_ptr, const std::size_t size) 
  |          { 
  |             const T zero = T(0); 
  |             for (std::size_t i = 0; i < size; ++i) 
  |             { 
  |                base_ptr[i] = zero; 
  |             } 
  |          } 
  |       }; 
  |  
  |       #define pod_set_zero_value(T)                                      \ 
  |       template <>                                                        \ 
  |       struct set_zero_value_impl<T>                                      \ 
  |       {                                                                  \ 
  |          static inline void process(T* base_ptr, const std::size_t size) \ 
  |          { std::memset(base_ptr, 0x00, size * sizeof(T)); }              \ 
  |       };                                                                 \ 
  |  
  |       pod_set_zero_value(float      ) 
  |       pod_set_zero_value(double     ) 
  |       pod_set_zero_value(long double) 
  |  
  |       #ifdef pod_set_zero_value 
  |       #undef pod_set_zero_value 
  |       #endif 
  |  
  |       template<typename T> 
  |       inline void set_zero_value(T* data, const std::size_t size) 
  |       { 
  |          set_zero_value_impl<T>::process(data,size); 
  |       } 
  |  
  |       template<typename T> 
  |       inline void set_zero_value(std::vector<T>& v) 
  |       { 
  |          set_zero_value(v.data(),v.size()); 
  |       } 
  |  
  |       static const double pow10[] = 
  |       { 
  |          1.0, 
  |          1.0E+001, 1.0E+002, 1.0E+003, 1.0E+004, 
  |          1.0E+005, 1.0E+006, 1.0E+007, 1.0E+008, 
  |          1.0E+009, 1.0E+010, 1.0E+011, 1.0E+012, 
  |          1.0E+013, 1.0E+014, 1.0E+015, 1.0E+016 
  |       }; 
  |  
  |       static const std::size_t pow10_size = sizeof(pow10) / sizeof(double); 
  |  
  |       namespace numeric 
  |       { 
  |          namespace constant 
  |          { 
  |             static const double e       =  2.71828182845904523536028747135266249775724709369996; 
  |             static const double pi      =  3.14159265358979323846264338327950288419716939937510; 
  |             static const double pi_2    =  1.57079632679489661923132169163975144209858469968755; 
  |             static const double pi_4    =  0.78539816339744830961566084581987572104929234984378; 
  |             static const double pi_180  =  0.01745329251994329576923690768488612713442871888542; 
  |             static const double _1_pi   =  0.31830988618379067153776752674502872406891929148091; 
  |             static const double _2_pi   =  0.63661977236758134307553505349005744813783858296183; 
  |             static const double _180_pi = 57.29577951308232087679815481410517033240547246656443; 
  |             static const double log2    =  0.69314718055994530941723212145817656807550013436026; 
  |             static const double sqrt2   =  1.41421356237309504880168872420969807856967187537695; 
  |          } 
  |  
  |          namespace details 
  |          { 
  |             struct unknown_type_tag { unknown_type_tag() {} }; 
  |             struct real_type_tag    { real_type_tag   () {} }; 
  |             struct int_type_tag     { int_type_tag    () {} }; 
  |  
  |             template <typename T> 
  |             struct number_type 
  |             { 
  |                typedef unknown_type_tag type; 
  |                number_type() {} 
  |             }; 
  |  
  |             #define exprtk_register_real_type_tag(T)          \ 
  |             template <> struct number_type<T>                 \ 
  |             { typedef real_type_tag type; number_type() {} }; \ 
  |  
  |             #define exprtk_register_int_type_tag(T)           \ 
  |             template <> struct number_type<T>                 \ 
  |             { typedef int_type_tag type; number_type() {} };  \ 
  |  
  |             exprtk_register_real_type_tag(float      ) 
  |             exprtk_register_real_type_tag(double     ) 
  |             exprtk_register_real_type_tag(long double) 
  |  
  |             exprtk_register_int_type_tag(short         ) 
  |             exprtk_register_int_type_tag(int           ) 
  |             exprtk_register_int_type_tag(_int64_t      ) 
  |             exprtk_register_int_type_tag(unsigned short) 
  |             exprtk_register_int_type_tag(unsigned int  ) 
  |             exprtk_register_int_type_tag(_uint64_t     ) 
  |  
  |             #undef exprtk_register_real_type_tag 
  |             #undef exprtk_register_int_type_tag 
  |  
  |             template <typename T> 
  |             struct epsilon_type {}; 
  |  
  |             #define exprtk_define_epsilon_type(Type, Epsilon)      \ 
  |             template <> struct epsilon_type<Type>                  \ 
  |             {                                                      \ 
  |                static inline Type value()                          \ 
  |                {                                                   \ 
  |                   const Type epsilon = static_cast<Type>(Epsilon); \ 
  |                   return epsilon;                                  \ 
  |                }                                                   \ 
  |             };                                                     \ 
  |  
  |             exprtk_define_epsilon_type(float      , 0.00000100000f) 
  |             exprtk_define_epsilon_type(double     , 0.000000000100) 
  |             exprtk_define_epsilon_type(long double, 0.000000000001) 
  |  
  |             #undef exprtk_define_epsilon_type 
  |  
  |             template <typename T> 
  |             inline bool is_nan_impl(const T v, real_type_tag) 
  |             { 
  |                return std::not_equal_to<T>()(v,v); 
  |             } 
  |  
  |             template <typename T> 
  |             inline int to_int32_impl(const T v, real_type_tag) 
  |             { 
  |                return static_cast<int>(v); 
  |             } 
  |  
  |             template <typename T> 
  |             inline _int64_t to_int64_impl(const T v, real_type_tag) 
  |             { 
  |                return static_cast<_int64_t>(v); 
  |             } 
  |  
  |             template <typename T> 
  |             inline _uint64_t to_uint64_impl(const T v, real_type_tag) 
  |             { 
  |                return static_cast<_uint64_t>(v); 
  |             } 
  |  
  |             template <typename T> 
  |             inline bool is_true_impl(const T v) 
  |             { 
  |                return std::not_equal_to<T>()(T(0),v); 
  |             } 
  |  
  |             template <typename T> 
  |             inline bool is_false_impl(const T v) 
  |             { 
  |                return std::equal_to<T>()(T(0),v); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T abs_impl(const T v, real_type_tag) 
  |             { 
  |                return ((v < T(0)) ? -v : v); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T min_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                return std::min<T>(v0,v1); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T max_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                return std::max<T>(v0,v1); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T equal_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                const T epsilon = epsilon_type<T>::value(); 
  |                return (abs_impl(v0 - v1,real_type_tag()) <= (std::max(T(1),std::max(abs_impl(v0,real_type_tag()),abs_impl(v1,real_type_tag()))) * epsilon)) ? T(1) : T(0); 
  |             } 
  |  
  |             inline float equal_impl(const float v0, const float v1, real_type_tag) 
  |             { 
  |                const float epsilon = epsilon_type<float>::value(); 
  |                return (abs_impl(v0 - v1,real_type_tag()) <= (std::max(1.0f,std::max(abs_impl(v0,real_type_tag()),abs_impl(v1,real_type_tag()))) * epsilon)) ? 1.0f : 0.0f; 
  |             } 
  |  
  |             template <typename T> 
  |             inline T equal_impl(const T v0, const T v1, int_type_tag) 
  |             { 
  |                return (v0 == v1) ? 1 : 0; 
  |             } 
  |  
  |             template <typename T> 
  |             inline T expm1_impl(const T v, real_type_tag) 
  |             { 
  |                // return std::expm1<T>(v); 
  |                if (abs_impl(v,real_type_tag()) < T(0.00001)) 
  |                   return v + (T(0.5) * v * v); 
  |                else 
  |                   return std::exp(v) - T(1); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T expm1_impl(const T v, int_type_tag) 
  |             { 
  |                return T(std::exp<double>(v)) - T(1); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T nequal_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                typedef real_type_tag rtg; 
  |                const T epsilon = epsilon_type<T>::value(); 
  |                return (abs_impl(v0 - v1,rtg()) > (std::max(T(1),std::max(abs_impl(v0,rtg()),abs_impl(v1,rtg()))) * epsilon)) ? T(1) : T(0); 
  |             } 
  |  
  |             inline float nequal_impl(const float v0, const float v1, real_type_tag) 
  |             { 
  |                typedef real_type_tag rtg; 
  |                const float epsilon = epsilon_type<float>::value(); 
  |                return (abs_impl(v0 - v1,rtg()) > (std::max(1.0f,std::max(abs_impl(v0,rtg()),abs_impl(v1,rtg()))) * epsilon)) ? 1.0f : 0.0f; 
  |             } 
  |  
  |             template <typename T> 
  |             inline T nequal_impl(const T v0, const T v1, int_type_tag) 
  |             { 
  |                return (v0 != v1) ? 1 : 0; 
  |             } 
  |  
  |             template <typename T> 
  |             inline T modulus_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                return std::fmod(v0,v1); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T modulus_impl(const T v0, const T v1, int_type_tag) 
  |             { 
  |                return v0 % v1; 
  |             } 
  |  
  |             template <typename T> 
  |             inline T pow_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                return std::pow(v0,v1); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T pow_impl(const T v0, const T v1, int_type_tag) 
  |             { 
  |                return std::pow(static_cast<double>(v0),static_cast<double>(v1)); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T logn_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                return std::log(v0) / std::log(v1); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T logn_impl(const T v0, const T v1, int_type_tag) 
  |             { 
  |                return static_cast<T>(logn_impl<double>(static_cast<double>(v0),static_cast<double>(v1),real_type_tag())); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T log1p_impl(const T v, real_type_tag) 
  |             { 
  |                if (v > T(-1)) 
  |                { 
  |                   if (abs_impl(v,real_type_tag()) > T(0.0001)) 
  |                   { 
  |                      return std::log(T(1) + v); 
  |                   } 
  |                   else 
  |                      return (T(-0.5) * v + T(1)) * v; 
  |                } 
  |  
  |                return std::numeric_limits<T>::quiet_NaN(); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T log1p_impl(const T v, int_type_tag) 
  |             { 
  |                if (v > T(-1)) 
  |                { 
  |                   return std::log(T(1) + v); 
  |                } 
  |  
  |                return std::numeric_limits<T>::quiet_NaN(); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T root_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                if (v0 < T(0)) 
  |                { 
  |                   return (v1 == std::trunc(v1)) && (modulus_impl(v1, T(2), real_type_tag()) != T(0)) ? 
  |                          -std::pow(abs_impl(v0, real_type_tag()), T(1) / v1) : 
  |                           std::numeric_limits<double>::quiet_NaN(); 
  |                } 
  |  
  |                return std::pow(v0, T(1) / v1); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T root_impl(const T v0, const T v1, int_type_tag) 
  |             { 
  |                return root_impl<double>(static_cast<double>(v0),static_cast<double>(v1),real_type_tag()); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T round_impl(const T v, real_type_tag) 
  |             { 
  |                return ((v < T(0)) ? std::ceil(v - T(0.5)) : std::floor(v + T(0.5))); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T roundn_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                const int index = std::max<int>(0, std::min<int>(pow10_size - 1, static_cast<int>(std::floor(v1)))); 
  |                const T p10 = T(pow10[index]); 
  |  
  |                if (v0 < T(0)) 
  |                   return T(std::ceil ((v0 * p10) - T(0.5)) / p10); 
  |                else 
  |                   return T(std::floor((v0 * p10) + T(0.5)) / p10); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T roundn_impl(const T v0, const T, int_type_tag) 
  |             { 
  |                return v0; 
  |             } 
  |  
  |             template <typename T> 
  |             inline T hypot_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                return std::sqrt((v0 * v0) + (v1 * v1)); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T hypot_impl(const T v0, const T v1, int_type_tag) 
  |             { 
  |                return static_cast<T>(std::sqrt(static_cast<double>((v0 * v0) + (v1 * v1)))); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T atan2_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                return std::atan2(v0,v1); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T atan2_impl(const T, const T, int_type_tag) 
  |             { 
  |                return 0; 
  |             } 
  |  
  |             template <typename T> 
  |             inline T shr_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                return v0 * (T(1) / std::pow(T(2),static_cast<T>(static_cast<int>(v1)))); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T shr_impl(const T v0, const T v1, int_type_tag) 
  |             { 
  |                return v0 >> v1; 
  |             } 
  |  
  |             template <typename T> 
  |             inline T shl_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                return v0 * std::pow(T(2),static_cast<T>(static_cast<int>(v1))); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T shl_impl(const T v0, const T v1, int_type_tag) 
  |             { 
  |                return v0 << v1; 
  |             } 
  |  
  |             template <typename T> 
  |             inline T sgn_impl(const T v, real_type_tag) 
  |             { 
  |                if      (v > T(0)) return T(+1); 
  |                else if (v < T(0)) return T(-1); 
  |                else               return T( 0); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T sgn_impl(const T v, int_type_tag) 
  |             { 
  |                if      (v > T(0)) return T(+1); 
  |                else if (v < T(0)) return T(-1); 
  |                else               return T( 0); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T and_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                return (is_true_impl(v0) && is_true_impl(v1)) ? T(1) : T(0); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T and_impl(const T v0, const T v1, int_type_tag) 
  |             { 
  |                return v0 && v1; 
  |             } 
  |  
  |             template <typename T> 
  |             inline T nand_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                return (is_false_impl(v0) || is_false_impl(v1)) ? T(1) : T(0); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T nand_impl(const T v0, const T v1, int_type_tag) 
  |             { 
  |                return !(v0 && v1); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T or_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                return (is_true_impl(v0) || is_true_impl(v1)) ? T(1) : T(0); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T or_impl(const T v0, const T v1, int_type_tag) 
  |             { 
  |                return (v0 || v1); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T nor_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                return (is_false_impl(v0) && is_false_impl(v1)) ? T(1) : T(0); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T nor_impl(const T v0, const T v1, int_type_tag) 
  |             { 
  |                return !(v0 || v1); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T xor_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                return (is_false_impl(v0) != is_false_impl(v1)) ? T(1) : T(0); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T xor_impl(const T v0, const T v1, int_type_tag) 
  |             { 
  |                return v0 ^ v1; 
  |             } 
  |  
  |             template <typename T> 
  |             inline T xnor_impl(const T v0, const T v1, real_type_tag) 
  |             { 
  |                const bool v0_true = is_true_impl(v0); 
  |                const bool v1_true = is_true_impl(v1); 
  |  
  |                if ((v0_true &&  v1_true) || (!v0_true && !v1_true)) 
  |                   return T(1); 
  |                else 
  |                   return T(0); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T xnor_impl(const T v0, const T v1, int_type_tag) 
  |             { 
  |                const bool v0_true = is_true_impl(v0); 
  |                const bool v1_true = is_true_impl(v1); 
  |  
  |                if ((v0_true &&  v1_true) || (!v0_true && !v1_true)) 
  |                   return T(1); 
  |                else 
  |                   return T(0); 
  |             } 
  |  
  |             #if (defined(_MSC_VER) && (_MSC_VER >= 1900)) || !defined(_MSC_VER) 
  |             #define exprtk_define_erf(TT, impl)                \ 
  |             inline TT erf_impl(const TT v) { return impl(v); } \ 
  |  
  |             exprtk_define_erf(float      , ::erff) 
  |             exprtk_define_erf(double     , ::erf ) 
  |             exprtk_define_erf(long double, ::erfl) 
  |             #undef exprtk_define_erf 
  |             #endif 
  |  
  |             template <typename T> 
  |             inline T erf_impl(const T v, real_type_tag) 
  |             { 
  |                #if defined(_MSC_VER) && (_MSC_VER < 1900) 
  |                // Credits: Abramowitz & Stegun Equations 7.1.25-28 
  |                static const T c[] = 
  |                { 
  |                   T( 1.26551223), T(1.00002368), 
  |                   T( 0.37409196), T(0.09678418), 
  |                   T(-0.18628806), T(0.27886807), 
  |                   T(-1.13520398), T(1.48851587), 
  |                   T(-0.82215223), T(0.17087277) 
  |                }; 
  |  
  |                const T t = T(1) / (T(1) + T(0.5) * abs_impl(v,real_type_tag())); 
  |  
  |                const T result = T(1) - t * std::exp((-v * v) - 
  |                                             c[0] + t * (c[1] + t * 
  |                                            (c[2] + t * (c[3] + t * 
  |                                            (c[4] + t * (c[5] + t * 
  |                                            (c[6] + t * (c[7] + t * 
  |                                            (c[8] + t * (c[9])))))))))); 
  |  
  |                return (v >= T(0)) ? result : -result; 
  |                #else 
  |                return erf_impl(v); 
  |                #endif 
  |             } 
  |  
  |             template <typename T> 
  |             inline T erf_impl(const T v, int_type_tag) 
  |             { 
  |                return erf_impl(static_cast<double>(v),real_type_tag()); 
  |             } 
  |  
  |             #if (defined(_MSC_VER) && (_MSC_VER >= 1900)) || !defined(_MSC_VER) 
  |             #define exprtk_define_erfc(TT, impl)                \ 
  |             inline TT erfc_impl(const TT v) { return impl(v); } \ 
  |  
  |             exprtk_define_erfc(float      ,::erfcf) 
  |             exprtk_define_erfc(double     ,::erfc ) 
  |             exprtk_define_erfc(long double,::erfcl) 
  |             #undef exprtk_define_erfc 
  |             #endif 
  |  
  |             template <typename T> 
  |             inline T erfc_impl(const T v, real_type_tag) 
  |             { 
  |                #if defined(_MSC_VER) && (_MSC_VER < 1900) 
  |                return T(1) - erf_impl(v,real_type_tag()); 
  |                #else 
  |                return erfc_impl(v); 
  |                #endif 
  |             } 
  |  
  |             template <typename T> 
  |             inline T erfc_impl(const T v, int_type_tag) 
  |             { 
  |                return erfc_impl(static_cast<double>(v),real_type_tag()); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T ncdf_impl(const T v, real_type_tag) 
  |             { 
  |                return T(0.5) * erfc_impl(-(v / T(numeric::constant::sqrt2)),real_type_tag()); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T ncdf_impl(const T v, int_type_tag) 
  |             { 
  |                return ncdf_impl(static_cast<double>(v),real_type_tag()); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T sinc_impl(const T v, real_type_tag) 
  |             { 
  |                if (std::abs(v) >= std::numeric_limits<T>::epsilon()) 
  |                    return(std::sin(v) / v); 
  |                else 
  |                   return T(1); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T sinc_impl(const T v, int_type_tag) 
  |             { 
  |                return sinc_impl(static_cast<double>(v),real_type_tag()); 
  |             } 
  |  
  |             #if __cplusplus >= 201103L 
  |             template <typename T> 
  |             inline T acosh_impl(const T v, real_type_tag) 
  |             { 
  |                return std::acosh(v); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T asinh_impl(const T v, real_type_tag) 
  |             { 
  |                return std::asinh(v); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T atanh_impl(const T v, real_type_tag) 
  |             { 
  |                return std::atanh(v); 
  |             } 
  |             #else 
  |             template <typename T> 
  |             inline T acosh_impl(const T v, real_type_tag) 
  |             { 
  |                return std::log(v + std::sqrt((v * v) - T(1))); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T asinh_impl(const T v, real_type_tag) 
  |             { 
  |                return std::log(v + std::sqrt((v * v) + T(1))); 
  |             } 
  |  
  |             template <typename T> 
  |             inline T atanh_impl(const T v, real_type_tag) 
  |             { 
  |                return (std::log(T(1) + v) - std::log(T(1) - v)) / T(2); 
  |             } 
  |             #endif 
  |  
  |             template <typename T> inline T  acos_impl(const T v, real_type_tag) { return std::acos (v); } 
  |             template <typename T> inline T  asin_impl(const T v, real_type_tag) { return std::asin (v); } 
  |             template <typename T> inline T  atan_impl(const T v, real_type_tag) { return std::atan (v); } 
  |             template <typename T> inline T  ceil_impl(const T v, real_type_tag) { return std::ceil (v); } 
  |             template <typename T> inline T   cos_impl(const T v, real_type_tag) { return std::cos  (v); } 
  |             template <typename T> inline T  cosh_impl(const T v, real_type_tag) { return std::cosh (v); } 
  |             template <typename T> inline T   exp_impl(const T v, real_type_tag) { return std::exp  (v); } 
  |             template <typename T> inline T floor_impl(const T v, real_type_tag) { return std::floor(v); } 
  |             template <typename T> inline T   log_impl(const T v, real_type_tag) { return std::log  (v); } 
  |             template <typename T> inline T log10_impl(const T v, real_type_tag) { return std::log10(v); } 
  |             template <typename T> inline T  log2_impl(const T v, real_type_tag) { return std::log(v)/T(numeric::constant::log2); } 
  |             template <typename T> inline T   neg_impl(const T v, real_type_tag) { return -v;            } 
  |             template <typename T> inline T   pos_impl(const T v, real_type_tag) { return +v;            } 
  |             template <typename T> inline T   sin_impl(const T v, real_type_tag) { return std::sin  (v); } 
  |             template <typename T> inline T  sinh_impl(const T v, real_type_tag) { return std::sinh (v); } 
  |             template <typename T> inline T  sqrt_impl(const T v, real_type_tag) { return std::sqrt (v); } 
  |             template <typename T> inline T   tan_impl(const T v, real_type_tag) { return std::tan  (v); } 
  |             template <typename T> inline T  tanh_impl(const T v, real_type_tag) { return std::tanh (v); } 
  |             template <typename T> inline T   cot_impl(const T v, real_type_tag) { return T(1) / std::tan(v); } 
  |             template <typename T> inline T   sec_impl(const T v, real_type_tag) { return T(1) / std::cos(v); } 
  |             template <typename T> inline T   csc_impl(const T v, real_type_tag) { return T(1) / std::sin(v); } 
  |             template <typename T> inline T   r2d_impl(const T v, real_type_tag) { return (v * T(numeric::constant::_180_pi)); } 
  |             template <typename T> inline T   d2r_impl(const T v, real_type_tag) { return (v * T(numeric::constant::pi_180));  } 
  |             template <typename T> inline T   d2g_impl(const T v, real_type_tag) { return (v * T(10.0/9.0)); } 
  |             template <typename T> inline T   g2d_impl(const T v, real_type_tag) { return (v * T(9.0/10.0)); } 
  |             template <typename T> inline T  notl_impl(const T v, real_type_tag) { return (std::not_equal_to<T>()(T(0),v) ? T(0) : T(1)); } 
  |             template <typename T> inline T  frac_impl(const T v, real_type_tag) { return (v - static_cast<long long>(v)); } 
  |             template <typename T> inline T trunc_impl(const T v, real_type_tag) { return T(static_cast<long long>(v));    } 
  |  
  |             template <typename T> inline T   const_pi_impl(real_type_tag) { return T(numeric::constant::pi);            } 
  |             template <typename T> inline T    const_e_impl(real_type_tag) { return T(numeric::constant::e);             } 
  |             template <typename T> inline T const_qnan_impl(real_type_tag) { return std::numeric_limits<T>::quiet_NaN(); } 
  |  
  |             template <typename T> inline T   abs_impl(const T v, int_type_tag) { return ((v >= T(0)) ? v : -v); } 
  |             template <typename T> inline T   exp_impl(const T v, int_type_tag) { return std::exp  (v); } 
  |             template <typename T> inline T   log_impl(const T v, int_type_tag) { return std::log  (v); } 
  |             template <typename T> inline T log10_impl(const T v, int_type_tag) { return std::log10(v); } 
  |             template <typename T> inline T  log2_impl(const T v, int_type_tag) { return std::log(v)/T(numeric::constant::log2); } 
  |             template <typename T> inline T   neg_impl(const T v, int_type_tag) { return -v;            } 
  |             template <typename T> inline T   pos_impl(const T v, int_type_tag) { return +v;            } 
  |             template <typename T> inline T  ceil_impl(const T v, int_type_tag) { return v;             } 
  |             template <typename T> inline T floor_impl(const T v, int_type_tag) { return v;             } 
  |             template <typename T> inline T round_impl(const T v, int_type_tag) { return v;             } 
  |             template <typename T> inline T  notl_impl(const T v, int_type_tag) { return !v;            } 
  |             template <typename T> inline T  sqrt_impl(const T v, int_type_tag) { return std::sqrt (v); } 
  |             template <typename T> inline T  frac_impl(const T  , int_type_tag) { return T(0);          } 
  |             template <typename T> inline T trunc_impl(const T v, int_type_tag) { return v;             } 
  |             template <typename T> inline T  acos_impl(const T  , int_type_tag) { return std::numeric_limits<T>::quiet_NaN(); } 
  |             template <typename T> inline T acosh_impl(const T  , int_type_tag) { return std::numeric_limits<T>::quiet_NaN(); } 
  |             template <typename T> inline T  asin_impl(const T  , int_type_tag) { return std::numeric_limits<T>::quiet_NaN(); } 
  |             template <typename T> inline T asinh_impl(const T  , int_type_tag) { return std::numeric_limits<T>::quiet_NaN(); } 
  |             template <typename T> inline T  atan_impl(const T  , int_type_tag) { return std::numeric_limits<T>::quiet_NaN(); } 
  |             template <typename T> inline T atanh_impl(const T  , int_type_tag) { return std::numeric_limits<T>::quiet_NaN(); } 
  |             template <typename T> inline T   cos_impl(const T  , int_type_tag) { return std::numeric_limits<T>::quiet_NaN(); } 
  |             template <typename T> inline T  cosh_impl(const T  , int_type_tag) { return std::numeric_limits<T>::quiet_NaN(); } 
  |             template <typename T> inline T   sin_impl(const T  , int_type_tag) { return std::numeric_limits<T>::quiet_NaN(); } 
  |             template <typename T> inline T  sinh_impl(const T  , int_type_tag) { return std::numeric_limits<T>::quiet_NaN(); } 
  |             template <typename T> inline T   tan_impl(const T  , int_type_tag) { return std::numeric_limits<T>::quiet_NaN(); } 
  |             template <typename T> inline T  tanh_impl(const T  , int_type_tag) { return std::numeric_limits<T>::quiet_NaN(); } 
  |             template <typename T> inline T   cot_impl(const T  , int_type_tag) { return std::numeric_limits<T>::quiet_NaN(); } 
  |             template <typename T> inline T   sec_impl(const T  , int_type_tag) { return std::numeric_limits<T>::quiet_NaN(); } 
  |             template <typename T> inline T   csc_impl(const T  , int_type_tag) { return std::numeric_limits<T>::quiet_NaN(); } 
  |  
  |             template <typename T> 
  |             inline bool is_integer_impl(const T& v, real_type_tag) 
  |             { 
  |                return std::equal_to<T>()(T(0),std::fmod(v,T(1))); 
  |             } 
  |  
  |             template <typename T> 
  |             inline bool is_integer_impl(const T&, int_type_tag) 
  |             { 
  |                return true; 
  |             } 
  |          } 
  |  
  |          template <typename Type> 
  |          struct numeric_info { enum { length = 0, size = 32, bound_length = 0, min_exp = 0, max_exp = 0 }; }; 
  |  
  |          template <> struct numeric_info<int        > { enum { length = 10, size = 16, bound_length = 9 }; }; 
  |          template <> struct numeric_info<float      > { enum { min_exp =  -38, max_exp =  +38 }; }; 
  |          template <> struct numeric_info<double     > { enum { min_exp = -308, max_exp = +308 }; }; 
  |          template <> struct numeric_info<long double> { enum { min_exp = -308, max_exp = +308 }; }; 
  |  
  |          template <typename T> 
  |          inline int to_int32(const T v) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return to_int32_impl(v, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline _int64_t to_int64(const T v) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return to_int64_impl(v, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline _uint64_t to_uint64(const T v) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return to_uint64_impl(v, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline bool is_nan(const T v) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return is_nan_impl(v, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T min(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return min_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T max(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return max_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T equal(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return equal_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T nequal(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return nequal_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T modulus(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return modulus_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T pow(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return pow_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T logn(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return logn_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T root(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return root_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T roundn(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return roundn_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T hypot(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return hypot_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T atan2(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return atan2_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T shr(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return shr_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T shl(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return shl_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T and_opr(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return and_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T nand_opr(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return nand_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T or_opr(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return or_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T nor_opr(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return nor_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T xor_opr(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return xor_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T xnor_opr(const T v0, const T v1) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return xnor_impl(v0, v1, num_type); 
  |          } 
  |  
  |          template <typename T> 
  |          inline bool is_integer(const T v) 
  |          { 
  |             const typename details::number_type<T>::type num_type; 
  |             return is_integer_impl(v, num_type); 
  |          } 
  |  
  |          template <typename T, unsigned int N> 
  |          struct fast_exp 
  |          { 
  |             static inline T result(T v) 
  |             { 
  |                unsigned int k = N; 
  |                T l = T(1); 
  |  
  |                while (k) 
  |                { 
  |                   if (1 == (k % 2)) 
  |                   { 
  |                      l *= v; 
  |                      --k; 
  |                   } 
  |  
  |                   v *= v; 
  |                   k /= 2; 
  |                } 
  |  
  |                return l; 
  |             } 
  |          }; 
  |  
  |          template <typename T> struct fast_exp<T,10> { static inline T result(const T v) { T v_5 = fast_exp<T,5>::result(v); return v_5 * v_5; } }; 
  |          template <typename T> struct fast_exp<T, 9> { static inline T result(const T v) { return fast_exp<T,8>::result(v) * v; } }; 
  |          template <typename T> struct fast_exp<T, 8> { static inline T result(const T v) { T v_4 = fast_exp<T,4>::result(v); return v_4 * v_4; } }; 
  |          template <typename T> struct fast_exp<T, 7> { static inline T result(const T v) { return fast_exp<T,6>::result(v) * v; } }; 
  |          template <typename T> struct fast_exp<T, 6> { static inline T result(const T v) { T v_3 = fast_exp<T,3>::result(v); return v_3 * v_3; } }; 
  |          template <typename T> struct fast_exp<T, 5> { static inline T result(const T v) { return fast_exp<T,4>::result(v) * v; } }; 
  |          template <typename T> struct fast_exp<T, 4> { static inline T result(const T v) { T v_2 = v * v; return v_2 * v_2; } }; 
  |          template <typename T> struct fast_exp<T, 3> { static inline T result(const T v) { return v * v * v; } }; 
  |          template <typename T> struct fast_exp<T, 2> { static inline T result(const T v) { return v * v;     } }; 
  |          template <typename T> struct fast_exp<T, 1> { static inline T result(const T v) { return v;         } }; 
  |          template <typename T> struct fast_exp<T, 0> { static inline T result(const T  ) { return T(1);      } }; 
  |  
  |          #define exprtk_define_unary_function(FunctionName)        \ 
  |          template <typename T>                                     \ 
  |          inline T FunctionName (const T v)                         \ 
  |          {                                                         \ 
  |             const typename details::number_type<T>::type num_type; \ 
  |             return  FunctionName##_impl(v,num_type);               \ 
  |          }                                                         \ 
  |  
  |          exprtk_define_unary_function(abs  ) 
  |          exprtk_define_unary_function(acos ) 
  |          exprtk_define_unary_function(acosh) 
  |          exprtk_define_unary_function(asin ) 
  |          exprtk_define_unary_function(asinh) 
  |          exprtk_define_unary_function(atan ) 
  |          exprtk_define_unary_function(atanh) 
  |          exprtk_define_unary_function(ceil ) 
  |          exprtk_define_unary_function(cos  ) 
  |          exprtk_define_unary_function(cosh ) 
  |          exprtk_define_unary_function(exp  ) 
  |          exprtk_define_unary_function(expm1) 
  |          exprtk_define_unary_function(floor) 
  |          exprtk_define_unary_function(log  ) 
  |          exprtk_define_unary_function(log10) 
  |          exprtk_define_unary_function(log2 ) 
  |          exprtk_define_unary_function(log1p) 
  |          exprtk_define_unary_function(neg  ) 
  |          exprtk_define_unary_function(pos  ) 
  |          exprtk_define_unary_function(round) 
  |          exprtk_define_unary_function(sin  ) 
  |          exprtk_define_unary_function(sinc ) 
  |          exprtk_define_unary_function(sinh ) 
  |          exprtk_define_unary_function(sqrt ) 
  |          exprtk_define_unary_function(tan  ) 
  |          exprtk_define_unary_function(tanh ) 
  |          exprtk_define_unary_function(cot  ) 
  |          exprtk_define_unary_function(sec  ) 
  |          exprtk_define_unary_function(csc  ) 
  |          exprtk_define_unary_function(r2d  ) 
  |          exprtk_define_unary_function(d2r  ) 
  |          exprtk_define_unary_function(d2g  ) 
  |          exprtk_define_unary_function(g2d  ) 
  |          exprtk_define_unary_function(notl ) 
  |          exprtk_define_unary_function(sgn  ) 
  |          exprtk_define_unary_function(erf  ) 
  |          exprtk_define_unary_function(erfc ) 
  |          exprtk_define_unary_function(ncdf ) 
  |          exprtk_define_unary_function(frac ) 
  |          exprtk_define_unary_function(trunc) 
  |          #undef exprtk_define_unary_function 
  |       } 
  |  
  |       template <typename T> 
  |       inline T compute_pow10(T d, const int exponent) 
  |       { 
  |          static const double fract10[] = 
  |          { 
  |             0.0, 
  |             1.0E+001, 1.0E+002, 1.0E+003, 1.0E+004, 1.0E+005, 1.0E+006, 1.0E+007, 1.0E+008, 1.0E+009, 1.0E+010, 
  |             1.0E+011, 1.0E+012, 1.0E+013, 1.0E+014, 1.0E+015, 1.0E+016, 1.0E+017, 1.0E+018, 1.0E+019, 1.0E+020, 
  |             1.0E+021, 1.0E+022, 1.0E+023, 1.0E+024, 1.0E+025, 1.0E+026, 1.0E+027, 1.0E+028, 1.0E+029, 1.0E+030, 
  |             1.0E+031, 1.0E+032, 1.0E+033, 1.0E+034, 1.0E+035, 1.0E+036, 1.0E+037, 1.0E+038, 1.0E+039, 1.0E+040, 
  |             1.0E+041, 1.0E+042, 1.0E+043, 1.0E+044, 1.0E+045, 1.0E+046, 1.0E+047, 1.0E+048, 1.0E+049, 1.0E+050, 
  |             1.0E+051, 1.0E+052, 1.0E+053, 1.0E+054, 1.0E+055, 1.0E+056, 1.0E+057, 1.0E+058, 1.0E+059, 1.0E+060, 
  |             1.0E+061, 1.0E+062, 1.0E+063, 1.0E+064, 1.0E+065, 1.0E+066, 1.0E+067, 1.0E+068, 1.0E+069, 1.0E+070, 
  |             1.0E+071, 1.0E+072, 1.0E+073, 1.0E+074, 1.0E+075, 1.0E+076, 1.0E+077, 1.0E+078, 1.0E+079, 1.0E+080, 
  |             1.0E+081, 1.0E+082, 1.0E+083, 1.0E+084, 1.0E+085, 1.0E+086, 1.0E+087, 1.0E+088, 1.0E+089, 1.0E+090, 
  |             1.0E+091, 1.0E+092, 1.0E+093, 1.0E+094, 1.0E+095, 1.0E+096, 1.0E+097, 1.0E+098, 1.0E+099, 1.0E+100, 
  |             1.0E+101, 1.0E+102, 1.0E+103, 1.0E+104, 1.0E+105, 1.0E+106, 1.0E+107, 1.0E+108, 1.0E+109, 1.0E+110, 
  |             1.0E+111, 1.0E+112, 1.0E+113, 1.0E+114, 1.0E+115, 1.0E+116, 1.0E+117, 1.0E+118, 1.0E+119, 1.0E+120, 
  |             1.0E+121, 1.0E+122, 1.0E+123, 1.0E+124, 1.0E+125, 1.0E+126, 1.0E+127, 1.0E+128, 1.0E+129, 1.0E+130, 
  |             1.0E+131, 1.0E+132, 1.0E+133, 1.0E+134, 1.0E+135, 1.0E+136, 1.0E+137, 1.0E+138, 1.0E+139, 1.0E+140, 
  |             1.0E+141, 1.0E+142, 1.0E+143, 1.0E+144, 1.0E+145, 1.0E+146, 1.0E+147, 1.0E+148, 1.0E+149, 1.0E+150, 
  |             1.0E+151, 1.0E+152, 1.0E+153, 1.0E+154, 1.0E+155, 1.0E+156, 1.0E+157, 1.0E+158, 1.0E+159, 1.0E+160, 
  |             1.0E+161, 1.0E+162, 1.0E+163, 1.0E+164, 1.0E+165, 1.0E+166, 1.0E+167, 1.0E+168, 1.0E+169, 1.0E+170, 
  |             1.0E+171, 1.0E+172, 1.0E+173, 1.0E+174, 1.0E+175, 1.0E+176, 1.0E+177, 1.0E+178, 1.0E+179, 1.0E+180, 
  |             1.0E+181, 1.0E+182, 1.0E+183, 1.0E+184, 1.0E+185, 1.0E+186, 1.0E+187, 1.0E+188, 1.0E+189, 1.0E+190, 
  |             1.0E+191, 1.0E+192, 1.0E+193, 1.0E+194, 1.0E+195, 1.0E+196, 1.0E+197, 1.0E+198, 1.0E+199, 1.0E+200, 
  |             1.0E+201, 1.0E+202, 1.0E+203, 1.0E+204, 1.0E+205, 1.0E+206, 1.0E+207, 1.0E+208, 1.0E+209, 1.0E+210, 
  |             1.0E+211, 1.0E+212, 1.0E+213, 1.0E+214, 1.0E+215, 1.0E+216, 1.0E+217, 1.0E+218, 1.0E+219, 1.0E+220, 
  |             1.0E+221, 1.0E+222, 1.0E+223, 1.0E+224, 1.0E+225, 1.0E+226, 1.0E+227, 1.0E+228, 1.0E+229, 1.0E+230, 
  |             1.0E+231, 1.0E+232, 1.0E+233, 1.0E+234, 1.0E+235, 1.0E+236, 1.0E+237, 1.0E+238, 1.0E+239, 1.0E+240, 
  |             1.0E+241, 1.0E+242, 1.0E+243, 1.0E+244, 1.0E+245, 1.0E+246, 1.0E+247, 1.0E+248, 1.0E+249, 1.0E+250, 
  |             1.0E+251, 1.0E+252, 1.0E+253, 1.0E+254, 1.0E+255, 1.0E+256, 1.0E+257, 1.0E+258, 1.0E+259, 1.0E+260, 
  |             1.0E+261, 1.0E+262, 1.0E+263, 1.0E+264, 1.0E+265, 1.0E+266, 1.0E+267, 1.0E+268, 1.0E+269, 1.0E+270, 
  |             1.0E+271, 1.0E+272, 1.0E+273, 1.0E+274, 1.0E+275, 1.0E+276, 1.0E+277, 1.0E+278, 1.0E+279, 1.0E+280, 
  |             1.0E+281, 1.0E+282, 1.0E+283, 1.0E+284, 1.0E+285, 1.0E+286, 1.0E+287, 1.0E+288, 1.0E+289, 1.0E+290, 
  |             1.0E+291, 1.0E+292, 1.0E+293, 1.0E+294, 1.0E+295, 1.0E+296, 1.0E+297, 1.0E+298, 1.0E+299, 1.0E+300, 
  |             1.0E+301, 1.0E+302, 1.0E+303, 1.0E+304, 1.0E+305, 1.0E+306, 1.0E+307, 1.0E+308 
  |          }; 
  |  
  |          static const int fract10_size = static_cast<int>(sizeof(fract10) / sizeof(double)); 
  |  
  |          const int e = std::abs(exponent); 
  |  
  |          if (exponent >= std::numeric_limits<T>::min_exponent10) 
  |          { 
  |             if (e < fract10_size) 
  |             { 
  |                if (exponent > 0) 
  |                   return T(d * fract10[e]); 
  |                else 
  |                   return T(d / fract10[e]); 
  |             } 
  |             else 
  |                return T(d * std::pow(10.0, 10.0 * exponent)); 
  |          } 
  |          else 
  |          { 
  |                      d /= T(fract10[           -std::numeric_limits<T>::min_exponent10]); 
  |             return T(d /    fract10[-exponent + std::numeric_limits<T>::min_exponent10]); 
  |          } 
  |       } 
  |  
  |       template <typename Iterator, typename T> 
  |       inline bool string_to_type_converter_impl_ref(Iterator& itr, const Iterator end, T& result) 
  |       { 
  |          if (itr == end) 
  |             return false; 
  |  
  |          const bool negative = ('-' == (*itr)); 
  |  
  |          if (negative || ('+' == (*itr))) 
  |          { 
  |             if (end == ++itr) 
  |                return false; 
  |          } 
  |  
  |          static const uchar_t zero = static_cast<uchar_t>('0'); 
  |  
  |          while ((end != itr) && (zero == (*itr))) ++itr; 
  |  
  |          bool return_result = true; 
  |          unsigned int digit = 0; 
  |          const std::size_t length = static_cast<std::size_t>(std::distance(itr,end)); 
  |  
  |          if (length <= 4) 
  |          { 
  |             switch (length) 
  |             { 
  |                #ifdef exprtk_use_lut 
  |  
  |                #define exprtk_process_digit                          \ 
  |                if ((digit = details::digit_table[(int)*itr++]) < 10) \ 
  |                   result = result * 10 + (digit);                    \ 
  |                else                                                  \ 
  |                {                                                     \ 
  |                   return_result = false;                             \ 
  |                   break;                                             \ 
  |                }                                                     \ 
  |                exprtk_fallthrough                                    \ 
  |  
  |                #else 
  |  
  |                #define exprtk_process_digit        \ 
  |                if ((digit = (*itr++ - zero)) < 10) \ 
  |                   result = result * T(10) + digit; \ 
  |                else                                \ 
  |                {                                   \ 
  |                   return_result = false;           \ 
  |                   break;                           \ 
  |                }                                   \ 
  |                exprtk_fallthrough                  \ 
  |  
  |                #endif 
  |  
  |                case 4 : exprtk_process_digit 
  |                case 3 : exprtk_process_digit 
  |                case 2 : exprtk_process_digit 
  |                case 1 : if ((digit = (*itr - zero))>= 10) 
  |                         { 
  |                            digit = 0; 
  |                            return_result = false; 
  |                         } 
  |  
  |                #undef exprtk_process_digit 
  |             } 
  |          } 
  |          else 
  |             return_result = false; 
  |  
  |          if (length && return_result) 
  |          { 
  |             result = result * 10 + static_cast<T>(digit); 
  |             ++itr; 
  |          } 
  |  
  |          result = negative ? -result : result; 
  |          return return_result; 
  |       } 
  |  
  |       template <typename Iterator, typename T> 
  |       static inline bool parse_nan(Iterator& itr, const Iterator end, T& t) 
  |       { 
  |          typedef typename std::iterator_traits<Iterator>::value_type type; 
  |  
  |          static const std::size_t nan_length = 3; 
  |  
  |          if (std::distance(itr,end) != static_cast<int>(nan_length)) 
  |             return false; 
  |  
  |          if (static_cast<type>('n') == (*itr)) 
  |          { 
  |             if ( 
  |                  (static_cast<type>('a') != *(itr + 1)) || 
  |                  (static_cast<type>('n') != *(itr + 2)) 
  |                ) 
  |             { 
  |                return false; 
  |             } 
  |          } 
  |          else if ( 
  |                    (static_cast<type>('A') != *(itr + 1)) || 
  |                    (static_cast<type>('N') != *(itr + 2)) 
  |                  ) 
  |          { 
  |             return false; 
  |          } 
  |  
  |          t = std::numeric_limits<T>::quiet_NaN(); 
  |  
  |          return true; 
  |       } 
  |  
  |       template <typename Iterator, typename T> 
  |       static inline bool parse_inf(Iterator& itr, const Iterator end, T& t, const bool negative) 
  |       { 
  |          static const char_t inf_uc[] = "INFINITY" 
  |          static const char_t inf_lc[] = "infinity" 
  |          static const std::size_t inf_length = 8; 
  |  
  |          const std::size_t length = static_cast<std::size_t>(std::distance(itr,end)); 
  |  
  |          if ((3 != length) && (inf_length != length)) 
  |             return false; 
  |  
  |          char_cptr inf_itr = ('i' == (*itr)) ? inf_lc : inf_uc; 
  |  
  |          while (end != itr) 
  |          { 
  |             if (*inf_itr == static_cast<char_t>(*itr)) 
  |             { 
  |                ++itr; 
  |                ++inf_itr; 
  |                continue; 
  |             } 
  |             else 
  |                return false; 
  |          } 
  |  
  |          if (negative) 
  |             t = -std::numeric_limits<T>::infinity(); 
  |          else 
  |             t =  std::numeric_limits<T>::infinity(); 
  |  
  |          return true; 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool valid_exponent(const int exponent, numeric::details::real_type_tag) 
  |       { 
  |          using namespace details::numeric; 
  |          return (numeric_info<T>::min_exp <= exponent) && (exponent <= numeric_info<T>::max_exp); 
  |       } 
  |  
  |       template <typename Iterator, typename T> 
  |       inline bool string_to_real(Iterator& itr_external, const Iterator end, T& t, numeric::details::real_type_tag) 
  |       { 
  |          if (end == itr_external) return false; 
  |  
  |          Iterator itr = itr_external; 
  |  
  |          T d = T(0); 
  |  
  |          const bool negative = ('-' == (*itr)); 
  |  
  |          if (negative || '+' == (*itr)) 
  |          { 
  |             if (end == ++itr) 
  |                return false; 
  |          } 
  |  
  |          bool instate = false; 
  |  
  |          static const char_t zero = static_cast<uchar_t>('0'); 
  |  
  |          #define parse_digit_1(d)          \ 
  |          if ((digit = (*itr - zero)) < 10) \ 
  |             { d = d * T(10) + digit; }     \ 
  |          else                              \ 
  |             { break; }                     \ 
  |          if (end == ++itr) break;          \ 
  |  
  |          #define parse_digit_2(d)          \ 
  |          if ((digit = (*itr - zero)) < 10) \ 
  |             { d = d * T(10) + digit; }     \ 
  |          else                              \ 
  |             { break; }                     \ 
  |             ++itr;                         \ 
  |  
  |          if ('.' != (*itr)) 
  |          { 
  |             const Iterator curr = itr; 
  |  
  |             while ((end != itr) && (zero == (*itr))) ++itr; 
  |  
  |             while (end != itr) 
  |             { 
  |                unsigned int digit; 
  |                parse_digit_1(d) 
  |                parse_digit_1(d) 
  |                parse_digit_2(d) 
  |             } 
  |  
  |             if (curr != itr) instate = true; 
  |          } 
  |  
  |          int exponent = 0; 
  |  
  |          if (end != itr) 
  |          { 
  |             if ('.' == (*itr)) 
  |             { 
  |                const Iterator curr = ++itr; 
  |                T tmp_d = T(0); 
  |  
  |                while (end != itr) 
  |                { 
  |                   unsigned int digit; 
  |                   parse_digit_1(tmp_d) 
  |                   parse_digit_1(tmp_d) 
  |                   parse_digit_2(tmp_d) 
  |                } 
  |  
  |                if (curr != itr) 
  |                { 
  |                   instate = true; 
  |  
  |                   const int frac_exponent = static_cast<int>(-std::distance(curr, itr)); 
  |  
  |                   if (!valid_exponent<T>(frac_exponent, numeric::details::real_type_tag())) 
  |                      return false; 
  |  
  |                   d += compute_pow10(tmp_d, frac_exponent); 
  |                } 
  |  
  |                #undef parse_digit_1 
  |                #undef parse_digit_2 
  |             } 
  |  
  |             if (end != itr) 
  |             { 
  |                typename std::iterator_traits<Iterator>::value_type c = (*itr); 
  |  
  |                if (('e' == c) || ('E' == c)) 
  |                { 
  |                   int exp = 0; 
  |  
  |                   if (!details::string_to_type_converter_impl_ref(++itr, end, exp)) 
  |                   { 
  |                      if (end == itr) 
  |                         return false; 
  |                      else 
  |                         c = (*itr); 
  |                   } 
  |  
  |                   exponent += exp; 
  |                } 
  |  
  |                if (end != itr) 
  |                { 
  |                   if (('f' == c) || ('F' == c) || ('l' == c) || ('L' == c)) 
  |                      ++itr; 
  |                   else if ('#' == c) 
  |                   { 
  |                      if (end == ++itr) 
  |                         return false; 
  |                      else if (('I' <= (*itr)) && ((*itr) <= 'n')) 
  |                      { 
  |                         if (('i' == (*itr)) || ('I' == (*itr))) 
  |                         { 
  |                            return parse_inf(itr, end, t, negative); 
  |                         } 
  |                         else if (('n' == (*itr)) || ('N' == (*itr))) 
  |                         { 
  |                            return parse_nan(itr, end, t); 
  |                         } 
  |                         else 
  |                            return false; 
  |                      } 
  |                      else 
  |                         return false; 
  |                   } 
  |                   else if (('I' <= (*itr)) && ((*itr) <= 'n')) 
  |                   { 
  |                      if (('i' == (*itr)) || ('I' == (*itr))) 
  |                      { 
  |                         return parse_inf(itr, end, t, negative); 
  |                      } 
  |                      else if (('n' == (*itr)) || ('N' == (*itr))) 
  |                      { 
  |                         return parse_nan(itr, end, t); 
  |                      } 
  |                      else 
  |                         return false; 
  |                   } 
  |                   else 
  |                      return false; 
  |                } 
  |             } 
  |          } 
  |  
  |          if ((end != itr) || (!instate)) 
  |             return false; 
  |          else if (!valid_exponent<T>(exponent, numeric::details::real_type_tag())) 
  |             return false; 
  |          else if (exponent) 
  |             d = compute_pow10(d,exponent); 
  |  
  |          t = static_cast<T>((negative) ? -d : d); 
  |          return true; 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool string_to_real(const std::string& s, T& t) 
  |       { 
  |          const typename numeric::details::number_type<T>::type num_type; 
  |  
  |          char_cptr begin = s.data(); 
  |          char_cptr end   = s.data() + s.size(); 
  |  
  |          return string_to_real(begin, end, t, num_type); 
  |       } 
  |  
  |       template <typename T> 
  |       struct functor_t 
  |       { 
  |          /* 
  |             Note: The following definitions for Type, may require tweaking 
  |                   based on the compiler and target architecture. The benchmark 
  |                   should provide enough information to make the right choice. 
  |          */ 
  |          //typedef T Type; 
  |          //typedef const T Type; 
  |          typedef const T& Type; 
  |          typedef       T& RefType; 
  |          typedef T (*qfunc_t)(Type t0, Type t1, Type t2, Type t3); 
  |          typedef T (*tfunc_t)(Type t0, Type t1, Type t2); 
  |          typedef T (*bfunc_t)(Type t0, Type t1); 
  |          typedef T (*ufunc_t)(Type t0); 
  |       }; 
  |  
  |    } // namespace details 
  |  
  |    struct loop_runtime_check 
  |    { 
  |       enum loop_types 
  |       { 
  |          e_invalid           = 0, 
  |          e_for_loop          = 1, 
  |          e_while_loop        = 2, 
  |          e_repeat_until_loop = 4, 
  |          e_all_loops         = 7 
  |       }; 
  |  
  |       enum violation_type 
  |       { 
  |           e_unknown         = 0, 
  |           e_iteration_count = 1, 
  |           e_timeout         = 2 
  |       }; 
  |  
  |       loop_types loop_set; 
  |  
  |       loop_runtime_check() 
  |       : loop_set(e_invalid) 
  |       , max_loop_iterations(0) 
  |       {} 
  |  
  |       details::_uint64_t max_loop_iterations; 
  |  
  |       struct violation_context 
  |       { 
  |          loop_types loop; 
  |          violation_type violation; 
  |          details::_uint64_t iteration_count; 
  |       }; 
  |  
  |       virtual bool check() 
  |       { 
  |          return true; 
  |       } 
  |  
  |       virtual void handle_runtime_violation(const violation_context&) 
  |       { 
  |          throw std::runtime_error("ExprTk Loop runtime violation."); 
  |       } 
  |  
  |       virtual ~loop_runtime_check() 
  |       {} 
  |    }; 
  |  
  |    typedef loop_runtime_check* loop_runtime_check_ptr; 
  |  
  |    struct vector_access_runtime_check 
  |    { 
  |       struct violation_context 
  |       { 
  |          void* base_ptr; 
  |          void* end_ptr; 
  |          void* access_ptr; 
  |          std::size_t type_size; 
  |       }; 
  |  
  |       virtual ~vector_access_runtime_check() 
  |       {} 
  |  
  |       virtual bool handle_runtime_violation(violation_context& /*context*/) 
  |       { 
  |          throw std::runtime_error("ExprTk runtime vector access violation."); 
  |          #if !defined(_MSC_VER) && !defined(__NVCOMPILER) 
  |          return false; 
  |          #endif 
  |       } 
  |    }; 
  |  
  |    typedef vector_access_runtime_check* vector_access_runtime_check_ptr; 
  |  
  |    struct assert_check 
  |    { 
  |       struct assert_context 
  |       { 
  |          std::string condition; 
  |          std::string message; 
  |          std::string id; 
  |          std::size_t offet; 
  |       }; 
  |  
  |       virtual ~assert_check() 
  |       {} 
  |  
  |       virtual void handle_assert(const assert_context& /*context*/) 
  |       { 
  |       } 
  |    }; 
  |  
  |    typedef assert_check* assert_check_ptr; 
  |  
  |    struct compilation_check 
  |    { 
  |       struct compilation_context 
  |       { 
  |          std::string error_message; 
  |       }; 
  |  
  |       virtual bool continue_compilation(compilation_context& /*context*/) = 0; 
  |  
  |       virtual ~compilation_check() 
  |       {} 
  |    }; 
  |  
  |    typedef compilation_check* compilation_check_ptr; 
  |  
  |    namespace lexer 
  |    { 
  |       struct token 
  |       { 
  |          enum token_type 
  |          { 
  |             e_none        =   0, e_error       =   1, e_err_symbol  =   2, 
  |             e_err_number  =   3, e_err_string  =   4, e_err_sfunc   =   5, 
  |             e_eof         =   6, e_number      =   7, e_symbol      =   8, 
  |             e_string      =   9, e_assign      =  10, e_addass      =  11, 
  |             e_subass      =  12, e_mulass      =  13, e_divass      =  14, 
  |             e_modass      =  15, e_shr         =  16, e_shl         =  17, 
  |             e_lte         =  18, e_ne          =  19, e_gte         =  20, 
  |             e_swap        =  21, e_lt          = '<', e_gt          = '>', 
  |             e_eq          = '=', e_rbracket    = ')', e_lbracket    = '(', 
  |             e_rsqrbracket = ']', e_lsqrbracket = '[', e_rcrlbracket = '}', 
  |             e_lcrlbracket = '{', e_comma       = ',', e_add         = '+', 
  |             e_sub         = '-', e_div         = '/', e_mul         = '*', 
  |             e_mod         = '%', e_pow         = '^', e_colon       = ':', 
  |             e_ternary     = '?' 
  |          }; 
  |  
  |          token() 
  |          : type(e_none) 
  |          , value("") 
  |          , position(std::numeric_limits<std::size_t>::max()) 
  |          {} 
  |  
  |          void clear() 
  |          { 
  |             type     = e_none; 
  |             value    = "" 
  |             position = std::numeric_limits<std::size_t>::max(); 
  |          } 
  |  
  |          template <typename Iterator> 
  |          inline token& set_operator(const token_type tt, 
  |                                     const Iterator begin, const Iterator end, 
  |                                     const Iterator base_begin = Iterator(0)) 
  |          { 
  |             type = tt; 
  |             value.assign(begin,end); 
  |             if (base_begin) 
  |                position = static_cast<std::size_t>(std::distance(base_begin,begin)); 
  |             return (*this); 
  |          } 
  |  
  |          template <typename Iterator> 
  |          inline token& set_symbol(const Iterator begin, const Iterator end, const Iterator base_begin = Iterator(0)) 
  |          { 
  |             type = e_symbol; 
  |             value.assign(begin,end); 
  |             if (base_begin) 
  |                position = static_cast<std::size_t>(std::distance(base_begin,begin)); 
  |             return (*this); 
  |          } 
  |  
  |          template <typename Iterator> 
  |          inline token& set_numeric(const Iterator begin, const Iterator end, const Iterator base_begin = Iterator(0)) 
  |          { 
  |             type = e_number; 
  |             value.assign(begin,end); 
  |             if (base_begin) 
  |                position = static_cast<std::size_t>(std::distance(base_begin,begin)); 
  |             return (*this); 
  |          } 
  |  
  |          template <typename Iterator> 
  |          inline token& set_string(const Iterator begin, const Iterator end, const Iterator base_begin = Iterator(0)) 
  |          { 
  |             type = e_string; 
  |             value.assign(begin,end); 
  |             if (base_begin) 
  |                position = static_cast<std::size_t>(std::distance(base_begin,begin)); 
  |             return (*this); 
  |          } 
  |  
  |          inline token& set_string(const std::string& s, const std::size_t p) 
  |          { 
  |             type     = e_string; 
  |             value    = s; 
  |             position = p; 
  |             return (*this); 
  |          } 
  |  
  |          template <typename Iterator> 
  |          inline token& set_error(const token_type et, 
  |                                  const Iterator begin, const Iterator end, 
  |                                  const Iterator base_begin = Iterator(0)) 
  |          { 
  |             if ( 
  |                  (e_error      == et) || 
  |                  (e_err_symbol == et) || 
  |                  (e_err_number == et) || 
  |                  (e_err_string == et) || 
  |                  (e_err_sfunc  == et) 
  |                ) 
  |             { 
  |                type = et; 
  |             } 
  |             else 
  |                type = e_error; 
  |  
  |             value.assign(begin,end); 
  |  
  |             if (base_begin) 
  |                position = static_cast<std::size_t>(std::distance(base_begin,begin)); 
  |  
  |             return (*this); 
  |          } 
  |  
  |          static inline std::string to_str(token_type t) 
  |          { 
  |             switch (t) 
  |             { 
  |                case e_none        : return "NONE" 
  |                case e_error       : return "ERROR" 
  |                case e_err_symbol  : return "ERROR_SYMBOL" 
  |                case e_err_number  : return "ERROR_NUMBER" 
  |                case e_err_string  : return "ERROR_STRING" 
  |                case e_eof         : return "EOF" 
  |                case e_number      : return "NUMBER" 
  |                case e_symbol      : return "SYMBOL" 
  |                case e_string      : return "STRING" 
  |                case e_assign      : return ":=" 
  |                case e_addass      : return "+=" 
  |                case e_subass      : return "-=" 
  |                case e_mulass      : return "*=" 
  |                case e_divass      : return "/=" 
  |                case e_modass      : return "%=" 
  |                case e_shr         : return ">>" 
  |                case e_shl         : return "<<" 
  |                case e_lte         : return "<=" 
  |                case e_ne          : return "!=" 
  |                case e_gte         : return ">=" 
  |                case e_lt          : return "<" 
  |                case e_gt          : return ">" 
  |                case e_eq          : return "=" 
  |                case e_rbracket    : return ")" 
  |                case e_lbracket    : return "(" 
  |                case e_rsqrbracket : return "]" 
  |                case e_lsqrbracket : return "[" 
  |                case e_rcrlbracket : return "}" 
  |                case e_lcrlbracket : return "{" 
  |                case e_comma       : return "," 
  |                case e_add         : return "+" 
  |                case e_sub         : return "-" 
  |                case e_div         : return "/" 
  |                case e_mul         : return "*" 
  |                case e_mod         : return "%" 
  |                case e_pow         : return "^" 
  |                case e_colon       : return ":" 
  |                case e_ternary     : return "?" 
  |                case e_swap        : return "<=>" 
  |                default            : return "UNKNOWN" 
  |             } 
  |          } 
  |  
  |          static inline std::string seperator_to_str(const token_type t) 
  |          { 
  |             switch (t) 
  |             { 
  |                case e_comma : return "," 
  |                case e_colon : return ":" 
  |                case e_eof   : return "" 
  |                default      : return "UNKNOWN" 
  |             } 
  |  
  |             #if !defined(_MSC_VER) && !defined(__NVCOMPILER) 
  |             return "UNKNOWN" 
  |             #endif 
  |          } 
  |  
  |          inline bool is_error() const 
  |          { 
  |             return ( 
  |                      (e_error      == type) || 
  |                      (e_err_symbol == type) || 
  |                      (e_err_number == type) || 
  |                      (e_err_string == type) || 
  |                      (e_err_sfunc  == type) 
  |                    ); 
  |          } 
  |  
  |          token_type type; 
  |          std::string value; 
  |          std::size_t position; 
  |       }; 
  |  
  |       class generator 
  |       { 
  |       public: 
  |  
  |          typedef token token_t; 
  |          typedef std::vector<token_t> token_list_t; 
  |          typedef token_list_t::iterator token_list_itr_t; 
  |          typedef details::char_t char_t; 
  |  
  |          generator() 
  |          : base_itr_(0) 
  |          , s_itr_   (0) 
  |          , s_end_   (0) 
  |          { 
  |             clear(); 
  |          } 
  |  
  |          inline void clear() 
  |          { 
  |             base_itr_ = 0; 
  |             s_itr_    = 0; 
  |             s_end_    = 0; 
  |             token_list_.clear(); 
  |             token_itr_ = token_list_.end(); 
  |             store_token_itr_ = token_list_.end(); 
  |          } 
  |  
  |          inline bool process(const std::string& str) 
  |          { 
  |             base_itr_ = str.data(); 
  |             s_itr_    = str.data(); 
  |             s_end_    = str.data() + str.size(); 
  |  
  |             eof_token_.set_operator(token_t::e_eof, s_end_, s_end_, base_itr_); 
  |             token_list_.clear(); 
  |  
  |             while (!is_end(s_itr_)) 
  |             { 
  |                scan_token(); 
  |  
  |                if (!token_list_.empty() && token_list_.back().is_error()) 
  |                   return false; 
  |             } 
  |  
  |             return true; 
  |          } 
  |  
  |          inline bool empty() const 
  |          { 
  |             return token_list_.empty(); 
  |          } 
  |  
  |          inline std::size_t size() const 
  |          { 
  |             return token_list_.size(); 
  |          } 
  |  
  |          inline void begin() 
  |          { 
  |             token_itr_ = token_list_.begin(); 
  |             store_token_itr_ = token_list_.begin(); 
  |          } 
  |  
  |          inline void store() 
  |          { 
  |             store_token_itr_ = token_itr_; 
  |          } 
  |  
  |          inline void restore() 
  |          { 
  |             token_itr_ = store_token_itr_; 
  |          } 
  |  
  |          inline token_t& next_token() 
  |          { 
  |             if (token_list_.end() != token_itr_) 
  |             { 
  |                return *token_itr_++; 
  |             } 
  |             else 
  |                return eof_token_; 
  |          } 
  |  
  |          inline token_t& peek_next_token() 
  |          { 
  |             if (token_list_.end() != token_itr_) 
  |             { 
  |                return *token_itr_; 
  |             } 
  |             else 
  |                return eof_token_; 
  |          } 
  |  
  |          inline token_t& operator[](const std::size_t& index) 
  |          { 
  |             if (index < token_list_.size()) 
  |             { 
  |                return token_list_[index]; 
  |             } 
  |             else 
  |                return eof_token_; 
  |          } 
  |  
  |          inline token_t operator[](const std::size_t& index) const 
  |          { 
  |             if (index < token_list_.size()) 
  |             { 
  |                return token_list_[index]; 
  |             } 
  |             else 
  |                return eof_token_; 
  |          } 
  |  
  |          inline bool finished() const 
  |          { 
  |             return (token_list_.end() == token_itr_); 
  |          } 
  |  
  |          inline void insert_front(token_t::token_type tk_type) 
  |          { 
  |             if ( 
  |                  !token_list_.empty() && 
  |                  (token_list_.end() != token_itr_) 
  |                ) 
  |             { 
  |                token_t t = *token_itr_; 
  |  
  |                t.type     = tk_type; 
  |                token_itr_ = token_list_.insert(token_itr_,t); 
  |             } 
  |          } 
  |  
  |          inline std::string substr(const std::size_t& begin, const std::size_t& end) const 
  |          { 
  |             const details::char_cptr begin_itr = ((base_itr_ + begin) < s_end_) ? (base_itr_ + begin) : s_end_; 
  |             const details::char_cptr end_itr   = ((base_itr_ + end  ) < s_end_) ? (base_itr_ + end  ) : s_end_; 
  |  
  |             return std::string(begin_itr,end_itr); 
  |          } 
  |  
  |          inline std::string remaining() const 
  |          { 
  |             if (finished()) 
  |                return "" 
  |             else if (token_list_.begin() != token_itr_) 
  |                return std::string(base_itr_ + (token_itr_ - 1)->position, s_end_); 
  |             else 
  |                return std::string(base_itr_ + token_itr_->position, s_end_); 
  |          } 
  |  
  |       private: 
  |  
  |          inline bool is_end(details::char_cptr itr) const 
  |          { 
  |             return (s_end_ == itr); 
  |          } 
  |  
  |          #ifndef exprtk_disable_comments 
  |          inline bool is_comment_start(details::char_cptr itr) const 
  |          { 
  |             const char_t c0 = *(itr + 0); 
  |             const char_t c1 = *(itr + 1); 
  |  
  |             if ('#' == c0) 
  |                return true; 
  |             else if (!is_end(itr + 1)) 
  |             { 
  |                if (('/' == c0) && ('/' == c1)) return true; 
  |                if (('/' == c0) && ('*' == c1)) return true; 
  |             } 
  |             return false; 
  |          } 
  |          #else 
  |          inline bool is_comment_start(details::char_cptr) const 
  |          { 
  |             return false; 
  |          } 
  |          #endif 
  |  
  |          inline void skip_whitespace() 
  |          { 
  |             while (!is_end(s_itr_) && details::is_whitespace(*s_itr_)) 
  |             { 
  |                ++s_itr_; 
  |             } 
  |          } 
  |  
  |          inline void skip_comments() 
  |          { 
  |             #ifndef exprtk_disable_comments 
  |             // The following comment styles are supported: 
  |             // 1. // .... \n 
  |             // 2. #  .... \n 
  |             // 3. /* .... */ 
  |             struct test 
  |             { 
  |                static inline bool comment_start(const char_t c0, const char_t c1, int& mode, int& incr) 
  |                { 
  |                   mode = 0; 
  |                   if      ('#' == c0)    { mode = 1; incr = 1; } 
  |                   else if ('/' == c0) 
  |                   { 
  |                      if      ('/' == c1) { mode = 1; incr = 2; } 
  |                      else if ('*' == c1) { mode = 2; incr = 2; } 
  |                   } 
  |                   return (0 != mode); 
  |                } 
  |  
  |                static inline bool comment_end(const char_t c0, const char_t c1, int& mode) 
  |                { 
  |                   if ( 
  |                        ((1 == mode) && ('\n' == c0)) || 
  |                        ((2 == mode) && ( '*' == c0) && ('/' == c1)) 
  |                      ) 
  |                   { 
  |                      mode = 0; 
  |                      return true; 
  |                   } 
  |                   else 
  |                      return false; 
  |                } 
  |             }; 
  |  
  |             int mode      = 0; 
  |             int increment = 0; 
  |  
  |             if (is_end(s_itr_)) 
  |                return; 
  |             else if (!test::comment_start(*s_itr_, *(s_itr_ + 1), mode, increment)) 
  |                return; 
  |  
  |             details::char_cptr cmt_start = s_itr_; 
  |  
  |             s_itr_ += increment; 
  |  
  |             while (!is_end(s_itr_)) 
  |             { 
  |                if ((1 == mode) && test::comment_end(*s_itr_, 0, mode)) 
  |                { 
  |                   ++s_itr_; 
  |                   return; 
  |                } 
  |  
  |                if ((2 == mode)) 
  |                { 
  |                   if (!is_end((s_itr_ + 1)) && test::comment_end(*s_itr_, *(s_itr_ + 1), mode)) 
  |                   { 
  |                      s_itr_ += 2; 
  |                      return; 
  |                   } 
  |                } 
  |  
  |                ++s_itr_; 
  |             } 
  |  
  |             if (2 == mode) 
  |             { 
  |                token_t t; 
  |                t.set_error(token::e_error, cmt_start, cmt_start + mode, base_itr_); 
  |                token_list_.push_back(t); 
  |             } 
  |             #endif 
  |          } 
  |  
  |          inline bool next_is_digit(const details::char_cptr itr) const 
  |          { 
  |             return ((itr + 1) != s_end_) && 
  |                    details::is_digit(*(itr + 1)); 
  |          } 
  |  
  |          inline void scan_token() 
  |          { 
  |             const char_t c = *s_itr_; 
  |  
  |             if (details::is_whitespace(c)) 
  |             { 
  |                skip_whitespace(); 
  |                return; 
  |             } 
  |             else if (is_comment_start(s_itr_)) 
  |             { 
  |                skip_comments(); 
  |                return; 
  |             } 
  |             else if (details::is_operator_char(c)) 
  |             { 
  |                scan_operator(); 
  |                return; 
  |             } 
  |             else if (details::is_letter(c)) 
  |             { 
  |                scan_symbol(); 
  |                return; 
  |             } 
  |             else if (('.' == c) && !next_is_digit(s_itr_)) 
  |             { 
  |                scan_operator(); 
  |                return; 
  |             } 
  |             else if (details::is_digit(c) || ('.' == c)) 
  |             { 
  |                scan_number(); 
  |                return; 
  |             } 
  |             else if ('$' == c) 
  |             { 
  |                scan_special_function(); 
  |                return; 
  |             } 
  |             #ifndef exprtk_disable_string_capabilities 
  |             else if ('\'' == c) 
  |             { 
  |                scan_string(); 
  |                return; 
  |             } 
  |             #endif 
  |             else if ('~' == c) 
  |             { 
  |                token_t t; 
  |                t.set_symbol(s_itr_, s_itr_ + 1, base_itr_); 
  |                token_list_.push_back(t); 
  |                ++s_itr_; 
  |                return; 
  |             } 
  |             else 
  |             { 
  |                token_t t; 
  |                t.set_error(token::e_error, s_itr_, s_itr_ + 2, base_itr_); 
  |                token_list_.push_back(t); 
  |                ++s_itr_; 
  |             } 
  |          } 
  |  
  |          inline void scan_operator() 
  |          { 
  |             token_t t; 
  |  
  |             const char_t c0 = s_itr_[0]; 
  |  
  |             if (!is_end(s_itr_ + 1)) 
  |             { 
  |                const char_t c1 = s_itr_[1]; 
  |  
  |                if (!is_end(s_itr_ + 2)) 
  |                { 
  |                   const char_t c2 = s_itr_[2]; 
  |  
  |                   if ((c0 == '<') && (c1 == '=') && (c2 == '>')) 
  |                   { 
  |                      t.set_operator(token_t::e_swap, s_itr_, s_itr_ + 3, base_itr_); 
  |                      token_list_.push_back(t); 
  |                      s_itr_ += 3; 
  |                      return; 
  |                   } 
  |                } 
  |  
  |                token_t::token_type ttype = token_t::e_none; 
  |  
  |                if      ((c0 == '<') && (c1 == '=')) ttype = token_t::e_lte; 
  |                else if ((c0 == '>') && (c1 == '=')) ttype = token_t::e_gte; 
  |                else if ((c0 == '<') && (c1 == '>')) ttype = token_t::e_ne; 
  |                else if ((c0 == '!') && (c1 == '=')) ttype = token_t::e_ne; 
  |                else if ((c0 == '=') && (c1 == '=')) ttype = token_t::e_eq; 
  |                else if ((c0 == ':') && (c1 == '=')) ttype = token_t::e_assign; 
  |                else if ((c0 == '<') && (c1 == '<')) ttype = token_t::e_shl; 
  |                else if ((c0 == '>') && (c1 == '>')) ttype = token_t::e_shr; 
  |                else if ((c0 == '+') && (c1 == '=')) ttype = token_t::e_addass; 
  |                else if ((c0 == '-') && (c1 == '=')) ttype = token_t::e_subass; 
  |                else if ((c0 == '*') && (c1 == '=')) ttype = token_t::e_mulass; 
  |                else if ((c0 == '/') && (c1 == '=')) ttype = token_t::e_divass; 
  |                else if ((c0 == '%') && (c1 == '=')) ttype = token_t::e_modass; 
  |  
  |                if (token_t::e_none != ttype) 
  |                { 
  |                   t.set_operator(ttype, s_itr_, s_itr_ + 2, base_itr_); 
  |                   token_list_.push_back(t); 
  |                   s_itr_ += 2; 
  |                   return; 
  |                } 
  |             } 
  |  
  |             if ('<' == c0) 
  |                t.set_operator(token_t::e_lt , s_itr_, s_itr_ + 1, base_itr_); 
  |             else if ('>' == c0) 
  |                t.set_operator(token_t::e_gt , s_itr_, s_itr_ + 1, base_itr_); 
  |             else if (';' == c0) 
  |                t.set_operator(token_t::e_eof, s_itr_, s_itr_ + 1, base_itr_); 
  |             else if ('&' == c0) 
  |                t.set_symbol(s_itr_, s_itr_ + 1, base_itr_); 
  |             else if ('|' == c0) 
  |                t.set_symbol(s_itr_, s_itr_ + 1, base_itr_); 
  |             else 
  |                t.set_operator(token_t::token_type(c0), s_itr_, s_itr_ + 1, base_itr_); 
  |  
  |             token_list_.push_back(t); 
  |             ++s_itr_; 
  |          } 
  |  
  |          inline void scan_symbol() 
  |          { 
  |             details::char_cptr initial_itr = s_itr_; 
  |  
  |             while (!is_end(s_itr_)) 
  |             { 
  |                if (!details::is_letter_or_digit(*s_itr_) && ('_' != (*s_itr_))) 
  |                { 
  |                   if ('.' != (*s_itr_)) 
  |                      break; 
  |                   /* 
  |                      Permit symbols that contain a 'dot' 
  |                      Allowed   : abc.xyz, a123.xyz, abc.123, abc_.xyz a123_.xyz abc._123 
  |                      Disallowed: .abc, abc.<white-space>, abc.<eof>, abc.<operator +,-,*,/...> 
  |                   */ 
  |                   if ( 
  |                        (s_itr_ != initial_itr)                     && 
  |                        !is_end(s_itr_ + 1)                         && 
  |                        !details::is_letter_or_digit(*(s_itr_ + 1)) && 
  |                        ('_' != (*(s_itr_ + 1))) 
  |                      ) 
  |                      break; 
  |                } 
  |  
  |                ++s_itr_; 
  |             } 
  |  
  |             token_t t; 
  |             t.set_symbol(initial_itr, s_itr_, base_itr_); 
  |             token_list_.push_back(t); 
  |          } 
  |  
  |          inline void scan_number() 
  |          { 
  |             /* 
  |                Attempt to match a valid numeric value in one of the following formats: 
  |                (01) 123456 
  |                (02) 123456. 
  |                (03) 123.456 
  |                (04) 123.456e3 
  |                (05) 123.456E3 
  |                (06) 123.456e+3 
  |                (07) 123.456E+3 
  |                (08) 123.456e-3 
  |                (09) 123.456E-3 
  |                (00) .1234 
  |                (11) .1234e3 
  |                (12) .1234E+3 
  |                (13) .1234e+3 
  |                (14) .1234E-3 
  |                (15) .1234e-3 
  |             */ 
  |  
  |             details::char_cptr initial_itr = s_itr_; 
  |             bool dot_found                 = false; 
  |             bool e_found                   = false; 
  |             bool post_e_sign_found         = false; 
  |             bool post_e_digit_found        = false; 
  |             token_t t; 
  |  
  |             while (!is_end(s_itr_)) 
  |             { 
  |                if ('.' == (*s_itr_)) 
  |                { 
  |                   if (dot_found) 
  |                   { 
  |                      t.set_error(token::e_err_number, initial_itr, s_itr_, base_itr_); 
  |                      token_list_.push_back(t); 
  |  
  |                      return; 
  |                   } 
  |  
  |                   dot_found = true; 
  |                   ++s_itr_; 
  |  
  |                   continue; 
  |                } 
  |                else if ('e' == std::tolower(*s_itr_)) 
  |                { 
  |                   const char_t& c = *(s_itr_ + 1); 
  |  
  |                   if (is_end(s_itr_ + 1)) 
  |                   { 
  |                      t.set_error(token::e_err_number, initial_itr, s_itr_, base_itr_); 
  |                      token_list_.push_back(t); 
  |  
  |                      return; 
  |                   } 
  |                   else if ( 
  |                             ('+' != c) && 
  |                             ('-' != c) && 
  |                             !details::is_digit(c) 
  |                           ) 
  |                   { 
  |                      t.set_error(token::e_err_number, initial_itr, s_itr_, base_itr_); 
  |                      token_list_.push_back(t); 
  |  
  |                      return; 
  |                   } 
  |  
  |                   e_found = true; 
  |                   ++s_itr_; 
  |  
  |                   continue; 
  |                } 
  |                else if (e_found && details::is_sign(*s_itr_) && !post_e_digit_found) 
  |                { 
  |                   if (post_e_sign_found) 
  |                   { 
  |                      t.set_error(token::e_err_number, initial_itr, s_itr_, base_itr_); 
  |                      token_list_.push_back(t); 
  |  
  |                      return; 
  |                   } 
  |  
  |                   post_e_sign_found = true; 
  |                   ++s_itr_; 
  |  
  |                   continue; 
  |                } 
  |                else if (e_found && details::is_digit(*s_itr_)) 
  |                { 
  |                   post_e_digit_found = true; 
  |                   ++s_itr_; 
  |  
  |                   continue; 
  |                } 
  |                else if (('.' != (*s_itr_)) && !details::is_digit(*s_itr_)) 
  |                   break; 
  |                else 
  |                   ++s_itr_; 
  |             } 
  |  
  |             t.set_numeric(initial_itr, s_itr_, base_itr_); 
  |             token_list_.push_back(t); 
  |  
  |             return; 
  |          } 
  |  
  |          inline void scan_special_function() 
  |          { 
  |             details::char_cptr initial_itr = s_itr_; 
  |             token_t t; 
  |  
  |             // $fdd(x,x,x) = at least 11 chars 
  |             if (std::distance(s_itr_,s_end_) < 11) 
  |             { 
  |                t.set_error( 
  |                   token::e_err_sfunc, 
  |                   initial_itr, std::min(initial_itr + 11, s_end_), 
  |                   base_itr_); 
  |                token_list_.push_back(t); 
  |  
  |                return; 
  |             } 
  |  
  |             if ( 
  |                  !(('$' == *s_itr_)                       && 
  |                    (details::imatch  ('f',*(s_itr_ + 1))) && 
  |                    (details::is_digit(*(s_itr_ + 2)))     && 
  |                    (details::is_digit(*(s_itr_ + 3)))) 
  |                ) 
  |             { 
  |                t.set_error( 
  |                   token::e_err_sfunc, 
  |                   initial_itr, std::min(initial_itr + 4, s_end_), 
  |                   base_itr_); 
  |                token_list_.push_back(t); 
  |  
  |                return; 
  |             } 
  |  
  |             s_itr_ += 4; // $fdd = 4chars 
  |  
  |             t.set_symbol(initial_itr, s_itr_, base_itr_); 
  |             token_list_.push_back(t); 
  |  
  |             return; 
  |          } 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          inline void scan_string() 
  |          { 
  |             details::char_cptr initial_itr = s_itr_ + 1; 
  |             token_t t; 
  |  
  |             if (std::distance(s_itr_,s_end_) < 2) 
  |             { 
  |                t.set_error(token::e_err_string, s_itr_, s_end_, base_itr_); 
  |                token_list_.push_back(t); 
  |  
  |                return; 
  |             } 
  |  
  |             ++s_itr_; 
  |  
  |             bool escaped_found = false; 
  |             bool escaped = false; 
  |  
  |             while (!is_end(s_itr_)) 
  |             { 
  |                if (!details::is_valid_string_char(*s_itr_)) 
  |                { 
  |                   t.set_error(token::e_err_string, initial_itr, s_itr_, base_itr_); 
  |                   token_list_.push_back(t); 
  |  
  |                   return; 
  |                } 
  |                else if (!escaped && ('\\' == *s_itr_)) 
  |                { 
  |                   escaped_found = true; 
  |                   escaped = true; 
  |                   ++s_itr_; 
  |  
  |                   continue; 
  |                } 
  |                else if (!escaped) 
  |                { 
  |                   if ('\'' == *s_itr_) 
  |                      break; 
  |                } 
  |                else if (escaped) 
  |                { 
  |                   if ( 
  |                        !is_end(s_itr_) && ('0' == *(s_itr_)) && 
  |                        ((s_itr_ + 4) <= s_end_) 
  |                      ) 
  |                   { 
  |                      const bool x_separator = ('X' == std::toupper(*(s_itr_ + 1))); 
  |  
  |                      const bool both_digits = details::is_hex_digit(*(s_itr_ + 2)) && 
  |                                               details::is_hex_digit(*(s_itr_ + 3)) ; 
  |  
  |                      if (!(x_separator && both_digits)) 
  |                      { 
  |                         t.set_error(token::e_err_string, initial_itr, s_itr_, base_itr_); 
  |                         token_list_.push_back(t); 
  |  
  |                         return; 
  |                      } 
  |                      else 
  |                         s_itr_ += 3; 
  |                   } 
  |  
  |                   escaped = false; 
  |                } 
  |  
  |                ++s_itr_; 
  |             } 
  |  
  |             if (is_end(s_itr_)) 
  |             { 
  |                t.set_error(token::e_err_string, initial_itr, s_itr_, base_itr_); 
  |                token_list_.push_back(t); 
  |  
  |                return; 
  |             } 
  |  
  |             if (!escaped_found) 
  |                t.set_string(initial_itr, s_itr_, base_itr_); 
  |             else 
  |             { 
  |                std::string parsed_string(initial_itr,s_itr_); 
  |  
  |                if (!details::cleanup_escapes(parsed_string)) 
  |                { 
  |                   t.set_error(token::e_err_string, initial_itr, s_itr_, base_itr_); 
  |                   token_list_.push_back(t); 
  |  
  |                   return; 
  |                } 
  |  
  |                t.set_string( 
  |                   parsed_string, 
  |                   static_cast<std::size_t>(std::distance(base_itr_,initial_itr))); 
  |             } 
  |  
  |             token_list_.push_back(t); 
  |             ++s_itr_; 
  |  
  |             return; 
  |          } 
  |          #endif 
  |  
  |       private: 
  |  
  |          token_list_t       token_list_; 
  |          token_list_itr_t   token_itr_; 
  |          token_list_itr_t   store_token_itr_; 
  |          token_t            eof_token_; 
  |          details::char_cptr base_itr_; 
  |          details::char_cptr s_itr_; 
  |          details::char_cptr s_end_; 
  |  
  |          friend class token_scanner; 
  |          friend class token_modifier; 
  |          friend class token_inserter; 
  |          friend class token_joiner; 
  |       }; // class generator 
  |  
  |       class helper_interface 
  |       { 
  |       public: 
  |  
  |          virtual void init()                     {              } 
  |          virtual void reset()                    {              } 
  |          virtual bool result()                   { return true; } 
  |          virtual std::size_t process(generator&) { return 0;    } 
  |          virtual ~helper_interface()             {              } 
  |       }; 
  |  
  |       class token_scanner : public helper_interface 
  |       { 
  |       public: 
  |  
  |          virtual ~token_scanner() 
  |          {} 
  |  
  |          explicit token_scanner(const std::size_t& stride) 
  |          : stride_(stride) 
  |          { 
  |             if (stride > 4) 
  |             { 
  |                throw std::invalid_argument("token_scanner() - Invalid stride value"); 
  |             } 
  |          } 
  |  
  |          inline std::size_t process(generator& g) exprtk_override 
  |          { 
  |             if (g.token_list_.size() >= stride_) 
  |             { 
  |                for (std::size_t i = 0; i < (g.token_list_.size() - stride_ + 1); ++i) 
  |                { 
  |                   token t; 
  |  
  |                   switch (stride_) 
  |                   { 
  |                      case 1 : 
  |                               { 
  |                                  const token& t0 = g.token_list_[i]; 
  |  
  |                                  if (!operator()(t0)) 
  |                                  { 
  |                                     return 0; 
  |                                  } 
  |                               } 
  |                               break; 
  |  
  |                      case 2 : 
  |                               { 
  |                                  const token& t0 = g.token_list_[i    ]; 
  |                                  const token& t1 = g.token_list_[i + 1]; 
  |  
  |                                  if (!operator()(t0, t1)) 
  |                                  { 
  |                                     return 0; 
  |                                  } 
  |                               } 
  |                               break; 
  |  
  |                      case 3 : 
  |                               { 
  |                                  const token& t0 = g.token_list_[i    ]; 
  |                                  const token& t1 = g.token_list_[i + 1]; 
  |                                  const token& t2 = g.token_list_[i + 2]; 
  |  
  |                                  if (!operator()(t0, t1, t2)) 
  |                                  { 
  |                                     return 0; 
  |                                  } 
  |                               } 
  |                               break; 
  |  
  |                      case 4 : 
  |                               { 
  |                                  const token& t0 = g.token_list_[i    ]; 
  |                                  const token& t1 = g.token_list_[i + 1]; 
  |                                  const token& t2 = g.token_list_[i + 2]; 
  |                                  const token& t3 = g.token_list_[i + 3]; 
  |  
  |                                  if (!operator()(t0, t1, t2, t3)) 
  |                                  { 
  |                                     return 0; 
  |                                  } 
  |                               } 
  |                               break; 
  |                   } 
  |                } 
  |             } 
  |  
  |             return 0; 
  |          } 
  |  
  |          virtual bool operator() (const token&) 
  |          { 
  |             return false; 
  |          } 
  |  
  |          virtual bool operator() (const token&, const token&) 
  |          { 
  |             return false; 
  |          } 
  |  
  |          virtual bool operator() (const token&, const token&, const token&) 
  |          { 
  |             return false; 
  |          } 
  |  
  |          virtual bool operator() (const token&, const token&, const token&, const token&) 
  |          { 
  |             return false; 
  |          } 
  |  
  |       private: 
  |  
  |          const std::size_t stride_; 
  |       }; // class token_scanner 
  |  
  |       class token_modifier : public helper_interface 
  |       { 
  |       public: 
  |  
  |          inline std::size_t process(generator& g) exprtk_override 
  |          { 
  |             std::size_t changes = 0; 
  |  
  |             for (std::size_t i = 0; i < g.token_list_.size(); ++i) 
  |             { 
  |                if (modify(g.token_list_[i])) changes++; 
  |             } 
  |  
  |             return changes; 
  |          } 
  |  
  |          virtual bool modify(token& t) = 0; 
  |       }; 
  |  
  |       class token_inserter : public helper_interface 
  |       { 
  |       public: 
  |  
  |          explicit token_inserter(const std::size_t& stride) 
  |          : stride_(stride) 
  |          { 
  |             if (stride > 5) 
  |             { 
  |                throw std::invalid_argument("token_inserter() - Invalid stride value"); 
  |             } 
  |          } 
  |  
  |          inline std::size_t process(generator& g) exprtk_override 
  |          { 
  |             if (g.token_list_.empty()) 
  |                return 0; 
  |             else if (g.token_list_.size() < stride_) 
  |                return 0; 
  |  
  |             std::size_t changes = 0; 
  |  
  |             typedef std::pair<std::size_t, token> insert_t; 
  |             std::vector<insert_t> insert_list; 
  |             insert_list.reserve(10000); 
  |  
  |             for (std::size_t i = 0; i < (g.token_list_.size() - stride_ + 1); ++i) 
  |             { 
  |                int insert_index = -1; 
  |                token t; 
  |  
  |                switch (stride_) 
  |                { 
  |                   case 1 : insert_index = insert(g.token_list_[i],t); 
  |                            break; 
  |  
  |                   case 2 : insert_index = insert(g.token_list_[i], g.token_list_[i + 1], t); 
  |                            break; 
  |  
  |                   case 3 : insert_index = insert(g.token_list_[i], g.token_list_[i + 1], g.token_list_[i + 2], t); 
  |                            break; 
  |  
  |                   case 4 : insert_index = insert(g.token_list_[i], g.token_list_[i + 1], g.token_list_[i + 2], g.token_list_[i + 3], t); 
  |                            break; 
  |  
  |                   case 5 : insert_index = insert(g.token_list_[i], g.token_list_[i + 1], g.token_list_[i + 2], g.token_list_[i + 3], g.token_list_[i + 4], t); 
  |                            break; 
  |                } 
  |  
  |                if ((insert_index >= 0) && (insert_index <= (static_cast<int>(stride_) + 1))) 
  |                { 
  |                   insert_list.push_back(insert_t(i, t)); 
  |                   changes++; 
  |                } 
  |             } 
  |  
  |             if (!insert_list.empty()) 
  |             { 
  |                generator::token_list_t token_list; 
  |  
  |                std::size_t insert_index = 0; 
  |  
  |                for (std::size_t i = 0; i < g.token_list_.size(); ++i) 
  |                { 
  |                   token_list.push_back(g.token_list_[i]); 
  |  
  |                   if ( 
  |                        (insert_index < insert_list.size()) && 
  |                        (insert_list[insert_index].first == i) 
  |                      ) 
  |                   { 
  |                      token_list.push_back(insert_list[insert_index].second); 
  |                      insert_index++; 
  |                   } 
  |                } 
  |  
  |                std::swap(g.token_list_,token_list); 
  |             } 
  |  
  |             return changes; 
  |          } 
  |  
  |          #define token_inserter_empty_body \ 
  |          {                                 \ 
  |             return -1;                     \ 
  |          }                                 \ 
  |  
  |          inline virtual int insert(const token&, token&) 
  |          token_inserter_empty_body 
  |  
  |          inline virtual int insert(const token&, const token&, token&) 
  |          token_inserter_empty_body 
  |  
  |          inline virtual int insert(const token&, const token&, const token&, token&) 
  |          token_inserter_empty_body 
  |  
  |          inline virtual int insert(const token&, const token&, const token&, const token&, token&) 
  |          token_inserter_empty_body 
  |  
  |          inline virtual int insert(const token&, const token&, const token&, const token&, const token&, token&) 
  |          token_inserter_empty_body 
  |  
  |          #undef token_inserter_empty_body 
  |  
  |       private: 
  |  
  |          const std::size_t stride_; 
  |       }; 
  |  
  |       class token_joiner : public helper_interface 
  |       { 
  |       public: 
  |  
  |          explicit token_joiner(const std::size_t& stride) 
  |          : stride_(stride) 
  |          {} 
  |  
  |          inline std::size_t process(generator& g) exprtk_override 
  |          { 
  |             if (g.token_list_.empty()) 
  |                return 0; 
  |  
  |             switch (stride_) 
  |             { 
  |                case 2  : return process_stride_2(g); 
  |                case 3  : return process_stride_3(g); 
  |                default : return 0; 
  |             } 
  |          } 
  |  
  |          virtual bool join(const token&, const token&, token&)               { return false; } 
  |          virtual bool join(const token&, const token&, const token&, token&) { return false; } 
  |  
  |       private: 
  |  
  |          inline std::size_t process_stride_2(generator& g) 
  |          { 
  |             if (g.token_list_.size() < 2) 
  |                return 0; 
  |  
  |             std::size_t changes = 0; 
  |  
  |             generator::token_list_t token_list; 
  |             token_list.reserve(10000); 
  |  
  |             for (int i = 0; i < static_cast<int>(g.token_list_.size() - 1); ++i) 
  |             { 
  |                token t; 
  |  
  |                for ( ; ; ) 
  |                { 
  |                   if (!join(g[i], g[i + 1], t)) 
  |                   { 
  |                      token_list.push_back(g[i]); 
  |                      break; 
  |                   } 
  |  
  |                   token_list.push_back(t); 
  |  
  |                   ++changes; 
  |  
  |                   i += 2; 
  |  
  |                   if (static_cast<std::size_t>(i) >= (g.token_list_.size() - 1)) 
  |                      break; 
  |                } 
  |             } 
  |  
  |             token_list.push_back(g.token_list_.back()); 
  |  
  |             assert(token_list.size() <= g.token_list_.size()); 
  |  
  |             std::swap(token_list, g.token_list_); 
  |  
  |             return changes; 
  |          } 
  |  
  |          inline std::size_t process_stride_3(generator& g) 
  |          { 
  |             if (g.token_list_.size() < 3) 
  |                return 0; 
  |  
  |             std::size_t changes = 0; 
  |  
  |             generator::token_list_t token_list; 
  |             token_list.reserve(10000); 
  |  
  |             for (int i = 0; i < static_cast<int>(g.token_list_.size() - 2); ++i) 
  |             { 
  |                token t; 
  |  
  |                for ( ; ; ) 
  |                { 
  |                   if (!join(g[i], g[i + 1], g[i + 2], t)) 
  |                   { 
  |                      token_list.push_back(g[i]); 
  |                      break; 
  |                   } 
  |  
  |                   token_list.push_back(t); 
  |  
  |                   ++changes; 
  |  
  |                   i += 3; 
  |  
  |                   if (static_cast<std::size_t>(i) >= (g.token_list_.size() - 2)) 
  |                      break; 
  |                } 
  |             } 
  |  
  |             token_list.push_back(*(g.token_list_.begin() + g.token_list_.size() - 2)); 
  |             token_list.push_back(*(g.token_list_.begin() + g.token_list_.size() - 1)); 
  |  
  |             assert(token_list.size() <= g.token_list_.size()); 
  |  
  |             std::swap(token_list, g.token_list_); 
  |  
  |             return changes; 
  |          } 
  |  
  |          const std::size_t stride_; 
  |       }; 
  |  
  |       namespace helper 
  |       { 
  |  
  |          inline void dump(const lexer::generator& generator) 
  |          { 
  |             for (std::size_t i = 0; i < generator.size(); ++i) 
  |             { 
  |                const lexer::token& t = generator[i]; 
  |                printf("Token[%02d] @ %03d  %6s  -->  '%s'\n", 
  |                       static_cast<int>(i), 
  |                       static_cast<int>(t.position), 
  |                       t.to_str(t.type).c_str(), 
  |                       t.value.c_str()); 
  |             } 
  |          } 
  |  
  |          class commutative_inserter : public lexer::token_inserter 
  |          { 
  |          public: 
  |  
  |             using lexer::token_inserter::insert; 
  |  
  |             commutative_inserter() 
  |             : lexer::token_inserter(2) 
  |             {} 
  |  
  |             inline void ignore_symbol(const std::string& symbol) 
  |             { 
  |                ignore_set_.insert(symbol); 
  |             } 
  |  
  |             inline int insert(const lexer::token& t0, const lexer::token& t1, lexer::token& new_token) exprtk_override 
  |             { 
  |                bool match         = false; 
  |                new_token.type     = lexer::token::e_mul; 
  |                new_token.value    = "*" 
  |                new_token.position = t1.position; 
  |  
  |                if (t0.type == lexer::token::e_symbol) 
  |                { 
  |                   if (ignore_set_.end() != ignore_set_.find(t0.value)) 
  |                   { 
  |                      return -1; 
  |                   } 
  |                   else if (!t0.value.empty() && ('$' == t0.value[0])) 
  |                   { 
  |                      return -1; 
  |                   } 
  |                } 
  |  
  |                if (t1.type == lexer::token::e_symbol) 
  |                { 
  |                   if (ignore_set_.end() != ignore_set_.find(t1.value)) 
  |                   { 
  |                      return -1; 
  |                   } 
  |                } 
  |                if      ((t0.type == lexer::token::e_number     ) && (t1.type == lexer::token::e_symbol     )) match = true; 
  |                else if ((t0.type == lexer::token::e_number     ) && (t1.type == lexer::token::e_lbracket   )) match = true; 
  |                else if ((t0.type == lexer::token::e_number     ) && (t1.type == lexer::token::e_lcrlbracket)) match = true; 
  |                else if ((t0.type == lexer::token::e_number     ) && (t1.type == lexer::token::e_lsqrbracket)) match = true; 
  |                else if ((t0.type == lexer::token::e_symbol     ) && (t1.type == lexer::token::e_number     )) match = true; 
  |                else if ((t0.type == lexer::token::e_rbracket   ) && (t1.type == lexer::token::e_number     )) match = true; 
  |                else if ((t0.type == lexer::token::e_rcrlbracket) && (t1.type == lexer::token::e_number     )) match = true; 
  |                else if ((t0.type == lexer::token::e_rsqrbracket) && (t1.type == lexer::token::e_number     )) match = true; 
  |                else if ((t0.type == lexer::token::e_rbracket   ) && (t1.type == lexer::token::e_symbol     )) match = true; 
  |                else if ((t0.type == lexer::token::e_rcrlbracket) && (t1.type == lexer::token::e_symbol     )) match = true; 
  |                else if ((t0.type == lexer::token::e_rsqrbracket) && (t1.type == lexer::token::e_symbol     )) match = true; 
  |                else if ((t0.type == lexer::token::e_symbol     ) && (t1.type == lexer::token::e_symbol     )) match = true; 
  |  
  |                return (match) ? 1 : -1; 
  |             } 
  |  
  |          private: 
  |  
  |             std::set<std::string,details::ilesscompare> ignore_set_; 
  |          }; 
  |  
  |          class operator_joiner exprtk_final : public token_joiner 
  |          { 
  |          public: 
  |  
  |             explicit operator_joiner(const std::size_t& stride) 
  |             : token_joiner(stride) 
  |             {} 
  |  
  |             inline bool join(const lexer::token& t0, const lexer::token& t1, lexer::token& t) exprtk_override 
  |             { 
  |                // ': =' --> ':=' 
  |                if ((t0.type == lexer::token::e_colon) && (t1.type == lexer::token::e_eq)) 
  |                { 
  |                   t.type     = lexer::token::e_assign; 
  |                   t.value    = ":=" 
  |                   t.position = t0.position; 
  |  
  |                   return true; 
  |                } 
  |                // '+ =' --> '+=' 
  |                else if ((t0.type == lexer::token::e_add) && (t1.type == lexer::token::e_eq)) 
  |                { 
  |                   t.type     = lexer::token::e_addass; 
  |                   t.value    = "+=" 
  |                   t.position = t0.position; 
  |  
  |                   return true; 
  |                } 
  |                // '- =' --> '-=' 
  |                else if ((t0.type == lexer::token::e_sub) && (t1.type == lexer::token::e_eq)) 
  |                { 
  |                   t.type     = lexer::token::e_subass; 
  |                   t.value    = "-=" 
  |                   t.position = t0.position; 
  |  
  |                   return true; 
  |                } 
  |                // '* =' --> '*=' 
  |                else if ((t0.type == lexer::token::e_mul) && (t1.type == lexer::token::e_eq)) 
  |                { 
  |                   t.type     = lexer::token::e_mulass; 
  |                   t.value    = "*=" 
  |                   t.position = t0.position; 
  |  
  |                   return true; 
  |                } 
  |                // '/ =' --> '/=' 
  |                else if ((t0.type == lexer::token::e_div) && (t1.type == lexer::token::e_eq)) 
  |                { 
  |                   t.type     = lexer::token::e_divass; 
  |                   t.value    = "/=" 
  |                   t.position = t0.position; 
  |  
  |                   return true; 
  |                } 
  |                // '% =' --> '%=' 
  |                else if ((t0.type == lexer::token::e_mod) && (t1.type == lexer::token::e_eq)) 
  |                { 
  |                   t.type     = lexer::token::e_modass; 
  |                   t.value    = "%=" 
  |                   t.position = t0.position; 
  |  
  |                   return true; 
  |                } 
  |                // '> =' --> '>=' 
  |                else if ((t0.type == lexer::token::e_gt) && (t1.type == lexer::token::e_eq)) 
  |                { 
  |                   t.type     = lexer::token::e_gte; 
  |                   t.value    = ">=" 
  |                   t.position = t0.position; 
  |  
  |                   return true; 
  |                } 
  |                // '< =' --> '<=' 
  |                else if ((t0.type == lexer::token::e_lt) && (t1.type == lexer::token::e_eq)) 
  |                { 
  |                   t.type     = lexer::token::e_lte; 
  |                   t.value    = "<=" 
  |                   t.position = t0.position; 
  |  
  |                   return true; 
  |                } 
  |                // '= =' --> '==' 
  |                else if ((t0.type == lexer::token::e_eq) && (t1.type == lexer::token::e_eq)) 
  |                { 
  |                   t.type     = lexer::token::e_eq; 
  |                   t.value    = "==" 
  |                   t.position = t0.position; 
  |  
  |                   return true; 
  |                } 
  |                // '! =' --> '!=' 
  |                else if ((static_cast<details::char_t>(t0.type) == '!') && (t1.type == lexer::token::e_eq)) 
  |                { 
  |                   t.type     = lexer::token::e_ne; 
  |                   t.value    = "!=" 
  |                   t.position = t0.position; 
  |  
  |                   return true; 
  |                } 
  |                // '< >' --> '<>' 
  |                else if ((t0.type == lexer::token::e_lt) && (t1.type == lexer::token::e_gt)) 
  |                { 
  |                   t.type     = lexer::token::e_ne; 
  |                   t.value    = "<>" 
  |                   t.position = t0.position; 
  |  
  |                   return true; 
  |                } 
  |                // '<= >' --> '<=>' 
  |                else if ((t0.type == lexer::token::e_lte) && (t1.type == lexer::token::e_gt)) 
  |                { 
  |                   t.type     = lexer::token::e_swap; 
  |                   t.value    = "<=>" 
  |                   t.position = t0.position; 
  |  
  |                   return true; 
  |                } 
  |                // '+ -' --> '-' 
  |                else if ((t0.type == lexer::token::e_add) && (t1.type == lexer::token::e_sub)) 
  |                { 
  |                   t.type     = lexer::token::e_sub; 
  |                   t.value    = "-" 
  |                   t.position = t0.position; 
  |  
  |                   return true; 
  |                } 
  |                // '- +' --> '-' 
  |                else if ((t0.type == lexer::token::e_sub) && (t1.type == lexer::token::e_add)) 
  |                { 
  |                   t.type     = lexer::token::e_sub; 
  |                   t.value    = "-" 
  |                   t.position = t0.position; 
  |  
  |                   return true; 
  |                } 
  |                // '- -' --> '+' 
  |                else if ((t0.type == lexer::token::e_sub) && (t1.type == lexer::token::e_sub)) 
  |                { 
  |                   /* 
  |                      Note: May need to reconsider this when wanting to implement 
  |                      pre/postfix decrement operator 
  |                   */ 
  |                   t.type     = lexer::token::e_add; 
  |                   t.value    = "+" 
  |                   t.position = t0.position; 
  |  
  |                   return true; 
  |                } 
  |                else 
  |                   return false; 
  |             } 
  |  
  |             inline bool join(const lexer::token& t0, 
  |                              const lexer::token& t1, 
  |                              const lexer::token& t2, 
  |                              lexer::token& t) exprtk_override 
  |             { 
  |                // '[ * ]' --> '[*]' 
  |                if ( 
  |                     (t0.type == lexer::token::e_lsqrbracket) && 
  |                     (t1.type == lexer::token::e_mul        ) && 
  |                     (t2.type == lexer::token::e_rsqrbracket) 
  |                   ) 
  |                { 
  |                   t.type     = lexer::token::e_symbol; 
  |                   t.value    = "[*]" 
  |                   t.position = t0.position; 
  |  
  |                   return true; 
  |                } 
  |                else 
  |                   return false; 
  |             } 
  |          }; 
  |  
  |          class bracket_checker exprtk_final : public lexer::token_scanner 
  |          { 
  |          public: 
  |  
  |             using lexer::token_scanner::operator(); 
  |  
  |             bracket_checker() 
  |             : token_scanner(1) 
  |             , state_(true) 
  |             {} 
  |  
  |             bool result() exprtk_override 
  |             { 
  |                if (!stack_.empty()) 
  |                { 
  |                   lexer::token t; 
  |                   t.value      = stack_.top().first; 
  |                   t.position   = stack_.top().second; 
  |                   error_token_ = t; 
  |                   state_       = false; 
  |  
  |                   return false; 
  |                } 
  |                else 
  |                   return state_; 
  |             } 
  |  
  |             lexer::token error_token() 
  |             { 
  |                return error_token_; 
  |             } 
  |  
  |             void reset() exprtk_override 
  |             { 
  |                // Why? because msvc doesn't support swap properly. 
  |                stack_ = std::stack<std::pair<char,std::size_t> >(); 
  |                state_ = true; 
  |                error_token_.clear(); 
  |             } 
  |  
  |             bool operator() (const lexer::token& t) exprtk_override 
  |             { 
  |                if ( 
  |                     !t.value.empty()                       && 
  |                     (lexer::token::e_string != t.type)     && 
  |                     (lexer::token::e_symbol != t.type)     && 
  |                     exprtk::details::is_bracket(t.value[0]) 
  |                   ) 
  |                { 
  |                   details::char_t c = t.value[0]; 
  |  
  |                   if      (t.type == lexer::token::e_lbracket   ) stack_.push(std::make_pair(')',t.position)); 
  |                   else if (t.type == lexer::token::e_lcrlbracket) stack_.push(std::make_pair('}',t.position)); 
  |                   else if (t.type == lexer::token::e_lsqrbracket) stack_.push(std::make_pair(']',t.position)); 
  |                   else if (exprtk::details::is_right_bracket(c)) 
  |                   { 
  |                      if (stack_.empty()) 
  |                      { 
  |                         state_       = false; 
  |                         error_token_ = t; 
  |  
  |                         return false; 
  |                      } 
  |                      else if (c != stack_.top().first) 
  |                      { 
  |                         state_       = false; 
  |                         error_token_ = t; 
  |  
  |                         return false; 
  |                      } 
  |                      else 
  |                         stack_.pop(); 
  |                   } 
  |                } 
  |  
  |                return true; 
  |             } 
  |  
  |          private: 
  |  
  |             bool state_; 
  |             std::stack<std::pair<char,std::size_t> > stack_; 
  |             lexer::token error_token_; 
  |          }; 
  |  
  |          template <typename T> 
  |          class numeric_checker exprtk_final : public lexer::token_scanner 
  |          { 
  |          public: 
  |  
  |             using lexer::token_scanner::operator(); 
  |  
  |             numeric_checker() 
  |             : token_scanner (1) 
  |             , current_index_(0) 
  |             {} 
  |  
  |             bool result() exprtk_override 
  |             { 
  |                return error_list_.empty(); 
  |             } 
  |  
  |             void reset() exprtk_override 
  |             { 
  |                error_list_.clear(); 
  |                current_index_ = 0; 
  |             } 
  |  
  |             bool operator() (const lexer::token& t) exprtk_override 
  |             { 
  |                if (token::e_number == t.type) 
  |                { 
  |                   T v; 
  |  
  |                   if (!exprtk::details::string_to_real(t.value,v)) 
  |                   { 
  |                      error_list_.push_back(current_index_); 
  |                   } 
  |                } 
  |  
  |                ++current_index_; 
  |  
  |                return true; 
  |             } 
  |  
  |             std::size_t error_count() const 
  |             { 
  |                return error_list_.size(); 
  |             } 
  |  
  |             std::size_t error_index(const std::size_t& i) 
  |             { 
  |                if (i < error_list_.size()) 
  |                   return error_list_[i]; 
  |                else 
  |                   return std::numeric_limits<std::size_t>::max(); 
  |             } 
  |  
  |             void clear_errors() 
  |             { 
  |                error_list_.clear(); 
  |             } 
  |  
  |          private: 
  |  
  |             std::size_t current_index_; 
  |             std::vector<std::size_t> error_list_; 
  |          }; 
  |  
  |          class symbol_replacer exprtk_final : public lexer::token_modifier 
  |          { 
  |          private: 
  |  
  |             typedef std::map<std::string,std::pair<std::string,token::token_type>,details::ilesscompare> replace_map_t; 
  |  
  |          public: 
  |  
  |             bool remove(const std::string& target_symbol) 
  |             { 
  |                const replace_map_t::iterator itr = replace_map_.find(target_symbol); 
  |  
  |                if (replace_map_.end() == itr) 
  |                   return false; 
  |  
  |                replace_map_.erase(itr); 
  |  
  |                return true; 
  |             } 
  |  
  |             bool add_replace(const std::string& target_symbol, 
  |                              const std::string& replace_symbol, 
  |                              const lexer::token::token_type token_type = lexer::token::e_symbol) 
  |             { 
  |                const replace_map_t::iterator itr = replace_map_.find(target_symbol); 
  |  
  |                if (replace_map_.end() != itr) 
  |                { 
  |                   return false; 
  |                } 
  |  
  |                replace_map_[target_symbol] = std::make_pair(replace_symbol,token_type); 
  |  
  |                return true; 
  |             } 
  |  
  |             void clear() 
  |             { 
  |                replace_map_.clear(); 
  |             } 
  |  
  |          private: 
  |  
  |             bool modify(lexer::token& t) exprtk_override 
  |             { 
  |                if (lexer::token::e_symbol == t.type) 
  |                { 
  |                   if (replace_map_.empty()) 
  |                      return false; 
  |  
  |                   const replace_map_t::iterator itr = replace_map_.find(t.value); 
  |  
  |                   if (replace_map_.end() != itr) 
  |                   { 
  |                      t.value = itr->second.first; 
  |                      t.type  = itr->second.second; 
  |  
  |                      return true; 
  |                   } 
  |                } 
  |  
  |                return false; 
  |             } 
  |  
  |             replace_map_t replace_map_; 
  |          }; 
  |  
  |          class sequence_validator exprtk_final : public lexer::token_scanner 
  |          { 
  |          private: 
  |  
  |             typedef std::pair<lexer::token::token_type,lexer::token::token_type> token_pair_t; 
  |             typedef std::set<token_pair_t> set_t; 
  |  
  |          public: 
  |  
  |             using lexer::token_scanner::operator(); 
  |  
  |             sequence_validator() 
  |             : lexer::token_scanner(2) 
  |             { 
  |                add_invalid(lexer::token::e_number, lexer::token::e_number); 
  |                add_invalid(lexer::token::e_string, lexer::token::e_string); 
  |                add_invalid(lexer::token::e_number, lexer::token::e_string); 
  |                add_invalid(lexer::token::e_string, lexer::token::e_number); 
  |  
  |                add_invalid_set1(lexer::token::e_assign ); 
  |                add_invalid_set1(lexer::token::e_shr    ); 
  |                add_invalid_set1(lexer::token::e_shl    ); 
  |                add_invalid_set1(lexer::token::e_lte    ); 
  |                add_invalid_set1(lexer::token::e_ne     ); 
  |                add_invalid_set1(lexer::token::e_gte    ); 
  |                add_invalid_set1(lexer::token::e_lt     ); 
  |                add_invalid_set1(lexer::token::e_gt     ); 
  |                add_invalid_set1(lexer::token::e_eq     ); 
  |                add_invalid_set1(lexer::token::e_comma  ); 
  |                add_invalid_set1(lexer::token::e_add    ); 
  |                add_invalid_set1(lexer::token::e_sub    ); 
  |                add_invalid_set1(lexer::token::e_div    ); 
  |                add_invalid_set1(lexer::token::e_mul    ); 
  |                add_invalid_set1(lexer::token::e_mod    ); 
  |                add_invalid_set1(lexer::token::e_pow    ); 
  |                add_invalid_set1(lexer::token::e_colon  ); 
  |                add_invalid_set1(lexer::token::e_ternary); 
  |             } 
  |  
  |             bool result() exprtk_override 
  |             { 
  |                return error_list_.empty(); 
  |             } 
  |  
  |             bool operator() (const lexer::token& t0, const lexer::token& t1) exprtk_override 
  |             { 
  |                const set_t::value_type p = std::make_pair(t0.type,t1.type); 
  |  
  |                if (invalid_bracket_check(t0.type,t1.type)) 
  |                { 
  |                   error_list_.push_back(std::make_pair(t0,t1)); 
  |                } 
  |                else if (invalid_comb_.find(p) != invalid_comb_.end()) 
  |                { 
  |                   error_list_.push_back(std::make_pair(t0,t1)); 
  |                } 
  |  
  |                return true; 
  |             } 
  |  
  |             std::size_t error_count() const 
  |             { 
  |                return error_list_.size(); 
  |             } 
  |  
  |             std::pair<lexer::token,lexer::token> error(const std::size_t index) 
  |             { 
  |                if (index < error_list_.size()) 
  |                { 
  |                   return error_list_[index]; 
  |                } 
  |                else 
  |                { 
  |                   static const lexer::token error_token; 
  |                   return std::make_pair(error_token,error_token); 
  |                } 
  |             } 
  |  
  |             void clear_errors() 
  |             { 
  |                error_list_.clear(); 
  |             } 
  |  
  |          private: 
  |  
  |             void add_invalid(const lexer::token::token_type base, const lexer::token::token_type t) 
  |             { 
  |                invalid_comb_.insert(std::make_pair(base,t)); 
  |             } 
  |  
  |             void add_invalid_set1(const lexer::token::token_type t) 
  |             { 
  |                add_invalid(t, lexer::token::e_assign); 
  |                add_invalid(t, lexer::token::e_shr   ); 
  |                add_invalid(t, lexer::token::e_shl   ); 
  |                add_invalid(t, lexer::token::e_lte   ); 
  |                add_invalid(t, lexer::token::e_ne    ); 
  |                add_invalid(t, lexer::token::e_gte   ); 
  |                add_invalid(t, lexer::token::e_lt    ); 
  |                add_invalid(t, lexer::token::e_gt    ); 
  |                add_invalid(t, lexer::token::e_eq    ); 
  |                add_invalid(t, lexer::token::e_comma ); 
  |                add_invalid(t, lexer::token::e_div   ); 
  |                add_invalid(t, lexer::token::e_mul   ); 
  |                add_invalid(t, lexer::token::e_mod   ); 
  |                add_invalid(t, lexer::token::e_pow   ); 
  |                add_invalid(t, lexer::token::e_colon ); 
  |             } 
  |  
  |             bool invalid_bracket_check(const lexer::token::token_type base, const lexer::token::token_type t) 
  |             { 
  |                if (details::is_right_bracket(static_cast<details::char_t>(base))) 
  |                { 
  |                   switch (t) 
  |                   { 
  |                      case lexer::token::e_assign : return (']' != base); 
  |                      case lexer::token::e_string : return (')' != base); 
  |                      default                     : return false; 
  |                   } 
  |                } 
  |                else if (details::is_left_bracket(static_cast<details::char_t>(base))) 
  |                { 
  |                   if (details::is_right_bracket(static_cast<details::char_t>(t))) 
  |                      return false; 
  |                   else if (details::is_left_bracket(static_cast<details::char_t>(t))) 
  |                      return false; 
  |                   else 
  |                   { 
  |                      switch (t) 
  |                      { 
  |                         case lexer::token::e_number  : return false; 
  |                         case lexer::token::e_symbol  : return false; 
  |                         case lexer::token::e_string  : return false; 
  |                         case lexer::token::e_add     : return false; 
  |                         case lexer::token::e_sub     : return false; 
  |                         case lexer::token::e_colon   : return false; 
  |                         case lexer::token::e_ternary : return false; 
  |                         default                      : return true ; 
  |                      } 
  |                   } 
  |                } 
  |                else if (details::is_right_bracket(static_cast<details::char_t>(t))) 
  |                { 
  |                   switch (base) 
  |                   { 
  |                      case lexer::token::e_number  : return false; 
  |                      case lexer::token::e_symbol  : return false; 
  |                      case lexer::token::e_string  : return false; 
  |                      case lexer::token::e_eof     : return false; 
  |                      case lexer::token::e_colon   : return false; 
  |                      case lexer::token::e_ternary : return false; 
  |                      default                      : return true ; 
  |                   } 
  |                } 
  |                else if (details::is_left_bracket(static_cast<details::char_t>(t))) 
  |                { 
  |                   switch (base) 
  |                   { 
  |                      case lexer::token::e_rbracket    : return true; 
  |                      case lexer::token::e_rsqrbracket : return true; 
  |                      case lexer::token::e_rcrlbracket : return true; 
  |                      default                          : return false; 
  |                   } 
  |                } 
  |  
  |                return false; 
  |             } 
  |  
  |             set_t invalid_comb_; 
  |             std::vector<std::pair<lexer::token,lexer::token> > error_list_; 
  |          }; 
  |  
  |          class sequence_validator_3tokens exprtk_final : public lexer::token_scanner 
  |          { 
  |          private: 
  |  
  |             typedef lexer::token::token_type token_t; 
  |             typedef std::pair<token_t,std::pair<token_t,token_t> > token_triplet_t; 
  |             typedef std::set<token_triplet_t> set_t; 
  |  
  |          public: 
  |  
  |             using lexer::token_scanner::operator(); 
  |  
  |             sequence_validator_3tokens() 
  |             : lexer::token_scanner(3) 
  |             { 
  |                add_invalid(lexer::token::e_number , lexer::token::e_number , lexer::token::e_number); 
  |                add_invalid(lexer::token::e_string , lexer::token::e_string , lexer::token::e_string); 
  |                add_invalid(lexer::token::e_comma  , lexer::token::e_comma  , lexer::token::e_comma ); 
  |  
  |                add_invalid(lexer::token::e_add    , lexer::token::e_add    , lexer::token::e_add   ); 
  |                add_invalid(lexer::token::e_sub    , lexer::token::e_sub    , lexer::token::e_sub   ); 
  |                add_invalid(lexer::token::e_div    , lexer::token::e_div    , lexer::token::e_div   ); 
  |                add_invalid(lexer::token::e_mul    , lexer::token::e_mul    , lexer::token::e_mul   ); 
  |                add_invalid(lexer::token::e_mod    , lexer::token::e_mod    , lexer::token::e_mod   ); 
  |                add_invalid(lexer::token::e_pow    , lexer::token::e_pow    , lexer::token::e_pow   ); 
  |  
  |                add_invalid(lexer::token::e_add    , lexer::token::e_sub    , lexer::token::e_add   ); 
  |                add_invalid(lexer::token::e_sub    , lexer::token::e_add    , lexer::token::e_sub   ); 
  |                add_invalid(lexer::token::e_div    , lexer::token::e_mul    , lexer::token::e_div   ); 
  |                add_invalid(lexer::token::e_mul    , lexer::token::e_div    , lexer::token::e_mul   ); 
  |                add_invalid(lexer::token::e_mod    , lexer::token::e_pow    , lexer::token::e_mod   ); 
  |                add_invalid(lexer::token::e_pow    , lexer::token::e_mod    , lexer::token::e_pow   ); 
  |             } 
  |  
  |             bool result() exprtk_override 
  |             { 
  |                return error_list_.empty(); 
  |             } 
  |  
  |             bool operator() (const lexer::token& t0, const lexer::token& t1, const lexer::token& t2) exprtk_override 
  |             { 
  |                const set_t::value_type p = std::make_pair(t0.type,std::make_pair(t1.type,t2.type)); 
  |  
  |                if (invalid_comb_.find(p) != invalid_comb_.end()) 
  |                { 
  |                   error_list_.push_back(std::make_pair(t0,t1)); 
  |                } 
  |  
  |                return true; 
  |             } 
  |  
  |             std::size_t error_count() const 
  |             { 
  |                return error_list_.size(); 
  |             } 
  |  
  |             std::pair<lexer::token,lexer::token> error(const std::size_t index) 
  |             { 
  |                if (index < error_list_.size()) 
  |                { 
  |                   return error_list_[index]; 
  |                } 
  |                else 
  |                { 
  |                   static const lexer::token error_token; 
  |                   return std::make_pair(error_token,error_token); 
  |                } 
  |             } 
  |  
  |             void clear_errors() 
  |             { 
  |                error_list_.clear(); 
  |             } 
  |  
  |          private: 
  |  
  |             void add_invalid(const token_t t0, const token_t t1, const token_t t2) 
  |             { 
  |                invalid_comb_.insert(std::make_pair(t0,std::make_pair(t1,t2))); 
  |             } 
  |  
  |             set_t invalid_comb_; 
  |             std::vector<std::pair<lexer::token,lexer::token> > error_list_; 
  |          }; 
  |  
  |          struct helper_assembly 
  |          { 
  |             inline bool register_scanner(lexer::token_scanner* scanner) 
  |             { 
  |                if (token_scanner_list.end() != std::find(token_scanner_list.begin(), 
  |                                                          token_scanner_list.end  (), 
  |                                                          scanner)) 
  |                { 
  |                   return false; 
  |                } 
  |  
  |                token_scanner_list.push_back(scanner); 
  |  
  |                return true; 
  |             } 
  |  
  |             inline bool register_modifier(lexer::token_modifier* modifier) 
  |             { 
  |                if (token_modifier_list.end() != std::find(token_modifier_list.begin(), 
  |                                                           token_modifier_list.end  (), 
  |                                                           modifier)) 
  |                { 
  |                   return false; 
  |                } 
  |  
  |                token_modifier_list.push_back(modifier); 
  |  
  |                return true; 
  |             } 
  |  
  |             inline bool register_joiner(lexer::token_joiner* joiner) 
  |             { 
  |                if (token_joiner_list.end() != std::find(token_joiner_list.begin(), 
  |                                                         token_joiner_list.end  (), 
  |                                                         joiner)) 
  |                { 
  |                   return false; 
  |                } 
  |  
  |                token_joiner_list.push_back(joiner); 
  |  
  |                return true; 
  |             } 
  |  
  |             inline bool register_inserter(lexer::token_inserter* inserter) 
  |             { 
  |                if (token_inserter_list.end() != std::find(token_inserter_list.begin(), 
  |                                                           token_inserter_list.end  (), 
  |                                                           inserter)) 
  |                { 
  |                   return false; 
  |                } 
  |  
  |                token_inserter_list.push_back(inserter); 
  |  
  |                return true; 
  |             } 
  |  
  |             inline bool run_modifiers(lexer::generator& g) 
  |             { 
  |                error_token_modifier = reinterpret_cast<lexer::token_modifier*>(0); 
  |  
  |                for (std::size_t i = 0; i < token_modifier_list.size(); ++i) 
  |                { 
  |                   lexer::token_modifier& modifier = (*token_modifier_list[i]); 
  |  
  |                   modifier.reset(); 
  |                   modifier.process(g); 
  |  
  |                   if (!modifier.result()) 
  |                   { 
  |                      error_token_modifier = token_modifier_list[i]; 
  |  
  |                      return false; 
  |                   } 
  |                } 
  |  
  |                return true; 
  |             } 
  |  
  |             inline bool run_joiners(lexer::generator& g) 
  |             { 
  |                error_token_joiner = reinterpret_cast<lexer::token_joiner*>(0); 
  |  
  |                for (std::size_t i = 0; i < token_joiner_list.size(); ++i) 
  |                { 
  |                   lexer::token_joiner& joiner = (*token_joiner_list[i]); 
  |  
  |                   joiner.reset(); 
  |                   joiner.process(g); 
  |  
  |                   if (!joiner.result()) 
  |                   { 
  |                      error_token_joiner = token_joiner_list[i]; 
  |  
  |                      return false; 
  |                   } 
  |                } 
  |  
  |                return true; 
  |             } 
  |  
  |             inline bool run_inserters(lexer::generator& g) 
  |             { 
  |                error_token_inserter = reinterpret_cast<lexer::token_inserter*>(0); 
  |  
  |                for (std::size_t i = 0; i < token_inserter_list.size(); ++i) 
  |                { 
  |                   lexer::token_inserter& inserter = (*token_inserter_list[i]); 
  |  
  |                   inserter.reset(); 
  |                   inserter.process(g); 
  |  
  |                   if (!inserter.result()) 
  |                   { 
  |                      error_token_inserter = token_inserter_list[i]; 
  |  
  |                      return false; 
  |                   } 
  |                } 
  |  
  |                return true; 
  |             } 
  |  
  |             inline bool run_scanners(lexer::generator& g) 
  |             { 
  |                error_token_scanner = reinterpret_cast<lexer::token_scanner*>(0); 
  |  
  |                for (std::size_t i = 0; i < token_scanner_list.size(); ++i) 
  |                { 
  |                   lexer::token_scanner& scanner = (*token_scanner_list[i]); 
  |  
  |                   scanner.reset(); 
  |                   scanner.process(g); 
  |  
  |                   if (!scanner.result()) 
  |                   { 
  |                      error_token_scanner = token_scanner_list[i]; 
  |  
  |                      return false; 
  |                   } 
  |                } 
  |  
  |                return true; 
  |             } 
  |  
  |             std::vector<lexer::token_scanner*>  token_scanner_list; 
  |             std::vector<lexer::token_modifier*> token_modifier_list; 
  |             std::vector<lexer::token_joiner*>   token_joiner_list; 
  |             std::vector<lexer::token_inserter*> token_inserter_list; 
  |  
  |             lexer::token_scanner*  error_token_scanner; 
  |             lexer::token_modifier* error_token_modifier; 
  |             lexer::token_joiner*   error_token_joiner; 
  |             lexer::token_inserter* error_token_inserter; 
  |          }; 
  |       } 
  |  
  |       class parser_helper 
  |       { 
  |       public: 
  |  
  |          typedef token     token_t; 
  |          typedef generator generator_t; 
  |  
  |          inline bool init(const std::string& str) 
  |          { 
  |             if (!lexer_.process(str)) 
  |             { 
  |                return false; 
  |             } 
  |  
  |             lexer_.begin(); 
  |  
  |             next_token(); 
  |  
  |             return true; 
  |          } 
  |  
  |          inline generator_t& lexer() 
  |          { 
  |             return lexer_; 
  |          } 
  |  
  |          inline const generator_t& lexer() const 
  |          { 
  |             return lexer_; 
  |          } 
  |  
  |          inline void store_token() 
  |          { 
  |             lexer_.store(); 
  |             store_current_token_ = current_token_; 
  |          } 
  |  
  |          inline void restore_token() 
  |          { 
  |             lexer_.restore(); 
  |             current_token_ = store_current_token_; 
  |          } 
  |  
  |          inline void next_token() 
  |          { 
  |             current_token_ = lexer_.next_token(); 
  |          } 
  |  
  |          inline const token_t& current_token() const 
  |          { 
  |             return current_token_; 
  |          } 
  |  
  |          inline const token_t& peek_next_token() 
  |          { 
  |             return lexer_.peek_next_token(); 
  |          } 
  |  
  |          enum token_advance_mode 
  |          { 
  |             e_hold    = 0, 
  |             e_advance = 1 
  |          }; 
  |  
  |          inline void advance_token(const token_advance_mode mode) 
  |          { 
  |             if (e_advance == mode) 
  |             { 
  |                next_token(); 
  |             } 
  |          } 
  |  
  |          inline bool token_is(const token_t::token_type& ttype, const token_advance_mode mode = e_advance) 
  |          { 
  |             if (current_token().type != ttype) 
  |             { 
  |                return false; 
  |             } 
  |  
  |             advance_token(mode); 
  |  
  |             return true; 
  |          } 
  |  
  |          inline bool token_is(const token_t::token_type& ttype, 
  |                               const std::string& value, 
  |                               const token_advance_mode mode = e_advance) 
  |          { 
  |             if ( 
  |                  (current_token().type != ttype) || 
  |                  !exprtk::details::imatch(value,current_token().value) 
  |                ) 
  |             { 
  |                return false; 
  |             } 
  |  
  |             advance_token(mode); 
  |  
  |             return true; 
  |          } 
  |  
  |          inline bool token_is(const std::string& value, 
  |                               const token_advance_mode mode = e_advance) 
  |          { 
  |             if (!exprtk::details::imatch(value,current_token().value)) 
  |             { 
  |                return false; 
  |             } 
  |  
  |             advance_token(mode); 
  |  
  |             return true; 
  |          } 
  |  
  |          inline bool token_is_arithmetic_opr(const token_advance_mode mode = e_advance) 
  |          { 
  |             switch (current_token().type) 
  |             { 
  |                case token_t::e_add : 
  |                case token_t::e_sub : 
  |                case token_t::e_div : 
  |                case token_t::e_mul : 
  |                case token_t::e_mod : 
  |                case token_t::e_pow : break; 
  |                default             : return false; 
  |             } 
  |  
  |             advance_token(mode); 
  |  
  |             return true; 
  |          } 
  |  
  |          inline bool token_is_ineq_opr(const token_advance_mode mode = e_advance) 
  |          { 
  |             switch (current_token().type) 
  |             { 
  |                case token_t::e_eq  : 
  |                case token_t::e_lte : 
  |                case token_t::e_ne  : 
  |                case token_t::e_gte : 
  |                case token_t::e_lt  : 
  |                case token_t::e_gt  : break; 
  |                default             : return false; 
  |             } 
  |  
  |             advance_token(mode); 
  |  
  |             return true; 
  |          } 
  |  
  |          inline bool token_is_left_bracket(const token_advance_mode mode = e_advance) 
  |          { 
  |             switch (current_token().type) 
  |             { 
  |                case token_t::e_lbracket    : 
  |                case token_t::e_lcrlbracket : 
  |                case token_t::e_lsqrbracket : break; 
  |                default                     : return false; 
  |             } 
  |  
  |             advance_token(mode); 
  |  
  |             return true; 
  |          } 
  |  
  |          inline bool token_is_right_bracket(const token_advance_mode mode = e_advance) 
  |          { 
  |             switch (current_token().type) 
  |             { 
  |                case token_t::e_rbracket    : 
  |                case token_t::e_rcrlbracket : 
  |                case token_t::e_rsqrbracket : break; 
  |                default                     : return false; 
  |             } 
  |  
  |             advance_token(mode); 
  |  
  |             return true; 
  |          } 
  |  
  |          inline bool token_is_bracket(const token_advance_mode mode = e_advance) 
  |          { 
  |             switch (current_token().type) 
  |             { 
  |                case token_t::e_rbracket    : 
  |                case token_t::e_rcrlbracket : 
  |                case token_t::e_rsqrbracket : 
  |                case token_t::e_lbracket    : 
  |                case token_t::e_lcrlbracket : 
  |                case token_t::e_lsqrbracket : break; 
  |                default                     : return false; 
  |             } 
  |  
  |             advance_token(mode); 
  |  
  |             return true; 
  |          } 
  |  
  |          inline bool token_is_loop(const token_advance_mode mode = e_advance) 
  |          { 
  |             return token_is("for"   , mode) || 
  |                    token_is("while" , mode) || 
  |                    token_is("repeat", mode) ; 
  |          } 
  |  
  |          inline bool peek_token_is(const token_t::token_type& ttype) 
  |          { 
  |             return (lexer_.peek_next_token().type == ttype); 
  |          } 
  |  
  |          inline bool peek_token_is(const std::string& s) 
  |          { 
  |             return (exprtk::details::imatch(lexer_.peek_next_token().value,s)); 
  |          } 
  |  
  |       private: 
  |  
  |          generator_t lexer_; 
  |          token_t     current_token_; 
  |          token_t     store_current_token_; 
  |       }; 
  |    } 
  |  
  |    template <typename T> 
  |    class vector_view 
  |    { 
  |    public: 
  |  
  |       typedef T* data_ptr_t; 
  |  
  |       vector_view(data_ptr_t data, const std::size_t& size) 
  |       : base_size_(size) 
  |       , size_(size) 
  |       , data_(data) 
  |       , data_ref_(0) 
  |       { 
  |          assert(size_ > 0); 
  |       } 
  |  
  |       vector_view(const vector_view<T>& vv) 
  |       : base_size_(vv.base_size_) 
  |       , size_(vv.size_) 
  |       , data_(vv.data_) 
  |       , data_ref_(0) 
  |       { 
  |          assert(size_ > 0); 
  |       } 
  |  
  |       inline void rebase(data_ptr_t data) 
  |       { 
  |          data_ = data; 
  |  
  |          if (!data_ref_.empty()) 
  |          { 
  |             for (std::size_t i = 0; i < data_ref_.size(); ++i) 
  |             { 
  |                (*data_ref_[i]) = data; 
  |             } 
  |          } 
  |       } 
  |  
  |       inline data_ptr_t data() const 
  |       { 
  |          return data_; 
  |       } 
  |  
  |       inline std::size_t base_size() const 
  |       { 
  |          return base_size_; 
  |       } 
  |  
  |       inline std::size_t size() const 
  |       { 
  |          return size_; 
  |       } 
  |  
  |       inline const T& operator[](const std::size_t index) const 
  |       { 
  |          assert(index < size_); 
  |          return data_[index]; 
  |       } 
  |  
  |       inline T& operator[](const std::size_t index) 
  |       { 
  |          assert(index < size_); 
  |          return data_[index]; 
  |       } 
  |  
  |       void set_ref(data_ptr_t* data_ref) 
  |       { 
  |          data_ref_.push_back(data_ref); 
  |          exprtk_debug(("vector_view::set_ref() - data_ref: %p data_ref_.size(): %d\n", 
  |                        reinterpret_cast<void*>(data_ref), 
  |                        static_cast<int>(data_ref_.size()))); 
  |       } 
  |  
  |       void remove_ref(data_ptr_t* data_ref) 
  |       { 
  |          data_ref_.erase( 
  |             std::remove(data_ref_.begin(), data_ref_.end(), data_ref), 
  |             data_ref_.end()); 
  |          exprtk_debug(("vector_view::remove_ref() - data_ref: %p data_ref_.size(): %d\n", 
  |                        reinterpret_cast<void*>(data_ref), 
  |                        static_cast<int>(data_ref_.size()))); 
  |       } 
  |  
  |       bool set_size(const std::size_t new_size) 
  |       { 
  |          if ((new_size > 0) && (new_size <= base_size_)) 
  |          { 
  |             size_ = new_size; 
  |             exprtk_debug(("vector_view::set_size() - data_: %p size: %lu\n", 
  |                           reinterpret_cast<void*>(data_), 
  |                           size_)); 
  |             return true; 
  |          } 
  |  
  |          exprtk_debug(("vector_view::set_size() - error invalid new_size: %lu  base_size: %lu\n", 
  |                        new_size, 
  |                        base_size_)); 
  |          return false; 
  |       } 
  |  
  |    private: 
  |  
  |       const std::size_t base_size_; 
  |       std::size_t size_; 
  |       data_ptr_t  data_; 
  |       std::vector<data_ptr_t*> data_ref_; 
  |    }; 
  |  
  |    template <typename T> 
  |    inline vector_view<T> make_vector_view(T* data, 
  |                                           const std::size_t size, const std::size_t offset = 0) 
  |    { 
  |       return vector_view<T>(data + offset, size); 
  |    } 
  |  
  |    template <typename T> 
  |    inline vector_view<T> make_vector_view(std::vector<T>& v, 
  |                                           const std::size_t size, const std::size_t offset = 0) 
  |    { 
  |       return vector_view<T>(v.data() + offset, size); 
  |    } 
  |  
  |    template <typename T> class results_context; 
  |  
  |    template <typename T> 
  |    struct type_store 
  |    { 
  |       enum store_type 
  |       { 
  |          e_unknown, 
  |          e_scalar , 
  |          e_vector , 
  |          e_string 
  |       }; 
  |  
  |       type_store() 
  |       : data(0) 
  |       , size(0) 
  |       , type(e_unknown) 
  |       {} 
  |  
  |       union 
  |       { 
  |          void* data; 
  |          T*    vec_data; 
  |       }; 
  |  
  |       std::size_t size; 
  |       store_type  type; 
  |  
  |       class parameter_list 
  |       { 
  |       public: 
  |  
  |          explicit parameter_list(std::vector<type_store>& pl) 
  |          : parameter_list_(pl) 
  |          {} 
  |  
  |          inline bool empty() const 
  |          { 
  |             return parameter_list_.empty(); 
  |          } 
  |  
  |          inline std::size_t size() const 
  |          { 
  |             return parameter_list_.size(); 
  |          } 
  |  
  |          inline type_store& operator[](const std::size_t& index) 
  |          { 
  |             return parameter_list_[index]; 
  |          } 
  |  
  |          inline const type_store& operator[](const std::size_t& index) const 
  |          { 
  |             return parameter_list_[index]; 
  |          } 
  |  
  |          inline type_store& front() 
  |          { 
  |             return parameter_list_[0]; 
  |          } 
  |  
  |          inline const type_store& front() const 
  |          { 
  |             return parameter_list_[0]; 
  |          } 
  |  
  |          inline type_store& back() 
  |          { 
  |             return parameter_list_.back(); 
  |          } 
  |  
  |          inline const type_store& back() const 
  |          { 
  |             return parameter_list_.back(); 
  |          } 
  |  
  |       private: 
  |  
  |          std::vector<type_store>& parameter_list_; 
  |  
  |          friend class results_context<T>; 
  |       }; 
  |  
  |       template <typename ViewType> 
  |       struct type_view 
  |       { 
  |          typedef type_store<T> type_store_t; 
  |          typedef ViewType      value_t; 
  |  
  |          explicit type_view(type_store_t& ts) 
  |          : ts_(ts) 
  |          , data_(reinterpret_cast<value_t*>(ts_.data)) 
  |          {} 
  |  
  |          explicit type_view(const type_store_t& ts) 
  |          : ts_(const_cast<type_store_t&>(ts)) 
  |          , data_(reinterpret_cast<value_t*>(ts_.data)) 
  |          {} 
  |  
  |          inline std::size_t size() const 
  |          { 
  |             return ts_.size; 
  |          } 
  |  
  |          inline value_t& operator[](const std::size_t& i) 
  |          { 
  |             return data_[i]; 
  |          } 
  |  
  |          inline const value_t& operator[](const std::size_t& i) const 
  |          { 
  |             return data_[i]; 
  |          } 
  |  
  |          inline const value_t* begin() const { return data_; } 
  |          inline       value_t* begin()       { return data_; } 
  |  
  |          inline const value_t* end() const 
  |          { 
  |             return static_cast<value_t*>(data_ + ts_.size); 
  |          } 
  |  
  |          inline value_t* end() 
  |          { 
  |             return static_cast<value_t*>(data_ + ts_.size); 
  |          } 
  |  
  |          type_store_t& ts_; 
  |          value_t* data_; 
  |       }; 
  |  
  |       typedef type_view<T>    vector_view; 
  |       typedef type_view<char> string_view; 
  |  
  |       struct scalar_view 
  |       { 
  |          typedef type_store<T> type_store_t; 
  |          typedef T value_t; 
  |  
  |          explicit scalar_view(type_store_t& ts) 
  |          : v_(*reinterpret_cast<value_t*>(ts.data)) 
  |          {} 
  |  
  |          explicit scalar_view(const type_store_t& ts) 
  |          : v_(*reinterpret_cast<value_t*>(const_cast<type_store_t&>(ts).data)) 
  |          {} 
  |  
  |          inline value_t& operator() () 
  |          { 
  |             return v_; 
  |          } 
  |  
  |          inline const value_t& operator() () const 
  |          { 
  |             return v_; 
  |          } 
  |  
  |          inline operator value_t() const 
  |          { 
  |             return v_; 
  |          } 
  |  
  |          inline operator value_t() 
  |          { 
  |             return v_; 
  |          } 
  |  
  |          template <typename IntType> 
  |          inline bool to_int(IntType& i) const 
  |          { 
  |             if (!exprtk::details::numeric::is_integer(v_)) 
  |                return false; 
  |  
  |             i = static_cast<IntType>(v_); 
  |  
  |             return true; 
  |          } 
  |  
  |          template <typename UIntType> 
  |          inline bool to_uint(UIntType& u) const 
  |          { 
  |             if (v_ < T(0)) 
  |                return false; 
  |             else if (!exprtk::details::numeric::is_integer(v_)) 
  |                return false; 
  |  
  |             u = static_cast<UIntType>(v_); 
  |  
  |             return true; 
  |          } 
  |  
  |          T& v_; 
  |       }; 
  |    }; 
  |  
  |    template <typename StringView> 
  |    inline std::string to_str(const StringView& view) 
  |    { 
  |       return std::string(view.begin(),view.size()); 
  |    } 
  |  
  |    #ifndef exprtk_disable_return_statement 
  |    namespace details 
  |    { 
  |       template <typename T> class return_node; 
  |       template <typename T> class return_envelope_node; 
  |    } 
  |    #endif 
  |  
  |    template <typename T> 
  |    class results_context 
  |    { 
  |    public: 
  |  
  |       typedef type_store<T> type_store_t; 
  |       typedef typename type_store_t::scalar_view scalar_t; 
  |       typedef typename type_store_t::vector_view vector_t; 
  |       typedef typename type_store_t::string_view string_t; 
  |  
  |       results_context() 
  |       : results_available_(false) 
  |       {} 
  |  
  |       inline std::size_t count() const 
  |       { 
  |          if (results_available_) 
  |             return parameter_list_.size(); 
  |          else 
  |             return 0; 
  |       } 
  |  
  |       inline type_store_t& operator[](const std::size_t& index) 
  |       { 
  |          return parameter_list_[index]; 
  |       } 
  |  
  |       inline const type_store_t& operator[](const std::size_t& index) const 
  |       { 
  |          return parameter_list_[index]; 
  |       } 
  |  
  |       inline bool get_scalar(const std::size_t& index, T& out) const 
  |       { 
  |          if ( 
  |               (index < parameter_list_.size()) && 
  |               (parameter_list_[index].type == type_store_t::e_scalar) 
  |             ) 
  |          { 
  |             const scalar_t scalar(parameter_list_[index]); 
  |             out = scalar(); 
  |             return true; 
  |          } 
  |  
  |          return false; 
  |       } 
  |  
  |       template <typename OutputIterator> 
  |       inline bool get_vector(const std::size_t& index, OutputIterator out_itr) const 
  |       { 
  |          if ( 
  |               (index < parameter_list_.size()) && 
  |               (parameter_list_[index].type == type_store_t::e_vector) 
  |             ) 
  |          { 
  |             const vector_t vector(parameter_list_[index]); 
  |             for (std::size_t i = 0; i < vector.size(); ++i) 
  |             { 
  |                *(out_itr++) = vector[i]; 
  |             } 
  |  
  |             return true; 
  |          } 
  |  
  |          return false; 
  |       } 
  |  
  |       inline bool get_vector(const std::size_t& index, std::vector<T>& out) const 
  |       { 
  |          return get_vector(index,std::back_inserter(out)); 
  |       } 
  |  
  |       inline bool get_string(const std::size_t& index, std::string& out) const 
  |       { 
  |          if ( 
  |               (index < parameter_list_.size()) && 
  |               (parameter_list_[index].type == type_store_t::e_string) 
  |             ) 
  |          { 
  |             const string_t str(parameter_list_[index]); 
  |             out.assign(str.begin(),str.size()); 
  |             return true; 
  |          } 
  |  
  |          return false; 
  |       } 
  |  
  |    private: 
  |  
  |       inline void clear() 
  |       { 
  |          results_available_ = false; 
  |       } 
  |  
  |       typedef std::vector<type_store_t> ts_list_t; 
  |       typedef typename type_store_t::parameter_list parameter_list_t; 
  |  
  |       inline void assign(const parameter_list_t& pl) 
  |       { 
  |          parameter_list_    = pl.parameter_list_; 
  |          results_available_ = true; 
  |       } 
  |  
  |       bool results_available_; 
  |       ts_list_t parameter_list_; 
  |  
  |       #ifndef exprtk_disable_return_statement 
  |       friend class details::return_node<T>; 
  |       friend class details::return_envelope_node<T>; 
  |       #endif 
  |    }; 
  |  
  |    namespace details 
  |    { 
  |       enum operator_type 
  |       { 
  |          e_default , e_null    , e_add     , e_sub     , 
  |          e_mul     , e_div     , e_mod     , e_pow     , 
  |          e_atan2   , e_min     , e_max     , e_avg     , 
  |          e_sum     , e_prod    , e_lt      , e_lte     , 
  |          e_eq      , e_equal   , e_ne      , e_nequal  , 
  |          e_gte     , e_gt      , e_and     , e_nand    , 
  |          e_or      , e_nor     , e_xor     , e_xnor    , 
  |          e_mand    , e_mor     , e_scand   , e_scor    , 
  |          e_shr     , e_shl     , e_abs     , e_acos    , 
  |          e_acosh   , e_asin    , e_asinh   , e_atan    , 
  |          e_atanh   , e_ceil    , e_cos     , e_cosh    , 
  |          e_exp     , e_expm1   , e_floor   , e_log     , 
  |          e_log10   , e_log2    , e_log1p   , e_logn    , 
  |          e_neg     , e_pos     , e_round   , e_roundn  , 
  |          e_root    , e_sqrt    , e_sin     , e_sinc    , 
  |          e_sinh    , e_sec     , e_csc     , e_tan     , 
  |          e_tanh    , e_cot     , e_clamp   , e_iclamp  , 
  |          e_inrange , e_sgn     , e_r2d     , e_d2r     , 
  |          e_d2g     , e_g2d     , e_hypot   , e_notl    , 
  |          e_erf     , e_erfc    , e_ncdf    , e_frac    , 
  |          e_trunc   , e_assign  , e_addass  , e_subass  , 
  |          e_mulass  , e_divass  , e_modass  , e_in      , 
  |          e_like    , e_ilike   , e_multi   , e_smulti  , 
  |          e_swap    , 
  |  
  |          // Do not add new functions/operators after this point. 
  |          e_sf00 = 1000, e_sf01 = 1001, e_sf02 = 1002, e_sf03 = 1003, 
  |          e_sf04 = 1004, e_sf05 = 1005, e_sf06 = 1006, e_sf07 = 1007, 
  |          e_sf08 = 1008, e_sf09 = 1009, e_sf10 = 1010, e_sf11 = 1011, 
  |          e_sf12 = 1012, e_sf13 = 1013, e_sf14 = 1014, e_sf15 = 1015, 
  |          e_sf16 = 1016, e_sf17 = 1017, e_sf18 = 1018, e_sf19 = 1019, 
  |          e_sf20 = 1020, e_sf21 = 1021, e_sf22 = 1022, e_sf23 = 1023, 
  |          e_sf24 = 1024, e_sf25 = 1025, e_sf26 = 1026, e_sf27 = 1027, 
  |          e_sf28 = 1028, e_sf29 = 1029, e_sf30 = 1030, e_sf31 = 1031, 
  |          e_sf32 = 1032, e_sf33 = 1033, e_sf34 = 1034, e_sf35 = 1035, 
  |          e_sf36 = 1036, e_sf37 = 1037, e_sf38 = 1038, e_sf39 = 1039, 
  |          e_sf40 = 1040, e_sf41 = 1041, e_sf42 = 1042, e_sf43 = 1043, 
  |          e_sf44 = 1044, e_sf45 = 1045, e_sf46 = 1046, e_sf47 = 1047, 
  |          e_sf48 = 1048, e_sf49 = 1049, e_sf50 = 1050, e_sf51 = 1051, 
  |          e_sf52 = 1052, e_sf53 = 1053, e_sf54 = 1054, e_sf55 = 1055, 
  |          e_sf56 = 1056, e_sf57 = 1057, e_sf58 = 1058, e_sf59 = 1059, 
  |          e_sf60 = 1060, e_sf61 = 1061, e_sf62 = 1062, e_sf63 = 1063, 
  |          e_sf64 = 1064, e_sf65 = 1065, e_sf66 = 1066, e_sf67 = 1067, 
  |          e_sf68 = 1068, e_sf69 = 1069, e_sf70 = 1070, e_sf71 = 1071, 
  |          e_sf72 = 1072, e_sf73 = 1073, e_sf74 = 1074, e_sf75 = 1075, 
  |          e_sf76 = 1076, e_sf77 = 1077, e_sf78 = 1078, e_sf79 = 1079, 
  |          e_sf80 = 1080, e_sf81 = 1081, e_sf82 = 1082, e_sf83 = 1083, 
  |          e_sf84 = 1084, e_sf85 = 1085, e_sf86 = 1086, e_sf87 = 1087, 
  |          e_sf88 = 1088, e_sf89 = 1089, e_sf90 = 1090, e_sf91 = 1091, 
  |          e_sf92 = 1092, e_sf93 = 1093, e_sf94 = 1094, e_sf95 = 1095, 
  |          e_sf96 = 1096, e_sf97 = 1097, e_sf98 = 1098, e_sf99 = 1099, 
  |          e_sffinal  = 1100, 
  |          e_sf4ext00 = 2000, e_sf4ext01 = 2001, e_sf4ext02 = 2002, e_sf4ext03 = 2003, 
  |          e_sf4ext04 = 2004, e_sf4ext05 = 2005, e_sf4ext06 = 2006, e_sf4ext07 = 2007, 
  |          e_sf4ext08 = 2008, e_sf4ext09 = 2009, e_sf4ext10 = 2010, e_sf4ext11 = 2011, 
  |          e_sf4ext12 = 2012, e_sf4ext13 = 2013, e_sf4ext14 = 2014, e_sf4ext15 = 2015, 
  |          e_sf4ext16 = 2016, e_sf4ext17 = 2017, e_sf4ext18 = 2018, e_sf4ext19 = 2019, 
  |          e_sf4ext20 = 2020, e_sf4ext21 = 2021, e_sf4ext22 = 2022, e_sf4ext23 = 2023, 
  |          e_sf4ext24 = 2024, e_sf4ext25 = 2025, e_sf4ext26 = 2026, e_sf4ext27 = 2027, 
  |          e_sf4ext28 = 2028, e_sf4ext29 = 2029, e_sf4ext30 = 2030, e_sf4ext31 = 2031, 
  |          e_sf4ext32 = 2032, e_sf4ext33 = 2033, e_sf4ext34 = 2034, e_sf4ext35 = 2035, 
  |          e_sf4ext36 = 2036, e_sf4ext37 = 2037, e_sf4ext38 = 2038, e_sf4ext39 = 2039, 
  |          e_sf4ext40 = 2040, e_sf4ext41 = 2041, e_sf4ext42 = 2042, e_sf4ext43 = 2043, 
  |          e_sf4ext44 = 2044, e_sf4ext45 = 2045, e_sf4ext46 = 2046, e_sf4ext47 = 2047, 
  |          e_sf4ext48 = 2048, e_sf4ext49 = 2049, e_sf4ext50 = 2050, e_sf4ext51 = 2051, 
  |          e_sf4ext52 = 2052, e_sf4ext53 = 2053, e_sf4ext54 = 2054, e_sf4ext55 = 2055, 
  |          e_sf4ext56 = 2056, e_sf4ext57 = 2057, e_sf4ext58 = 2058, e_sf4ext59 = 2059, 
  |          e_sf4ext60 = 2060, e_sf4ext61 = 2061 
  |       }; 
  |  
  |       inline std::string to_str(const operator_type opr) 
  |       { 
  |          switch (opr) 
  |          { 
  |             case e_add    : return  "+"  ; 
  |             case e_sub    : return  "-"  ; 
  |             case e_mul    : return  "*"  ; 
  |             case e_div    : return  "/"  ; 
  |             case e_mod    : return  "%"  ; 
  |             case e_pow    : return  "^"  ; 
  |             case e_assign : return ":="  ; 
  |             case e_addass : return "+="  ; 
  |             case e_subass : return "-="  ; 
  |             case e_mulass : return "*="  ; 
  |             case e_divass : return "/="  ; 
  |             case e_modass : return "%="  ; 
  |             case e_lt     : return  "<"  ; 
  |             case e_lte    : return "<="  ; 
  |             case e_eq     : return "=="  ; 
  |             case e_equal  : return  "="  ; 
  |             case e_ne     : return "!="  ; 
  |             case e_nequal : return "<>"  ; 
  |             case e_gte    : return ">="  ; 
  |             case e_gt     : return  ">"  ; 
  |             case e_and    : return "and" ; 
  |             case e_or     : return "or"  ; 
  |             case e_xor    : return "xor" ; 
  |             case e_nand   : return "nand" 
  |             case e_nor    : return "nor" ; 
  |             case e_xnor   : return "xnor" 
  |             default       : return "N/A" ; 
  |          } 
  |       } 
  |  
  |       struct base_operation_t 
  |       { 
  |          base_operation_t(const operator_type t, const unsigned int& np) 
  |          : type(t) 
  |          , num_params(np) 
  |          {} 
  |  
  |          operator_type type; 
  |          unsigned int num_params; 
  |       }; 
  |  
  |       namespace loop_unroll 
  |       { 
  |          const unsigned int global_loop_batch_size = 
  |          #ifndef exprtk_disable_superscalar_unroll 
  |          16; 
  |          #else 
  |           4; 
  |          #endif 
  |  
  |          struct details 
  |          { 
  |             explicit details(const std::size_t& vsize, 
  |                              const unsigned int loop_batch_size = global_loop_batch_size) 
  |             : batch_size(loop_batch_size   ) 
  |             , remainder (vsize % batch_size) 
  |             , upper_bound(static_cast<int>(vsize - (remainder ? loop_batch_size : 0))) 
  |             {} 
  |  
  |             unsigned int batch_size; 
  |             int remainder; 
  |             int upper_bound; 
  |          }; 
  |       } 
  |  
  |       #ifdef exprtk_enable_debugging 
  |       inline void dump_ptr(const std::string& s, const void* ptr, const std::size_t size = 0) 
  |       { 
  |          if (size) 
  |             exprtk_debug(("%s - addr: %p size: %d\n", 
  |                           s.c_str(), 
  |                           ptr, 
  |                           static_cast<unsigned int>(size))); 
  |          else 
  |             exprtk_debug(("%s - addr: %p\n", s.c_str(), ptr)); 
  |       } 
  |  
  |       template <typename T> 
  |       inline void dump_vector(const std::string& vec_name, const T* data, const std::size_t size) 
  |       { 
  |          printf("----- %s (%p) -----\n", 
  |                 vec_name.c_str(), 
  |                 static_cast<const void*>(data)); 
  |          printf("[ "); 
  |          for (std::size_t i = 0; i <  size; ++i) 
  |          { 
  |             printf("%8.3f\t", data[i]); 
  |          } 
  |          printf(" ]\n"); 
  |          printf("---------------------\n"); 
  |       } 
  |       #else 
  |       inline void dump_ptr(const std::string&, const void*) {} 
  |       inline void dump_ptr(const std::string&, const void*, const std::size_t) {} 
  |       template <typename T> 
  |       inline void dump_vector(const std::string&, const T*, const std::size_t) {} 
  |       #endif 
  |  
  |       template <typename T> 
  |       class vec_data_store 
  |       { 
  |       public: 
  |  
  |          typedef vec_data_store<T> type; 
  |          typedef T* data_t; 
  |  
  |       private: 
  |  
  |          struct control_block 
  |          { 
  |             control_block() 
  |             : ref_count(1) 
  |             , size     (0) 
  |             , data     (0) 
  |             , destruct (true) 
  |             {} 
  |  
  |             explicit control_block(const std::size_t& dsize) 
  |             : ref_count(1    ) 
  |             , size     (dsize) 
  |             , data     (0    ) 
  |             , destruct (true ) 
  |             { create_data(); } 
  |  
  |             control_block(const std::size_t& dsize, data_t dptr, bool dstrct = false) 
  |             : ref_count(1     ) 
  |             , size     (dsize ) 
  |             , data     (dptr  ) 
  |             , destruct (dstrct) 
  |             {} 
  |  
  |            ~control_block() 
  |             { 
  |                if (data && destruct && (0 == ref_count)) 
  |                { 
  |                   dump_ptr("~vec_data_store::control_block() data",data); 
  |                   delete[] data; 
  |                   data = reinterpret_cast<data_t>(0); 
  |                } 
  |             } 
  |  
  |             static inline control_block* create(const std::size_t& dsize, data_t data_ptr = data_t(0), bool dstrct = false) 
  |             { 
  |                if (dsize) 
  |                { 
  |                   if (0 == data_ptr) 
  |                      return (new control_block(dsize)); 
  |                   else 
  |                      return (new control_block(dsize, data_ptr, dstrct)); 
  |                } 
  |                else 
  |                   return (new control_block); 
  |             } 
  |  
  |             static inline void destroy(control_block*& cntrl_blck) 
  |             { 
  |                if (cntrl_blck) 
  |                { 
  |                   if ( 
  |                        (0 !=   cntrl_blck->ref_count) && 
  |                        (0 == --cntrl_blck->ref_count) 
  |                      ) 
  |                   { 
  |                      delete cntrl_blck; 
  |                   } 
  |  
  |                   cntrl_blck = 0; 
  |                } 
  |             } 
  |  
  |             std::size_t ref_count; 
  |             std::size_t size; 
  |             data_t      data; 
  |             bool        destruct; 
  |  
  |          private: 
  |  
  |             control_block(const control_block&) exprtk_delete; 
  |             control_block& operator=(const control_block&) exprtk_delete; 
  |  
  |             inline void create_data() 
  |             { 
  |                destruct = true; 
  |                data     = new T[size]; 
  |                std::fill_n(data, size, T(0)); 
  |                dump_ptr("control_block::create_data() - data", data, size); 
  |             } 
  |          }; 
  |  
  |       public: 
  |  
  |          vec_data_store() 
  |          : control_block_(control_block::create(0)) 
  |          {} 
  |  
  |          explicit vec_data_store(const std::size_t& size) 
  |          : control_block_(control_block::create(size,reinterpret_cast<data_t>(0),true)) 
  |          {} 
  |  
  |          vec_data_store(const std::size_t& size, data_t data, bool dstrct = false) 
  |          : control_block_(control_block::create(size, data, dstrct)) 
  |          {} 
  |  
  |          vec_data_store(const type& vds) 
  |          { 
  |             control_block_ = vds.control_block_; 
  |             control_block_->ref_count++; 
  |          } 
  |  
  |         ~vec_data_store() 
  |          { 
  |             control_block::destroy(control_block_); 
  |          } 
  |  
  |          type& operator=(const type& vds) 
  |          { 
  |             if (this != &vds) 
  |             { 
  |                const std::size_t final_size = min_size(control_block_, vds.control_block_); 
  |  
  |                vds.control_block_->size = final_size; 
  |                    control_block_->size = final_size; 
  |  
  |                if (control_block_->destruct || (0 == control_block_->data)) 
  |                { 
  |                   control_block::destroy(control_block_); 
  |  
  |                   control_block_ = vds.control_block_; 
  |                   control_block_->ref_count++; 
  |                } 
  |             } 
  |  
  |             return (*this); 
  |          } 
  |  
  |          inline data_t data() 
  |          { 
  |             return control_block_->data; 
  |          } 
  |  
  |          inline data_t data() const 
  |          { 
  |             return control_block_->data; 
  |          } 
  |  
  |          inline std::size_t size() const 
  |          { 
  |             return control_block_->size; 
  |          } 
  |  
  |          inline data_t& ref() 
  |          { 
  |             return control_block_->data; 
  |          } 
  |  
  |          inline void dump() const 
  |          { 
  |             #ifdef exprtk_enable_debugging 
  |             exprtk_debug(("size: %d\taddress:%p\tdestruct:%c\n", 
  |                           size(), 
  |                           data(), 
  |                           (control_block_->destruct ? 'T' : 'F'))); 
  |  
  |             for (std::size_t i = 0; i < size(); ++i) 
  |             { 
  |                if (5 == i) 
  |                   exprtk_debug(("\n")); 
  |  
  |                exprtk_debug(("%15.10f ", data()[i])); 
  |             } 
  |             exprtk_debug(("\n")); 
  |             #endif 
  |          } 
  |  
  |          static inline void match_sizes(type& vds0, type& vds1) 
  |          { 
  |             const std::size_t size = min_size(vds0.control_block_,vds1.control_block_); 
  |             vds0.control_block_->size = size; 
  |             vds1.control_block_->size = size; 
  |          } 
  |  
  |       private: 
  |  
  |          static inline std::size_t min_size(const control_block* cb0, const control_block* cb1) 
  |          { 
  |             const std::size_t size0 = cb0->size; 
  |             const std::size_t size1 = cb1->size; 
  |  
  |             if (size0 && size1) 
  |                return std::min(size0,size1); 
  |             else 
  |                return (size0) ? size0 : size1; 
  |          } 
  |  
  |          control_block* control_block_; 
  |       }; 
  |  
  |       namespace numeric 
  |       { 
  |          namespace details 
  |          { 
  |             template <typename T> 
  |             inline T process_impl(const operator_type operation, const T arg) 
  |             { 
  |                switch (operation) 
  |                { 
  |                   case e_abs   : return numeric::abs  (arg); 
  |                   case e_acos  : return numeric::acos (arg); 
  |                   case e_acosh : return numeric::acosh(arg); 
  |                   case e_asin  : return numeric::asin (arg); 
  |                   case e_asinh : return numeric::asinh(arg); 
  |                   case e_atan  : return numeric::atan (arg); 
  |                   case e_atanh : return numeric::atanh(arg); 
  |                   case e_ceil  : return numeric::ceil (arg); 
  |                   case e_cos   : return numeric::cos  (arg); 
  |                   case e_cosh  : return numeric::cosh (arg); 
  |                   case e_exp   : return numeric::exp  (arg); 
  |                   case e_expm1 : return numeric::expm1(arg); 
  |                   case e_floor : return numeric::floor(arg); 
  |                   case e_log   : return numeric::log  (arg); 
  |                   case e_log10 : return numeric::log10(arg); 
  |                   case e_log2  : return numeric::log2 (arg); 
  |                   case e_log1p : return numeric::log1p(arg); 
  |                   case e_neg   : return numeric::neg  (arg); 
  |                   case e_pos   : return numeric::pos  (arg); 
  |                   case e_round : return numeric::round(arg); 
  |                   case e_sin   : return numeric::sin  (arg); 
  |                   case e_sinc  : return numeric::sinc (arg); 
  |                   case e_sinh  : return numeric::sinh (arg); 
  |                   case e_sqrt  : return numeric::sqrt (arg); 
  |                   case e_tan   : return numeric::tan  (arg); 
  |                   case e_tanh  : return numeric::tanh (arg); 
  |                   case e_cot   : return numeric::cot  (arg); 
  |                   case e_sec   : return numeric::sec  (arg); 
  |                   case e_csc   : return numeric::csc  (arg); 
  |                   case e_r2d   : return numeric::r2d  (arg); 
  |                   case e_d2r   : return numeric::d2r  (arg); 
  |                   case e_d2g   : return numeric::d2g  (arg); 
  |                   case e_g2d   : return numeric::g2d  (arg); 
  |                   case e_notl  : return numeric::notl (arg); 
  |                   case e_sgn   : return numeric::sgn  (arg); 
  |                   case e_erf   : return numeric::erf  (arg); 
  |                   case e_erfc  : return numeric::erfc (arg); 
  |                   case e_ncdf  : return numeric::ncdf (arg); 
  |                   case e_frac  : return numeric::frac (arg); 
  |                   case e_trunc : return numeric::trunc(arg); 
  |  
  |                   default      : exprtk_debug(("numeric::details::process_impl<T> - Invalid unary operation.\n")); 
  |                                  return std::numeric_limits<T>::quiet_NaN(); 
  |                } 
  |             } 
  |  
  |             template <typename T> 
  |             inline T process_impl(const operator_type operation, const T arg0, const T arg1) 
  |             { 
  |                switch (operation) 
  |                { 
  |                   case e_add    : return (arg0 + arg1); 
  |                   case e_sub    : return (arg0 - arg1); 
  |                   case e_mul    : return (arg0 * arg1); 
  |                   case e_div    : return (arg0 / arg1); 
  |                   case e_mod    : return modulus<T>(arg0,arg1); 
  |                   case e_pow    : return pow<T>(arg0,arg1); 
  |                   case e_atan2  : return atan2<T>(arg0,arg1); 
  |                   case e_min    : return std::min<T>(arg0,arg1); 
  |                   case e_max    : return std::max<T>(arg0,arg1); 
  |                   case e_logn   : return logn<T>(arg0,arg1); 
  |                   case e_lt     : return (arg0 <  arg1) ? T(1) : T(0); 
  |                   case e_lte    : return (arg0 <= arg1) ? T(1) : T(0); 
  |                   case e_eq     : return std::equal_to<T>()(arg0,arg1) ? T(1) : T(0); 
  |                   case e_ne     : return std::not_equal_to<T>()(arg0,arg1) ? T(1) : T(0); 
  |                   case e_gte    : return (arg0 >= arg1) ? T(1) : T(0); 
  |                   case e_gt     : return (arg0 >  arg1) ? T(1) : T(0); 
  |                   case e_and    : return and_opr <T>(arg0,arg1); 
  |                   case e_nand   : return nand_opr<T>(arg0,arg1); 
  |                   case e_or     : return or_opr  <T>(arg0,arg1); 
  |                   case e_nor    : return nor_opr <T>(arg0,arg1); 
  |                   case e_xor    : return xor_opr <T>(arg0,arg1); 
  |                   case e_xnor   : return xnor_opr<T>(arg0,arg1); 
  |                   case e_root   : return root    <T>(arg0,arg1); 
  |                   case e_roundn : return roundn  <T>(arg0,arg1); 
  |                   case e_equal  : return equal   <T>(arg0,arg1); 
  |                   case e_nequal : return nequal  <T>(arg0,arg1); 
  |                   case e_hypot  : return hypot   <T>(arg0,arg1); 
  |                   case e_shr    : return shr     <T>(arg0,arg1); 
  |                   case e_shl    : return shl     <T>(arg0,arg1); 
  |  
  |                   default       : exprtk_debug(("numeric::details::process_impl<T> - Invalid binary operation.\n")); 
  |                                   return std::numeric_limits<T>::quiet_NaN(); 
  |                } 
  |             } 
  |  
  |             template <typename T> 
  |             inline T process_impl(const operator_type operation, const T arg0, const T arg1, int_type_tag) 
  |             { 
  |                switch (operation) 
  |                { 
  |                   case e_add    : return (arg0 + arg1); 
  |                   case e_sub    : return (arg0 - arg1); 
  |                   case e_mul    : return (arg0 * arg1); 
  |                   case e_div    : return (arg0 / arg1); 
  |                   case e_mod    : return arg0 % arg1; 
  |                   case e_pow    : return pow<T>(arg0,arg1); 
  |                   case e_min    : return std::min<T>(arg0,arg1); 
  |                   case e_max    : return std::max<T>(arg0,arg1); 
  |                   case e_logn   : return logn<T>(arg0,arg1); 
  |                   case e_lt     : return (arg0 <  arg1) ? T(1) : T(0); 
  |                   case e_lte    : return (arg0 <= arg1) ? T(1) : T(0); 
  |                   case e_eq     : return (arg0 == arg1) ? T(1) : T(0); 
  |                   case e_ne     : return (arg0 != arg1) ? T(1) : T(0); 
  |                   case e_gte    : return (arg0 >= arg1) ? T(1) : T(0); 
  |                   case e_gt     : return (arg0 >  arg1) ? T(1) : T(0); 
  |                   case e_and    : return ((arg0 != T(0)) && (arg1 != T(0))) ? T(1) : T(0); 
  |                   case e_nand   : return ((arg0 != T(0)) && (arg1 != T(0))) ? T(0) : T(1); 
  |                   case e_or     : return ((arg0 != T(0)) || (arg1 != T(0))) ? T(1) : T(0); 
  |                   case e_nor    : return ((arg0 != T(0)) || (arg1 != T(0))) ? T(0) : T(1); 
  |                   case e_xor    : return arg0 ^ arg1; 
  |                   case e_xnor   : return !(arg0 ^ arg1); 
  |                   case e_root   : return root<T>(arg0,arg1); 
  |                   case e_equal  : return arg0 == arg1; 
  |                   case e_nequal : return arg0 != arg1; 
  |                   case e_hypot  : return hypot<T>(arg0,arg1); 
  |                   case e_shr    : return arg0 >> arg1; 
  |                   case e_shl    : return arg0 << arg1; 
  |  
  |                   default       : exprtk_debug(("numeric::details::process_impl<IntType> - Invalid binary operation.\n")); 
  |                                   return std::numeric_limits<T>::quiet_NaN(); 
  |                } 
  |             } 
  |          } 
  |  
  |          template <typename T> 
  |          inline T process(const operator_type operation, const T arg) 
  |          { 
  |             return exprtk::details::numeric::details::process_impl(operation,arg); 
  |          } 
  |  
  |          template <typename T> 
  |          inline T process(const operator_type operation, const T arg0, const T arg1) 
  |          { 
  |             return exprtk::details::numeric::details::process_impl(operation, arg0, arg1); 
  |          } 
  |       } 
  |  
  |       template <typename Node> 
  |       struct node_collector_interface 
  |       { 
  |          typedef Node* node_ptr_t; 
  |          typedef Node** node_pp_t; 
  |          typedef std::vector<node_pp_t> noderef_list_t; 
  |  
  |          virtual ~node_collector_interface() 
  |          {} 
  |  
  |          virtual void collect_nodes(noderef_list_t&) 
  |          {} 
  |       }; 
  |  
  |       template <typename Node> 
  |       struct node_depth_base; 
  |  
  |       template <typename T> 
  |       class expression_node : public node_collector_interface<expression_node<T> > 
  |                             , public node_depth_base<expression_node<T> > 
  |       { 
  |       public: 
  |  
  |          enum node_type 
  |          { 
  |             e_none          , e_null          , e_constant    , e_unary        , 
  |             e_binary        , e_binary_ext    , e_trinary     , e_quaternary   , 
  |             e_vararg        , e_conditional   , e_while       , e_repeat       , 
  |             e_for           , e_switch        , e_mswitch     , e_return       , 
  |             e_retenv        , e_variable      , e_stringvar   , e_stringconst  , 
  |             e_stringvarrng  , e_cstringvarrng , e_strgenrange , e_strconcat    , 
  |             e_stringvarsize , e_strswap       , e_stringsize  , e_stringvararg , 
  |             e_function      , e_vafunction    , e_genfunction , e_strfunction  , 
  |             e_strcondition  , e_strccondition , e_add         , e_sub          , 
  |             e_mul           , e_div           , e_mod         , e_pow          , 
  |             e_lt            , e_lte           , e_gt          , e_gte          , 
  |             e_eq            , e_ne            , e_and         , e_nand         , 
  |             e_or            , e_nor           , e_xor         , e_xnor         , 
  |             e_in            , e_like          , e_ilike       , e_inranges     , 
  |             e_ipow          , e_ipowinv       , e_abs         , e_acos         , 
  |             e_acosh         , e_asin          , e_asinh       , e_atan         , 
  |             e_atanh         , e_ceil          , e_cos         , e_cosh         , 
  |             e_exp           , e_expm1         , e_floor       , e_log          , 
  |             e_log10         , e_log2          , e_log1p       , e_neg          , 
  |             e_pos           , e_round         , e_sin         , e_sinc         , 
  |             e_sinh          , e_sqrt          , e_tan         , e_tanh         , 
  |             e_cot           , e_sec           , e_csc         , e_r2d          , 
  |             e_d2r           , e_d2g           , e_g2d         , e_notl         , 
  |             e_sgn           , e_erf           , e_erfc        , e_ncdf         , 
  |             e_frac          , e_trunc         , e_uvouv       , e_vov          , 
  |             e_cov           , e_voc           , e_vob         , e_bov          , 
  |             e_cob           , e_boc           , e_vovov       , e_vovoc        , 
  |             e_vocov         , e_covov         , e_covoc       , e_vovovov      , 
  |             e_vovovoc       , e_vovocov       , e_vocovov     , e_covovov      , 
  |             e_covocov       , e_vocovoc       , e_covovoc     , e_vococov      , 
  |             e_sf3ext        , e_sf4ext        , e_nulleq      , e_strass       , 
  |             e_vector        , e_vecsize       , e_vecelem     , e_veccelem     , 
  |             e_vecelemrtc    , e_veccelemrtc   , e_rbvecelem   , e_rbvecelemrtc , 
  |             e_rbveccelem    , e_rbveccelemrtc , e_vecinit     , e_vecvalass    , 
  |             e_vecvecass     , e_vecopvalass   , e_vecopvecass , e_vecfunc      , 
  |             e_vecvecswap    , e_vecvecineq    , e_vecvalineq  , e_valvecineq   , 
  |             e_vecvecarith   , e_vecvalarith   , e_valvecarith , e_vecunaryop   , 
  |             e_vecondition   , e_break         , e_continue    , e_swap         , 
  |             e_assert 
  |          }; 
  |  
  |          typedef T value_type; 
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef node_collector_interface<expression_node<T> > nci_t; 
  |          typedef typename nci_t::noderef_list_t noderef_list_t; 
  |          typedef node_depth_base<expression_node<T> > ndb_t; 
  |  
  |          virtual ~expression_node() 
  |          {} 
  |  
  |          inline virtual T value() const 
  |          { 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          inline virtual expression_node<T>* branch(const std::size_t& index = 0) const 
  |          { 
  |             return reinterpret_cast<expression_ptr>(index * 0); 
  |          } 
  |  
  |          inline virtual node_type type() const 
  |          { 
  |             return e_none; 
  |          } 
  |  
  |          inline virtual bool valid() const 
  |          { 
  |             return true; 
  |          } 
  |       }; // class expression_node 
  |  
  |       template <typename T> 
  |       inline bool is_generally_string_node(const expression_node<T>* node); 
  |  
  |       inline bool is_true(const double v) 
  |       { 
  |          return std::not_equal_to<double>()(0.0,v); 
  |       } 
  |  
  |       inline bool is_true(const long double v) 
  |       { 
  |          return std::not_equal_to<long double>()(0.0L,v); 
  |       } 
  |  
  |       inline bool is_true(const float v) 
  |       { 
  |          return std::not_equal_to<float>()(0.0f,v); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_true(const expression_node<T>* node) 
  |       { 
  |          return std::not_equal_to<T>()(T(0),node->value()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_true(const std::pair<expression_node<T>*,bool>& node) 
  |       { 
  |          return std::not_equal_to<T>()(T(0),node.first->value()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_false(const expression_node<T>* node) 
  |       { 
  |          return std::equal_to<T>()(T(0),node->value()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_false(const std::pair<expression_node<T>*,bool>& node) 
  |       { 
  |          return std::equal_to<T>()(T(0),node.first->value()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_literal_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_constant == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_unary_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_unary == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_neg_unary_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_neg == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_binary_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_binary == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_variable_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_variable == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_ivariable_node(const expression_node<T>* node) 
  |       { 
  |          return node && 
  |                 ( 
  |                   details::expression_node<T>::e_variable      == node->type() || 
  |                   details::expression_node<T>::e_vecelem       == node->type() || 
  |                   details::expression_node<T>::e_veccelem      == node->type() || 
  |                   details::expression_node<T>::e_vecelemrtc    == node->type() || 
  |                   details::expression_node<T>::e_veccelemrtc   == node->type() || 
  |                   details::expression_node<T>::e_rbvecelem     == node->type() || 
  |                   details::expression_node<T>::e_rbveccelem    == node->type() || 
  |                   details::expression_node<T>::e_rbvecelemrtc  == node->type() || 
  |                   details::expression_node<T>::e_rbveccelemrtc == node->type() 
  |                 ); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_vector_elem_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_vecelem == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_vector_celem_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_veccelem == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_vector_elem_rtc_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_vecelemrtc == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_vector_celem_rtc_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_veccelemrtc == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_rebasevector_elem_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_rbvecelem == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_rebasevector_elem_rtc_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_rbvecelemrtc == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_rebasevector_celem_rtc_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_rbveccelemrtc == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_rebasevector_celem_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_rbveccelem == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_vector_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_vector == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_ivector_node(const expression_node<T>* node) 
  |       { 
  |          if (node) 
  |          { 
  |             switch (node->type()) 
  |             { 
  |                case details::expression_node<T>::e_vector      : 
  |                case details::expression_node<T>::e_vecvalass   : 
  |                case details::expression_node<T>::e_vecvecass   : 
  |                case details::expression_node<T>::e_vecopvalass : 
  |                case details::expression_node<T>::e_vecopvecass : 
  |                case details::expression_node<T>::e_vecvecswap  : 
  |                case details::expression_node<T>::e_vecvecarith : 
  |                case details::expression_node<T>::e_vecvalarith : 
  |                case details::expression_node<T>::e_valvecarith : 
  |                case details::expression_node<T>::e_vecunaryop  : 
  |                case details::expression_node<T>::e_vecondition : return true; 
  |                default                                         : return false; 
  |             } 
  |          } 
  |          else 
  |             return false; 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_constant_node(const expression_node<T>* node) 
  |       { 
  |          return node && 
  |          ( 
  |            details::expression_node<T>::e_constant    == node->type() || 
  |            details::expression_node<T>::e_stringconst == node->type() 
  |          ); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_null_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_null == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_break_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_break == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_continue_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_continue == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_swap_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_swap == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_function(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_function == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_vararg_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_vararg == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_return_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_return == node->type()); 
  |       } 
  |  
  |       template <typename T> class unary_node; 
  |  
  |       template <typename T> 
  |       inline bool is_negate_node(const expression_node<T>* node) 
  |       { 
  |          if (node && is_unary_node(node)) 
  |          { 
  |             return (details::e_neg == static_cast<const unary_node<T>*>(node)->operation()); 
  |          } 
  |          else 
  |             return false; 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_assert_node(const expression_node<T>* node) 
  |       { 
  |          return node && (details::expression_node<T>::e_assert == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool branch_deletable(const expression_node<T>* node) 
  |       { 
  |          return (0 != node)             && 
  |                 !is_variable_node(node) && 
  |                 !is_string_node  (node) ; 
  |       } 
  |  
  |       template <std::size_t N, typename T> 
  |       inline bool all_nodes_valid(expression_node<T>* const (&b)[N]) 
  |       { 
  |          for (std::size_t i = 0; i < N; ++i) 
  |          { 
  |             if (0 == b[i]) return false; 
  |          } 
  |  
  |          return true; 
  |       } 
  |  
  |       template <typename T, 
  |                 typename Allocator, 
  |                 template <typename, typename> class Sequence> 
  |       inline bool all_nodes_valid(const Sequence<expression_node<T>*,Allocator>& b) 
  |       { 
  |          for (std::size_t i = 0; i < b.size(); ++i) 
  |          { 
  |             if (0 == b[i]) return false; 
  |          } 
  |  
  |          return true; 
  |       } 
  |  
  |       template <std::size_t N, typename T> 
  |       inline bool all_nodes_variables(expression_node<T>* const (&b)[N]) 
  |       { 
  |          for (std::size_t i = 0; i < N; ++i) 
  |          { 
  |             if (0 == b[i]) 
  |                return false; 
  |             else if (!is_variable_node(b[i])) 
  |                return false; 
  |          } 
  |  
  |          return true; 
  |       } 
  |  
  |       template <typename T, 
  |                 typename Allocator, 
  |                 template <typename, typename> class Sequence> 
  |       inline bool all_nodes_variables(const Sequence<expression_node<T>*,Allocator>& b) 
  |       { 
  |          for (std::size_t i = 0; i < b.size(); ++i) 
  |          { 
  |             if (0 == b[i]) 
  |                return false; 
  |             else if (!is_variable_node(b[i])) 
  |                return false; 
  |          } 
  |  
  |          return true; 
  |       } 
  |  
  |       template <typename Node> 
  |       class node_collection_destructor 
  |       { 
  |       public: 
  |  
  |          typedef node_collector_interface<Node> nci_t; 
  |  
  |          typedef typename nci_t::node_ptr_t     node_ptr_t; 
  |          typedef typename nci_t::node_pp_t      node_pp_t; 
  |          typedef typename nci_t::noderef_list_t noderef_list_t; 
  |  
  |          static void delete_nodes(node_ptr_t& root) 
  |          { 
  |             std::vector<node_pp_t> node_delete_list; 
  |             node_delete_list.reserve(1000); 
  |  
  |             collect_nodes(root, node_delete_list); 
  |  
  |             for (std::size_t i = 0; i < node_delete_list.size(); ++i) 
  |             { 
  |                node_ptr_t& node = *node_delete_list[i]; 
  |                exprtk_debug(("ncd::delete_nodes() - deleting: %p\n", reinterpret_cast<void*>(node))); 
  |                delete node; 
  |                node = reinterpret_cast<node_ptr_t>(0); 
  |             } 
  |          } 
  |  
  |       private: 
  |  
  |          static void collect_nodes(node_ptr_t& root, noderef_list_t& node_delete_list) 
  |          { 
  |             std::deque<node_ptr_t> node_list; 
  |             node_list.push_back(root); 
  |             node_delete_list.push_back(&root); 
  |  
  |             noderef_list_t child_node_delete_list; 
  |             child_node_delete_list.reserve(1000); 
  |  
  |             while (!node_list.empty()) 
  |             { 
  |                node_list.front()->collect_nodes(child_node_delete_list); 
  |  
  |                if (!child_node_delete_list.empty()) 
  |                { 
  |                   for (std::size_t i = 0; i < child_node_delete_list.size(); ++i) 
  |                   { 
  |                      node_pp_t& node = child_node_delete_list[i]; 
  |  
  |                      if (0 == (*node)) 
  |                      { 
  |                         exprtk_debug(("ncd::collect_nodes() - null node encountered.\n")); 
  |                      } 
  |  
  |                      node_list.push_back(*node); 
  |                   } 
  |  
  |                   node_delete_list.insert( 
  |                      node_delete_list.end(), 
  |                      child_node_delete_list.begin(), child_node_delete_list.end()); 
  |  
  |                   child_node_delete_list.clear(); 
  |                } 
  |  
  |                node_list.pop_front(); 
  |             } 
  |  
  |             std::reverse(node_delete_list.begin(), node_delete_list.end()); 
  |          } 
  |       }; 
  |  
  |       template <typename NodeAllocator, typename T, std::size_t N> 
  |       inline void free_all_nodes(NodeAllocator& node_allocator, expression_node<T>* (&b)[N]) 
  |       { 
  |          for (std::size_t i = 0; i < N; ++i) 
  |          { 
  |             free_node(node_allocator,b[i]); 
  |          } 
  |       } 
  |  
  |       template <typename NodeAllocator, 
  |                 typename T, 
  |                 typename Allocator, 
  |                 template <typename, typename> class Sequence> 
  |       inline void free_all_nodes(NodeAllocator& node_allocator, Sequence<expression_node<T>*,Allocator>& b) 
  |       { 
  |          for (std::size_t i = 0; i < b.size(); ++i) 
  |          { 
  |             free_node(node_allocator,b[i]); 
  |          } 
  |  
  |          b.clear(); 
  |       } 
  |  
  |       template <typename NodeAllocator, typename T> 
  |       inline void free_node(NodeAllocator&, expression_node<T>*& node) 
  |       { 
  |          if ((0 == node) || is_variable_node(node) || is_string_node(node)) 
  |          { 
  |             return; 
  |          } 
  |  
  |          node_collection_destructor<expression_node<T> > 
  |             ::delete_nodes(node); 
  |       } 
  |  
  |       template <typename T> 
  |       inline void destroy_node(expression_node<T>*& node) 
  |       { 
  |          if (0 != node) 
  |          { 
  |             node_collection_destructor<expression_node<T> > 
  |                ::delete_nodes(node); 
  |          } 
  |       } 
  |  
  |       template <typename Node> 
  |       struct node_depth_base 
  |       { 
  |          typedef Node* node_ptr_t; 
  |          typedef std::pair<node_ptr_t,bool> nb_pair_t; 
  |  
  |          node_depth_base() 
  |          : depth_set(false) 
  |          , depth(0) 
  |          {} 
  |  
  |          virtual ~node_depth_base() 
  |          {} 
  |  
  |          virtual std::size_t node_depth() const { return 1; } 
  |  
  |          std::size_t compute_node_depth(const Node* const& node) const 
  |          { 
  |             if (!depth_set) 
  |             { 
  |                depth = 1 + (node ? node->node_depth() : 0); 
  |                depth_set = true; 
  |             } 
  |  
  |             return depth; 
  |          } 
  |  
  |          std::size_t compute_node_depth(const nb_pair_t& branch) const 
  |          { 
  |             if (!depth_set) 
  |             { 
  |                depth = 1 + (branch.first ? branch.first->node_depth() : 0); 
  |                depth_set = true; 
  |             } 
  |  
  |             return depth; 
  |          } 
  |  
  |          template <std::size_t N> 
  |          std::size_t compute_node_depth(const nb_pair_t (&branch)[N]) const 
  |          { 
  |             if (!depth_set) 
  |             { 
  |                depth = 0; 
  |  
  |                for (std::size_t i = 0; i < N; ++i) 
  |                { 
  |                   if (branch[i].first) 
  |                   { 
  |                      depth = std::max(depth,branch[i].first->node_depth()); 
  |                   } 
  |                } 
  |  
  |                depth += 1; 
  |                depth_set = true; 
  |             } 
  |  
  |             return depth; 
  |          } 
  |  
  |          template <typename BranchType> 
  |          std::size_t max_node_depth(const BranchType& n0, const BranchType& n1) const 
  |          { 
  |             return std::max(compute_node_depth(n0), compute_node_depth(n1)); 
  |          } 
  |  
  |          template <typename BranchType> 
  |          std::size_t max_node_depth(const BranchType& n0, const BranchType& n1, const BranchType& n2) const 
  |          { 
  |             return std::max(compute_node_depth(n0), 
  |                    std::max(compute_node_depth(n1), compute_node_depth(n2))); 
  |          } 
  |  
  |          template <typename BranchType> 
  |          std::size_t max_node_depth(const BranchType& n0, const BranchType& n1, 
  |                                     const BranchType& n2, const BranchType& n3) const 
  |          { 
  |             return std::max( 
  |                      std::max(compute_node_depth(n0), compute_node_depth(n1)), 
  |                      std::max(compute_node_depth(n2), compute_node_depth(n3))); 
  |          } 
  |  
  |          template <typename BranchType> 
  |          std::size_t compute_node_depth(const BranchType& n0, const BranchType& n1) const 
  |          { 
  |             if (!depth_set) 
  |             { 
  |                depth = 1 + max_node_depth(n0, n1); 
  |                depth_set = true; 
  |             } 
  |  
  |             return depth; 
  |          } 
  |  
  |          template <typename BranchType> 
  |          std::size_t compute_node_depth(const BranchType& n0, const BranchType& n1, 
  |                                         const BranchType& n2) const 
  |          { 
  |             if (!depth_set) 
  |             { 
  |                depth = 1 + max_node_depth(n0, n1, n2); 
  |                depth_set = true; 
  |             } 
  |  
  |             return depth; 
  |          } 
  |  
  |          template <typename BranchType> 
  |          std::size_t compute_node_depth(const BranchType& n0, const BranchType& n1, 
  |                                         const BranchType& n2, const BranchType& n3) const 
  |          { 
  |             if (!depth_set) 
  |             { 
  |                depth = 1 + max_node_depth(n0, n1, n2, n3); 
  |                depth_set = true; 
  |             } 
  |  
  |             return depth; 
  |          } 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          std::size_t compute_node_depth(const Sequence<node_ptr_t, Allocator>& branch_list) const 
  |          { 
  |             if (!depth_set) 
  |             { 
  |                for (std::size_t i = 0; i < branch_list.size(); ++i) 
  |                { 
  |                   if (branch_list[i]) 
  |                   { 
  |                      depth = std::max(depth, compute_node_depth(branch_list[i])); 
  |                   } 
  |                } 
  |  
  |                depth_set = true; 
  |             } 
  |  
  |             return depth; 
  |          } 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          std::size_t compute_node_depth(const Sequence<nb_pair_t,Allocator>& branch_list) const 
  |          { 
  |             if (!depth_set) 
  |             { 
  |                for (std::size_t i = 0; i < branch_list.size(); ++i) 
  |                { 
  |                   if (branch_list[i].first) 
  |                   { 
  |                      depth = std::max(depth, compute_node_depth(branch_list[i].first)); 
  |                   } 
  |                } 
  |  
  |                depth_set = true; 
  |             } 
  |  
  |             return depth; 
  |          } 
  |  
  |          mutable bool depth_set; 
  |          mutable std::size_t depth; 
  |  
  |          template <typename NodeSequence> 
  |          void collect(node_ptr_t const& node, 
  |                       const bool deletable, 
  |                       NodeSequence& delete_node_list) const 
  |          { 
  |             if ((0 != node) && deletable) 
  |             { 
  |                delete_node_list.push_back(const_cast<node_ptr_t*>(&node)); 
  |             } 
  |          } 
  |  
  |          template <typename NodeSequence> 
  |          void collect(const nb_pair_t& branch, 
  |                       NodeSequence& delete_node_list) const 
  |          { 
  |             collect(branch.first, branch.second, delete_node_list); 
  |          } 
  |  
  |          template <typename NodeSequence> 
  |          void collect(Node*& node, 
  |                       NodeSequence& delete_node_list) const 
  |          { 
  |             collect(node, branch_deletable(node), delete_node_list); 
  |          } 
  |  
  |          template <std::size_t N, typename NodeSequence> 
  |          void collect(const nb_pair_t(&branch)[N], 
  |                       NodeSequence& delete_node_list) const 
  |          { 
  |             for (std::size_t i = 0; i < N; ++i) 
  |             { 
  |                collect(branch[i].first, branch[i].second, delete_node_list); 
  |             } 
  |          } 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence, 
  |                    typename NodeSequence> 
  |          void collect(const Sequence<nb_pair_t, Allocator>& branch, 
  |                       NodeSequence& delete_node_list) const 
  |          { 
  |             for (std::size_t i = 0; i < branch.size(); ++i) 
  |             { 
  |                collect(branch[i].first, branch[i].second, delete_node_list); 
  |             } 
  |          } 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence, 
  |                    typename NodeSequence> 
  |          void collect(const Sequence<node_ptr_t, Allocator>& branch_list, 
  |                       NodeSequence& delete_node_list) const 
  |          { 
  |             for (std::size_t i = 0; i < branch_list.size(); ++i) 
  |             { 
  |                collect(branch_list[i], branch_deletable(branch_list[i]), delete_node_list); 
  |             } 
  |          } 
  |  
  |          template <typename Boolean, 
  |                    typename AllocatorT, 
  |                    typename AllocatorB, 
  |                    template <typename, typename> class Sequence, 
  |                    typename NodeSequence> 
  |          void collect(const Sequence<node_ptr_t, AllocatorT>& branch_list, 
  |                       const Sequence<Boolean, AllocatorB>& branch_deletable_list, 
  |                       NodeSequence& delete_node_list) const 
  |          { 
  |             for (std::size_t i = 0; i < branch_list.size(); ++i) 
  |             { 
  |                collect(branch_list[i], branch_deletable_list[i], delete_node_list); 
  |             } 
  |          } 
  |       }; 
  |  
  |       template <typename Type> 
  |       class vector_holder 
  |       { 
  |       private: 
  |  
  |          typedef Type value_type; 
  |          typedef value_type* value_ptr; 
  |          typedef const value_ptr const_value_ptr; 
  |          typedef vector_holder<Type> vector_holder_t; 
  |  
  |          class vector_holder_base 
  |          { 
  |          public: 
  |  
  |             virtual ~vector_holder_base() 
  |             {} 
  |  
  |             inline value_ptr operator[](const std::size_t& index) const 
  |             { 
  |                return value_at(index); 
  |             } 
  |  
  |             inline std::size_t size() const 
  |             { 
  |                return vector_size(); 
  |             } 
  |  
  |             inline std::size_t base_size() const 
  |             { 
  |                return vector_base_size(); 
  |             } 
  |  
  |             inline value_ptr data() const 
  |             { 
  |                return value_at(0); 
  |             } 
  |  
  |             virtual inline bool rebaseable() const 
  |             { 
  |                return false; 
  |             } 
  |  
  |             virtual void set_ref(value_ptr*) 
  |             {} 
  |  
  |             virtual void remove_ref(value_ptr*) 
  |             {} 
  |  
  |             virtual vector_view<Type>* rebaseable_instance() 
  |             { 
  |                return reinterpret_cast<vector_view<Type>*>(0); 
  |             } 
  |  
  |          protected: 
  |  
  |             virtual value_ptr value_at(const std::size_t&) const = 0; 
  |             virtual std::size_t vector_size()              const = 0; 
  |             virtual std::size_t vector_base_size()         const = 0; 
  |          }; 
  |  
  |          class array_vector_impl exprtk_final : public vector_holder_base 
  |          { 
  |          public: 
  |  
  |             array_vector_impl(const Type* vec, const std::size_t& vec_size) 
  |             : vec_(vec) 
  |             , size_(vec_size) 
  |             {} 
  |  
  |          protected: 
  |  
  |             value_ptr value_at(const std::size_t& index) const exprtk_override 
  |             { 
  |                assert(index < size_); 
  |                return const_cast<const_value_ptr>(vec_ + index); 
  |             } 
  |  
  |             std::size_t vector_size() const exprtk_override 
  |             { 
  |                return size_; 
  |             } 
  |  
  |             std::size_t vector_base_size() const exprtk_override 
  |             { 
  |                return vector_size(); 
  |             } 
  |  
  |          private: 
  |  
  |             array_vector_impl(const array_vector_impl&) exprtk_delete; 
  |             array_vector_impl& operator=(const array_vector_impl&) exprtk_delete; 
  |  
  |             const Type* vec_; 
  |             const std::size_t size_; 
  |          }; 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          class sequence_vector_impl exprtk_final : public vector_holder_base 
  |          { 
  |          public: 
  |  
  |             typedef Sequence<Type,Allocator> sequence_t; 
  |  
  |             explicit sequence_vector_impl(sequence_t& seq) 
  |             : sequence_(seq) 
  |             {} 
  |  
  |          protected: 
  |  
  |             value_ptr value_at(const std::size_t& index) const exprtk_override 
  |             { 
  |                assert(index < sequence_.size()); 
  |                return (&sequence_[index]); 
  |             } 
  |  
  |             std::size_t vector_size() const exprtk_override 
  |             { 
  |                return sequence_.size(); 
  |             } 
  |  
  |             std::size_t vector_base_size() const exprtk_override 
  |             { 
  |                return vector_size(); 
  |             } 
  |  
  |          private: 
  |  
  |             sequence_vector_impl(const sequence_vector_impl&) exprtk_delete; 
  |             sequence_vector_impl& operator=(const sequence_vector_impl&) exprtk_delete; 
  |  
  |             sequence_t& sequence_; 
  |          }; 
  |  
  |          class vector_view_impl exprtk_final : public vector_holder_base 
  |          { 
  |          public: 
  |  
  |             typedef exprtk::vector_view<Type> vector_view_t; 
  |  
  |             vector_view_impl(vector_view_t& vec_view) 
  |             : vec_view_(vec_view) 
  |             { 
  |                assert(vec_view_.size() > 0); 
  |             } 
  |  
  |             void set_ref(value_ptr* ref) exprtk_override 
  |             { 
  |                vec_view_.set_ref(ref); 
  |             } 
  |  
  |             void remove_ref(value_ptr* ref) exprtk_override 
  |             { 
  |                vec_view_.remove_ref(ref); 
  |             } 
  |  
  |             bool rebaseable() const exprtk_override 
  |             { 
  |                return true; 
  |             } 
  |  
  |             vector_view<Type>* rebaseable_instance() exprtk_override 
  |             { 
  |                return &vec_view_; 
  |             } 
  |  
  |          protected: 
  |  
  |             value_ptr value_at(const std::size_t& index) const exprtk_override 
  |             { 
  |                assert(index < vec_view_.size()); 
  |                return (&vec_view_[index]); 
  |             } 
  |  
  |             std::size_t vector_size() const exprtk_override 
  |             { 
  |                return vec_view_.size(); 
  |             } 
  |  
  |             std::size_t vector_base_size() const exprtk_override 
  |             { 
  |                return vec_view_.base_size(); 
  |             } 
  |  
  |          private: 
  |  
  |             vector_view_impl(const vector_view_impl&) exprtk_delete; 
  |             vector_view_impl& operator=(const vector_view_impl&) exprtk_delete; 
  |  
  |             vector_view_t& vec_view_; 
  |          }; 
  |  
  |          class resizable_vector_impl exprtk_final : public vector_holder_base 
  |          { 
  |          public: 
  |  
  |             resizable_vector_impl(vector_holder& vec_view_holder, 
  |                                   const Type* vec, 
  |                                   const std::size_t& vec_size) 
  |             : vec_(vec) 
  |             , size_(vec_size) 
  |             , vec_view_holder_(*vec_view_holder.rebaseable_instance()) 
  |             { 
  |                assert(vec_view_holder.rebaseable_instance()); 
  |                assert(size_ <= vector_base_size()); 
  |             } 
  |  
  |             virtual ~resizable_vector_impl() 
  |             {} 
  |  
  |          protected: 
  |  
  |             value_ptr value_at(const std::size_t& index) const exprtk_override 
  |             { 
  |                assert(index < vector_size()); 
  |                return const_cast<const_value_ptr>(vec_ + index); 
  |             } 
  |  
  |             std::size_t vector_size() const exprtk_override 
  |             { 
  |                return vec_view_holder_.size(); 
  |             } 
  |  
  |             std::size_t vector_base_size() const exprtk_override 
  |             { 
  |                return vec_view_holder_.base_size(); 
  |             } 
  |  
  |             bool rebaseable() const exprtk_override 
  |             { 
  |                return true; 
  |             } 
  |  
  |             virtual vector_view<Type>* rebaseable_instance() exprtk_override 
  |             { 
  |                return &vec_view_holder_; 
  |             } 
  |  
  |          private: 
  |  
  |             resizable_vector_impl(const resizable_vector_impl&) exprtk_delete; 
  |             resizable_vector_impl& operator=(const resizable_vector_impl&) exprtk_delete; 
  |  
  |             const Type* vec_; 
  |             const std::size_t size_; 
  |             vector_view<Type>& vec_view_holder_; 
  |          }; 
  |  
  |       public: 
  |  
  |          typedef typename details::vec_data_store<Type> vds_t; 
  |  
  |          vector_holder(Type* vec, const std::size_t& vec_size) 
  |          : vector_holder_base_(new(buffer)array_vector_impl(vec,vec_size)) 
  |          {} 
  |  
  |          explicit vector_holder(const vds_t& vds) 
  |          : vector_holder_base_(new(buffer)array_vector_impl(vds.data(),vds.size())) 
  |          {} 
  |  
  |          template <typename Allocator> 
  |          explicit vector_holder(std::vector<Type,Allocator>& vec) 
  |          : vector_holder_base_(new(buffer)sequence_vector_impl<Allocator,std::vector>(vec)) 
  |          {} 
  |  
  |          explicit vector_holder(exprtk::vector_view<Type>& vec) 
  |          : vector_holder_base_(new(buffer)vector_view_impl(vec)) 
  |          {} 
  |  
  |          explicit vector_holder(vector_holder_t& vec_holder, const vds_t& vds) 
  |          : vector_holder_base_(new(buffer)resizable_vector_impl(vec_holder, vds.data(), vds.size())) 
  |          {} 
  |  
  |          inline value_ptr operator[](const std::size_t& index) const 
  |          { 
  |             return (*vector_holder_base_)[index]; 
  |          } 
  |  
  |          inline std::size_t size() const 
  |          { 
  |             return vector_holder_base_->size(); 
  |          } 
  |  
  |          inline std::size_t base_size() const 
  |          { 
  |             return vector_holder_base_->base_size(); 
  |          } 
  |  
  |          inline value_ptr data() const 
  |          { 
  |             return vector_holder_base_->data(); 
  |          } 
  |  
  |          void set_ref(value_ptr* ref) 
  |          { 
  |             if (rebaseable()) 
  |             { 
  |                vector_holder_base_->set_ref(ref); 
  |             } 
  |          } 
  |  
  |          void remove_ref(value_ptr* ref) 
  |          { 
  |             if (rebaseable()) 
  |             { 
  |                vector_holder_base_->remove_ref(ref); 
  |             } 
  |          } 
  |  
  |          bool rebaseable() const 
  |          { 
  |             return vector_holder_base_->rebaseable(); 
  |          } 
  |  
  |          vector_view<Type>* rebaseable_instance() 
  |          { 
  |             return vector_holder_base_->rebaseable_instance(); 
  |          } 
  |  
  |       private: 
  |  
  |          vector_holder(const vector_holder<Type>&) exprtk_delete; 
  |          vector_holder<Type>& operator=(const vector_holder<Type>&) exprtk_delete; 
  |  
  |          mutable vector_holder_base* vector_holder_base_; 
  |          uchar_t buffer[64]; 
  |       }; 
  |  
  |       template <typename T> 
  |       class null_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_null; 
  |          } 
  |       }; 
  |  
  |       template <typename T, std::size_t N> 
  |       inline void construct_branch_pair(std::pair<expression_node<T>*,bool> (&branch)[N], 
  |                                         expression_node<T>* b, 
  |                                         const std::size_t& index) 
  |       { 
  |          if (b && (index < N)) 
  |          { 
  |             branch[index] = std::make_pair(b,branch_deletable(b)); 
  |          } 
  |       } 
  |  
  |       template <typename T> 
  |       inline void construct_branch_pair(std::pair<expression_node<T>*,bool>& branch, expression_node<T>* b) 
  |       { 
  |          if (b) 
  |          { 
  |             branch = std::make_pair(b,branch_deletable(b)); 
  |          } 
  |       } 
  |  
  |       template <std::size_t N, typename T> 
  |       inline void init_branches(std::pair<expression_node<T>*,bool> (&branch)[N], 
  |                                 expression_node<T>* b0, 
  |                                 expression_node<T>* b1 = reinterpret_cast<expression_node<T>*>(0), 
  |                                 expression_node<T>* b2 = reinterpret_cast<expression_node<T>*>(0), 
  |                                 expression_node<T>* b3 = reinterpret_cast<expression_node<T>*>(0), 
  |                                 expression_node<T>* b4 = reinterpret_cast<expression_node<T>*>(0), 
  |                                 expression_node<T>* b5 = reinterpret_cast<expression_node<T>*>(0), 
  |                                 expression_node<T>* b6 = reinterpret_cast<expression_node<T>*>(0), 
  |                                 expression_node<T>* b7 = reinterpret_cast<expression_node<T>*>(0), 
  |                                 expression_node<T>* b8 = reinterpret_cast<expression_node<T>*>(0), 
  |                                 expression_node<T>* b9 = reinterpret_cast<expression_node<T>*>(0)) 
  |       { 
  |          construct_branch_pair(branch, b0, 0); 
  |          construct_branch_pair(branch, b1, 1); 
  |          construct_branch_pair(branch, b2, 2); 
  |          construct_branch_pair(branch, b3, 3); 
  |          construct_branch_pair(branch, b4, 4); 
  |          construct_branch_pair(branch, b5, 5); 
  |          construct_branch_pair(branch, b6, 6); 
  |          construct_branch_pair(branch, b7, 7); 
  |          construct_branch_pair(branch, b8, 8); 
  |          construct_branch_pair(branch, b9, 9); 
  |       } 
  |  
  |       template <typename T> 
  |       class null_eq_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          explicit null_eq_node(expression_ptr branch, const bool equality = true) 
  |          : equality_(equality) 
  |          { 
  |             construct_branch_pair(branch_, branch); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             const T v = branch_.first->value(); 
  |             const bool result = details::numeric::is_nan(v); 
  |  
  |             if (result) 
  |                return equality_ ? T(1) : T(0); 
  |             else 
  |                return equality_ ? T(0) : T(1); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_nulleq; 
  |          } 
  |  
  |          inline expression_node<T>* branch(const std::size_t&) const exprtk_override 
  |          { 
  |             return branch_.first; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return branch_.first; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(branch_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(branch_); 
  |          } 
  |  
  |       private: 
  |  
  |          bool equality_; 
  |          branch_t branch_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class literal_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          explicit literal_node(const T& v) 
  |          : value_(v) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return value_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_constant; 
  |          } 
  |  
  |          inline expression_node<T>* branch(const std::size_t&) const exprtk_override 
  |          { 
  |             return reinterpret_cast<expression_node<T>*>(0); 
  |          } 
  |  
  |       private: 
  |  
  |          literal_node(const literal_node<T>&) exprtk_delete; 
  |          literal_node<T>& operator=(const literal_node<T>&) exprtk_delete; 
  |  
  |          const T value_; 
  |       }; 
  |  
  |       template <typename T> 
  |       struct range_pack; 
  |  
  |       template <typename T> 
  |       struct range_data_type; 
  |  
  |       template <typename T> 
  |       class range_interface 
  |       { 
  |       public: 
  |  
  |          typedef range_pack<T> range_t; 
  |  
  |          virtual ~range_interface() 
  |          {} 
  |  
  |          virtual range_t& range_ref() = 0; 
  |  
  |          virtual const range_t& range_ref() const = 0; 
  |       }; 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       template <typename T> 
  |       class string_base_node 
  |       { 
  |       public: 
  |  
  |          typedef range_data_type<T> range_data_type_t; 
  |  
  |          virtual ~string_base_node() 
  |          {} 
  |  
  |          virtual std::string str () const = 0; 
  |  
  |          virtual char_cptr   base() const = 0; 
  |  
  |          virtual std::size_t size() const = 0; 
  |       }; 
  |  
  |       template <typename T> 
  |       class string_literal_node exprtk_final 
  |                                 : public expression_node <T> 
  |                                 , public string_base_node<T> 
  |                                 , public range_interface <T> 
  |       { 
  |       public: 
  |  
  |          typedef range_pack<T> range_t; 
  |  
  |          explicit string_literal_node(const std::string& v) 
  |          : value_(v) 
  |          { 
  |             rp_.n0_c = std::make_pair<bool,std::size_t>(true, 0); 
  |             rp_.n1_c = std::make_pair<bool,std::size_t>(true, v.size()); 
  |             rp_.cache.first  = rp_.n0_c.second; 
  |             rp_.cache.second = rp_.n1_c.second; 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_stringconst; 
  |          } 
  |  
  |          inline expression_node<T>* branch(const std::size_t&) const exprtk_override 
  |          { 
  |             return reinterpret_cast<expression_node<T>*>(0); 
  |          } 
  |  
  |          std::string str() const exprtk_override 
  |          { 
  |             return value_; 
  |          } 
  |  
  |          char_cptr base() const exprtk_override 
  |          { 
  |             return value_.data(); 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return value_.size(); 
  |          } 
  |  
  |          range_t& range_ref() exprtk_override 
  |          { 
  |             return rp_; 
  |          } 
  |  
  |          const range_t& range_ref() const exprtk_override 
  |          { 
  |             return rp_; 
  |          } 
  |  
  |       private: 
  |  
  |          string_literal_node(const string_literal_node<T>&) exprtk_delete; 
  |          string_literal_node<T>& operator=(const string_literal_node<T>&) exprtk_delete; 
  |  
  |          const std::string value_; 
  |          range_t rp_; 
  |       }; 
  |       #endif 
  |  
  |       template <typename T> 
  |       class unary_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          unary_node(const operator_type& opr, expression_ptr branch) 
  |          : operation_(opr) 
  |          { 
  |             construct_branch_pair(branch_,branch); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return numeric::process<T> 
  |                      (operation_,branch_.first->value()); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_unary; 
  |          } 
  |  
  |          inline operator_type operation() 
  |          { 
  |             return operation_; 
  |          } 
  |  
  |          inline expression_node<T>* branch(const std::size_t&) const exprtk_override 
  |          { 
  |             return branch_.first; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return branch_.first && branch_.first->valid(); 
  |          } 
  |  
  |          inline void release() 
  |          { 
  |             branch_.second = false; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(branch_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_final 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(branch_); 
  |          } 
  |  
  |       private: 
  |  
  |          operator_type operation_; 
  |          branch_t branch_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class binary_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          binary_node(const operator_type& opr, 
  |                      expression_ptr branch0, 
  |                      expression_ptr branch1) 
  |          : operation_(opr) 
  |          { 
  |             init_branches<2>(branch_, branch0, branch1); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return numeric::process<T> 
  |                    ( 
  |                       operation_, 
  |                       branch_[0].first->value(), 
  |                       branch_[1].first->value() 
  |                    ); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_binary; 
  |          } 
  |  
  |          inline operator_type operation() 
  |          { 
  |             return operation_; 
  |          } 
  |  
  |          inline expression_node<T>* branch(const std::size_t& index = 0) const exprtk_override 
  |          { 
  |             assert(index < 2); 
  |             return branch_[index].first; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                branch_[0].first && branch_[0].first->valid() && 
  |                branch_[1].first && branch_[1].first->valid() ; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(branch_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_final 
  |          { 
  |             return expression_node<T>::ndb_t::template compute_node_depth<2>(branch_); 
  |          } 
  |  
  |       private: 
  |  
  |          operator_type operation_; 
  |          branch_t branch_[2]; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class binary_ext_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          binary_ext_node(expression_ptr branch0, expression_ptr branch1) 
  |          { 
  |             init_branches<2>(branch_, branch0, branch1); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             const T arg0 = branch_[0].first->value(); 
  |             const T arg1 = branch_[1].first->value(); 
  |             return Operation::process(arg0,arg1); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_binary_ext; 
  |          } 
  |  
  |          inline operator_type operation() 
  |          { 
  |             return Operation::operation(); 
  |          } 
  |  
  |          inline expression_node<T>* branch(const std::size_t& index = 0) const exprtk_override 
  |          { 
  |             assert(index < 2); 
  |             return branch_[index].first; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                branch_[0].first && branch_[0].first->valid() && 
  |                branch_[1].first && branch_[1].first->valid() ; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(branch_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::template compute_node_depth<2>(branch_); 
  |          } 
  |  
  |       protected: 
  |  
  |          branch_t branch_[2]; 
  |       }; 
  |  
  |       template <typename T> 
  |       class trinary_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          trinary_node(const operator_type& opr, 
  |                       expression_ptr branch0, 
  |                       expression_ptr branch1, 
  |                       expression_ptr branch2) 
  |          : operation_(opr) 
  |          { 
  |             init_branches<3>(branch_, branch0, branch1, branch2); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             const T arg0 = branch_[0].first->value(); 
  |             const T arg1 = branch_[1].first->value(); 
  |             const T arg2 = branch_[2].first->value(); 
  |  
  |             switch (operation_) 
  |             { 
  |                case e_inrange : return (arg1 < arg0) ? T(0) : ((arg1 > arg2) ? T(0) : T(1)); 
  |  
  |                case e_clamp   : return (arg1 < arg0) ? arg0 : (arg1 > arg2 ? arg2 : arg1); 
  |  
  |                case e_iclamp  : if ((arg1 <= arg0) || (arg1 >= arg2)) 
  |                                    return arg1; 
  |                                 else 
  |                                    return ((T(2) * arg1  <= (arg2 + arg0)) ? arg0 : arg2); 
  |  
  |                default        : exprtk_debug(("trinary_node::value() - Error: Invalid operation\n")); 
  |                                 return std::numeric_limits<T>::quiet_NaN(); 
  |             } 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_trinary; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                branch_[0].first && branch_[0].first->valid() && 
  |                branch_[1].first && branch_[1].first->valid() && 
  |                branch_[2].first && branch_[2].first->valid() ; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(branch_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override exprtk_final 
  |          { 
  |             return expression_node<T>::ndb_t::template compute_node_depth<3>(branch_); 
  |          } 
  |  
  |       protected: 
  |  
  |          operator_type operation_; 
  |          branch_t branch_[3]; 
  |       }; 
  |  
  |       template <typename T> 
  |       class quaternary_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          quaternary_node(const operator_type& opr, 
  |                          expression_ptr branch0, 
  |                          expression_ptr branch1, 
  |                          expression_ptr branch2, 
  |                          expression_ptr branch3) 
  |          : operation_(opr) 
  |          { 
  |             init_branches<4>(branch_, branch0, branch1, branch2, branch3); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_quaternary; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(branch_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override exprtk_final 
  |          { 
  |             return expression_node<T>::ndb_t::template compute_node_depth<4>(branch_); 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                branch_[0].first && branch_[0].first->valid() && 
  |                branch_[1].first && branch_[1].first->valid() && 
  |                branch_[2].first && branch_[2].first->valid() && 
  |                branch_[3].first && branch_[3].first->valid() ; 
  |          } 
  |  
  |       protected: 
  |  
  |          operator_type operation_; 
  |          branch_t branch_[4]; 
  |       }; 
  |  
  |       template <typename T> 
  |       class conditional_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          conditional_node(expression_ptr condition, 
  |                           expression_ptr consequent, 
  |                           expression_ptr alternative) 
  |          { 
  |             construct_branch_pair(condition_  , condition  ); 
  |             construct_branch_pair(consequent_ , consequent ); 
  |             construct_branch_pair(alternative_, alternative); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             if (is_true(condition_)) 
  |                return consequent_.first->value(); 
  |             else 
  |                return alternative_.first->value(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_conditional; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                condition_  .first && condition_  .first->valid() && 
  |                consequent_ .first && consequent_ .first->valid() && 
  |                alternative_.first && alternative_.first->valid() ; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(condition_   , node_delete_list); 
  |             expression_node<T>::ndb_t::collect(consequent_  , node_delete_list); 
  |             expression_node<T>::ndb_t::collect(alternative_ , node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth 
  |                (condition_, consequent_, alternative_); 
  |          } 
  |  
  |       private: 
  |  
  |          branch_t condition_; 
  |          branch_t consequent_; 
  |          branch_t alternative_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class cons_conditional_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          // Consequent only conditional statement node 
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          cons_conditional_node(expression_ptr condition, 
  |                                expression_ptr consequent) 
  |          { 
  |             construct_branch_pair(condition_ , condition ); 
  |             construct_branch_pair(consequent_, consequent); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             if (is_true(condition_)) 
  |                return consequent_.first->value(); 
  |             else 
  |                return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_conditional; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                condition_ .first && condition_ .first->valid() && 
  |                consequent_.first && consequent_.first->valid() ; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(condition_  , node_delete_list); 
  |             expression_node<T>::ndb_t::collect(consequent_ , node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t:: 
  |                compute_node_depth(condition_, consequent_); 
  |          } 
  |  
  |       private: 
  |  
  |          branch_t condition_; 
  |          branch_t consequent_; 
  |       }; 
  |  
  |       #ifndef exprtk_disable_break_continue 
  |       template <typename T> 
  |       class break_exception 
  |       { 
  |       public: 
  |  
  |          explicit break_exception(const T& v) 
  |          : value(v) 
  |          {} 
  |  
  |          T value; 
  |       }; 
  |  
  |       class continue_exception {}; 
  |  
  |       template <typename T> 
  |       class break_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          explicit break_node(expression_ptr ret = expression_ptr(0)) 
  |          { 
  |             construct_branch_pair(return_, ret); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             const T result = return_.first ? 
  |                              return_.first->value() : 
  |                              std::numeric_limits<T>::quiet_NaN(); 
  |  
  |             throw break_exception<T>(result); 
  |  
  |             #if !defined(_MSC_VER) && !defined(__NVCOMPILER) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |             #endif 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_break; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(return_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(return_); 
  |          } 
  |  
  |       private: 
  |  
  |          branch_t return_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class continue_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             throw continue_exception(); 
  |             #if !defined(_MSC_VER) && !defined(__NVCOMPILER) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |             #endif 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_break; 
  |          } 
  |       }; 
  |       #endif 
  |  
  |       struct loop_runtime_checker 
  |       { 
  |          loop_runtime_checker(loop_runtime_check_ptr loop_runtime_check, 
  |                               loop_runtime_check::loop_types lp_typ = loop_runtime_check::e_invalid) 
  |          : iteration_count_(0) 
  |          , loop_runtime_check_(loop_runtime_check) 
  |          , max_loop_iterations_(loop_runtime_check_->max_loop_iterations) 
  |          , loop_type_(lp_typ) 
  |          { 
  |             assert(loop_runtime_check_); 
  |          } 
  |  
  |          inline void reset(const _uint64_t initial_value = 0) const 
  |          { 
  |             iteration_count_ = initial_value; 
  |          } 
  |  
  |          inline bool check() const 
  |          { 
  |             assert(loop_runtime_check_); 
  |  
  |             if ( 
  |                  (++iteration_count_ <= max_loop_iterations_) && 
  |                  loop_runtime_check_->check() 
  |                ) 
  |             { 
  |                return true; 
  |             } 
  |  
  |             loop_runtime_check::violation_context ctxt; 
  |             ctxt.loop      = loop_type_; 
  |             ctxt.violation = loop_runtime_check::e_iteration_count; 
  |  
  |             loop_runtime_check_->handle_runtime_violation(ctxt); 
  |  
  |             return false; 
  |          } 
  |  
  |          bool valid() const 
  |          { 
  |             return 0 != loop_runtime_check_; 
  |          } 
  |  
  |          mutable _uint64_t iteration_count_; 
  |          mutable loop_runtime_check_ptr loop_runtime_check_; 
  |          const details::_uint64_t& max_loop_iterations_; 
  |          loop_runtime_check::loop_types loop_type_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class while_loop_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          while_loop_node(expression_ptr condition, 
  |                          expression_ptr loop_body) 
  |          { 
  |             construct_branch_pair(condition_, condition); 
  |             construct_branch_pair(loop_body_, loop_body); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T result = T(0); 
  |  
  |             while (is_true(condition_)) 
  |             { 
  |                result = loop_body_.first->value(); 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_while; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                condition_.first && condition_.first->valid() && 
  |                loop_body_.first && loop_body_.first->valid() ; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(condition_ , node_delete_list); 
  |             expression_node<T>::ndb_t::collect(loop_body_ , node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(condition_, loop_body_); 
  |          } 
  |  
  |       protected: 
  |  
  |          branch_t condition_; 
  |          branch_t loop_body_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class while_loop_rtc_node exprtk_final 
  |                                 : public while_loop_node<T> 
  |                                 , public loop_runtime_checker 
  |       { 
  |       public: 
  |  
  |          typedef while_loop_node<T>  parent_t; 
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          while_loop_rtc_node(expression_ptr condition, 
  |                              expression_ptr loop_body, 
  |                              loop_runtime_check_ptr loop_rt_chk) 
  |          : parent_t(condition, loop_body) 
  |          , loop_runtime_checker(loop_rt_chk, loop_runtime_check::e_while_loop) 
  |          { 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |  
  |             T result = T(0); 
  |  
  |             loop_runtime_checker::reset(); 
  |  
  |             while (is_true(parent_t::condition_) && loop_runtime_checker::check()) 
  |             { 
  |                result = parent_t::loop_body_.first->value(); 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          using parent_t::valid; 
  |  
  |          bool valid() const exprtk_override exprtk_final 
  |          { 
  |             return parent_t::valid() && 
  |                    loop_runtime_checker::valid(); 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       class repeat_until_loop_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          repeat_until_loop_node(expression_ptr condition, 
  |                                 expression_ptr loop_body) 
  |          { 
  |             construct_branch_pair(condition_, condition); 
  |             construct_branch_pair(loop_body_, loop_body); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T result = T(0); 
  |  
  |             do 
  |             { 
  |                result = loop_body_.first->value(); 
  |             } 
  |             while (is_false(condition_.first)); 
  |  
  |             return result; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_repeat; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                condition_.first && condition_.first->valid() && 
  |                loop_body_.first && loop_body_.first->valid() ; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(condition_ , node_delete_list); 
  |             expression_node<T>::ndb_t::collect(loop_body_ , node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(condition_, loop_body_); 
  |          } 
  |  
  |       protected: 
  |  
  |          branch_t condition_; 
  |          branch_t loop_body_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class repeat_until_loop_rtc_node exprtk_final 
  |                                        : public repeat_until_loop_node<T> 
  |                                        , public loop_runtime_checker 
  |       { 
  |       public: 
  |  
  |          typedef repeat_until_loop_node<T> parent_t; 
  |          typedef expression_node<T>*       expression_ptr; 
  |  
  |          repeat_until_loop_rtc_node(expression_ptr condition, 
  |                                     expression_ptr loop_body, 
  |                                     loop_runtime_check_ptr loop_rt_chk) 
  |          : parent_t(condition, loop_body) 
  |          , loop_runtime_checker(loop_rt_chk, loop_runtime_check::e_repeat_until_loop) 
  |          { 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T result = T(0); 
  |  
  |             loop_runtime_checker::reset(1); 
  |  
  |             do 
  |             { 
  |                result = parent_t::loop_body_.first->value(); 
  |             } 
  |             while (is_false(parent_t::condition_.first) && loop_runtime_checker::check()); 
  |  
  |             return result; 
  |          } 
  |  
  |          using parent_t::valid; 
  |  
  |          inline bool valid() const exprtk_override exprtk_final 
  |          { 
  |             return parent_t::valid() && 
  |                    loop_runtime_checker::valid(); 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       class for_loop_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          for_loop_node(expression_ptr initialiser, 
  |                        expression_ptr condition, 
  |                        expression_ptr incrementor, 
  |                        expression_ptr loop_body) 
  |          { 
  |             construct_branch_pair(initialiser_, initialiser); 
  |             construct_branch_pair(condition_  , condition  ); 
  |             construct_branch_pair(incrementor_, incrementor); 
  |             construct_branch_pair(loop_body_  , loop_body  ); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T result = T(0); 
  |  
  |             if (initialiser_.first) 
  |                initialiser_.first->value(); 
  |  
  |             if (incrementor_.first) 
  |             { 
  |                while (is_true(condition_)) 
  |                { 
  |                   result = loop_body_.first->value(); 
  |                   incrementor_.first->value(); 
  |                } 
  |             } 
  |             else 
  |             { 
  |                while (is_true(condition_)) 
  |                { 
  |                   result = loop_body_.first->value(); 
  |                } 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_for; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return condition_.first && loop_body_.first; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(initialiser_ , node_delete_list); 
  |             expression_node<T>::ndb_t::collect(condition_   , node_delete_list); 
  |             expression_node<T>::ndb_t::collect(incrementor_ , node_delete_list); 
  |             expression_node<T>::ndb_t::collect(loop_body_   , node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth 
  |                (initialiser_, condition_, incrementor_, loop_body_); 
  |          } 
  |  
  |       protected: 
  |  
  |          branch_t initialiser_; 
  |          branch_t condition_  ; 
  |          branch_t incrementor_; 
  |          branch_t loop_body_  ; 
  |       }; 
  |  
  |       template <typename T> 
  |       class for_loop_rtc_node exprtk_final 
  |                               : public for_loop_node<T> 
  |                               , public loop_runtime_checker 
  |       { 
  |       public: 
  |  
  |          typedef for_loop_node<T>    parent_t; 
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          for_loop_rtc_node(expression_ptr initialiser, 
  |                            expression_ptr condition, 
  |                            expression_ptr incrementor, 
  |                            expression_ptr loop_body, 
  |                            loop_runtime_check_ptr loop_rt_chk) 
  |          : parent_t(initialiser, condition, incrementor, loop_body) 
  |          , loop_runtime_checker(loop_rt_chk, loop_runtime_check::e_for_loop) 
  |          { 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T result = T(0); 
  |  
  |             loop_runtime_checker::reset(); 
  |  
  |             if (parent_t::initialiser_.first) 
  |                parent_t::initialiser_.first->value(); 
  |  
  |             if (parent_t::incrementor_.first) 
  |             { 
  |                while (is_true(parent_t::condition_) && loop_runtime_checker::check()) 
  |                { 
  |                   result = parent_t::loop_body_.first->value(); 
  |                   parent_t::incrementor_.first->value(); 
  |                } 
  |             } 
  |             else 
  |             { 
  |                while (is_true(parent_t::condition_) && loop_runtime_checker::check()) 
  |                { 
  |                   result = parent_t::loop_body_.first->value(); 
  |                } 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          using parent_t::valid; 
  |  
  |          inline bool valid() const exprtk_override exprtk_final 
  |          { 
  |             return parent_t::valid() && 
  |                    loop_runtime_checker::valid(); 
  |          } 
  |       }; 
  |  
  |       #ifndef exprtk_disable_break_continue 
  |       template <typename T> 
  |       class while_loop_bc_node : public while_loop_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef while_loop_node<T>  parent_t; 
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          while_loop_bc_node(expression_ptr condition, 
  |                             expression_ptr loop_body) 
  |          : parent_t(condition, loop_body) 
  |          { 
  |             assert(parent_t::valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T result = T(0); 
  |  
  |             while (is_true(parent_t::condition_)) 
  |             { 
  |                try 
  |                { 
  |                   result = parent_t::loop_body_.first->value(); 
  |                } 
  |                catch(const break_exception<T>& e) 
  |                { 
  |                   return e.value; 
  |                } 
  |                catch(const continue_exception&) 
  |                {} 
  |             } 
  |  
  |             return result; 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       class while_loop_bc_rtc_node exprtk_final 
  |                                    : public while_loop_bc_node<T> 
  |                                    , public loop_runtime_checker 
  |       { 
  |       public: 
  |  
  |          typedef while_loop_bc_node<T> parent_t; 
  |          typedef expression_node<T>*   expression_ptr; 
  |  
  |          while_loop_bc_rtc_node(expression_ptr condition, 
  |                                 expression_ptr loop_body, 
  |                                 loop_runtime_check_ptr loop_rt_chk) 
  |          : parent_t(condition, loop_body) 
  |          , loop_runtime_checker(loop_rt_chk, loop_runtime_check::e_while_loop) 
  |          { 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T result = T(0); 
  |  
  |             loop_runtime_checker::reset(); 
  |  
  |             while (is_true(parent_t::condition_) && loop_runtime_checker::check()) 
  |             { 
  |                try 
  |                { 
  |                   result = parent_t::loop_body_.first->value(); 
  |                } 
  |                catch(const break_exception<T>& e) 
  |                { 
  |                   return e.value; 
  |                } 
  |                catch(const continue_exception&) 
  |                {} 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          using parent_t::valid; 
  |  
  |          inline bool valid() const exprtk_override exprtk_final 
  |          { 
  |             return parent_t::valid() && 
  |                    loop_runtime_checker::valid(); 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       class repeat_until_loop_bc_node : public repeat_until_loop_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef repeat_until_loop_node<T> parent_t; 
  |          typedef expression_node<T>*       expression_ptr; 
  |  
  |          repeat_until_loop_bc_node(expression_ptr condition, 
  |                                    expression_ptr loop_body) 
  |          : parent_t(condition, loop_body) 
  |          { 
  |             assert(parent_t::valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T result = T(0); 
  |  
  |             do 
  |             { 
  |                try 
  |                { 
  |                   result = parent_t::loop_body_.first->value(); 
  |                } 
  |                catch(const break_exception<T>& e) 
  |                { 
  |                   return e.value; 
  |                } 
  |                catch(const continue_exception&) 
  |                {} 
  |             } 
  |             while (is_false(parent_t::condition_.first)); 
  |  
  |             return result; 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       class repeat_until_loop_bc_rtc_node exprtk_final 
  |                                           : public repeat_until_loop_bc_node<T> 
  |                                           , public loop_runtime_checker 
  |       { 
  |       public: 
  |  
  |          typedef repeat_until_loop_bc_node<T> parent_t; 
  |          typedef expression_node<T>*          expression_ptr; 
  |  
  |          repeat_until_loop_bc_rtc_node(expression_ptr condition, 
  |                                        expression_ptr loop_body, 
  |                                        loop_runtime_check_ptr loop_rt_chk) 
  |          : parent_t(condition, loop_body) 
  |          , loop_runtime_checker(loop_rt_chk, loop_runtime_check::e_repeat_until_loop) 
  |          { 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T result = T(0); 
  |  
  |             loop_runtime_checker::reset(); 
  |  
  |             do 
  |             { 
  |                try 
  |                { 
  |                   result = parent_t::loop_body_.first->value(); 
  |                } 
  |                catch(const break_exception<T>& e) 
  |                { 
  |                   return e.value; 
  |                } 
  |                catch(const continue_exception&) 
  |                {} 
  |             } 
  |             while (is_false(parent_t::condition_.first) && loop_runtime_checker::check()); 
  |  
  |             return result; 
  |          } 
  |  
  |          using parent_t::valid; 
  |  
  |          inline bool valid() const exprtk_override exprtk_final 
  |          { 
  |             return parent_t::valid() && 
  |                    loop_runtime_checker::valid(); 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       class for_loop_bc_node : public for_loop_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef for_loop_node<T>    parent_t; 
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          for_loop_bc_node(expression_ptr initialiser, 
  |                           expression_ptr condition, 
  |                           expression_ptr incrementor, 
  |                           expression_ptr loop_body) 
  |          : parent_t(initialiser, condition, incrementor, loop_body) 
  |          { 
  |             assert(parent_t::valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T result = T(0); 
  |  
  |             if (parent_t::initialiser_.first) 
  |                parent_t::initialiser_.first->value(); 
  |  
  |             if (parent_t::incrementor_.first) 
  |             { 
  |                while (is_true(parent_t::condition_)) 
  |                { 
  |                   try 
  |                   { 
  |                      result = parent_t::loop_body_.first->value(); 
  |                   } 
  |                   catch(const break_exception<T>& e) 
  |                   { 
  |                      return e.value; 
  |                   } 
  |                   catch(const continue_exception&) 
  |                   {} 
  |  
  |                   parent_t::incrementor_.first->value(); 
  |                } 
  |             } 
  |             else 
  |             { 
  |                while (is_true(parent_t::condition_)) 
  |                { 
  |                   try 
  |                   { 
  |                      result = parent_t::loop_body_.first->value(); 
  |                   } 
  |                   catch(const break_exception<T>& e) 
  |                   { 
  |                      return e.value; 
  |                   } 
  |                   catch(const continue_exception&) 
  |                   {} 
  |                } 
  |             } 
  |  
  |             return result; 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       class for_loop_bc_rtc_node exprtk_final 
  |                                  : public for_loop_bc_node<T> 
  |                                  , public loop_runtime_checker 
  |       { 
  |       public: 
  |  
  |          typedef for_loop_bc_node<T> parent_t; 
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          for_loop_bc_rtc_node(expression_ptr initialiser, 
  |                               expression_ptr condition, 
  |                               expression_ptr incrementor, 
  |                               expression_ptr loop_body, 
  |                               loop_runtime_check_ptr loop_rt_chk) 
  |          : parent_t(initialiser, condition, incrementor, loop_body) 
  |          , loop_runtime_checker(loop_rt_chk, loop_runtime_check::e_for_loop) 
  |          { 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T result = T(0); 
  |  
  |             loop_runtime_checker::reset(); 
  |  
  |             if (parent_t::initialiser_.first) 
  |                parent_t::initialiser_.first->value(); 
  |  
  |             if (parent_t::incrementor_.first) 
  |             { 
  |                while (is_true(parent_t::condition_) && loop_runtime_checker::check()) 
  |                { 
  |                   try 
  |                   { 
  |                      result = parent_t::loop_body_.first->value(); 
  |                   } 
  |                   catch(const break_exception<T>& e) 
  |                   { 
  |                      return e.value; 
  |                   } 
  |                   catch(const continue_exception&) 
  |                   {} 
  |  
  |                   parent_t::incrementor_.first->value(); 
  |                } 
  |             } 
  |             else 
  |             { 
  |                while (is_true(parent_t::condition_) && loop_runtime_checker::check()) 
  |                { 
  |                   try 
  |                   { 
  |                      result = parent_t::loop_body_.first->value(); 
  |                   } 
  |                   catch(const break_exception<T>& e) 
  |                   { 
  |                      return e.value; 
  |                   } 
  |                   catch(const continue_exception&) 
  |                   {} 
  |                } 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          using parent_t::valid; 
  |  
  |          inline bool valid() const exprtk_override exprtk_final 
  |          { 
  |             return parent_t::valid() && 
  |                    loop_runtime_checker::valid(); 
  |          } 
  |       }; 
  |       #endif 
  |  
  |       template <typename T> 
  |       class switch_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          explicit switch_node(const Sequence<expression_ptr,Allocator>& arg_list) 
  |          { 
  |             if (1 != (arg_list.size() & 1)) 
  |                return; 
  |  
  |             arg_list_.resize(arg_list.size()); 
  |  
  |             for (std::size_t i = 0; i < arg_list.size(); ++i) 
  |             { 
  |                if (arg_list[i] && arg_list[i]->valid()) 
  |                { 
  |                   construct_branch_pair(arg_list_[i], arg_list[i]); 
  |                } 
  |                else 
  |                { 
  |                   arg_list_.clear(); 
  |                   return; 
  |                } 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             const std::size_t upper_bound = (arg_list_.size() - 1); 
  |  
  |             for (std::size_t i = 0; i < upper_bound; i += 2) 
  |             { 
  |                expression_ptr condition  = arg_list_[i    ].first; 
  |                expression_ptr consequent = arg_list_[i + 1].first; 
  |  
  |                if (is_true(condition)) 
  |                { 
  |                   return consequent->value(); 
  |                } 
  |             } 
  |  
  |             return arg_list_[upper_bound].first->value(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override exprtk_final 
  |          { 
  |             return expression_node<T>::e_switch; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return !arg_list_.empty(); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(arg_list_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override exprtk_final 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(arg_list_); 
  |          } 
  |  
  |       protected: 
  |  
  |          std::vector<branch_t> arg_list_; 
  |       }; 
  |  
  |       template <typename T, typename Switch_N> 
  |       class switch_n_node exprtk_final : public switch_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          explicit switch_n_node(const Sequence<expression_ptr,Allocator>& arg_list) 
  |          : switch_node<T>(arg_list) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return Switch_N::process(switch_node<T>::arg_list_); 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       class multi_switch_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          explicit multi_switch_node(const Sequence<expression_ptr,Allocator>& arg_list) 
  |          { 
  |             if (0 != (arg_list.size() & 1)) 
  |                return; 
  |  
  |             arg_list_.resize(arg_list.size()); 
  |  
  |             for (std::size_t i = 0; i < arg_list.size(); ++i) 
  |             { 
  |                if (arg_list[i] && arg_list[i]->valid()) 
  |                { 
  |                   construct_branch_pair(arg_list_[i], arg_list[i]); 
  |                } 
  |                else 
  |                { 
  |                   arg_list_.clear(); 
  |                   return; 
  |                } 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             const std::size_t upper_bound = (arg_list_.size() - 1); 
  |  
  |             T result = T(0); 
  |  
  |             for (std::size_t i = 0; i < upper_bound; i += 2) 
  |             { 
  |                expression_ptr condition  = arg_list_[i    ].first; 
  |                expression_ptr consequent = arg_list_[i + 1].first; 
  |  
  |                if (is_true(condition)) 
  |                { 
  |                   result = consequent->value(); 
  |                } 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_mswitch; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return !arg_list_.empty() && (0 == (arg_list_.size() % 2)); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(arg_list_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override exprtk_final 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(arg_list_); 
  |          } 
  |  
  |       private: 
  |  
  |          std::vector<branch_t> arg_list_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class ivariable 
  |       { 
  |       public: 
  |  
  |          virtual ~ivariable() 
  |          {} 
  |  
  |          virtual T& ref() = 0; 
  |          virtual const T& ref() const = 0; 
  |       }; 
  |  
  |       template <typename T> 
  |       class variable_node exprtk_final 
  |                           : public expression_node<T> 
  |                           , public ivariable      <T> 
  |       { 
  |       public: 
  |  
  |          static T null_value; 
  |  
  |          explicit variable_node() 
  |          : value_(&null_value) 
  |          {} 
  |  
  |          explicit variable_node(T& v) 
  |          : value_(&v) 
  |          {} 
  |  
  |          inline bool operator <(const variable_node<T>& v) const 
  |          { 
  |             return this < (&v); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return (*value_); 
  |          } 
  |  
  |          inline T& ref() exprtk_override 
  |          { 
  |             return (*value_); 
  |          } 
  |  
  |          inline const T& ref() const exprtk_override 
  |          { 
  |             return (*value_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_variable; 
  |          } 
  |  
  |       private: 
  |  
  |          T* value_; 
  |       }; 
  |  
  |       template <typename T> 
  |       T variable_node<T>::null_value = T(std::numeric_limits<T>::quiet_NaN()); 
  |  
  |       template <typename T> 
  |       struct range_pack 
  |       { 
  |          typedef expression_node<T>*           expression_node_ptr; 
  |          typedef std::pair<std::size_t,std::size_t> cached_range_t; 
  |  
  |          range_pack() 
  |          : n0_e (std::make_pair(false,expression_node_ptr(0))) 
  |          , n1_e (std::make_pair(false,expression_node_ptr(0))) 
  |          , n0_c (std::make_pair(false,0)) 
  |          , n1_c (std::make_pair(false,0)) 
  |          , cache(std::make_pair(0,0)) 
  |          {} 
  |  
  |          void clear() 
  |          { 
  |             n0_e  = std::make_pair(false,expression_node_ptr(0)); 
  |             n1_e  = std::make_pair(false,expression_node_ptr(0)); 
  |             n0_c  = std::make_pair(false,0); 
  |             n1_c  = std::make_pair(false,0); 
  |             cache = std::make_pair(0,0); 
  |          } 
  |  
  |          void free() 
  |          { 
  |             if (n0_e.first && n0_e.second) 
  |             { 
  |                n0_e.first = false; 
  |  
  |                if ( 
  |                     !is_variable_node(n0_e.second) && 
  |                     !is_string_node  (n0_e.second) 
  |                   ) 
  |                { 
  |                   destroy_node(n0_e.second); 
  |                } 
  |             } 
  |  
  |             if (n1_e.first && n1_e.second) 
  |             { 
  |                n1_e.first = false; 
  |  
  |                if ( 
  |                     !is_variable_node(n1_e.second) && 
  |                     !is_string_node  (n1_e.second) 
  |                   ) 
  |                { 
  |                   destroy_node(n1_e.second); 
  |                } 
  |             } 
  |          } 
  |  
  |          bool const_range() const 
  |          { 
  |            return ( n0_c.first &&  n1_c.first) && 
  |                   (!n0_e.first && !n1_e.first); 
  |          } 
  |  
  |          bool var_range() const 
  |          { 
  |            return ( n0_e.first &&  n1_e.first) && 
  |                   (!n0_c.first && !n1_c.first); 
  |          } 
  |  
  |          bool operator() (std::size_t& r0, std::size_t& r1, 
  |                           const std::size_t& size = std::numeric_limits<std::size_t>::max()) const 
  |          { 
  |             if (n0_c.first) 
  |                r0 = n0_c.second; 
  |             else if (n0_e.first) 
  |             { 
  |                r0 = static_cast<std::size_t>(details::numeric::to_int64(n0_e.second->value())); 
  |             } 
  |             else 
  |                return false; 
  |  
  |             if (n1_c.first) 
  |                r1 = n1_c.second; 
  |             else if (n1_e.first) 
  |             { 
  |                r1 = static_cast<std::size_t>(details::numeric::to_int64(n1_e.second->value())); 
  |             } 
  |             else 
  |                return false; 
  |  
  |             if ( 
  |                  (std::numeric_limits<std::size_t>::max() != size) && 
  |                  (std::numeric_limits<std::size_t>::max() == r1  ) 
  |                ) 
  |             { 
  |                r1 = size; 
  |             } 
  |  
  |             cache.first  = r0; 
  |             cache.second = r1; 
  |  
  |             #ifndef exprtk_enable_range_runtime_checks 
  |             return (r0 <= r1); 
  |             #else 
  |             return range_runtime_check(r0, r1, size); 
  |             #endif 
  |          } 
  |  
  |          inline std::size_t const_size() const 
  |          { 
  |             return (n1_c.second - n0_c.second); 
  |          } 
  |  
  |          inline std::size_t cache_size() const 
  |          { 
  |             return (cache.second - cache.first); 
  |          } 
  |  
  |          std::pair<bool,expression_node_ptr> n0_e; 
  |          std::pair<bool,expression_node_ptr> n1_e; 
  |          std::pair<bool,std::size_t        > n0_c; 
  |          std::pair<bool,std::size_t        > n1_c; 
  |          mutable cached_range_t             cache; 
  |  
  |          #ifdef exprtk_enable_range_runtime_checks 
  |          bool range_runtime_check(const std::size_t r0, 
  |                                   const std::size_t r1, 
  |                                   const std::size_t size) const 
  |          { 
  |             if (r0 > size) 
  |             { 
  |                throw std::runtime_error("range error: (r0 < 0) || (r0 > size)"); 
  |                #if !defined(_MSC_VER) && !defined(__NVCOMPILER) 
  |                return false; 
  |                #endif 
  |             } 
  |  
  |             if (r1 > size) 
  |             { 
  |                throw std::runtime_error("range error: (r1 < 0) || (r1 > size)"); 
  |                #if !defined(_MSC_VER) && !defined(__NVCOMPILER) 
  |                return false; 
  |                #endif 
  |             } 
  |  
  |             return (r0 <= r1); 
  |          } 
  |          #endif 
  |       }; 
  |  
  |       template <typename T> 
  |       class string_base_node; 
  |  
  |       template <typename T> 
  |       struct range_data_type 
  |       { 
  |          typedef range_pack<T> range_t; 
  |          typedef string_base_node<T>* strbase_ptr_t; 
  |  
  |          range_data_type() 
  |          : range(0) 
  |          , data (0) 
  |          , size (0) 
  |          , type_size(0) 
  |          , str_node (0) 
  |          {} 
  |  
  |          range_t*      range; 
  |          void*         data; 
  |          std::size_t   size; 
  |          std::size_t   type_size; 
  |          strbase_ptr_t str_node; 
  |       }; 
  |  
  |       template <typename T> class vector_node; 
  |  
  |       template <typename T> 
  |       class vector_interface 
  |       { 
  |       public: 
  |  
  |          typedef vector_node<T>*   vector_node_ptr; 
  |          typedef vec_data_store<T> vds_t; 
  |  
  |          virtual ~vector_interface() 
  |          {} 
  |  
  |          virtual std::size_t size     () const = 0; 
  |  
  |          virtual std::size_t base_size() const = 0; 
  |  
  |          virtual vector_node_ptr vec  () const = 0; 
  |  
  |          virtual vector_node_ptr vec  ()       = 0; 
  |  
  |          virtual       vds_t& vds     ()       = 0; 
  |  
  |          virtual const vds_t& vds     () const = 0; 
  |  
  |          virtual bool side_effect     () const { return false; } 
  |       }; 
  |  
  |       template <typename T> 
  |       class vector_node exprtk_final 
  |                         : public expression_node <T> 
  |                         , public vector_interface<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef vector_holder<T>    vector_holder_t; 
  |          typedef vector_node<T>*     vector_node_ptr; 
  |          typedef vec_data_store<T>   vds_t; 
  |  
  |          explicit vector_node(vector_holder_t* vh) 
  |          : vector_holder_(vh) 
  |          , vds_((*vector_holder_).size(),(*vector_holder_)[0]) 
  |          { 
  |             vector_holder_->set_ref(&vds_.ref()); 
  |          } 
  |  
  |          vector_node(const vds_t& vds, vector_holder_t* vh) 
  |          : vector_holder_(vh) 
  |          , vds_(vds) 
  |          {} 
  |  
  |         ~vector_node() 
  |          { 
  |             assert(valid()); 
  |             vector_holder_->remove_ref(&vds_.ref()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return vds().data()[0]; 
  |          } 
  |  
  |          vector_node_ptr vec() const exprtk_override 
  |          { 
  |             return const_cast<vector_node_ptr>(this); 
  |          } 
  |  
  |          vector_node_ptr vec() exprtk_override 
  |          { 
  |             return this; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vector; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return vector_holder_; 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return vec_holder().size(); 
  |          } 
  |  
  |          std::size_t base_size() const exprtk_override 
  |          { 
  |             return vec_holder().base_size(); 
  |          } 
  |  
  |          vds_t& vds() exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |          const vds_t& vds() const exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |          inline vector_holder_t& vec_holder() 
  |          { 
  |             return (*vector_holder_); 
  |          } 
  |  
  |          inline vector_holder_t& vec_holder() const 
  |          { 
  |             return (*vector_holder_); 
  |          } 
  |  
  |       private: 
  |  
  |          vector_holder_t* vector_holder_; 
  |          vds_t                      vds_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class vector_size_node exprtk_final 
  |                         : public expression_node <T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef vector_holder<T>    vector_holder_t; 
  |  
  |          explicit vector_size_node(vector_holder_t* vh) 
  |          : vector_holder_(vh) 
  |          {} 
  |  
  |         ~vector_size_node() 
  |          { 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             assert(vector_holder_); 
  |             return static_cast<T>(vector_holder_->size()); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecsize; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return vector_holder_ && vector_holder_->size(); 
  |          } 
  |  
  |          inline vector_holder_t* vec_holder() 
  |          { 
  |             return vector_holder_; 
  |          } 
  |  
  |       private: 
  |  
  |          vector_holder_t* vector_holder_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class vector_elem_node exprtk_final 
  |                              : public expression_node<T> 
  |                              , public ivariable      <T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>*            expression_ptr; 
  |          typedef vector_holder<T>               vector_holder_t; 
  |          typedef vector_holder_t*               vector_holder_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          vector_elem_node(expression_ptr vec_node, 
  |                           expression_ptr index, 
  |                           vector_holder_ptr vec_holder) 
  |          : vector_holder_(vec_holder) 
  |          , vector_base_((*vec_holder)[0]) 
  |          { 
  |             construct_branch_pair(vector_node_, vec_node); 
  |             construct_branch_pair(index_      , index   ); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline T& ref() exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline const T& ref() const exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecelem; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                vector_holder_        && 
  |                index_.first          && 
  |                vector_node_.first    && 
  |                index_.first->valid() && 
  |                vector_node_.first->valid(); 
  |          } 
  |  
  |          inline vector_holder_t& vec_holder() 
  |          { 
  |             return (*vector_holder_); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(vector_node_, node_delete_list); 
  |             expression_node<T>::ndb_t::collect(index_      , node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth 
  |                (vector_node_, index_); 
  |          } 
  |  
  |       private: 
  |  
  |          inline T* access_vector() const 
  |          { 
  |             vector_node_.first->value(); 
  |             return (vector_base_ + details::numeric::to_uint64(index_.first->value())); 
  |          } 
  |  
  |          vector_holder_ptr vector_holder_; 
  |          T* vector_base_; 
  |          branch_t vector_node_; 
  |          branch_t index_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class vector_celem_node exprtk_final 
  |                               : public expression_node<T> 
  |                               , public ivariable      <T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>*            expression_ptr; 
  |          typedef vector_holder<T>               vector_holder_t; 
  |          typedef vector_holder_t*               vector_holder_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          vector_celem_node(expression_ptr vec_node, 
  |                            const std::size_t index, 
  |                            vector_holder_ptr vec_holder) 
  |          : index_(index) 
  |          , vector_holder_(vec_holder) 
  |          , vector_base_((*vec_holder)[0]) 
  |          { 
  |             construct_branch_pair(vector_node_, vec_node); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline T& ref() exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline const T& ref() const exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_veccelem; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                vector_holder_     && 
  |                vector_node_.first && 
  |                vector_node_.first->valid(); 
  |          } 
  |  
  |          inline vector_holder_t& vec_holder() 
  |          { 
  |             return (*vector_holder_); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(vector_node_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(vector_node_); 
  |          } 
  |  
  |       private: 
  |  
  |          inline T* access_vector() const 
  |          { 
  |             vector_node_.first->value(); 
  |             return (vector_base_ + index_); 
  |          } 
  |  
  |          const std::size_t index_; 
  |          vector_holder_ptr vector_holder_; 
  |          T* vector_base_; 
  |          branch_t vector_node_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class vector_elem_rtc_node exprtk_final 
  |                                  : public expression_node<T> 
  |                                  , public ivariable      <T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>*            expression_ptr; 
  |          typedef vector_holder<T>               vector_holder_t; 
  |          typedef vector_holder_t*               vector_holder_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          vector_elem_rtc_node(expression_ptr vec_node, 
  |                               expression_ptr index, 
  |                               vector_holder_ptr vec_holder, 
  |                               vector_access_runtime_check_ptr vec_rt_chk) 
  |          : vector_holder_(vec_holder) 
  |          , vector_base_((*vec_holder)[0]) 
  |          , vec_rt_chk_(vec_rt_chk) 
  |          , max_vector_index_(vector_holder_->size() - 1) 
  |          { 
  |             construct_branch_pair(vector_node_, vec_node); 
  |             construct_branch_pair(index_      , index   ); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline T& ref() exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline const T& ref() const exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecelemrtc; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                vector_holder_        && 
  |                index_.first          && 
  |                vector_node_.first    && 
  |                index_.first->valid() && 
  |                vector_node_.first->valid(); 
  |          } 
  |  
  |          inline vector_holder_t& vec_holder() 
  |          { 
  |             return (*vector_holder_); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(vector_node_, node_delete_list); 
  |             expression_node<T>::ndb_t::collect(index_,       node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth 
  |                (vector_node_, index_); 
  |          } 
  |  
  |       private: 
  |  
  |          inline T* access_vector() const 
  |          { 
  |             const _uint64_t index = details::numeric::to_uint64(index_.first->value()); 
  |             vector_node_.first->value(); 
  |  
  |             if (index <= max_vector_index_) 
  |             { 
  |                return (vector_holder_->data() + index); 
  |             } 
  |  
  |             assert(vec_rt_chk_); 
  |  
  |             vector_access_runtime_check::violation_context context; 
  |             context.base_ptr   = reinterpret_cast<void*>(vector_base_); 
  |             context.end_ptr    = reinterpret_cast<void*>(vector_base_ + vector_holder_->size()); 
  |             context.access_ptr = reinterpret_cast<void*>(vector_base_ + index); 
  |             context.type_size  = sizeof(T); 
  |  
  |             return vec_rt_chk_->handle_runtime_violation(context) ? 
  |                reinterpret_cast<T*>(context.access_ptr) : 
  |                vector_base_ ; 
  |          } 
  |  
  |          vector_holder_ptr vector_holder_; 
  |          T*                vector_base_; 
  |          branch_t          vector_node_; 
  |          branch_t          index_; 
  |          vector_access_runtime_check_ptr vec_rt_chk_; 
  |          const std::size_t max_vector_index_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class vector_celem_rtc_node exprtk_final 
  |                                  : public expression_node<T> 
  |                                  , public ivariable      <T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>*            expression_ptr; 
  |          typedef vector_holder<T>               vector_holder_t; 
  |          typedef vector_holder_t*               vector_holder_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          vector_celem_rtc_node(expression_ptr vec_node, 
  |                                const std::size_t index, 
  |                                vector_holder_ptr vec_holder, 
  |                                vector_access_runtime_check_ptr vec_rt_chk) 
  |          : index_(index) 
  |          , max_vector_index_(vec_holder->size() - 1) 
  |          , vector_holder_(vec_holder) 
  |          , vector_base_((*vec_holder)[0]) 
  |          , vec_rt_chk_(vec_rt_chk) 
  |          { 
  |             construct_branch_pair(vector_node_, vec_node); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline T& ref() exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline const T& ref() const exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_veccelemrtc; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                vector_holder_     && 
  |                vector_node_.first && 
  |                vector_node_.first->valid(); 
  |          } 
  |  
  |          inline vector_holder_t& vec_holder() 
  |          { 
  |             return (*vector_holder_); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(vector_node_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(vector_node_); 
  |          } 
  |  
  |       private: 
  |  
  |          inline T* access_vector() const 
  |          { 
  |             vector_node_.first->value(); 
  |  
  |             if (index_ <= max_vector_index_) 
  |             { 
  |                return (vector_holder_->data() + index_); 
  |             } 
  |  
  |             assert(vec_rt_chk_); 
  |  
  |             vector_access_runtime_check::violation_context context; 
  |             context.base_ptr   = reinterpret_cast<void*>(vector_base_); 
  |             context.end_ptr    = reinterpret_cast<void*>(vector_base_ + vector_holder_->size()); 
  |             context.access_ptr = reinterpret_cast<void*>(vector_base_ + index_); 
  |             context.type_size  = sizeof(T); 
  |  
  |             return vec_rt_chk_->handle_runtime_violation(context) ? 
  |                reinterpret_cast<T*>(context.access_ptr) : 
  |                vector_base_ ; 
  |          } 
  |  
  |          const std::size_t index_; 
  |          const std::size_t max_vector_index_; 
  |          vector_holder_ptr vector_holder_; 
  |          T*                vector_base_; 
  |          branch_t          vector_node_; 
  |          vector_access_runtime_check_ptr vec_rt_chk_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class rebasevector_elem_node exprtk_final 
  |                                    : public expression_node<T> 
  |                                    , public ivariable      <T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>*            expression_ptr; 
  |          typedef vector_holder<T>               vector_holder_t; 
  |          typedef vector_holder_t*               vector_holder_ptr; 
  |          typedef vec_data_store<T>              vds_t; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          rebasevector_elem_node(expression_ptr vec_node, 
  |                                 expression_ptr index, 
  |                                 vector_holder_ptr vec_holder) 
  |          : vector_holder_(vec_holder) 
  |          { 
  |             construct_branch_pair(vector_node_, vec_node); 
  |             construct_branch_pair(index_      , index   ); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline T& ref() exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline const T& ref() const exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_rbvecelem; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                vector_holder_        && 
  |                index_.first          && 
  |                vector_node_.first    && 
  |                index_.first->valid() && 
  |                vector_node_.first->valid(); 
  |          } 
  |  
  |          inline vector_holder_t& vec_holder() 
  |          { 
  |             return (*vector_holder_); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(vector_node_, node_delete_list); 
  |             expression_node<T>::ndb_t::collect(index_,       node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth 
  |                (vector_node_, index_); 
  |          } 
  |  
  |       private: 
  |  
  |          inline T* access_vector() const 
  |          { 
  |             vector_node_.first->value(); 
  |             return (vector_holder_->data() + details::numeric::to_uint64(index_.first->value())); 
  |          } 
  |  
  |          vector_holder_ptr vector_holder_; 
  |          branch_t          vector_node_; 
  |          branch_t          index_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class rebasevector_celem_node exprtk_final 
  |                                     : public expression_node<T> 
  |                                     , public ivariable      <T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef vector_holder<T>    vector_holder_t; 
  |          typedef vector_holder_t*    vector_holder_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          rebasevector_celem_node(expression_ptr vec_node, 
  |                                  const std::size_t index, 
  |                                  vector_holder_ptr vec_holder) 
  |          : index_(index) 
  |          , vector_holder_(vec_holder) 
  |          { 
  |             construct_branch_pair(vector_node_, vec_node); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             vector_node_.first->value(); 
  |             return ref();; 
  |          } 
  |  
  |          inline T& ref() exprtk_override 
  |          { 
  |             return *(vector_holder_->data() + index_); 
  |          } 
  |  
  |          inline const T& ref() const exprtk_override 
  |          { 
  |             return *(vector_holder_->data() + index_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_rbveccelem; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                vector_holder_     && 
  |                vector_node_.first && 
  |                vector_node_.first->valid(); 
  |          } 
  |  
  |          inline vector_holder_t& vec_holder() 
  |          { 
  |             return (*vector_holder_); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(vector_node_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(vector_node_); 
  |          } 
  |  
  |       private: 
  |  
  |          const std::size_t index_; 
  |          vector_holder_ptr vector_holder_; 
  |          branch_t          vector_node_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class rebasevector_elem_rtc_node exprtk_final 
  |                                        : public expression_node<T> 
  |                                        , public ivariable      <T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>*            expression_ptr; 
  |          typedef vector_holder<T>               vector_holder_t; 
  |          typedef vector_holder_t*               vector_holder_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          rebasevector_elem_rtc_node(expression_ptr vec_node, 
  |                                     expression_ptr index, 
  |                                     vector_holder_ptr vec_holder, 
  |                                     vector_access_runtime_check_ptr vec_rt_chk) 
  |          : vector_holder_(vec_holder) 
  |          , vec_rt_chk_(vec_rt_chk) 
  |          { 
  |             construct_branch_pair(vector_node_, vec_node); 
  |             construct_branch_pair(index_      , index   ); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline T& ref() exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline const T& ref() const exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_rbvecelemrtc; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                vector_holder_        && 
  |                index_.first          && 
  |                vector_node_.first    && 
  |                index_.first->valid() && 
  |                vector_node_.first->valid(); 
  |          } 
  |  
  |          inline vector_holder_t& vec_holder() 
  |          { 
  |             return (*vector_holder_); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(vector_node_, node_delete_list); 
  |             expression_node<T>::ndb_t::collect(index_      , node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth 
  |                (vector_node_, index_); 
  |          } 
  |  
  |       private: 
  |  
  |          inline T* access_vector() const 
  |          { 
  |             vector_node_.first->value(); 
  |             const _uint64_t index = details::numeric::to_uint64(index_.first->value()); 
  |  
  |             if (index <= (vector_holder_->size() - 1)) 
  |             { 
  |                return (vector_holder_->data() + index); 
  |             } 
  |  
  |             assert(vec_rt_chk_); 
  |  
  |             vector_access_runtime_check::violation_context context; 
  |             context.base_ptr   = reinterpret_cast<void*>(vector_holder_->data()); 
  |             context.end_ptr    = reinterpret_cast<void*>(vector_holder_->data() + vector_holder_->size()); 
  |             context.access_ptr = reinterpret_cast<void*>(vector_holder_->data() + index); 
  |             context.type_size  = sizeof(T); 
  |  
  |             return vec_rt_chk_->handle_runtime_violation(context) ? 
  |                    reinterpret_cast<T*>(context.access_ptr) : 
  |                    vector_holder_->data() ; 
  |          } 
  |  
  |          vector_holder_ptr vector_holder_; 
  |          branch_t          vector_node_; 
  |          branch_t          index_; 
  |          vector_access_runtime_check_ptr vec_rt_chk_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class rebasevector_celem_rtc_node exprtk_final 
  |                                     : public expression_node<T> 
  |                                     , public ivariable      <T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>*            expression_ptr; 
  |          typedef vector_holder<T>               vector_holder_t; 
  |          typedef vector_holder_t*               vector_holder_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          rebasevector_celem_rtc_node(expression_ptr vec_node, 
  |                                      const std::size_t index, 
  |                                      vector_holder_ptr vec_holder, 
  |                                      vector_access_runtime_check_ptr vec_rt_chk) 
  |          : index_(index) 
  |          , vector_holder_(vec_holder) 
  |          , vector_base_((*vec_holder)[0]) 
  |          , vec_rt_chk_(vec_rt_chk) 
  |          { 
  |             construct_branch_pair(vector_node_, vec_node); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline T& ref() exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline const T& ref() const exprtk_override 
  |          { 
  |             return *access_vector(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_rbveccelemrtc; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                vector_holder_     && 
  |                vector_node_.first && 
  |                vector_node_.first->valid(); 
  |          } 
  |  
  |          inline vector_holder_t& vec_holder() 
  |          { 
  |             return (*vector_holder_); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(vector_node_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(vector_node_); 
  |          } 
  |  
  |       private: 
  |  
  |          inline T* access_vector() const 
  |          { 
  |             vector_node_.first->value(); 
  |  
  |             if (index_ <= vector_holder_->size() - 1) 
  |             { 
  |                return (vector_holder_->data() + index_); 
  |             } 
  |  
  |             assert(vec_rt_chk_); 
  |  
  |             vector_access_runtime_check::violation_context context; 
  |             context.base_ptr   = reinterpret_cast<void*>(vector_base_); 
  |             context.end_ptr    = reinterpret_cast<void*>(vector_base_ + vector_holder_->size()); 
  |             context.access_ptr = reinterpret_cast<void*>(vector_base_ + index_); 
  |             context.type_size  = sizeof(T); 
  |  
  |             return vec_rt_chk_->handle_runtime_violation(context) ? 
  |                reinterpret_cast<T*>(context.access_ptr) : 
  |                vector_base_ ; 
  |          } 
  |  
  |          const std::size_t index_; 
  |          vector_holder_ptr vector_holder_; 
  |          T*                vector_base_; 
  |          branch_t          vector_node_; 
  |          vector_access_runtime_check_ptr vec_rt_chk_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class vector_initialisation_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          vector_initialisation_node(T* vector_base, 
  |                                     const std::size_t& size, 
  |                                     const std::vector<expression_ptr>& initialiser_list, 
  |                                     const bool single_value_initialse) 
  |          : vector_base_(vector_base) 
  |          , initialiser_list_(initialiser_list) 
  |          , size_(size) 
  |          , single_value_initialse_(single_value_initialse) 
  |          , zero_value_initialse_(false) 
  |          , const_nonzero_literal_value_initialse_(false) 
  |          , single_initialiser_value_(T(0)) 
  |          { 
  |             if (single_value_initialse_) 
  |             { 
  |                if (initialiser_list_.empty()) 
  |                   zero_value_initialse_ = true; 
  |                else if ( 
  |                          (initialiser_list_.size() == 1) && 
  |                          details::is_constant_node(initialiser_list_[0]) && 
  |                          (T(0) == initialiser_list_[0]->value()) 
  |                        ) 
  |                { 
  |                   zero_value_initialse_ = true; 
  |                } 
  |                else 
  |                { 
  |                   assert(initialiser_list_.size() == 1); 
  |  
  |                   if (details::is_constant_node(initialiser_list_[0])) 
  |                   { 
  |                      const_nonzero_literal_value_initialse_ = true; 
  |                      single_initialiser_value_ = initialiser_list_[0]->value(); 
  |                      assert(T(0) != single_initialiser_value_); 
  |                   } 
  |                } 
  |             } 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             if (single_value_initialse_) 
  |             { 
  |                if (zero_value_initialse_) 
  |                { 
  |                   details::set_zero_value(vector_base_, size_); 
  |                } 
  |                else if (const_nonzero_literal_value_initialse_) 
  |                { 
  |                   for (std::size_t i = 0; i < size_; ++i) 
  |                   { 
  |                      *(vector_base_ + i) = single_initialiser_value_; 
  |                   } 
  |                } 
  |                else 
  |                { 
  |                   for (std::size_t i = 0; i < size_; ++i) 
  |                   { 
  |                      *(vector_base_ + i) = initialiser_list_[0]->value(); 
  |                   } 
  |                } 
  |             } 
  |             else 
  |             { 
  |                const std::size_t initialiser_list_size = initialiser_list_.size(); 
  |  
  |                for (std::size_t i = 0; i < initialiser_list_size; ++i) 
  |                { 
  |                   *(vector_base_ + i) = initialiser_list_[i]->value(); 
  |                } 
  |  
  |                if (initialiser_list_size < size_) 
  |                { 
  |                   details::set_zero_value( 
  |                      vector_base_ + initialiser_list_size, 
  |                      (size_ - initialiser_list_size)); 
  |                } 
  |             } 
  |  
  |             return *(vector_base_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecinit; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return vector_base_; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(initialiser_list_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(initialiser_list_); 
  |          } 
  |  
  |       private: 
  |  
  |          vector_initialisation_node(const vector_initialisation_node<T>&) exprtk_delete; 
  |          vector_initialisation_node<T>& operator=(const vector_initialisation_node<T>&) exprtk_delete; 
  |  
  |          mutable T* vector_base_; 
  |          std::vector<expression_ptr> initialiser_list_; 
  |          const std::size_t size_; 
  |          const bool single_value_initialse_; 
  |          bool zero_value_initialse_; 
  |          bool const_nonzero_literal_value_initialse_; 
  |          T single_initialiser_value_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class vector_init_zero_value_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          vector_init_zero_value_node(T* vector_base, 
  |                                      const std::size_t& size, 
  |                                      const std::vector<expression_ptr>& initialiser_list) 
  |          : vector_base_(vector_base) 
  |          , size_(size) 
  |          , initialiser_list_(initialiser_list) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             details::set_zero_value(vector_base_, size_); 
  |             return *(vector_base_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecinit; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return vector_base_; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(initialiser_list_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(initialiser_list_); 
  |          } 
  |  
  |       private: 
  |  
  |          vector_init_zero_value_node(const vector_init_zero_value_node<T>&) exprtk_delete; 
  |          vector_init_zero_value_node<T>& operator=(const vector_init_zero_value_node<T>&) exprtk_delete; 
  |  
  |          mutable T* vector_base_; 
  |          const std::size_t size_; 
  |          std::vector<expression_ptr> initialiser_list_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class vector_init_single_constvalue_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          vector_init_single_constvalue_node(T* vector_base, 
  |                                             const std::size_t& size, 
  |                                             const std::vector<expression_ptr>& initialiser_list) 
  |          : vector_base_(vector_base) 
  |          , size_(size) 
  |          , initialiser_list_(initialiser_list) 
  |          { 
  |             single_initialiser_value_ = initialiser_list_[0]->value(); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             for (std::size_t i = 0; i < size_; ++i) 
  |             { 
  |                *(vector_base_ + i) = single_initialiser_value_; 
  |             } 
  |  
  |             return *(vector_base_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecinit; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return vector_base_ && 
  |                    (initialiser_list_.size() == 1) && 
  |                    (details::is_constant_node(initialiser_list_[0])) && 
  |                    (single_initialiser_value_ != T(0)); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(initialiser_list_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(initialiser_list_); 
  |          } 
  |  
  |       private: 
  |  
  |          vector_init_single_constvalue_node(const vector_init_single_constvalue_node<T>&) exprtk_delete; 
  |          vector_init_single_constvalue_node<T>& operator=(const vector_init_single_constvalue_node<T>&) exprtk_delete; 
  |  
  |          mutable T* vector_base_; 
  |          const std::size_t size_; 
  |          std::vector<expression_ptr> initialiser_list_; 
  |          T single_initialiser_value_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class vector_init_single_value_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          vector_init_single_value_node(T* vector_base, 
  |                                        const std::size_t& size, 
  |                                        const std::vector<expression_ptr>& initialiser_list) 
  |          : vector_base_(vector_base) 
  |          , size_(size) 
  |          , initialiser_list_(initialiser_list) 
  |          { 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             expression_node<T>& node = *initialiser_list_[0]; 
  |  
  |             for (std::size_t i = 0; i < size_; ++i) 
  |             { 
  |                *(vector_base_ + i) = node.value(); 
  |             } 
  |  
  |             return *(vector_base_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecinit; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return vector_base_ && 
  |                    (initialiser_list_.size() == 1) && 
  |                    !details::is_constant_node(initialiser_list_[0]); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(initialiser_list_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(initialiser_list_); 
  |          } 
  |  
  |       private: 
  |  
  |          vector_init_single_value_node(const vector_init_single_value_node<T>&) exprtk_delete; 
  |          vector_init_single_value_node<T>& operator=(const vector_init_single_value_node<T>&) exprtk_delete; 
  |  
  |          mutable T* vector_base_; 
  |          const std::size_t size_; 
  |          std::vector<expression_ptr> initialiser_list_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class vector_init_iota_constconst_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          vector_init_iota_constconst_node(T* vector_base, 
  |                                           const std::size_t& size, 
  |                                           const std::vector<expression_ptr>& initialiser_list) 
  |          : vector_base_(vector_base) 
  |          , size_(size) 
  |          , initialiser_list_(initialiser_list) 
  |          { 
  |             base_value_      = initialiser_list_[0]->value(); 
  |             increment_value_ = initialiser_list_[1]->value(); 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T value = base_value_; 
  |  
  |             for (std::size_t i = 0; i < size_; ++i, value += increment_value_) 
  |             { 
  |                *(vector_base_ + i) = value; 
  |             } 
  |  
  |             return *(vector_base_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecinit; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return vector_base_ && 
  |                    (initialiser_list_.size() == 2) && 
  |                    (details::is_constant_node(initialiser_list_[0])) && 
  |                    (details::is_constant_node(initialiser_list_[1])) ; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(initialiser_list_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(initialiser_list_); 
  |          } 
  |  
  |       private: 
  |  
  |          vector_init_iota_constconst_node(const vector_init_iota_constconst_node<T>&) exprtk_delete; 
  |          vector_init_iota_constconst_node<T>& operator=(const vector_init_iota_constconst_node<T>&) exprtk_delete; 
  |  
  |          mutable T* vector_base_; 
  |          const std::size_t size_; 
  |          std::vector<expression_ptr> initialiser_list_; 
  |          T base_value_; 
  |          T increment_value_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class vector_init_iota_constnconst_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          vector_init_iota_constnconst_node(T* vector_base, 
  |                                            const std::size_t& size, 
  |                                            const std::vector<expression_ptr>& initialiser_list) 
  |          : vector_base_(vector_base) 
  |          , size_(size) 
  |          , initialiser_list_(initialiser_list) 
  |          { 
  |             assert(valid()); 
  |             base_value_ = initialiser_list_[0]->value(); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T value = base_value_; 
  |             expression_node<T>& increment = *initialiser_list_[1]; 
  |  
  |             for (std::size_t i = 0; i < size_; ++i, value += increment.value()) 
  |             { 
  |                *(vector_base_ + i) = value; 
  |             } 
  |  
  |             return *(vector_base_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecinit; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return vector_base_ && 
  |                   (initialiser_list_.size() == 2) && 
  |                   ( details::is_constant_node(initialiser_list_[0])) && 
  |                   (!details::is_constant_node(initialiser_list_[1])); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(initialiser_list_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(initialiser_list_); 
  |          } 
  |  
  |       private: 
  |  
  |          vector_init_iota_constnconst_node(const vector_init_iota_constnconst_node<T>&) exprtk_delete; 
  |          vector_init_iota_constnconst_node<T>& operator=(const vector_init_iota_constnconst_node<T>&) exprtk_delete; 
  |  
  |          mutable T* vector_base_; 
  |          const std::size_t size_; 
  |          std::vector<expression_ptr> initialiser_list_; 
  |          T base_value_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class vector_init_iota_nconstconst_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          vector_init_iota_nconstconst_node(T* vector_base, 
  |                                            const std::size_t& size, 
  |                                            const std::vector<expression_ptr>& initialiser_list) 
  |          : vector_base_(vector_base) 
  |          , size_(size) 
  |          , initialiser_list_(initialiser_list) 
  |          { 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T value = initialiser_list_[0]->value(); 
  |             const T increment = initialiser_list_[1]->value(); 
  |  
  |             for (std::size_t i = 0; i < size_; ++i, value += increment) 
  |             { 
  |                *(vector_base_ + i) = value; 
  |             } 
  |  
  |             return *(vector_base_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecinit; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return vector_base_ && 
  |                    (initialiser_list_.size() == 2) && 
  |                    (!details::is_constant_node(initialiser_list_[0])) && 
  |                    (details::is_constant_node(initialiser_list_[1])); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(initialiser_list_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(initialiser_list_); 
  |          } 
  |  
  |       private: 
  |  
  |          vector_init_iota_nconstconst_node(const vector_init_iota_nconstconst_node<T>&) exprtk_delete; 
  |          vector_init_iota_nconstconst_node<T>& operator=(const vector_init_iota_nconstconst_node<T>&) exprtk_delete; 
  |  
  |          mutable T* vector_base_; 
  |          const std::size_t size_; 
  |          std::vector<expression_ptr> initialiser_list_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class vector_init_iota_nconstnconst_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          vector_init_iota_nconstnconst_node(T* vector_base, 
  |                                             const std::size_t& size, 
  |                                             const std::vector<expression_ptr>& initialiser_list) 
  |          : vector_base_(vector_base) 
  |          , size_(size) 
  |          , initialiser_list_(initialiser_list) 
  |          { 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T value = initialiser_list_[0]->value(); 
  |             expression_node<T>& increment = *initialiser_list_[1]; 
  |  
  |             for (std::size_t i = 0; i < size_; ++i, value += increment.value()) 
  |             { 
  |                *(vector_base_ + i) = value; 
  |             } 
  |  
  |             return *(vector_base_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecinit; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return vector_base_ && 
  |                    (initialiser_list_.size() == 2) && 
  |                    (!details::is_constant_node(initialiser_list_[0])) && 
  |                    (!details::is_constant_node(initialiser_list_[1])); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(initialiser_list_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(initialiser_list_); 
  |          } 
  |  
  |       private: 
  |  
  |          vector_init_iota_nconstnconst_node(const vector_init_iota_nconstnconst_node<T>&) exprtk_delete; 
  |          vector_init_iota_nconstnconst_node<T>& operator=(const vector_init_iota_nconstnconst_node<T>&) exprtk_delete; 
  |  
  |          mutable T* vector_base_; 
  |          const std::size_t size_; 
  |          std::vector<expression_ptr> initialiser_list_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class swap_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef variable_node<T>*   variable_node_ptr; 
  |  
  |          swap_node(variable_node_ptr var0, variable_node_ptr var1) 
  |          : var0_(var0) 
  |          , var1_(var1) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             std::swap(var0_->ref(),var1_->ref()); 
  |             return var1_->ref(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_swap; 
  |          } 
  |  
  |       private: 
  |  
  |          variable_node_ptr var0_; 
  |          variable_node_ptr var1_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class swap_generic_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef ivariable<T>*       ivariable_ptr; 
  |  
  |          swap_generic_node(expression_ptr var0, expression_ptr var1) 
  |          : binary_node<T>(details::e_swap, var0, var1) 
  |          , var0_(dynamic_cast<ivariable_ptr>(var0)) 
  |          , var1_(dynamic_cast<ivariable_ptr>(var1)) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             std::swap(var0_->ref(),var1_->ref()); 
  |             return var1_->ref(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_swap; 
  |          } 
  |  
  |       private: 
  |  
  |          ivariable_ptr var0_; 
  |          ivariable_ptr var1_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class swap_vecvec_node exprtk_final 
  |                              : public binary_node     <T> 
  |                              , public vector_interface<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef vector_node    <T>* vector_node_ptr; 
  |          typedef vec_data_store <T>  vds_t; 
  |  
  |          using binary_node<T>::branch; 
  |  
  |          swap_vecvec_node(expression_ptr branch0, 
  |                           expression_ptr branch1) 
  |          : binary_node<T>(details::e_swap, branch0, branch1) 
  |          , vec0_node_ptr_(0) 
  |          , vec1_node_ptr_(0) 
  |          , initialised_  (false) 
  |          { 
  |             if (is_ivector_node(branch(0))) 
  |             { 
  |                vector_interface<T>* vi = reinterpret_cast<vector_interface<T>*>(0); 
  |  
  |                if (0 != (vi = dynamic_cast<vector_interface<T>*>(branch(0)))) 
  |                { 
  |                   vec0_node_ptr_ = vi->vec(); 
  |                   vds()          = vi->vds(); 
  |                } 
  |             } 
  |  
  |             if (is_ivector_node(branch(1))) 
  |             { 
  |                vector_interface<T>* vi = reinterpret_cast<vector_interface<T>*>(0); 
  |  
  |                if (0 != (vi = dynamic_cast<vector_interface<T>*>(branch(1)))) 
  |                { 
  |                   vec1_node_ptr_ = vi->vec(); 
  |                } 
  |             } 
  |  
  |             if (vec0_node_ptr_ && vec1_node_ptr_) 
  |             { 
  |                initialised_ = size() <= base_size(); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             binary_node<T>::branch(0)->value(); 
  |             binary_node<T>::branch(1)->value(); 
  |  
  |             T* vec0 = vec0_node_ptr_->vds().data(); 
  |             T* vec1 = vec1_node_ptr_->vds().data(); 
  |  
  |             assert(size() <= base_size()); 
  |             const std::size_t n = size(); 
  |  
  |             for (std::size_t i = 0; i < n; ++i) 
  |             { 
  |                std::swap(vec0[i],vec1[i]); 
  |             } 
  |  
  |             return vec1_node_ptr_->value(); 
  |          } 
  |  
  |          vector_node_ptr vec() const exprtk_override 
  |          { 
  |             return vec0_node_ptr_; 
  |          } 
  |  
  |          vector_node_ptr vec() exprtk_override 
  |          { 
  |             return vec0_node_ptr_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecvecswap; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return initialised_ && binary_node<T>::valid(); 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return std::min( 
  |                vec0_node_ptr_->vec_holder().size(), 
  |                vec1_node_ptr_->vec_holder().size()); 
  |          } 
  |  
  |          std::size_t base_size() const exprtk_override 
  |          { 
  |             return std::min( 
  |                vec0_node_ptr_->vec_holder().base_size(), 
  |                vec1_node_ptr_->vec_holder().base_size()); 
  |          } 
  |  
  |          vds_t& vds() exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |          const vds_t& vds() const exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |       private: 
  |  
  |          vector_node<T>* vec0_node_ptr_; 
  |          vector_node<T>* vec1_node_ptr_; 
  |          bool            initialised_; 
  |          vds_t           vds_; 
  |       }; 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       template <typename T> 
  |       class stringvar_node exprtk_final 
  |                            : public expression_node <T> 
  |                            , public string_base_node<T> 
  |                            , public range_interface <T> 
  |       { 
  |       public: 
  |  
  |          typedef typename range_interface<T>::range_t range_t; 
  |  
  |          static std::string null_value; 
  |  
  |          explicit stringvar_node() 
  |          : value_(&null_value) 
  |          {} 
  |  
  |          explicit stringvar_node(std::string& v) 
  |          : value_(&v) 
  |          { 
  |             rp_.n0_c = std::make_pair<bool,std::size_t>(true,0); 
  |             rp_.n1_c = std::make_pair<bool,std::size_t>(true,v.size()); 
  |             rp_.cache.first  = rp_.n0_c.second; 
  |             rp_.cache.second = rp_.n1_c.second; 
  |          } 
  |  
  |          inline bool operator <(const stringvar_node<T>& v) const 
  |          { 
  |             return this < (&v); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             rp_.n1_c.second  = (*value_).size(); 
  |             rp_.cache.second = rp_.n1_c.second; 
  |  
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          std::string str() const exprtk_override 
  |          { 
  |             return ref(); 
  |          } 
  |  
  |          char_cptr base() const exprtk_override 
  |          { 
  |             return &(*value_)[0]; 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return ref().size(); 
  |          } 
  |  
  |          std::string& ref() 
  |          { 
  |             return (*value_); 
  |          } 
  |  
  |          const std::string& ref() const 
  |          { 
  |             return (*value_); 
  |          } 
  |  
  |          range_t& range_ref() exprtk_override 
  |          { 
  |             return rp_; 
  |          } 
  |  
  |          const range_t& range_ref() const exprtk_override 
  |          { 
  |             return rp_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_stringvar; 
  |          } 
  |  
  |          void rebase(std::string& s) 
  |          { 
  |             value_ = &s; 
  |             rp_.n0_c = std::make_pair<bool,std::size_t>(true,0); 
  |             rp_.n1_c = std::make_pair<bool,std::size_t>(true,value_->size() - 1); 
  |             rp_.cache.first  = rp_.n0_c.second; 
  |             rp_.cache.second = rp_.n1_c.second; 
  |          } 
  |  
  |       private: 
  |  
  |          std::string* value_; 
  |          mutable range_t rp_; 
  |       }; 
  |  
  |       template <typename T> 
  |       std::string stringvar_node<T>::null_value = std::string(""); 
  |  
  |       template <typename T> 
  |       class string_range_node exprtk_final 
  |                               : public expression_node <T> 
  |                               , public string_base_node<T> 
  |                               , public range_interface <T> 
  |       { 
  |       public: 
  |  
  |          typedef typename range_interface<T>::range_t range_t; 
  |  
  |          static std::string null_value; 
  |  
  |          explicit string_range_node(std::string& v, const range_t& rp) 
  |          : value_(&v) 
  |          , rp_(rp) 
  |          {} 
  |  
  |          virtual ~string_range_node() 
  |          { 
  |             rp_.free(); 
  |          } 
  |  
  |          inline bool operator <(const string_range_node<T>& v) const 
  |          { 
  |             return this < (&v); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          inline std::string str() const exprtk_override 
  |          { 
  |             return (*value_); 
  |          } 
  |  
  |          char_cptr base() const exprtk_override 
  |          { 
  |             return &(*value_)[0]; 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return ref().size(); 
  |          } 
  |  
  |          inline range_t range() const 
  |          { 
  |             return rp_; 
  |          } 
  |  
  |          inline virtual std::string& ref() 
  |          { 
  |             return (*value_); 
  |          } 
  |  
  |          inline virtual const std::string& ref() const 
  |          { 
  |             return (*value_); 
  |          } 
  |  
  |          inline range_t& range_ref() exprtk_override 
  |          { 
  |             return rp_; 
  |          } 
  |  
  |          inline const range_t& range_ref() const exprtk_override 
  |          { 
  |             return rp_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_stringvarrng; 
  |          } 
  |  
  |       private: 
  |  
  |          std::string* value_; 
  |          range_t      rp_; 
  |       }; 
  |  
  |       template <typename T> 
  |       std::string string_range_node<T>::null_value = std::string(""); 
  |  
  |       template <typename T> 
  |       class const_string_range_node exprtk_final 
  |                                     : public expression_node <T> 
  |                                     , public string_base_node<T> 
  |                                     , public range_interface <T> 
  |       { 
  |       public: 
  |  
  |          typedef typename range_interface<T>::range_t range_t; 
  |  
  |          explicit const_string_range_node(const std::string& v, const range_t& rp) 
  |          : value_(v) 
  |          , rp_(rp) 
  |          {} 
  |  
  |         ~const_string_range_node() 
  |          { 
  |             rp_.free(); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          std::string str() const exprtk_override 
  |          { 
  |             return value_; 
  |          } 
  |  
  |          char_cptr base() const exprtk_override 
  |          { 
  |             return value_.data(); 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return value_.size(); 
  |          } 
  |  
  |          range_t range() const 
  |          { 
  |             return rp_; 
  |          } 
  |  
  |          range_t& range_ref() exprtk_override 
  |          { 
  |             return rp_; 
  |          } 
  |  
  |          const range_t& range_ref() const exprtk_override 
  |          { 
  |             return rp_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_cstringvarrng; 
  |          } 
  |  
  |       private: 
  |  
  |          const_string_range_node(const const_string_range_node<T>&) exprtk_delete; 
  |          const_string_range_node<T>& operator=(const const_string_range_node<T>&) exprtk_delete; 
  |  
  |          const std::string value_; 
  |          range_t rp_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class generic_string_range_node exprtk_final 
  |                                       : public expression_node <T> 
  |                                       , public string_base_node<T> 
  |                                       , public range_interface <T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node <T>* expression_ptr; 
  |          typedef stringvar_node  <T>* strvar_node_ptr; 
  |          typedef string_base_node<T>* str_base_ptr; 
  |          typedef typename range_interface<T>::range_t range_t; 
  |          typedef range_t*             range_ptr; 
  |          typedef range_interface<T>   irange_t; 
  |          typedef irange_t*            irange_ptr; 
  |          typedef std::pair<expression_ptr,bool>  branch_t; 
  |  
  |          generic_string_range_node(expression_ptr str_branch, const range_t& brange) 
  |          : initialised_(false) 
  |          , str_base_ptr_ (0) 
  |          , str_range_ptr_(0) 
  |          , base_range_(brange) 
  |          { 
  |             range_.n0_c = std::make_pair<bool,std::size_t>(true,0); 
  |             range_.n1_c = std::make_pair<bool,std::size_t>(true,0); 
  |             range_.cache.first  = range_.n0_c.second; 
  |             range_.cache.second = range_.n1_c.second; 
  |  
  |             construct_branch_pair(branch_, str_branch); 
  |  
  |             if (is_generally_string_node(branch_.first)) 
  |             { 
  |                str_base_ptr_ = dynamic_cast<str_base_ptr>(branch_.first); 
  |  
  |                if (0 == str_base_ptr_) 
  |                   return; 
  |  
  |                str_range_ptr_ = dynamic_cast<irange_ptr>(branch_.first); 
  |  
  |                if (0 == str_range_ptr_) 
  |                   return; 
  |             } 
  |  
  |             initialised_ = (str_base_ptr_ && str_range_ptr_); 
  |             assert(valid()); 
  |          } 
  |  
  |         ~generic_string_range_node() 
  |          { 
  |             base_range_.free(); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             branch_.first->value(); 
  |  
  |             std::size_t str_r0 = 0; 
  |             std::size_t str_r1 = 0; 
  |  
  |             std::size_t r0 = 0; 
  |             std::size_t r1 = 0; 
  |  
  |             const range_t& range = str_range_ptr_->range_ref(); 
  |  
  |             const std::size_t base_str_size = str_base_ptr_->size(); 
  |  
  |             if ( 
  |                   range      (str_r0, str_r1, base_str_size         ) && 
  |                   base_range_(r0    , r1    , base_str_size - str_r0) 
  |                ) 
  |             { 
  |                const std::size_t size = r1 - r0; 
  |  
  |                range_.n1_c.second  = size; 
  |                range_.cache.second = range_.n1_c.second; 
  |  
  |                value_.assign(str_base_ptr_->base() + str_r0 + r0, size); 
  |             } 
  |  
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          std::string str() const exprtk_override 
  |          { 
  |             return value_; 
  |          } 
  |  
  |          char_cptr base() const exprtk_override 
  |          { 
  |             return &value_[0]; 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return value_.size(); 
  |          } 
  |  
  |          range_t& range_ref() exprtk_override 
  |          { 
  |             return range_; 
  |          } 
  |  
  |          const range_t& range_ref() const exprtk_override 
  |          { 
  |             return range_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_strgenrange; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return initialised_ && branch_.first; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(branch_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(branch_); 
  |          } 
  |  
  |       private: 
  |  
  |          bool                initialised_; 
  |          branch_t            branch_; 
  |          str_base_ptr        str_base_ptr_; 
  |          irange_ptr          str_range_ptr_; 
  |          mutable range_t     base_range_; 
  |          mutable range_t     range_; 
  |          mutable std::string value_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class string_concat_node exprtk_final 
  |                                : public binary_node     <T> 
  |                                , public string_base_node<T> 
  |                                , public range_interface <T> 
  |       { 
  |       public: 
  |  
  |          typedef typename range_interface<T>::range_t range_t; 
  |          typedef range_interface<T>   irange_t; 
  |          typedef irange_t*            irange_ptr; 
  |          typedef range_t*             range_ptr; 
  |          typedef expression_node <T>* expression_ptr; 
  |          typedef string_base_node<T>* str_base_ptr; 
  |  
  |          using binary_node<T>::branch; 
  |  
  |          string_concat_node(const operator_type& opr, 
  |                             expression_ptr branch0, 
  |                             expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , initialised_(false) 
  |          , str0_base_ptr_ (0) 
  |          , str1_base_ptr_ (0) 
  |          , str0_range_ptr_(0) 
  |          , str1_range_ptr_(0) 
  |          { 
  |             range_.n0_c = std::make_pair<bool,std::size_t>(true,0); 
  |             range_.n1_c = std::make_pair<bool,std::size_t>(true,0); 
  |  
  |             range_.cache.first  = range_.n0_c.second; 
  |             range_.cache.second = range_.n1_c.second; 
  |  
  |             if (is_generally_string_node(branch(0))) 
  |             { 
  |                str0_base_ptr_ = dynamic_cast<str_base_ptr>(branch(0)); 
  |  
  |                if (0 == str0_base_ptr_) 
  |                   return; 
  |  
  |                str0_range_ptr_ = dynamic_cast<irange_ptr>(branch(0)); 
  |  
  |                if (0 == str0_range_ptr_) 
  |                   return; 
  |             } 
  |  
  |             if (is_generally_string_node(branch(1))) 
  |             { 
  |                str1_base_ptr_ = dynamic_cast<str_base_ptr>(branch(1)); 
  |  
  |                if (0 == str1_base_ptr_) 
  |                   return; 
  |  
  |                str1_range_ptr_ = dynamic_cast<irange_ptr>(branch(1)); 
  |  
  |                if (0 == str1_range_ptr_) 
  |                   return; 
  |             } 
  |  
  |             initialised_ = str0_base_ptr_  && 
  |                            str1_base_ptr_  && 
  |                            str0_range_ptr_ && 
  |                            str1_range_ptr_ ; 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             branch(0)->value(); 
  |             branch(1)->value(); 
  |  
  |             std::size_t str0_r0 = 0; 
  |             std::size_t str0_r1 = 0; 
  |  
  |             std::size_t str1_r0 = 0; 
  |             std::size_t str1_r1 = 0; 
  |  
  |             const range_t& range0 = str0_range_ptr_->range_ref(); 
  |             const range_t& range1 = str1_range_ptr_->range_ref(); 
  |  
  |             if ( 
  |                   range0(str0_r0, str0_r1, str0_base_ptr_->size()) && 
  |                   range1(str1_r0, str1_r1, str1_base_ptr_->size()) 
  |                ) 
  |             { 
  |                const std::size_t size0 = (str0_r1 - str0_r0); 
  |                const std::size_t size1 = (str1_r1 - str1_r0); 
  |  
  |                value_.assign(str0_base_ptr_->base() + str0_r0, size0); 
  |                value_.append(str1_base_ptr_->base() + str1_r0, size1); 
  |  
  |                range_.n1_c.second  = value_.size(); 
  |                range_.cache.second = range_.n1_c.second; 
  |             } 
  |  
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          std::string str() const exprtk_override 
  |          { 
  |             return value_; 
  |          } 
  |  
  |          char_cptr base() const exprtk_override 
  |          { 
  |             return &value_[0]; 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return value_.size(); 
  |          } 
  |  
  |          range_t& range_ref() exprtk_override 
  |          { 
  |             return range_; 
  |          } 
  |  
  |          const range_t& range_ref() const exprtk_override 
  |          { 
  |             return range_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_strconcat; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return initialised_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          bool                initialised_; 
  |          str_base_ptr        str0_base_ptr_; 
  |          str_base_ptr        str1_base_ptr_; 
  |          irange_ptr          str0_range_ptr_; 
  |          irange_ptr          str1_range_ptr_; 
  |          mutable range_t     range_; 
  |          mutable std::string value_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class swap_string_node exprtk_final 
  |                              : public binary_node     <T> 
  |                              , public string_base_node<T> 
  |                              , public range_interface <T> 
  |       { 
  |       public: 
  |  
  |          typedef typename range_interface<T>::range_t range_t; 
  |          typedef range_t*             range_ptr; 
  |          typedef range_interface<T>   irange_t; 
  |          typedef irange_t*            irange_ptr; 
  |          typedef expression_node <T>* expression_ptr; 
  |          typedef stringvar_node  <T>* strvar_node_ptr; 
  |          typedef string_base_node<T>* str_base_ptr; 
  |  
  |          using binary_node<T>::branch; 
  |  
  |          swap_string_node(expression_ptr branch0, expression_ptr branch1) 
  |          : binary_node<T>(details::e_swap, branch0, branch1) 
  |          , initialised_(false) 
  |          , str0_node_ptr_(0) 
  |          , str1_node_ptr_(0) 
  |          { 
  |             if (is_string_node(branch(0))) 
  |             { 
  |                str0_node_ptr_ = static_cast<strvar_node_ptr>(branch(0)); 
  |             } 
  |  
  |             if (is_string_node(branch(1))) 
  |             { 
  |                str1_node_ptr_ = static_cast<strvar_node_ptr>(branch(1)); 
  |             } 
  |  
  |             initialised_ = (str0_node_ptr_ && str1_node_ptr_); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             branch(0)->value(); 
  |             branch(1)->value(); 
  |  
  |             std::swap(str0_node_ptr_->ref(), str1_node_ptr_->ref()); 
  |  
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          std::string str() const exprtk_override 
  |          { 
  |             return str0_node_ptr_->str(); 
  |          } 
  |  
  |          char_cptr base() const exprtk_override 
  |          { 
  |            return str0_node_ptr_->base(); 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return str0_node_ptr_->size(); 
  |          } 
  |  
  |          range_t& range_ref() exprtk_override 
  |          { 
  |             return str0_node_ptr_->range_ref(); 
  |          } 
  |  
  |          const range_t& range_ref() const exprtk_override 
  |          { 
  |             return str0_node_ptr_->range_ref(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_strswap; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return initialised_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          bool initialised_; 
  |          strvar_node_ptr str0_node_ptr_; 
  |          strvar_node_ptr str1_node_ptr_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class swap_genstrings_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef typename range_interface<T>::range_t range_t; 
  |          typedef range_t*             range_ptr; 
  |          typedef range_interface<T>   irange_t; 
  |          typedef irange_t*            irange_ptr; 
  |          typedef expression_node <T>* expression_ptr; 
  |          typedef string_base_node<T>* str_base_ptr; 
  |  
  |          using binary_node<T>::branch; 
  |  
  |          swap_genstrings_node(expression_ptr branch0, 
  |                               expression_ptr branch1) 
  |          : binary_node<T>(details::e_default, branch0, branch1) 
  |          , str0_base_ptr_ (0) 
  |          , str1_base_ptr_ (0) 
  |          , str0_range_ptr_(0) 
  |          , str1_range_ptr_(0) 
  |          , initialised_(false) 
  |          { 
  |             if (is_generally_string_node(branch(0))) 
  |             { 
  |                str0_base_ptr_ = dynamic_cast<str_base_ptr>(branch(0)); 
  |  
  |                if (0 == str0_base_ptr_) 
  |                   return; 
  |  
  |                irange_ptr range = dynamic_cast<irange_ptr>(branch(0)); 
  |  
  |                if (0 == range) 
  |                   return; 
  |  
  |                str0_range_ptr_ = &(range->range_ref()); 
  |             } 
  |  
  |             if (is_generally_string_node(branch(1))) 
  |             { 
  |                str1_base_ptr_ = dynamic_cast<str_base_ptr>(branch(1)); 
  |  
  |                if (0 == str1_base_ptr_) 
  |                   return; 
  |  
  |                irange_ptr range = dynamic_cast<irange_ptr>(branch(1)); 
  |  
  |                if (0 == range) 
  |                   return; 
  |  
  |                str1_range_ptr_ = &(range->range_ref()); 
  |             } 
  |  
  |             initialised_ = str0_base_ptr_  && 
  |                            str1_base_ptr_  && 
  |                            str0_range_ptr_ && 
  |                            str1_range_ptr_ ; 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             branch(0)->value(); 
  |             branch(1)->value(); 
  |  
  |             std::size_t str0_r0 = 0; 
  |             std::size_t str0_r1 = 0; 
  |  
  |             std::size_t str1_r0 = 0; 
  |             std::size_t str1_r1 = 0; 
  |  
  |             const range_t& range0 = (*str0_range_ptr_); 
  |             const range_t& range1 = (*str1_range_ptr_); 
  |  
  |             if ( 
  |                   range0(str0_r0, str0_r1, str0_base_ptr_->size()) && 
  |                   range1(str1_r0, str1_r1, str1_base_ptr_->size()) 
  |                ) 
  |             { 
  |                const std::size_t size0    = range0.cache_size(); 
  |                const std::size_t size1    = range1.cache_size(); 
  |                const std::size_t max_size = std::min(size0,size1); 
  |  
  |                char_ptr s0 = const_cast<char_ptr>(str0_base_ptr_->base() + str0_r0); 
  |                char_ptr s1 = const_cast<char_ptr>(str1_base_ptr_->base() + str1_r0); 
  |  
  |                loop_unroll::details lud(max_size); 
  |                char_cptr upper_bound = s0 + lud.upper_bound; 
  |  
  |                while (s0 < upper_bound) 
  |                { 
  |                   #define exprtk_loop(N)   \ 
  |                   std::swap(s0[N], s1[N]); \ 
  |  
  |                   exprtk_loop( 0) exprtk_loop( 1) 
  |                   exprtk_loop( 2) exprtk_loop( 3) 
  |                   #ifndef exprtk_disable_superscalar_unroll 
  |                   exprtk_loop( 4) exprtk_loop( 5) 
  |                   exprtk_loop( 6) exprtk_loop( 7) 
  |                   exprtk_loop( 8) exprtk_loop( 9) 
  |                   exprtk_loop(10) exprtk_loop(11) 
  |                   exprtk_loop(12) exprtk_loop(13) 
  |                   exprtk_loop(14) exprtk_loop(15) 
  |                   #endif 
  |  
  |                   s0 += lud.batch_size; 
  |                   s1 += lud.batch_size; 
  |                } 
  |  
  |                int i = 0; 
  |  
  |                switch (lud.remainder) 
  |                { 
  |                   #define case_stmt(N)                       \ 
  |                   case N : { std::swap(s0[i], s1[i]); ++i; } \ 
  |                   exprtk_fallthrough                         \ 
  |  
  |                   #ifndef exprtk_disable_superscalar_unroll 
  |                   case_stmt(15) case_stmt(14) 
  |                   case_stmt(13) case_stmt(12) 
  |                   case_stmt(11) case_stmt(10) 
  |                   case_stmt( 9) case_stmt( 8) 
  |                   case_stmt( 7) case_stmt( 6) 
  |                   case_stmt( 5) case_stmt( 4) 
  |                   #endif 
  |                   case_stmt( 3) case_stmt( 2) 
  |                   case_stmt( 1) 
  |                   default: break; 
  |                } 
  |  
  |                #undef exprtk_loop 
  |                #undef case_stmt 
  |             } 
  |  
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_strswap; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return initialised_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          swap_genstrings_node(const swap_genstrings_node<T>&) exprtk_delete; 
  |          swap_genstrings_node<T>& operator=(const swap_genstrings_node<T>&) exprtk_delete; 
  |  
  |          str_base_ptr str0_base_ptr_; 
  |          str_base_ptr str1_base_ptr_; 
  |          range_ptr    str0_range_ptr_; 
  |          range_ptr    str1_range_ptr_; 
  |          bool         initialised_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class stringvar_size_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          static const std::string null_value; 
  |  
  |          explicit stringvar_size_node() 
  |          : value_(&null_value) 
  |          {} 
  |  
  |          explicit stringvar_size_node(std::string& v) 
  |          : value_(&v) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return T((*value_).size()); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_stringvarsize; 
  |          } 
  |  
  |       private: 
  |  
  |          const std::string* value_; 
  |       }; 
  |  
  |       template <typename T> 
  |       const std::string stringvar_size_node<T>::null_value = std::string(""); 
  |  
  |       template <typename T> 
  |       class string_size_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node <T>* expression_ptr; 
  |          typedef string_base_node<T>* str_base_ptr; 
  |          typedef std::pair<expression_ptr,bool>  branch_t; 
  |  
  |          explicit string_size_node(expression_ptr branch) 
  |          : str_base_ptr_(0) 
  |          { 
  |             construct_branch_pair(branch_, branch); 
  |  
  |             if (is_generally_string_node(branch_.first)) 
  |             { 
  |                str_base_ptr_ = dynamic_cast<str_base_ptr>(branch_.first); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             branch_.first->value(); 
  |             return T(str_base_ptr_->size()); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_stringsize; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return str_base_ptr_; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(branch_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(branch_); 
  |          } 
  |  
  |       private: 
  |  
  |          branch_t     branch_; 
  |          str_base_ptr str_base_ptr_; 
  |       }; 
  |  
  |       struct asn_assignment 
  |       { 
  |          static inline void execute(std::string& s, char_cptr data, const std::size_t size) 
  |          { s.assign(data,size); } 
  |       }; 
  |  
  |       struct asn_addassignment 
  |       { 
  |          static inline void execute(std::string& s, char_cptr data, const std::size_t size) 
  |          { s.append(data,size); } 
  |       }; 
  |  
  |       template <typename T, typename AssignmentProcess = asn_assignment> 
  |       class assignment_string_node exprtk_final 
  |                                    : public binary_node     <T> 
  |                                    , public string_base_node<T> 
  |                                    , public range_interface <T> 
  |       { 
  |       public: 
  |  
  |          typedef typename range_interface<T>::range_t range_t; 
  |          typedef range_t*             range_ptr; 
  |          typedef range_interface <T>  irange_t; 
  |          typedef irange_t*            irange_ptr; 
  |          typedef expression_node <T>* expression_ptr; 
  |          typedef stringvar_node  <T>* strvar_node_ptr; 
  |          typedef string_base_node<T>* str_base_ptr; 
  |  
  |          using binary_node<T>::branch; 
  |  
  |          assignment_string_node(const operator_type& opr, 
  |                                 expression_ptr branch0, 
  |                                 expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , initialised_(false) 
  |          , str0_base_ptr_ (0) 
  |          , str1_base_ptr_ (0) 
  |          , str0_node_ptr_ (0) 
  |          , str1_range_ptr_(0) 
  |          { 
  |             if (is_string_node(branch(0))) 
  |             { 
  |                str0_node_ptr_ = static_cast<strvar_node_ptr>(branch(0)); 
  |                str0_base_ptr_ = dynamic_cast<str_base_ptr>(branch(0)); 
  |             } 
  |  
  |             if (is_generally_string_node(branch(1))) 
  |             { 
  |                str1_base_ptr_ = dynamic_cast<str_base_ptr>(branch(1)); 
  |  
  |                if (0 == str1_base_ptr_) 
  |                   return; 
  |  
  |                irange_ptr range = dynamic_cast<irange_ptr>(branch(1)); 
  |  
  |                if (0 == range) 
  |                   return; 
  |  
  |                str1_range_ptr_ = &(range->range_ref()); 
  |             } 
  |  
  |             initialised_ = str0_base_ptr_  && 
  |                            str1_base_ptr_  && 
  |                            str0_node_ptr_  && 
  |                            str1_range_ptr_ ; 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             branch(1)->value(); 
  |  
  |             std::size_t r0 = 0; 
  |             std::size_t r1 = 0; 
  |  
  |             const range_t& range = (*str1_range_ptr_); 
  |  
  |             if (range(r0, r1, str1_base_ptr_->size())) 
  |             { 
  |                AssignmentProcess::execute( 
  |                   str0_node_ptr_->ref(), 
  |                   str1_base_ptr_->base() + r0, (r1 - r0)); 
  |  
  |                branch(0)->value(); 
  |             } 
  |  
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          std::string str() const exprtk_override 
  |          { 
  |             return str0_node_ptr_->str(); 
  |          } 
  |  
  |          char_cptr base() const exprtk_override 
  |          { 
  |            return str0_node_ptr_->base(); 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return str0_node_ptr_->size(); 
  |          } 
  |  
  |          range_t& range_ref() exprtk_override 
  |          { 
  |             return str0_node_ptr_->range_ref(); 
  |          } 
  |  
  |          const range_t& range_ref() const exprtk_override 
  |          { 
  |             return str0_node_ptr_->range_ref(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_strass; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return initialised_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          bool            initialised_; 
  |          str_base_ptr    str0_base_ptr_; 
  |          str_base_ptr    str1_base_ptr_; 
  |          strvar_node_ptr str0_node_ptr_; 
  |          range_ptr       str1_range_ptr_; 
  |       }; 
  |  
  |       template <typename T, typename AssignmentProcess = asn_assignment> 
  |       class assignment_string_range_node exprtk_final 
  |                                          : public binary_node     <T> 
  |                                          , public string_base_node<T> 
  |                                          , public range_interface <T> 
  |       { 
  |       public: 
  |  
  |          typedef typename range_interface<T>::range_t range_t; 
  |          typedef range_t*              range_ptr; 
  |          typedef range_interface  <T>  irange_t; 
  |          typedef irange_t*             irange_ptr; 
  |          typedef expression_node  <T>* expression_ptr; 
  |          typedef stringvar_node   <T>* strvar_node_ptr; 
  |          typedef string_range_node<T>* str_rng_node_ptr; 
  |          typedef string_base_node <T>* str_base_ptr; 
  |  
  |          using binary_node<T>::branch; 
  |  
  |          assignment_string_range_node(const operator_type& opr, 
  |                                       expression_ptr branch0, 
  |                                       expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , initialised_(false) 
  |          , str0_base_ptr_    (0) 
  |          , str1_base_ptr_    (0) 
  |          , str0_rng_node_ptr_(0) 
  |          , str0_range_ptr_   (0) 
  |          , str1_range_ptr_   (0) 
  |          { 
  |             if (is_string_range_node(branch(0))) 
  |             { 
  |                str0_rng_node_ptr_ = static_cast<str_rng_node_ptr>(branch(0)); 
  |                str0_base_ptr_     = dynamic_cast<str_base_ptr>(branch(0)); 
  |                irange_ptr range   = dynamic_cast<irange_ptr>(branch(0)); 
  |  
  |                if (0 == range) 
  |                   return; 
  |  
  |                str0_range_ptr_ = &(range->range_ref()); 
  |             } 
  |  
  |             if (is_generally_string_node(branch(1))) 
  |             { 
  |                str1_base_ptr_ = dynamic_cast<str_base_ptr>(branch(1)); 
  |  
  |                if (0 == str1_base_ptr_) 
  |                   return; 
  |  
  |                irange_ptr range = dynamic_cast<irange_ptr>(branch(1)); 
  |  
  |                if (0 == range) 
  |                   return; 
  |  
  |                str1_range_ptr_ = &(range->range_ref()); 
  |             } 
  |  
  |             initialised_ = str0_base_ptr_     && 
  |                            str1_base_ptr_     && 
  |                            str0_rng_node_ptr_ && 
  |                            str0_range_ptr_    && 
  |                            str1_range_ptr_    ; 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             branch(0)->value(); 
  |             branch(1)->value(); 
  |  
  |             std::size_t s0_r0 = 0; 
  |             std::size_t s0_r1 = 0; 
  |  
  |             std::size_t s1_r0 = 0; 
  |             std::size_t s1_r1 = 0; 
  |  
  |             const range_t& range0 = (*str0_range_ptr_); 
  |             const range_t& range1 = (*str1_range_ptr_); 
  |  
  |             if ( 
  |                   range0(s0_r0, s0_r1, str0_base_ptr_->size()) && 
  |                   range1(s1_r0, s1_r1, str1_base_ptr_->size()) 
  |                ) 
  |             { 
  |                const std::size_t size = std::min((s0_r1 - s0_r0), (s1_r1 - s1_r0)); 
  |  
  |                std::copy( 
  |                   str1_base_ptr_->base() + s1_r0, 
  |                   str1_base_ptr_->base() + s1_r0 + size, 
  |                   const_cast<char_ptr>(base() + s0_r0)); 
  |             } 
  |  
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          std::string str() const exprtk_override 
  |          { 
  |             return str0_base_ptr_->str(); 
  |          } 
  |  
  |          char_cptr base() const exprtk_override 
  |          { 
  |             return str0_base_ptr_->base(); 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return str0_base_ptr_->size(); 
  |          } 
  |  
  |          range_t& range_ref() exprtk_override 
  |          { 
  |             return str0_rng_node_ptr_->range_ref(); 
  |          } 
  |  
  |          const range_t& range_ref() const exprtk_override 
  |          { 
  |             return str0_rng_node_ptr_->range_ref(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_strass; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return initialised_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          bool             initialised_; 
  |          str_base_ptr     str0_base_ptr_; 
  |          str_base_ptr     str1_base_ptr_; 
  |          str_rng_node_ptr str0_rng_node_ptr_; 
  |          range_ptr        str0_range_ptr_; 
  |          range_ptr        str1_range_ptr_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class conditional_string_node exprtk_final 
  |                                     : public trinary_node    <T> 
  |                                     , public string_base_node<T> 
  |                                     , public range_interface <T> 
  |       { 
  |       public: 
  |  
  |          typedef typename range_interface<T>::range_t range_t; 
  |          typedef range_t*             range_ptr; 
  |          typedef range_interface <T>  irange_t; 
  |          typedef irange_t*            irange_ptr; 
  |          typedef expression_node <T>* expression_ptr; 
  |          typedef string_base_node<T>* str_base_ptr; 
  |  
  |          conditional_string_node(expression_ptr condition, 
  |                                  expression_ptr consequent, 
  |                                  expression_ptr alternative) 
  |          : trinary_node<T>(details::e_default, consequent, alternative, condition) 
  |          , initialised_(false) 
  |          , str0_base_ptr_ (0) 
  |          , str1_base_ptr_ (0) 
  |          , str0_range_ptr_(0) 
  |          , str1_range_ptr_(0) 
  |          , condition_  (condition  ) 
  |          , consequent_ (consequent ) 
  |          , alternative_(alternative) 
  |          { 
  |             range_.n0_c = std::make_pair<bool,std::size_t>(true,0); 
  |             range_.n1_c = std::make_pair<bool,std::size_t>(true,0); 
  |  
  |             range_.cache.first  = range_.n0_c.second; 
  |             range_.cache.second = range_.n1_c.second; 
  |  
  |             if (is_generally_string_node(trinary_node<T>::branch_[0].first)) 
  |             { 
  |                str0_base_ptr_ = dynamic_cast<str_base_ptr>(trinary_node<T>::branch_[0].first); 
  |  
  |                if (0 == str0_base_ptr_) 
  |                   return; 
  |  
  |                str0_range_ptr_ = dynamic_cast<irange_ptr>(trinary_node<T>::branch_[0].first); 
  |  
  |                if (0 == str0_range_ptr_) 
  |                   return; 
  |             } 
  |  
  |             if (is_generally_string_node(trinary_node<T>::branch_[1].first)) 
  |             { 
  |                str1_base_ptr_ = dynamic_cast<str_base_ptr>(trinary_node<T>::branch_[1].first); 
  |  
  |                if (0 == str1_base_ptr_) 
  |                   return; 
  |  
  |                str1_range_ptr_ = dynamic_cast<irange_ptr>(trinary_node<T>::branch_[1].first); 
  |  
  |                if (0 == str1_range_ptr_) 
  |                   return; 
  |             } 
  |  
  |             initialised_ = str0_base_ptr_  && 
  |                            str1_base_ptr_  && 
  |                            str0_range_ptr_ && 
  |                            str1_range_ptr_ ; 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             std::size_t r0 = 0; 
  |             std::size_t r1 = 0; 
  |  
  |             if (is_true(condition_)) 
  |             { 
  |                consequent_->value(); 
  |  
  |                const range_t& range = str0_range_ptr_->range_ref(); 
  |  
  |                if (range(r0, r1, str0_base_ptr_->size())) 
  |                { 
  |                   const std::size_t size = (r1 - r0); 
  |  
  |                   value_.assign(str0_base_ptr_->base() + r0, size); 
  |  
  |                   range_.n1_c.second  = value_.size(); 
  |                   range_.cache.second = range_.n1_c.second; 
  |  
  |                   return T(1); 
  |                } 
  |             } 
  |             else 
  |             { 
  |                alternative_->value(); 
  |  
  |                const range_t& range = str1_range_ptr_->range_ref(); 
  |  
  |                if (range(r0, r1, str1_base_ptr_->size())) 
  |                { 
  |                   const std::size_t size = (r1 - r0); 
  |  
  |                   value_.assign(str1_base_ptr_->base() + r0, size); 
  |  
  |                   range_.n1_c.second  = value_.size(); 
  |                   range_.cache.second = range_.n1_c.second; 
  |  
  |                   return T(0); 
  |                } 
  |             } 
  |  
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          std::string str() const exprtk_override 
  |          { 
  |             return value_; 
  |          } 
  |  
  |          char_cptr base() const exprtk_override 
  |          { 
  |             return &value_[0]; 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return value_.size(); 
  |          } 
  |  
  |          range_t& range_ref() exprtk_override 
  |          { 
  |             return range_; 
  |          } 
  |  
  |          const range_t& range_ref() const exprtk_override 
  |          { 
  |             return range_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_strcondition; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                initialised_                         && 
  |                condition_  && condition_  ->valid() && 
  |                consequent_ && consequent_ ->valid() && 
  |                alternative_&& alternative_->valid() ; 
  |          } 
  |  
  |       private: 
  |  
  |          bool initialised_; 
  |          str_base_ptr str0_base_ptr_; 
  |          str_base_ptr str1_base_ptr_; 
  |          irange_ptr   str0_range_ptr_; 
  |          irange_ptr   str1_range_ptr_; 
  |          mutable range_t     range_; 
  |          mutable std::string value_; 
  |  
  |          expression_ptr condition_; 
  |          expression_ptr consequent_; 
  |          expression_ptr alternative_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class cons_conditional_str_node exprtk_final 
  |                                       : public binary_node     <T> 
  |                                       , public string_base_node<T> 
  |                                       , public range_interface <T> 
  |       { 
  |       public: 
  |  
  |          typedef typename range_interface<T>::range_t range_t; 
  |          typedef range_t*             range_ptr; 
  |          typedef range_interface <T>  irange_t; 
  |          typedef irange_t*            irange_ptr; 
  |          typedef expression_node <T>* expression_ptr; 
  |          typedef string_base_node<T>* str_base_ptr; 
  |  
  |          using binary_node<T>::branch; 
  |  
  |          cons_conditional_str_node(expression_ptr condition, 
  |                                    expression_ptr consequent) 
  |          : binary_node<T>(details::e_default, consequent, condition) 
  |          , initialised_(false) 
  |          , str0_base_ptr_ (0) 
  |          , str0_range_ptr_(0) 
  |          , condition_ (condition ) 
  |          , consequent_(consequent) 
  |          { 
  |             range_.n0_c = std::make_pair<bool,std::size_t>(true,0); 
  |             range_.n1_c = std::make_pair<bool,std::size_t>(true,0); 
  |  
  |             range_.cache.first  = range_.n0_c.second; 
  |             range_.cache.second = range_.n1_c.second; 
  |  
  |             if (is_generally_string_node(branch(0))) 
  |             { 
  |                str0_base_ptr_ = dynamic_cast<str_base_ptr>(branch(0)); 
  |  
  |                if (0 == str0_base_ptr_) 
  |                   return; 
  |  
  |                str0_range_ptr_ = dynamic_cast<irange_ptr>(branch(0)); 
  |  
  |                if (0 == str0_range_ptr_) 
  |                   return; 
  |             } 
  |  
  |             initialised_ = str0_base_ptr_ && str0_range_ptr_ ; 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             if (is_true(condition_)) 
  |             { 
  |                consequent_->value(); 
  |  
  |                const range_t& range = str0_range_ptr_->range_ref(); 
  |  
  |                std::size_t r0 = 0; 
  |                std::size_t r1 = 0; 
  |  
  |                if (range(r0, r1, str0_base_ptr_->size())) 
  |                { 
  |                   const std::size_t size = (r1 - r0); 
  |  
  |                   value_.assign(str0_base_ptr_->base() + r0, size); 
  |  
  |                   range_.n1_c.second  = value_.size(); 
  |                   range_.cache.second = range_.n1_c.second; 
  |  
  |                   return T(1); 
  |                } 
  |             } 
  |  
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          std::string str() const 
  |          { 
  |             return value_; 
  |          } 
  |  
  |          char_cptr base() const 
  |          { 
  |             return &value_[0]; 
  |          } 
  |  
  |          std::size_t size() const 
  |          { 
  |             return value_.size(); 
  |          } 
  |  
  |          range_t& range_ref() 
  |          { 
  |             return range_; 
  |          } 
  |  
  |          const range_t& range_ref() const 
  |          { 
  |             return range_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_strccondition; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                initialised_                         && 
  |                condition_  && condition_  ->valid() && 
  |                consequent_ && consequent_ ->valid() ; 
  |          } 
  |  
  |       private: 
  |  
  |          bool initialised_; 
  |          str_base_ptr str0_base_ptr_; 
  |          irange_ptr   str0_range_ptr_; 
  |          mutable range_t     range_; 
  |          mutable std::string value_; 
  |  
  |          expression_ptr condition_; 
  |          expression_ptr consequent_; 
  |       }; 
  |  
  |       template <typename T, typename VarArgFunction> 
  |       class str_vararg_node exprtk_final 
  |                             : public expression_node <T> 
  |                             , public string_base_node<T> 
  |                             , public range_interface <T> 
  |       { 
  |       public: 
  |  
  |          typedef typename range_interface<T>::range_t range_t; 
  |          typedef range_t*             range_ptr; 
  |          typedef range_interface <T>  irange_t; 
  |          typedef irange_t*            irange_ptr; 
  |          typedef expression_node <T>* expression_ptr; 
  |          typedef string_base_node<T>* str_base_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          explicit str_vararg_node(const Sequence<expression_ptr,Allocator>& arg_list) 
  |          : initialised_(false) 
  |          , str_base_ptr_ (0) 
  |          , str_range_ptr_(0) 
  |          { 
  |             construct_branch_pair(final_node_, const_cast<expression_ptr>(arg_list.back())); 
  |  
  |             if (0 == final_node_.first) 
  |                return; 
  |             else if (!is_generally_string_node(final_node_.first)) 
  |                return; 
  |  
  |             str_base_ptr_ = dynamic_cast<str_base_ptr>(final_node_.first); 
  |  
  |             if (0 == str_base_ptr_) 
  |                return; 
  |  
  |             str_range_ptr_ = dynamic_cast<irange_ptr>(final_node_.first); 
  |  
  |             if (0 == str_range_ptr_) 
  |                return; 
  |  
  |             if (arg_list.size() > 1) 
  |             { 
  |                const std::size_t arg_list_size = arg_list.size() - 1; 
  |  
  |                arg_list_.resize(arg_list_size); 
  |  
  |                for (std::size_t i = 0; i < arg_list_size; ++i) 
  |                { 
  |                   if (arg_list[i] && arg_list[i]->valid()) 
  |                   { 
  |                      construct_branch_pair(arg_list_[i], arg_list[i]); 
  |                   } 
  |                   else 
  |                   { 
  |                      arg_list_.clear(); 
  |                      return; 
  |                   } 
  |                } 
  |  
  |                initialised_ = true; 
  |             } 
  |  
  |             initialised_ &= str_base_ptr_ && str_range_ptr_; 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             if (!arg_list_.empty()) 
  |             { 
  |                VarArgFunction::process(arg_list_); 
  |             } 
  |  
  |             final_node_.first->value(); 
  |  
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          std::string str() const exprtk_override 
  |          { 
  |             return str_base_ptr_->str(); 
  |          } 
  |  
  |          char_cptr base() const exprtk_override 
  |          { 
  |             return str_base_ptr_->base(); 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return str_base_ptr_->size(); 
  |          } 
  |  
  |          range_t& range_ref() exprtk_override 
  |          { 
  |             return str_range_ptr_->range_ref(); 
  |          } 
  |  
  |          const range_t& range_ref() const exprtk_override 
  |          { 
  |             return str_range_ptr_->range_ref(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_stringvararg; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                initialised_ && 
  |                final_node_.first && final_node_.first->valid(); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(final_node_ , node_delete_list); 
  |             expression_node<T>::ndb_t::collect(arg_list_   , node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return std::max( 
  |                expression_node<T>::ndb_t::compute_node_depth(final_node_), 
  |                expression_node<T>::ndb_t::compute_node_depth(arg_list_  )); 
  |          } 
  |  
  |       private: 
  |  
  |          bool                  initialised_; 
  |          branch_t              final_node_; 
  |          str_base_ptr          str_base_ptr_; 
  |          irange_ptr            str_range_ptr_; 
  |          std::vector<branch_t> arg_list_; 
  |       }; 
  |       #endif 
  |  
  |       template <typename T> 
  |       class assert_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |          typedef string_base_node<T>* str_base_ptr; 
  |          typedef assert_check::assert_context assert_context_t; 
  |  
  |          assert_node(expression_ptr   assert_condition_node, 
  |                      expression_ptr   assert_message_node, 
  |                      assert_check_ptr assert_check, 
  |                      assert_context_t context) 
  |          : assert_message_str_base_(0) 
  |          , assert_check_(assert_check) 
  |          , context_(context) 
  |          { 
  |             construct_branch_pair(assert_condition_node_, assert_condition_node); 
  |             construct_branch_pair(assert_message_node_  , assert_message_node  ); 
  |  
  |             #ifndef exprtk_disable_string_capabilities 
  |             if ( 
  |                   assert_message_node_.first && 
  |                   details::is_generally_string_node(assert_message_node_.first) 
  |                ) 
  |             { 
  |                assert_message_str_base_ = dynamic_cast<str_base_ptr>(assert_message_node_.first); 
  |             } 
  |             #endif 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             if (details::is_true(assert_condition_node_.first->value())) 
  |             { 
  |                return T(1); 
  |             } 
  |  
  |             #ifndef exprtk_disable_string_capabilities 
  |             if (assert_message_node_.first) 
  |             { 
  |                assert_message_node_.first->value(); 
  |                assert(assert_message_str_base_); 
  |                context_.message = assert_message_str_base_->str(); 
  |             } 
  |             #endif 
  |  
  |             assert_check_->handle_assert(context_); 
  |             return T(0); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_assert; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return ( 
  |                      assert_check_ && 
  |                      assert_condition_node_.first && 
  |                      assert_condition_node_.first->valid() 
  |                    ) && 
  |                    ( 
  |                      (0 == assert_message_node_.first) || 
  |                      ( 
  |                        assert_message_node_.first && 
  |                        assert_message_str_base_   && 
  |                        assert_message_node_.first->valid() && 
  |                        details::is_generally_string_node(assert_message_node_.first) 
  |                      ) 
  |                    ); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(assert_condition_node_, node_delete_list); 
  |             expression_node<T>::ndb_t::collect(assert_message_node_  , node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth 
  |                (assert_condition_node_, assert_message_node_); 
  |          } 
  |  
  |       private: 
  |  
  |          branch_t         assert_condition_node_; 
  |          branch_t         assert_message_node_; 
  |          str_base_ptr     assert_message_str_base_; 
  |          assert_check_ptr assert_check_; 
  |          mutable assert_context_t context_; 
  |       }; 
  |  
  |       template <typename T, std::size_t N> 
  |       inline T axn(const T a, const T x) 
  |       { 
  |          // a*x^n 
  |          return a * exprtk::details::numeric::fast_exp<T,N>::result(x); 
  |       } 
  |  
  |       template <typename T, std::size_t N> 
  |       inline T axnb(const T a, const T x, const T b) 
  |       { 
  |          // a*x^n+b 
  |          return a * exprtk::details::numeric::fast_exp<T,N>::result(x) + b; 
  |       } 
  |  
  |       template <typename T> 
  |       struct sf_base 
  |       { 
  |          typedef typename details::functor_t<T>::Type Type; 
  |          typedef typename details::functor_t<T> functor_t; 
  |          typedef typename functor_t::qfunc_t quaternary_functor_t; 
  |          typedef typename functor_t::tfunc_t trinary_functor_t; 
  |          typedef typename functor_t::bfunc_t binary_functor_t; 
  |          typedef typename functor_t::ufunc_t unary_functor_t; 
  |       }; 
  |  
  |       #define define_sfop3(NN, OP0, OP1)                 \ 
  |       template <typename T>                              \ 
  |       struct sf##NN##_op : public sf_base<T>             \ 
  |       {                                                  \ 
  |          typedef typename sf_base<T>::Type const Type;   \ 
  |          static inline T process(Type x, Type y, Type z) \ 
  |          {                                               \ 
  |             return (OP0);                                \ 
  |          }                                               \ 
  |          static inline std::string id()                  \ 
  |          {                                               \ 
  |             return (OP1);                                \ 
  |          }                                               \ 
  |       };                                                 \ 
  |  
  |       define_sfop3(00,(x + y) / z       ,"(t+t)/t") 
  |       define_sfop3(01,(x + y) * z       ,"(t+t)*t") 
  |       define_sfop3(02,(x + y) - z       ,"(t+t)-t") 
  |       define_sfop3(03,(x + y) + z       ,"(t+t)+t") 
  |       define_sfop3(04,(x - y) + z       ,"(t-t)+t") 
  |       define_sfop3(05,(x - y) / z       ,"(t-t)/t") 
  |       define_sfop3(06,(x - y) * z       ,"(t-t)*t") 
  |       define_sfop3(07,(x * y) + z       ,"(t*t)+t") 
  |       define_sfop3(08,(x * y) - z       ,"(t*t)-t") 
  |       define_sfop3(09,(x * y) / z       ,"(t*t)/t") 
  |       define_sfop3(10,(x * y) * z       ,"(t*t)*t") 
  |       define_sfop3(11,(x / y) + z       ,"(t/t)+t") 
  |       define_sfop3(12,(x / y) - z       ,"(t/t)-t") 
  |       define_sfop3(13,(x / y) / z       ,"(t/t)/t") 
  |       define_sfop3(14,(x / y) * z       ,"(t/t)*t") 
  |       define_sfop3(15,x / (y + z)       ,"t/(t+t)") 
  |       define_sfop3(16,x / (y - z)       ,"t/(t-t)") 
  |       define_sfop3(17,x / (y * z)       ,"t/(t*t)") 
  |       define_sfop3(18,x / (y / z)       ,"t/(t/t)") 
  |       define_sfop3(19,x * (y + z)       ,"t*(t+t)") 
  |       define_sfop3(20,x * (y - z)       ,"t*(t-t)") 
  |       define_sfop3(21,x * (y * z)       ,"t*(t*t)") 
  |       define_sfop3(22,x * (y / z)       ,"t*(t/t)") 
  |       define_sfop3(23,x - (y + z)       ,"t-(t+t)") 
  |       define_sfop3(24,x - (y - z)       ,"t-(t-t)") 
  |       define_sfop3(25,x - (y / z)       ,"t-(t/t)") 
  |       define_sfop3(26,x - (y * z)       ,"t-(t*t)") 
  |       define_sfop3(27,x + (y * z)       ,"t+(t*t)") 
  |       define_sfop3(28,x + (y / z)       ,"t+(t/t)") 
  |       define_sfop3(29,x + (y + z)       ,"t+(t+t)") 
  |       define_sfop3(30,x + (y - z)       ,"t+(t-t)") 
  |       define_sfop3(31,(axnb<T,2>(x,y,z)),"       ") 
  |       define_sfop3(32,(axnb<T,3>(x,y,z)),"       ") 
  |       define_sfop3(33,(axnb<T,4>(x,y,z)),"       ") 
  |       define_sfop3(34,(axnb<T,5>(x,y,z)),"       ") 
  |       define_sfop3(35,(axnb<T,6>(x,y,z)),"       ") 
  |       define_sfop3(36,(axnb<T,7>(x,y,z)),"       ") 
  |       define_sfop3(37,(axnb<T,8>(x,y,z)),"       ") 
  |       define_sfop3(38,(axnb<T,9>(x,y,z)),"       ") 
  |       define_sfop3(39,x * numeric::log(y)   + z,"") 
  |       define_sfop3(40,x * numeric::log(y)   - z,"") 
  |       define_sfop3(41,x * numeric::log10(y) + z,"") 
  |       define_sfop3(42,x * numeric::log10(y) - z,"") 
  |       define_sfop3(43,x * numeric::sin(y) + z  ,"") 
  |       define_sfop3(44,x * numeric::sin(y) - z  ,"") 
  |       define_sfop3(45,x * numeric::cos(y) + z  ,"") 
  |       define_sfop3(46,x * numeric::cos(y) - z  ,"") 
  |       define_sfop3(47,details::is_true(x) ? y : z,"") 
  |  
  |       #define define_sfop4(NN, OP0, OP1)                         \ 
  |       template <typename T>                                      \ 
  |       struct sf##NN##_op : public sf_base<T>                     \ 
  |       {                                                          \ 
  |          typedef typename sf_base<T>::Type const Type;           \ 
  |          static inline T process(Type x, Type y, Type z, Type w) \ 
  |          {                                                       \ 
  |             return (OP0);                                        \ 
  |          }                                                       \ 
  |          static inline std::string id()                          \ 
  |          {                                                       \ 
  |             return (OP1);                                        \ 
  |          }                                                       \ 
  |       };                                                         \ 
  |  
  |       define_sfop4(48,(x + ((y + z) / w)),"t+((t+t)/t)") 
  |       define_sfop4(49,(x + ((y + z) * w)),"t+((t+t)*t)") 
  |       define_sfop4(50,(x + ((y - z) / w)),"t+((t-t)/t)") 
  |       define_sfop4(51,(x + ((y - z) * w)),"t+((t-t)*t)") 
  |       define_sfop4(52,(x + ((y * z) / w)),"t+((t*t)/t)") 
  |       define_sfop4(53,(x + ((y * z) * w)),"t+((t*t)*t)") 
  |       define_sfop4(54,(x + ((y / z) + w)),"t+((t/t)+t)") 
  |       define_sfop4(55,(x + ((y / z) / w)),"t+((t/t)/t)") 
  |       define_sfop4(56,(x + ((y / z) * w)),"t+((t/t)*t)") 
  |       define_sfop4(57,(x - ((y + z) / w)),"t-((t+t)/t)") 
  |       define_sfop4(58,(x - ((y + z) * w)),"t-((t+t)*t)") 
  |       define_sfop4(59,(x - ((y - z) / w)),"t-((t-t)/t)") 
  |       define_sfop4(60,(x - ((y - z) * w)),"t-((t-t)*t)") 
  |       define_sfop4(61,(x - ((y * z) / w)),"t-((t*t)/t)") 
  |       define_sfop4(62,(x - ((y * z) * w)),"t-((t*t)*t)") 
  |       define_sfop4(63,(x - ((y / z) / w)),"t-((t/t)/t)") 
  |       define_sfop4(64,(x - ((y / z) * w)),"t-((t/t)*t)") 
  |       define_sfop4(65,(((x + y) * z) - w),"((t+t)*t)-t") 
  |       define_sfop4(66,(((x - y) * z) - w),"((t-t)*t)-t") 
  |       define_sfop4(67,(((x * y) * z) - w),"((t*t)*t)-t") 
  |       define_sfop4(68,(((x / y) * z) - w),"((t/t)*t)-t") 
  |       define_sfop4(69,(((x + y) / z) - w),"((t+t)/t)-t") 
  |       define_sfop4(70,(((x - y) / z) - w),"((t-t)/t)-t") 
  |       define_sfop4(71,(((x * y) / z) - w),"((t*t)/t)-t") 
  |       define_sfop4(72,(((x / y) / z) - w),"((t/t)/t)-t") 
  |       define_sfop4(73,((x * y) + (z * w)),"(t*t)+(t*t)") 
  |       define_sfop4(74,((x * y) - (z * w)),"(t*t)-(t*t)") 
  |       define_sfop4(75,((x * y) + (z / w)),"(t*t)+(t/t)") 
  |       define_sfop4(76,((x * y) - (z / w)),"(t*t)-(t/t)") 
  |       define_sfop4(77,((x / y) + (z / w)),"(t/t)+(t/t)") 
  |       define_sfop4(78,((x / y) - (z / w)),"(t/t)-(t/t)") 
  |       define_sfop4(79,((x / y) - (z * w)),"(t/t)-(t*t)") 
  |       define_sfop4(80,(x / (y + (z * w))),"t/(t+(t*t))") 
  |       define_sfop4(81,(x / (y - (z * w))),"t/(t-(t*t))") 
  |       define_sfop4(82,(x * (y + (z * w))),"t*(t+(t*t))") 
  |       define_sfop4(83,(x * (y - (z * w))),"t*(t-(t*t))") 
  |  
  |       define_sfop4(84,(axn<T,2>(x,y) + axn<T,2>(z,w)),"") 
  |       define_sfop4(85,(axn<T,3>(x,y) + axn<T,3>(z,w)),"") 
  |       define_sfop4(86,(axn<T,4>(x,y) + axn<T,4>(z,w)),"") 
  |       define_sfop4(87,(axn<T,5>(x,y) + axn<T,5>(z,w)),"") 
  |       define_sfop4(88,(axn<T,6>(x,y) + axn<T,6>(z,w)),"") 
  |       define_sfop4(89,(axn<T,7>(x,y) + axn<T,7>(z,w)),"") 
  |       define_sfop4(90,(axn<T,8>(x,y) + axn<T,8>(z,w)),"") 
  |       define_sfop4(91,(axn<T,9>(x,y) + axn<T,9>(z,w)),"") 
  |       define_sfop4(92,((details::is_true(x) && details::is_true(y)) ? z : w),"") 
  |       define_sfop4(93,((details::is_true(x) || details::is_true(y)) ? z : w),"") 
  |       define_sfop4(94,((x <  y) ? z : w),"") 
  |       define_sfop4(95,((x <= y) ? z : w),"") 
  |       define_sfop4(96,((x >  y) ? z : w),"") 
  |       define_sfop4(97,((x >= y) ? z : w),"") 
  |       define_sfop4(98,(details::is_true(numeric::equal(x,y)) ? z : w),"") 
  |       define_sfop4(99,(x * numeric::sin(y) + z * numeric::cos(w)),"") 
  |  
  |       define_sfop4(ext00,((x + y) - (z * w)),"(t+t)-(t*t)") 
  |       define_sfop4(ext01,((x + y) - (z / w)),"(t+t)-(t/t)") 
  |       define_sfop4(ext02,((x + y) + (z * w)),"(t+t)+(t*t)") 
  |       define_sfop4(ext03,((x + y) + (z / w)),"(t+t)+(t/t)") 
  |       define_sfop4(ext04,((x - y) + (z * w)),"(t-t)+(t*t)") 
  |       define_sfop4(ext05,((x - y) + (z / w)),"(t-t)+(t/t)") 
  |       define_sfop4(ext06,((x - y) - (z * w)),"(t-t)-(t*t)") 
  |       define_sfop4(ext07,((x - y) - (z / w)),"(t-t)-(t/t)") 
  |       define_sfop4(ext08,((x + y) - (z - w)),"(t+t)-(t-t)") 
  |       define_sfop4(ext09,((x + y) + (z - w)),"(t+t)+(t-t)") 
  |       define_sfop4(ext10,((x + y) + (z + w)),"(t+t)+(t+t)") 
  |       define_sfop4(ext11,((x + y) * (z - w)),"(t+t)*(t-t)") 
  |       define_sfop4(ext12,((x + y) / (z - w)),"(t+t)/(t-t)") 
  |       define_sfop4(ext13,((x - y) - (z + w)),"(t-t)-(t+t)") 
  |       define_sfop4(ext14,((x - y) + (z + w)),"(t-t)+(t+t)") 
  |       define_sfop4(ext15,((x - y) * (z + w)),"(t-t)*(t+t)") 
  |       define_sfop4(ext16,((x - y) / (z + w)),"(t-t)/(t+t)") 
  |       define_sfop4(ext17,((x * y) - (z + w)),"(t*t)-(t+t)") 
  |       define_sfop4(ext18,((x / y) - (z + w)),"(t/t)-(t+t)") 
  |       define_sfop4(ext19,((x * y) + (z + w)),"(t*t)+(t+t)") 
  |       define_sfop4(ext20,((x / y) + (z + w)),"(t/t)+(t+t)") 
  |       define_sfop4(ext21,((x * y) + (z - w)),"(t*t)+(t-t)") 
  |       define_sfop4(ext22,((x / y) + (z - w)),"(t/t)+(t-t)") 
  |       define_sfop4(ext23,((x * y) - (z - w)),"(t*t)-(t-t)") 
  |       define_sfop4(ext24,((x / y) - (z - w)),"(t/t)-(t-t)") 
  |       define_sfop4(ext25,((x + y) * (z * w)),"(t+t)*(t*t)") 
  |       define_sfop4(ext26,((x + y) * (z / w)),"(t+t)*(t/t)") 
  |       define_sfop4(ext27,((x + y) / (z * w)),"(t+t)/(t*t)") 
  |       define_sfop4(ext28,((x + y) / (z / w)),"(t+t)/(t/t)") 
  |       define_sfop4(ext29,((x - y) / (z * w)),"(t-t)/(t*t)") 
  |       define_sfop4(ext30,((x - y) / (z / w)),"(t-t)/(t/t)") 
  |       define_sfop4(ext31,((x - y) * (z * w)),"(t-t)*(t*t)") 
  |       define_sfop4(ext32,((x - y) * (z / w)),"(t-t)*(t/t)") 
  |       define_sfop4(ext33,((x * y) * (z + w)),"(t*t)*(t+t)") 
  |       define_sfop4(ext34,((x / y) * (z + w)),"(t/t)*(t+t)") 
  |       define_sfop4(ext35,((x * y) / (z + w)),"(t*t)/(t+t)") 
  |       define_sfop4(ext36,((x / y) / (z + w)),"(t/t)/(t+t)") 
  |       define_sfop4(ext37,((x * y) / (z - w)),"(t*t)/(t-t)") 
  |       define_sfop4(ext38,((x / y) / (z - w)),"(t/t)/(t-t)") 
  |       define_sfop4(ext39,((x * y) * (z - w)),"(t*t)*(t-t)") 
  |       define_sfop4(ext40,((x * y) / (z * w)),"(t*t)/(t*t)") 
  |       define_sfop4(ext41,((x / y) * (z / w)),"(t/t)*(t/t)") 
  |       define_sfop4(ext42,((x / y) * (z - w)),"(t/t)*(t-t)") 
  |       define_sfop4(ext43,((x * y) * (z * w)),"(t*t)*(t*t)") 
  |       define_sfop4(ext44,(x + (y * (z / w))),"t+(t*(t/t))") 
  |       define_sfop4(ext45,(x - (y * (z / w))),"t-(t*(t/t))") 
  |       define_sfop4(ext46,(x + (y / (z * w))),"t+(t/(t*t))") 
  |       define_sfop4(ext47,(x - (y / (z * w))),"t-(t/(t*t))") 
  |       define_sfop4(ext48,(((x - y) - z) * w),"((t-t)-t)*t") 
  |       define_sfop4(ext49,(((x - y) - z) / w),"((t-t)-t)/t") 
  |       define_sfop4(ext50,(((x - y) + z) * w),"((t-t)+t)*t") 
  |       define_sfop4(ext51,(((x - y) + z) / w),"((t-t)+t)/t") 
  |       define_sfop4(ext52,((x + (y - z)) * w),"(t+(t-t))*t") 
  |       define_sfop4(ext53,((x + (y - z)) / w),"(t+(t-t))/t") 
  |       define_sfop4(ext54,((x + y) / (z + w)),"(t+t)/(t+t)") 
  |       define_sfop4(ext55,((x - y) / (z - w)),"(t-t)/(t-t)") 
  |       define_sfop4(ext56,((x + y) * (z + w)),"(t+t)*(t+t)") 
  |       define_sfop4(ext57,((x - y) * (z - w)),"(t-t)*(t-t)") 
  |       define_sfop4(ext58,((x - y) + (z - w)),"(t-t)+(t-t)") 
  |       define_sfop4(ext59,((x - y) - (z - w)),"(t-t)-(t-t)") 
  |       define_sfop4(ext60,((x / y) + (z * w)),"(t/t)+(t*t)") 
  |       define_sfop4(ext61,(((x * y) * z) / w),"((t*t)*t)/t") 
  |  
  |       #undef define_sfop3 
  |       #undef define_sfop4 
  |  
  |       template <typename T, typename SpecialFunction> 
  |       class sf3_node exprtk_final : public trinary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          sf3_node(const operator_type& opr, 
  |                   expression_ptr branch0, 
  |                   expression_ptr branch1, 
  |                   expression_ptr branch2) 
  |          : trinary_node<T>(opr, branch0, branch1, branch2) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             const T x = trinary_node<T>::branch_[0].first->value(); 
  |             const T y = trinary_node<T>::branch_[1].first->value(); 
  |             const T z = trinary_node<T>::branch_[2].first->value(); 
  |  
  |             return SpecialFunction::process(x, y, z); 
  |          } 
  |       }; 
  |  
  |       template <typename T, typename SpecialFunction> 
  |       class sf4_node exprtk_final : public quaternary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          sf4_node(const operator_type& opr, 
  |                   expression_ptr branch0, 
  |                   expression_ptr branch1, 
  |                   expression_ptr branch2, 
  |                   expression_ptr branch3) 
  |          : quaternary_node<T>(opr, branch0, branch1, branch2, branch3) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             const T x = quaternary_node<T>::branch_[0].first->value(); 
  |             const T y = quaternary_node<T>::branch_[1].first->value(); 
  |             const T z = quaternary_node<T>::branch_[2].first->value(); 
  |             const T w = quaternary_node<T>::branch_[3].first->value(); 
  |  
  |             return SpecialFunction::process(x, y, z, w); 
  |          } 
  |       }; 
  |  
  |       template <typename T, typename SpecialFunction> 
  |       class sf3_var_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          sf3_var_node(const T& v0, const T& v1, const T& v2) 
  |          : v0_(v0) 
  |          , v1_(v1) 
  |          , v2_(v2) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return SpecialFunction::process(v0_, v1_, v2_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_trinary; 
  |          } 
  |  
  |       private: 
  |  
  |          sf3_var_node(const sf3_var_node<T,SpecialFunction>&) exprtk_delete; 
  |          sf3_var_node<T,SpecialFunction>& operator=(const sf3_var_node<T,SpecialFunction>&) exprtk_delete; 
  |  
  |          const T& v0_; 
  |          const T& v1_; 
  |          const T& v2_; 
  |       }; 
  |  
  |       template <typename T, typename SpecialFunction> 
  |       class sf4_var_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          sf4_var_node(const T& v0, const T& v1, const T& v2, const T& v3) 
  |          : v0_(v0) 
  |          , v1_(v1) 
  |          , v2_(v2) 
  |          , v3_(v3) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return SpecialFunction::process(v0_, v1_, v2_, v3_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_trinary; 
  |          } 
  |  
  |       private: 
  |  
  |          sf4_var_node(const sf4_var_node<T,SpecialFunction>&) exprtk_delete; 
  |          sf4_var_node<T,SpecialFunction>& operator=(const sf4_var_node<T,SpecialFunction>&) exprtk_delete; 
  |  
  |          const T& v0_; 
  |          const T& v1_; 
  |          const T& v2_; 
  |          const T& v3_; 
  |       }; 
  |  
  |       template <typename T, typename VarArgFunction> 
  |       class vararg_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          explicit vararg_node(const Sequence<expression_ptr,Allocator>& arg_list) 
  |          : initialised_(false) 
  |          { 
  |             arg_list_.resize(arg_list.size()); 
  |  
  |             for (std::size_t i = 0; i < arg_list.size(); ++i) 
  |             { 
  |                if (arg_list[i] && arg_list[i]->valid()) 
  |                { 
  |                   construct_branch_pair(arg_list_[i],arg_list[i]); 
  |                } 
  |                else 
  |                { 
  |                   arg_list_.clear(); 
  |                   return; 
  |                } 
  |             } 
  |  
  |             initialised_ = (arg_list_.size() == arg_list.size()); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return VarArgFunction::process(arg_list_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vararg; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return initialised_; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(arg_list_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(arg_list_); 
  |          } 
  |  
  |          std::size_t size() const 
  |          { 
  |             return arg_list_.size(); 
  |          } 
  |  
  |          expression_ptr operator[](const std::size_t& index) const 
  |          { 
  |             return arg_list_[index].first; 
  |          } 
  |  
  |       private: 
  |  
  |          std::vector<branch_t> arg_list_; 
  |          bool initialised_; 
  |       }; 
  |  
  |       template <typename T, typename VarArgFunction> 
  |       class vararg_varnode exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          explicit vararg_varnode(const Sequence<expression_ptr,Allocator>& arg_list) 
  |          : initialised_(false) 
  |          { 
  |             arg_list_.resize(arg_list.size()); 
  |  
  |             for (std::size_t i = 0; i < arg_list.size(); ++i) 
  |             { 
  |                if (arg_list[i] && arg_list[i]->valid() && is_variable_node(arg_list[i])) 
  |                { 
  |                   variable_node<T>* var_node_ptr = static_cast<variable_node<T>*>(arg_list[i]); 
  |                   arg_list_[i] = (&var_node_ptr->ref()); 
  |                } 
  |                else 
  |                { 
  |                   arg_list_.clear(); 
  |                   return; 
  |                } 
  |             } 
  |  
  |             initialised_ = (arg_list.size() == arg_list_.size()); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return VarArgFunction::process(arg_list_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vararg; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return initialised_; 
  |          } 
  |  
  |       private: 
  |  
  |          std::vector<const T*> arg_list_; 
  |          bool initialised_; 
  |       }; 
  |  
  |       template <typename T, typename VecFunction> 
  |       class vectorize_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          explicit vectorize_node(const expression_ptr v) 
  |          : ivec_ptr_(0) 
  |          { 
  |             construct_branch_pair(v_, v); 
  |  
  |             if (is_ivector_node(v_.first)) 
  |             { 
  |                ivec_ptr_ = dynamic_cast<vector_interface<T>*>(v_.first); 
  |             } 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             v_.first->value(); 
  |             return VecFunction::process(ivec_ptr_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecfunc; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return ivec_ptr_ && v_.first && v_.first->valid(); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(v_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(v_); 
  |          } 
  |  
  |       private: 
  |  
  |          vector_interface<T>* ivec_ptr_; 
  |          branch_t                    v_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class assignment_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          using binary_node<T>::branch; 
  |  
  |          assignment_node(const operator_type& opr, 
  |                          expression_ptr branch0, 
  |                          expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , var_node_ptr_(0) 
  |          { 
  |             if (is_variable_node(branch(0))) 
  |             { 
  |                var_node_ptr_ = static_cast<variable_node<T>*>(branch(0)); 
  |             } 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T& result = var_node_ptr_->ref(); 
  |                result = branch(1)->value(); 
  |  
  |             return result; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return var_node_ptr_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          variable_node<T>* var_node_ptr_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class assignment_vec_elem_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          using binary_node<T>::branch; 
  |  
  |          assignment_vec_elem_node(const operator_type& opr, 
  |                                   expression_ptr branch0, 
  |                                   expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , vec_node_ptr_(0) 
  |          { 
  |             if (is_vector_elem_node(branch(0))) 
  |             { 
  |                vec_node_ptr_ = static_cast<vector_elem_node<T>*>(branch(0)); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T& result = vec_node_ptr_->ref(); 
  |                result = branch(1)->value(); 
  |  
  |             return result; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return vec_node_ptr_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          vector_elem_node<T>* vec_node_ptr_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class assignment_vec_elem_rtc_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          using binary_node<T>::branch; 
  |  
  |          assignment_vec_elem_rtc_node(const operator_type& opr, 
  |                                       expression_ptr branch0, 
  |                                       expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , vec_node_ptr_(0) 
  |          { 
  |             if (is_vector_elem_rtc_node(branch(0))) 
  |             { 
  |                vec_node_ptr_ = static_cast<vector_elem_rtc_node<T>*>(branch(0)); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T& result = vec_node_ptr_->ref(); 
  |                result = branch(1)->value(); 
  |  
  |             return result; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return vec_node_ptr_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          vector_elem_rtc_node<T>* vec_node_ptr_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class assignment_rebasevec_elem_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          using expression_node<T>::branch; 
  |  
  |          assignment_rebasevec_elem_node(const operator_type& opr, 
  |                                         expression_ptr branch0, 
  |                                         expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , rbvec_node_ptr_(0) 
  |          { 
  |             if (is_rebasevector_elem_node(branch(0))) 
  |             { 
  |                rbvec_node_ptr_ = static_cast<rebasevector_elem_node<T>*>(branch(0)); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T& result = rbvec_node_ptr_->ref(); 
  |                result = branch(1)->value(); 
  |  
  |             return result; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return rbvec_node_ptr_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          rebasevector_elem_node<T>* rbvec_node_ptr_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class assignment_rebasevec_elem_rtc_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          using expression_node<T>::branch; 
  |  
  |          assignment_rebasevec_elem_rtc_node(const operator_type& opr, 
  |                                             expression_ptr branch0, 
  |                                             expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , rbvec_node_ptr_(0) 
  |          { 
  |             if (is_rebasevector_elem_rtc_node(branch(0))) 
  |             { 
  |                rbvec_node_ptr_ = static_cast<rebasevector_elem_rtc_node<T>*>(branch(0)); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T& result = rbvec_node_ptr_->ref(); 
  |                result = branch(1)->value(); 
  |  
  |             return result; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return rbvec_node_ptr_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          rebasevector_elem_rtc_node<T>* rbvec_node_ptr_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class assignment_rebasevec_celem_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          using binary_node<T>::branch; 
  |  
  |          assignment_rebasevec_celem_node(const operator_type& opr, 
  |                                          expression_ptr branch0, 
  |                                          expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , rbvec_node_ptr_(0) 
  |          { 
  |             if (is_rebasevector_celem_node(branch(0))) 
  |             { 
  |                rbvec_node_ptr_ = static_cast<rebasevector_celem_node<T>*>(branch(0)); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T& result = rbvec_node_ptr_->ref(); 
  |                result = branch(1)->value(); 
  |  
  |             return result; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return rbvec_node_ptr_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          rebasevector_celem_node<T>* rbvec_node_ptr_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class assignment_vec_node exprtk_final 
  |                                 : public binary_node     <T> 
  |                                 , public vector_interface<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef vector_node<T>*     vector_node_ptr; 
  |          typedef vec_data_store<T>   vds_t; 
  |  
  |          using binary_node<T>::branch; 
  |  
  |          assignment_vec_node(const operator_type& opr, 
  |                              expression_ptr branch0, 
  |                              expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , vec_node_ptr_(0) 
  |          { 
  |             if (is_vector_node(branch(0))) 
  |             { 
  |                vec_node_ptr_ = static_cast<vector_node<T>*>(branch(0)); 
  |                vds()         = vec_node_ptr_->vds(); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             const T v = branch(1)->value(); 
  |  
  |             T* vec = vds().data(); 
  |  
  |             loop_unroll::details lud(size()); 
  |             const T* upper_bound = vec + lud.upper_bound; 
  |  
  |             while (vec < upper_bound) 
  |             { 
  |                #define exprtk_loop(N) \ 
  |                vec[N] = v;            \ 
  |  
  |                exprtk_loop( 0) exprtk_loop( 1) 
  |                exprtk_loop( 2) exprtk_loop( 3) 
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                exprtk_loop( 4) exprtk_loop( 5) 
  |                exprtk_loop( 6) exprtk_loop( 7) 
  |                exprtk_loop( 8) exprtk_loop( 9) 
  |                exprtk_loop(10) exprtk_loop(11) 
  |                exprtk_loop(12) exprtk_loop(13) 
  |                exprtk_loop(14) exprtk_loop(15) 
  |                #endif 
  |  
  |                vec += lud.batch_size; 
  |             } 
  |  
  |             switch (lud.remainder) 
  |             { 
  |                #define case_stmt(N) \ 
  |                case N : *vec++ = v; \ 
  |                exprtk_fallthrough   \ 
  |  
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                case_stmt(15) case_stmt(14) 
  |                case_stmt(13) case_stmt(12) 
  |                case_stmt(11) case_stmt(10) 
  |                case_stmt( 9) case_stmt( 8) 
  |                case_stmt( 7) case_stmt( 6) 
  |                case_stmt( 5) case_stmt( 4) 
  |                #endif 
  |                case_stmt( 3) case_stmt( 2) 
  |                case 1 : *vec++ = v; 
  |             } 
  |  
  |             #undef exprtk_loop 
  |             #undef case_stmt 
  |  
  |             return vec_node_ptr_->value(); 
  |          } 
  |  
  |          vector_node_ptr vec() const exprtk_override 
  |          { 
  |             return vec_node_ptr_; 
  |          } 
  |  
  |          vector_node_ptr vec() exprtk_override 
  |          { 
  |             return vec_node_ptr_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecvalass; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                vec_node_ptr_ && 
  |                (vds().size() <= vec_node_ptr_->vec_holder().base_size()) && 
  |                binary_node<T>::valid(); 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return vec_node_ptr_->vec_holder().size(); 
  |          } 
  |  
  |          std::size_t base_size() const exprtk_override 
  |          { 
  |             return vec_node_ptr_->vec_holder().base_size(); 
  |          } 
  |  
  |          vds_t& vds() exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |          const vds_t& vds() const exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |       private: 
  |  
  |          vector_node<T>* vec_node_ptr_; 
  |          vds_t           vds_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class assignment_vecvec_node exprtk_final 
  |                                    : public binary_node     <T> 
  |                                    , public vector_interface<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef vector_node<T>*     vector_node_ptr; 
  |          typedef vec_data_store<T>   vds_t; 
  |  
  |          using binary_node<T>::branch; 
  |  
  |          assignment_vecvec_node(const operator_type& opr, 
  |                                 expression_ptr branch0, 
  |                                 expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , vec0_node_ptr_(0) 
  |          , vec1_node_ptr_(0) 
  |          , initialised_(false) 
  |          , src_is_ivec_(false) 
  |          { 
  |             if (is_vector_node(branch(0))) 
  |             { 
  |                vec0_node_ptr_ = static_cast<vector_node<T>*>(branch(0)); 
  |                vds()          = vec0_node_ptr_->vds(); 
  |             } 
  |  
  |             if (is_vector_node(branch(1))) 
  |             { 
  |                vec1_node_ptr_ = static_cast<vector_node<T>*>(branch(1)); 
  |                vds_t::match_sizes(vds(),vec1_node_ptr_->vds()); 
  |             } 
  |             else if (is_ivector_node(branch(1))) 
  |             { 
  |                vector_interface<T>* vi = reinterpret_cast<vector_interface<T>*>(0); 
  |  
  |                if (0 != (vi = dynamic_cast<vector_interface<T>*>(branch(1)))) 
  |                { 
  |                   vec1_node_ptr_ = vi->vec(); 
  |  
  |                   if (!vi->side_effect()) 
  |                   { 
  |                      vi->vds()    = vds(); 
  |                      src_is_ivec_ = true; 
  |                   } 
  |                   else 
  |                      vds_t::match_sizes(vds(),vi->vds()); 
  |                } 
  |             } 
  |  
  |             initialised_ = 
  |                vec0_node_ptr_               && 
  |                vec1_node_ptr_               && 
  |                (size() <= base_size())      && 
  |                (vds_.size() <= base_size()) && 
  |                binary_node<T>::valid(); 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             branch(1)->value(); 
  |  
  |             if (src_is_ivec_) 
  |                return vec0_node_ptr_->value(); 
  |  
  |             T* vec0 = vec0_node_ptr_->vds().data(); 
  |             T* vec1 = vec1_node_ptr_->vds().data(); 
  |  
  |             loop_unroll::details lud(size()); 
  |             const T* upper_bound = vec0 + lud.upper_bound; 
  |  
  |             while (vec0 < upper_bound) 
  |             { 
  |                #define exprtk_loop(N) \ 
  |                vec0[N] = vec1[N];     \ 
  |  
  |                exprtk_loop( 0) exprtk_loop( 1) 
  |                exprtk_loop( 2) exprtk_loop( 3) 
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                exprtk_loop( 4) exprtk_loop( 5) 
  |                exprtk_loop( 6) exprtk_loop( 7) 
  |                exprtk_loop( 8) exprtk_loop( 9) 
  |                exprtk_loop(10) exprtk_loop(11) 
  |                exprtk_loop(12) exprtk_loop(13) 
  |                exprtk_loop(14) exprtk_loop(15) 
  |                #endif 
  |  
  |                vec0 += lud.batch_size; 
  |                vec1 += lud.batch_size; 
  |             } 
  |  
  |             switch (lud.remainder) 
  |             { 
  |                #define case_stmt(N,fall_through) \ 
  |                case N : *vec0++ = *vec1++;       \ 
  |                fall_through                      \ 
  |  
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                case_stmt(15, exprtk_fallthrough) case_stmt(14, exprtk_fallthrough) 
  |                case_stmt(13, exprtk_fallthrough) case_stmt(12, exprtk_fallthrough) 
  |                case_stmt(11, exprtk_fallthrough) case_stmt(10, exprtk_fallthrough) 
  |                case_stmt( 9, exprtk_fallthrough) case_stmt( 8, exprtk_fallthrough) 
  |                case_stmt( 7, exprtk_fallthrough) case_stmt( 6, exprtk_fallthrough) 
  |                case_stmt( 5, exprtk_fallthrough) case_stmt( 4, exprtk_fallthrough) 
  |                #endif 
  |                case_stmt( 3, exprtk_fallthrough) case_stmt( 2, exprtk_fallthrough) 
  |                case_stmt( 1, (void)0;) 
  |             } 
  |  
  |             #undef exprtk_loop 
  |             #undef case_stmt 
  |  
  |             return vec0_node_ptr_->value(); 
  |          } 
  |  
  |          vector_node_ptr vec() exprtk_override 
  |          { 
  |             return vec0_node_ptr_; 
  |          } 
  |  
  |          vector_node_ptr vec() const exprtk_override 
  |          { 
  |             return vec0_node_ptr_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecvecass; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return initialised_; 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return std::min( 
  |                vec0_node_ptr_->vec_holder().size(), 
  |                vec1_node_ptr_->vec_holder().size()); 
  |          } 
  |  
  |          std::size_t base_size() const exprtk_override 
  |          { 
  |             return std::min( 
  |                vec0_node_ptr_->vec_holder().base_size(), 
  |                vec1_node_ptr_->vec_holder().base_size()); 
  |          } 
  |  
  |          vds_t& vds() exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |          const vds_t& vds() const exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |       private: 
  |  
  |          vector_node<T>* vec0_node_ptr_; 
  |          vector_node<T>* vec1_node_ptr_; 
  |          bool            initialised_; 
  |          bool            src_is_ivec_; 
  |          vds_t           vds_; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class assignment_op_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          using binary_node<T>::branch; 
  |  
  |          assignment_op_node(const operator_type& opr, 
  |                             expression_ptr branch0, 
  |                             expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , var_node_ptr_(0) 
  |          { 
  |             if (is_variable_node(branch(0))) 
  |             { 
  |                var_node_ptr_ = static_cast<variable_node<T>*>(branch(0)); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T& v = var_node_ptr_->ref(); 
  |             v = Operation::process(v,branch(1)->value()); 
  |  
  |             return v; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return var_node_ptr_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          variable_node<T>* var_node_ptr_; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class assignment_vec_elem_op_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          using binary_node<T>::branch; 
  |  
  |          assignment_vec_elem_op_node(const operator_type& opr, 
  |                                      expression_ptr branch0, 
  |                                      expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , vec_node_ptr_(0) 
  |          { 
  |             if (is_vector_elem_node(branch(0))) 
  |             { 
  |                vec_node_ptr_ = static_cast<vector_elem_node<T>*>(branch(0)); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T& v = vec_node_ptr_->ref(); 
  |                v = Operation::process(v,branch(1)->value()); 
  |  
  |             return v; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return vec_node_ptr_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          vector_elem_node<T>* vec_node_ptr_; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class assignment_vec_elem_op_rtc_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          using binary_node<T>::branch; 
  |  
  |          assignment_vec_elem_op_rtc_node(const operator_type& opr, 
  |                                          expression_ptr branch0, 
  |                                          expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , vec_node_ptr_(0) 
  |          { 
  |             if (is_vector_elem_rtc_node(branch(0))) 
  |             { 
  |                vec_node_ptr_ = static_cast<vector_elem_rtc_node<T>*>(branch(0)); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T& v = vec_node_ptr_->ref(); 
  |                v = Operation::process(v,branch(1)->value()); 
  |  
  |             return v; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return vec_node_ptr_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          vector_elem_rtc_node<T>* vec_node_ptr_; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class assignment_vec_celem_op_rtc_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          using binary_node<T>::branch; 
  |  
  |          assignment_vec_celem_op_rtc_node(const operator_type& opr, 
  |                                           expression_ptr branch0, 
  |                                           expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , vec_node_ptr_(0) 
  |          { 
  |             if (is_vector_celem_rtc_node(branch(0))) 
  |             { 
  |                vec_node_ptr_ = static_cast<vector_celem_rtc_node<T>*>(branch(0)); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T& v = vec_node_ptr_->ref(); 
  |                v = Operation::process(v,branch(1)->value()); 
  |  
  |             return v; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return vec_node_ptr_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          vector_celem_rtc_node<T>* vec_node_ptr_; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class assignment_rebasevec_elem_op_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          using binary_node<T>::branch; 
  |  
  |          assignment_rebasevec_elem_op_node(const operator_type& opr, 
  |                                            expression_ptr branch0, 
  |                                            expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , rbvec_node_ptr_(0) 
  |          { 
  |             if (is_rebasevector_elem_node(branch(0))) 
  |             { 
  |                rbvec_node_ptr_ = static_cast<rebasevector_elem_node<T>*>(branch(0)); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T& v = rbvec_node_ptr_->ref(); 
  |                v = Operation::process(v,branch(1)->value()); 
  |  
  |             return v; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return rbvec_node_ptr_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          rebasevector_elem_node<T>* rbvec_node_ptr_; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class assignment_rebasevec_celem_op_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          using binary_node<T>::branch; 
  |  
  |          assignment_rebasevec_celem_op_node(const operator_type& opr, 
  |                                             expression_ptr branch0, 
  |                                             expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , rbvec_node_ptr_(0) 
  |          { 
  |             if (is_rebasevector_celem_node(branch(0))) 
  |             { 
  |                rbvec_node_ptr_ = static_cast<rebasevector_celem_node<T>*>(branch(0)); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T& v = rbvec_node_ptr_->ref(); 
  |                v = Operation::process(v,branch(1)->value()); 
  |  
  |             return v; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return rbvec_node_ptr_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          rebasevector_celem_node<T>* rbvec_node_ptr_; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class assignment_rebasevec_elem_op_rtc_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          using binary_node<T>::branch; 
  |  
  |          assignment_rebasevec_elem_op_rtc_node(const operator_type& opr, 
  |                                                expression_ptr branch0, 
  |                                                expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , rbvec_node_ptr_(0) 
  |          { 
  |             if (is_rebasevector_elem_rtc_node(branch(0))) 
  |             { 
  |                rbvec_node_ptr_ = static_cast<rebasevector_elem_rtc_node<T>*>(branch(0)); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T& v = rbvec_node_ptr_->ref(); 
  |                v = Operation::process(v,branch(1)->value()); 
  |  
  |             return v; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return rbvec_node_ptr_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          rebasevector_elem_rtc_node<T>* rbvec_node_ptr_; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class assignment_rebasevec_celem_op_rtc_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          using binary_node<T>::branch; 
  |  
  |          assignment_rebasevec_celem_op_rtc_node(const operator_type& opr, 
  |                                                 expression_ptr branch0, 
  |                                                 expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , rbvec_node_ptr_(0) 
  |          { 
  |             if (is_rebasevector_celem_rtc_node(branch(0))) 
  |             { 
  |                rbvec_node_ptr_ = static_cast<rebasevector_celem_rtc_node<T>*>(branch(0)); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T& v = rbvec_node_ptr_->ref(); 
  |                v = Operation::process(v,branch(1)->value()); 
  |  
  |             return v; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return rbvec_node_ptr_ && binary_node<T>::valid(); 
  |          } 
  |  
  |       private: 
  |  
  |          rebasevector_celem_rtc_node<T>* rbvec_node_ptr_; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class assignment_vec_op_node exprtk_final 
  |                                    : public binary_node     <T> 
  |                                    , public vector_interface<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef vector_node<T>*     vector_node_ptr; 
  |          typedef vec_data_store<T>   vds_t; 
  |  
  |          using binary_node<T>::branch; 
  |  
  |          assignment_vec_op_node(const operator_type& opr, 
  |                                 expression_ptr branch0, 
  |                                 expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , vec_node_ptr_(0) 
  |          { 
  |             if (is_vector_node(branch(0))) 
  |             { 
  |                vec_node_ptr_ = static_cast<vector_node<T>*>(branch(0)); 
  |                vds()         = vec_node_ptr_->vds(); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             const T v = branch(1)->value(); 
  |  
  |             T* vec = vds().data(); 
  |  
  |             loop_unroll::details lud(size()); 
  |             const T* upper_bound = vec + lud.upper_bound; 
  |  
  |             while (vec < upper_bound) 
  |             { 
  |                #define exprtk_loop(N)       \ 
  |                Operation::assign(vec[N],v); \ 
  |  
  |                exprtk_loop( 0) exprtk_loop( 1) 
  |                exprtk_loop( 2) exprtk_loop( 3) 
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                exprtk_loop( 4) exprtk_loop( 5) 
  |                exprtk_loop( 6) exprtk_loop( 7) 
  |                exprtk_loop( 8) exprtk_loop( 9) 
  |                exprtk_loop(10) exprtk_loop(11) 
  |                exprtk_loop(12) exprtk_loop(13) 
  |                exprtk_loop(14) exprtk_loop(15) 
  |                #endif 
  |  
  |                vec += lud.batch_size; 
  |             } 
  |  
  |             switch (lud.remainder) 
  |             { 
  |                #define case_stmt(N,fall_through)     \ 
  |                case N : Operation::assign(*vec++,v); \ 
  |                fall_through                          \ 
  |  
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                case_stmt(15, exprtk_fallthrough) case_stmt(14, exprtk_fallthrough) 
  |                case_stmt(13, exprtk_fallthrough) case_stmt(12, exprtk_fallthrough) 
  |                case_stmt(11, exprtk_fallthrough) case_stmt(10, exprtk_fallthrough) 
  |                case_stmt( 9, exprtk_fallthrough) case_stmt( 8, exprtk_fallthrough) 
  |                case_stmt( 7, exprtk_fallthrough) case_stmt( 6, exprtk_fallthrough) 
  |                case_stmt( 5, exprtk_fallthrough) case_stmt( 4, exprtk_fallthrough) 
  |                #endif 
  |                case_stmt( 3, exprtk_fallthrough) case_stmt( 2, exprtk_fallthrough) 
  |                case_stmt( 1, (void)0;) 
  |             } 
  |  
  |             #undef exprtk_loop 
  |             #undef case_stmt 
  |  
  |             return vec_node_ptr_->value(); 
  |          } 
  |  
  |          vector_node_ptr vec() const exprtk_override 
  |          { 
  |             return vec_node_ptr_; 
  |          } 
  |  
  |          vector_node_ptr vec() exprtk_override 
  |          { 
  |             return vec_node_ptr_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecopvalass; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                vec_node_ptr_           && 
  |                (size() <= base_size()) && 
  |                binary_node<T>::valid() ; 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return vec_node_ptr_->vec_holder().size(); 
  |          } 
  |  
  |          std::size_t base_size() const exprtk_override 
  |          { 
  |             return vec_node_ptr_->vec_holder().base_size(); 
  |          } 
  |  
  |          vds_t& vds() exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |          const vds_t& vds() const exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |          bool side_effect() const exprtk_override 
  |          { 
  |             return true; 
  |          } 
  |  
  |       private: 
  |  
  |          vector_node<T>* vec_node_ptr_; 
  |          vds_t           vds_; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class assignment_vecvec_op_node exprtk_final 
  |                                       : public binary_node     <T> 
  |                                       , public vector_interface<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef vector_node<T>*     vector_node_ptr; 
  |          typedef vec_data_store<T>   vds_t; 
  |  
  |          using binary_node<T>::branch; 
  |  
  |          assignment_vecvec_op_node(const operator_type& opr, 
  |                                    expression_ptr branch0, 
  |                                    expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , vec0_node_ptr_(0) 
  |          , vec1_node_ptr_(0) 
  |          , initialised_(false) 
  |          { 
  |             if (is_vector_node(branch(0))) 
  |             { 
  |                vec0_node_ptr_ = static_cast<vector_node<T>*>(branch(0)); 
  |                vds()          = vec0_node_ptr_->vds(); 
  |             } 
  |  
  |             if (is_vector_node(branch(1))) 
  |             { 
  |                vec1_node_ptr_ = static_cast<vector_node<T>*>(branch(1)); 
  |                vec1_node_ptr_->vds() = vds(); 
  |             } 
  |             else if (is_ivector_node(branch(1))) 
  |             { 
  |                vector_interface<T>* vi = reinterpret_cast<vector_interface<T>*>(0); 
  |  
  |                if (0 != (vi = dynamic_cast<vector_interface<T>*>(branch(1)))) 
  |                { 
  |                   vec1_node_ptr_ = vi->vec(); 
  |                   vec1_node_ptr_->vds() = vi->vds(); 
  |                } 
  |                else 
  |                   vds_t::match_sizes(vds(),vec1_node_ptr_->vds()); 
  |             } 
  |  
  |             initialised_ = 
  |                vec0_node_ptr_          && 
  |                vec1_node_ptr_          && 
  |                (size() <= base_size()) && 
  |                binary_node<T>::valid(); 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             branch(0)->value(); 
  |             branch(1)->value(); 
  |  
  |                   T* vec0 = vec0_node_ptr_->vds().data(); 
  |             const T* vec1 = vec1_node_ptr_->vds().data(); 
  |  
  |             loop_unroll::details lud(size()); 
  |             const T* upper_bound = vec0 + lud.upper_bound; 
  |  
  |             while (vec0 < upper_bound) 
  |             { 
  |                #define exprtk_loop(N)                          \ 
  |                vec0[N] = Operation::process(vec0[N], vec1[N]); \ 
  |  
  |                exprtk_loop( 0) exprtk_loop( 1) 
  |                exprtk_loop( 2) exprtk_loop( 3) 
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                exprtk_loop( 4) exprtk_loop( 5) 
  |                exprtk_loop( 6) exprtk_loop( 7) 
  |                exprtk_loop( 8) exprtk_loop( 9) 
  |                exprtk_loop(10) exprtk_loop(11) 
  |                exprtk_loop(12) exprtk_loop(13) 
  |                exprtk_loop(14) exprtk_loop(15) 
  |                #endif 
  |  
  |                vec0 += lud.batch_size; 
  |                vec1 += lud.batch_size; 
  |             } 
  |  
  |             int i = 0; 
  |  
  |             switch (lud.remainder) 
  |             { 
  |                #define case_stmt(N,fall_through)                                 \ 
  |                case N : { vec0[i] = Operation::process(vec0[i], vec1[i]); ++i; } \ 
  |                fall_through                                                      \ 
  |  
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                case_stmt(15, exprtk_fallthrough) case_stmt(14, exprtk_fallthrough) 
  |                case_stmt(13, exprtk_fallthrough) case_stmt(12, exprtk_fallthrough) 
  |                case_stmt(11, exprtk_fallthrough) case_stmt(10, exprtk_fallthrough) 
  |                case_stmt( 9, exprtk_fallthrough) case_stmt( 8, exprtk_fallthrough) 
  |                case_stmt( 7, exprtk_fallthrough) case_stmt( 6, exprtk_fallthrough) 
  |                case_stmt( 5, exprtk_fallthrough) case_stmt( 4, exprtk_fallthrough) 
  |                #endif 
  |                case_stmt( 3, exprtk_fallthrough) case_stmt( 2, exprtk_fallthrough) 
  |                case_stmt( 1, (void)0;) 
  |             } 
  |  
  |             #undef exprtk_loop 
  |             #undef case_stmt 
  |  
  |             return vec0_node_ptr_->value(); 
  |          } 
  |  
  |          vector_node_ptr vec() const exprtk_override 
  |          { 
  |             return vec0_node_ptr_; 
  |          } 
  |  
  |          vector_node_ptr vec() exprtk_override 
  |          { 
  |             return vec0_node_ptr_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecopvecass; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return initialised_; 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return std::min( 
  |                vec0_node_ptr_->vec_holder().size(), 
  |                vec1_node_ptr_->vec_holder().size()); 
  |          } 
  |  
  |          std::size_t base_size() const exprtk_override 
  |          { 
  |             return std::min( 
  |                vec0_node_ptr_->vec_holder().base_size(), 
  |                vec1_node_ptr_->vec_holder().base_size()); 
  |          } 
  |  
  |          vds_t& vds() exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |          const vds_t& vds() const exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |          bool side_effect() const exprtk_override 
  |          { 
  |             return true; 
  |          } 
  |  
  |       private: 
  |  
  |          vector_node<T>* vec0_node_ptr_; 
  |          vector_node<T>* vec1_node_ptr_; 
  |          bool            initialised_; 
  |          vds_t           vds_; 
  |       }; 
  |  
  |       template <typename T> 
  |       struct memory_context_t 
  |       { 
  |          typedef vector_node<T>*  vector_node_ptr; 
  |          typedef vector_holder<T> vector_holder_t; 
  |          typedef vector_holder_t* vector_holder_ptr; 
  |  
  |          memory_context_t() 
  |          : temp_(0) 
  |          , temp_vec_node_(0) 
  |          {} 
  |  
  |          void clear() 
  |          { 
  |             delete temp_vec_node_; 
  |             delete temp_; 
  |          } 
  |  
  |          vector_holder_ptr temp_; 
  |          vector_node_ptr   temp_vec_node_; 
  |       }; 
  |  
  |       template <typename T> 
  |       inline memory_context_t<T> make_memory_context(vector_holder<T>& vec_holder, 
  |                                                      vec_data_store<T>& vds) 
  |       { 
  |          memory_context_t<T> result_ctxt; 
  |          result_ctxt.temp_  = (vec_holder.rebaseable()) ? 
  |                               new vector_holder<T>(vec_holder,vds) : 
  |                               new vector_holder<T>(vds) ; 
  |          result_ctxt.temp_vec_node_ = new vector_node  <T>(vds,result_ctxt.temp_); 
  |          return result_ctxt; 
  |       } 
  |  
  |       template <typename T> 
  |       inline memory_context_t<T> make_memory_context(vector_holder<T>& vec_holder0, 
  |                                                      vector_holder<T>& vec_holder1, 
  |                                                      vec_data_store<T>& vds) 
  |       { 
  |          memory_context_t<T> result_ctxt; 
  |  
  |          if (!vec_holder0.rebaseable() && !vec_holder1.rebaseable()) 
  |             result_ctxt.temp_ = new vector_holder<T>(vds); 
  |          else if (vec_holder0.rebaseable() && !vec_holder1.rebaseable()) 
  |             result_ctxt.temp_ = new vector_holder<T>(vec_holder0,vds); 
  |          else if (!vec_holder0.rebaseable() && vec_holder1.rebaseable()) 
  |             result_ctxt.temp_ = new vector_holder<T>(vec_holder1,vds); 
  |          else 
  |          { 
  |             result_ctxt.temp_ = (vec_holder0.base_size() >= vec_holder1.base_size()) ? 
  |                                 new vector_holder<T>(vec_holder0, vds) : 
  |                                 new vector_holder<T>(vec_holder1, vds) ; 
  |          } 
  |  
  |          result_ctxt.temp_vec_node_ = new vector_node <T>(vds,result_ctxt.temp_); 
  |          return result_ctxt; 
  |       } 
  |  
  |       template <typename T, typename Operation> 
  |       class vec_binop_vecvec_node exprtk_final 
  |                                   : public binary_node     <T> 
  |                                   , public vector_interface<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef vector_node<T>*     vector_node_ptr; 
  |          typedef vector_holder<T>    vector_holder_t; 
  |          typedef vector_holder_t*    vector_holder_ptr; 
  |          typedef vec_data_store<T>   vds_t; 
  |          typedef memory_context_t<T> memory_context; 
  |  
  |          using binary_node<T>::branch; 
  |  
  |          vec_binop_vecvec_node(const operator_type& opr, 
  |                                expression_ptr branch0, 
  |                                expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , vec0_node_ptr_(0) 
  |          , vec1_node_ptr_(0) 
  |          , initialised_(false) 
  |          { 
  |             bool v0_is_ivec = false; 
  |             bool v1_is_ivec = false; 
  |  
  |             if (is_vector_node(branch(0))) 
  |             { 
  |                vec0_node_ptr_ = static_cast<vector_node_ptr>(branch(0)); 
  |             } 
  |             else if (is_ivector_node(branch(0))) 
  |             { 
  |                vector_interface<T>* vi = reinterpret_cast<vector_interface<T>*>(0); 
  |  
  |                if (0 != (vi = dynamic_cast<vector_interface<T>*>(branch(0)))) 
  |                { 
  |                   vec0_node_ptr_ = vi->vec(); 
  |                   v0_is_ivec     = true; 
  |                } 
  |             } 
  |  
  |             if (is_vector_node(branch(1))) 
  |             { 
  |                vec1_node_ptr_ = static_cast<vector_node_ptr>(branch(1)); 
  |             } 
  |             else if (is_ivector_node(branch(1))) 
  |             { 
  |                vector_interface<T>* vi = reinterpret_cast<vector_interface<T>*>(0); 
  |  
  |                if (0 != (vi = dynamic_cast<vector_interface<T>*>(branch(1)))) 
  |                { 
  |                   vec1_node_ptr_ = vi->vec(); 
  |                   v1_is_ivec     = true; 
  |                } 
  |             } 
  |  
  |             if (vec0_node_ptr_ && vec1_node_ptr_) 
  |             { 
  |                vector_holder<T>& vec0 = vec0_node_ptr_->vec_holder(); 
  |                vector_holder<T>& vec1 = vec1_node_ptr_->vec_holder(); 
  |  
  |                if (v0_is_ivec && (vec0.base_size() <= vec1.base_size())) 
  |                { 
  |                   vds_ = vds_t(vec0_node_ptr_->vds()); 
  |                } 
  |                else if (v1_is_ivec && (vec1.base_size() <= vec0.base_size())) 
  |                { 
  |                   vds_ = vds_t(vec1_node_ptr_->vds()); 
  |                } 
  |                else 
  |                { 
  |                   vds_ = vds_t(std::min(vec0.base_size(),vec1.base_size())); 
  |                } 
  |  
  |                memory_context_ = make_memory_context(vec0, vec1, vds()); 
  |  
  |                initialised_ = 
  |                   (size() <= base_size()) && 
  |                   binary_node<T>::valid(); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |         ~vec_binop_vecvec_node() 
  |          { 
  |             memory_context_.clear(); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             branch(0)->value(); 
  |             branch(1)->value(); 
  |  
  |             const T* vec0 = vec0_node_ptr_->vds().data(); 
  |             const T* vec1 = vec1_node_ptr_->vds().data(); 
  |                   T* vec2 = vds().data(); 
  |  
  |             loop_unroll::details lud(size()); 
  |             const T* upper_bound = vec2 + lud.upper_bound; 
  |  
  |             while (vec2 < upper_bound) 
  |             { 
  |                #define exprtk_loop(N)                          \ 
  |                vec2[N] = Operation::process(vec0[N], vec1[N]); \ 
  |  
  |                exprtk_loop( 0) exprtk_loop( 1) 
  |                exprtk_loop( 2) exprtk_loop( 3) 
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                exprtk_loop( 4) exprtk_loop( 5) 
  |                exprtk_loop( 6) exprtk_loop( 7) 
  |                exprtk_loop( 8) exprtk_loop( 9) 
  |                exprtk_loop(10) exprtk_loop(11) 
  |                exprtk_loop(12) exprtk_loop(13) 
  |                exprtk_loop(14) exprtk_loop(15) 
  |                #endif 
  |  
  |                vec0 += lud.batch_size; 
  |                vec1 += lud.batch_size; 
  |                vec2 += lud.batch_size; 
  |             } 
  |  
  |             int i = 0; 
  |  
  |             switch (lud.remainder) 
  |             { 
  |                #define case_stmt(N)                                              \ 
  |                case N : { vec2[i] = Operation::process(vec0[i], vec1[i]); ++i; } \ 
  |                exprtk_fallthrough                                                \ 
  |  
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                case_stmt(15) case_stmt(14) 
  |                case_stmt(13) case_stmt(12) 
  |                case_stmt(11) case_stmt(10) 
  |                case_stmt( 9) case_stmt( 8) 
  |                case_stmt( 7) case_stmt( 6) 
  |                case_stmt( 5) case_stmt( 4) 
  |                #endif 
  |                case_stmt( 3) case_stmt( 2) 
  |                case_stmt( 1) 
  |                default: break; 
  |             } 
  |  
  |             #undef exprtk_loop 
  |             #undef case_stmt 
  |  
  |             return (vds().data())[0]; 
  |          } 
  |  
  |          vector_node_ptr vec() const exprtk_override 
  |          { 
  |             return memory_context_.temp_vec_node_; 
  |          } 
  |  
  |          vector_node_ptr vec() exprtk_override 
  |          { 
  |             return memory_context_.temp_vec_node_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecvecarith; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return initialised_; 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return std::min( 
  |                vec0_node_ptr_->vec_holder().size(), 
  |                vec1_node_ptr_->vec_holder().size()); 
  |          } 
  |  
  |          std::size_t base_size() const exprtk_override 
  |          { 
  |             return std::min( 
  |                vec0_node_ptr_->vec_holder().base_size(), 
  |                vec1_node_ptr_->vec_holder().base_size()); 
  |          } 
  |  
  |          vds_t& vds() exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |          const vds_t& vds() const exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |       private: 
  |  
  |          vector_node_ptr vec0_node_ptr_; 
  |          vector_node_ptr vec1_node_ptr_; 
  |          bool            initialised_; 
  |          vds_t           vds_; 
  |          memory_context  memory_context_; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class vec_binop_vecval_node exprtk_final 
  |                                   : public binary_node     <T> 
  |                                   , public vector_interface<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef vector_node<T>*     vector_node_ptr; 
  |          typedef vector_holder<T>    vector_holder_t; 
  |          typedef vector_holder_t*    vector_holder_ptr; 
  |          typedef vec_data_store<T>   vds_t; 
  |          typedef memory_context_t<T> memory_context; 
  |  
  |          using binary_node<T>::branch; 
  |  
  |          vec_binop_vecval_node(const operator_type& opr, 
  |                                expression_ptr branch0, 
  |                                expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , vec0_node_ptr_(0) 
  |          { 
  |             bool v0_is_ivec = false; 
  |  
  |             if (is_vector_node(branch(0))) 
  |             { 
  |                vec0_node_ptr_ = static_cast<vector_node_ptr>(branch(0)); 
  |             } 
  |             else if (is_ivector_node(branch(0))) 
  |             { 
  |                vector_interface<T>* vi = reinterpret_cast<vector_interface<T>*>(0); 
  |  
  |                if (0 != (vi = dynamic_cast<vector_interface<T>*>(branch(0)))) 
  |                { 
  |                   vec0_node_ptr_ = vi->vec(); 
  |                   v0_is_ivec     = true; 
  |                } 
  |             } 
  |  
  |             if (vec0_node_ptr_) 
  |             { 
  |                if (v0_is_ivec) 
  |                   vds() = vec0_node_ptr_->vds(); 
  |                else 
  |                   vds() = vds_t(vec0_node_ptr_->base_size()); 
  |  
  |                memory_context_ = make_memory_context(vec0_node_ptr_->vec_holder(), vds()); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |         ~vec_binop_vecval_node() 
  |          { 
  |             memory_context_.clear(); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |                         branch(0)->value(); 
  |             const T v = branch(1)->value(); 
  |  
  |             const T* vec0 = vec0_node_ptr_->vds().data(); 
  |                   T* vec1 = vds().data(); 
  |  
  |             loop_unroll::details lud(size()); 
  |             const T* upper_bound = vec0 + lud.upper_bound; 
  |  
  |             while (vec0 < upper_bound) 
  |             { 
  |                #define exprtk_loop(N)                    \ 
  |                vec1[N] = Operation::process(vec0[N], v); \ 
  |  
  |                exprtk_loop( 0) exprtk_loop( 1) 
  |                exprtk_loop( 2) exprtk_loop( 3) 
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                exprtk_loop( 4) exprtk_loop( 5) 
  |                exprtk_loop( 6) exprtk_loop( 7) 
  |                exprtk_loop( 8) exprtk_loop( 9) 
  |                exprtk_loop(10) exprtk_loop(11) 
  |                exprtk_loop(12) exprtk_loop(13) 
  |                exprtk_loop(14) exprtk_loop(15) 
  |                #endif 
  |  
  |                vec0 += lud.batch_size; 
  |                vec1 += lud.batch_size; 
  |             } 
  |  
  |             int i = 0; 
  |  
  |             switch (lud.remainder) 
  |             { 
  |                #define case_stmt(N,fall_through)                           \ 
  |                case N : { vec1[i] = Operation::process(vec0[i], v); ++i; } \ 
  |                fall_through                                                \ 
  |  
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                case_stmt(15, exprtk_fallthrough) case_stmt(14, exprtk_fallthrough) 
  |                case_stmt(13, exprtk_fallthrough) case_stmt(12, exprtk_fallthrough) 
  |                case_stmt(11, exprtk_fallthrough) case_stmt(10, exprtk_fallthrough) 
  |                case_stmt( 9, exprtk_fallthrough) case_stmt( 8, exprtk_fallthrough) 
  |                case_stmt( 7, exprtk_fallthrough) case_stmt( 6, exprtk_fallthrough) 
  |                case_stmt( 5, exprtk_fallthrough) case_stmt( 4, exprtk_fallthrough) 
  |                #endif 
  |                case_stmt( 3, exprtk_fallthrough) case_stmt( 2, exprtk_fallthrough) 
  |                case_stmt( 1, (void)0;) 
  |             } 
  |  
  |             #undef exprtk_loop 
  |             #undef case_stmt 
  |  
  |             return (vds().data())[0]; 
  |          } 
  |  
  |          vector_node_ptr vec() const exprtk_override 
  |          { 
  |             return memory_context_.temp_vec_node_; 
  |          } 
  |  
  |          vector_node_ptr vec() exprtk_override 
  |          { 
  |             return memory_context_.temp_vec_node_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecvalarith; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                vec0_node_ptr_          && 
  |                (size() <= base_size()) && 
  |                binary_node<T>::valid(); 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return vec0_node_ptr_->size(); 
  |          } 
  |  
  |          std::size_t base_size() const exprtk_override 
  |          { 
  |             return vec0_node_ptr_->vec_holder().base_size(); 
  |          } 
  |  
  |          vds_t& vds() exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |          const vds_t& vds() const exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |       private: 
  |  
  |          vector_node_ptr   vec0_node_ptr_; 
  |          vds_t             vds_; 
  |          memory_context    memory_context_; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class vec_binop_valvec_node exprtk_final 
  |                                   : public binary_node     <T> 
  |                                   , public vector_interface<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef vector_node<T>*     vector_node_ptr; 
  |          typedef vector_holder<T>    vector_holder_t; 
  |          typedef vector_holder_t*    vector_holder_ptr; 
  |          typedef vec_data_store<T>   vds_t; 
  |          typedef memory_context_t<T> memory_context; 
  |  
  |          using binary_node<T>::branch; 
  |  
  |          vec_binop_valvec_node(const operator_type& opr, 
  |                                expression_ptr branch0, 
  |                                expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , vec1_node_ptr_(0) 
  |          { 
  |             bool v1_is_ivec = false; 
  |  
  |             if (is_vector_node(branch(1))) 
  |             { 
  |                vec1_node_ptr_ = static_cast<vector_node_ptr>(branch(1)); 
  |             } 
  |             else if (is_ivector_node(branch(1))) 
  |             { 
  |                vector_interface<T>* vi = reinterpret_cast<vector_interface<T>*>(0); 
  |  
  |                if (0 != (vi = dynamic_cast<vector_interface<T>*>(branch(1)))) 
  |                { 
  |                   vec1_node_ptr_ = vi->vec(); 
  |                   v1_is_ivec     = true; 
  |                } 
  |             } 
  |  
  |             if (vec1_node_ptr_) 
  |             { 
  |                if (v1_is_ivec) 
  |                   vds() = vec1_node_ptr_->vds(); 
  |                else 
  |                   vds() = vds_t(vec1_node_ptr_->base_size()); 
  |  
  |                memory_context_ = make_memory_context(vec1_node_ptr_->vec_holder(), vds()); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |         ~vec_binop_valvec_node() 
  |          { 
  |             memory_context_.clear(); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             const T v = branch(0)->value(); 
  |                         branch(1)->value(); 
  |  
  |                   T* vec0 = vds().data(); 
  |             const T* vec1 = vec1_node_ptr_->vds().data(); 
  |  
  |             loop_unroll::details lud(size()); 
  |             const T* upper_bound = vec0 + lud.upper_bound; 
  |  
  |             while (vec0 < upper_bound) 
  |             { 
  |                #define exprtk_loop(N)                    \ 
  |                vec0[N] = Operation::process(v, vec1[N]); \ 
  |  
  |                exprtk_loop( 0) exprtk_loop( 1) 
  |                exprtk_loop( 2) exprtk_loop( 3) 
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                exprtk_loop( 4) exprtk_loop( 5) 
  |                exprtk_loop( 6) exprtk_loop( 7) 
  |                exprtk_loop( 8) exprtk_loop( 9) 
  |                exprtk_loop(10) exprtk_loop(11) 
  |                exprtk_loop(12) exprtk_loop(13) 
  |                exprtk_loop(14) exprtk_loop(15) 
  |                #endif 
  |  
  |                vec0 += lud.batch_size; 
  |                vec1 += lud.batch_size; 
  |             } 
  |  
  |             int i = 0; 
  |  
  |             switch (lud.remainder) 
  |             { 
  |                #define case_stmt(N,fall_through)                           \ 
  |                case N : { vec0[i] = Operation::process(v, vec1[i]); ++i; } \ 
  |                fall_through                                                \ 
  |  
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                case_stmt(15, exprtk_fallthrough) case_stmt(14, exprtk_fallthrough) 
  |                case_stmt(13, exprtk_fallthrough) case_stmt(12, exprtk_fallthrough) 
  |                case_stmt(11, exprtk_fallthrough) case_stmt(10, exprtk_fallthrough) 
  |                case_stmt( 9, exprtk_fallthrough) case_stmt( 8, exprtk_fallthrough) 
  |                case_stmt( 7, exprtk_fallthrough) case_stmt( 6, exprtk_fallthrough) 
  |                case_stmt( 5, exprtk_fallthrough) case_stmt( 4, exprtk_fallthrough) 
  |                #endif 
  |                case_stmt( 3, exprtk_fallthrough) case_stmt( 2, exprtk_fallthrough) 
  |                case_stmt( 1, (void)0;) 
  |             } 
  |  
  |             #undef exprtk_loop 
  |             #undef case_stmt 
  |  
  |             return (vds().data())[0]; 
  |          } 
  |  
  |          vector_node_ptr vec() const exprtk_override 
  |          { 
  |             return memory_context_.temp_vec_node_; 
  |          } 
  |  
  |          vector_node_ptr vec() exprtk_override 
  |          { 
  |             return memory_context_.temp_vec_node_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecvalarith; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                vec1_node_ptr_               && 
  |                (size() <= base_size())      && 
  |                (vds_.size() <= base_size()) && 
  |                binary_node<T>::valid(); 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return vec1_node_ptr_->vec_holder().size(); 
  |          } 
  |  
  |          std::size_t base_size() const exprtk_override 
  |          { 
  |             return vec1_node_ptr_->vec_holder().base_size(); 
  |          } 
  |  
  |          vds_t& vds() exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |          const vds_t& vds() const exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |       private: 
  |  
  |          vector_node_ptr   vec1_node_ptr_; 
  |          vds_t             vds_; 
  |          memory_context    memory_context_; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class unary_vector_node exprtk_final 
  |                               : public unary_node      <T> 
  |                               , public vector_interface<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef vector_node<T>*     vector_node_ptr; 
  |          typedef vector_holder<T>    vector_holder_t; 
  |          typedef vector_holder_t*    vector_holder_ptr; 
  |          typedef vec_data_store<T>   vds_t; 
  |          typedef memory_context_t<T> memory_context; 
  |  
  |          using expression_node<T>::branch; 
  |  
  |          unary_vector_node(const operator_type& opr, expression_ptr branch0) 
  |          : unary_node<T>(opr, branch0) 
  |          , vec0_node_ptr_(0) 
  |          { 
  |             bool vec0_is_ivec = false; 
  |  
  |             if (is_vector_node(branch(0))) 
  |             { 
  |                vec0_node_ptr_ = static_cast<vector_node_ptr>(branch(0)); 
  |             } 
  |             else if (is_ivector_node(branch(0))) 
  |             { 
  |                vector_interface<T>* vi = reinterpret_cast<vector_interface<T>*>(0); 
  |  
  |                if (0 != (vi = dynamic_cast<vector_interface<T>*>(branch(0)))) 
  |                { 
  |                   vec0_node_ptr_ = vi->vec(); 
  |                   vec0_is_ivec   = true; 
  |                } 
  |             } 
  |  
  |             if (vec0_node_ptr_) 
  |             { 
  |                if (vec0_is_ivec) 
  |                   vds_ = vec0_node_ptr_->vds(); 
  |                else 
  |                   vds_ = vds_t(vec0_node_ptr_->base_size()); 
  |  
  |                memory_context_ = make_memory_context(vec0_node_ptr_->vec_holder(), vds()); 
  |             } 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |         ~unary_vector_node() 
  |          { 
  |             memory_context_.clear(); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             branch()->value(); 
  |  
  |             const T* vec0 = vec0_node_ptr_->vds().data(); 
  |                   T* vec1 = vds().data(); 
  |  
  |             loop_unroll::details lud(size()); 
  |             const T* upper_bound = vec0 + lud.upper_bound; 
  |  
  |             while (vec0 < upper_bound) 
  |             { 
  |                #define exprtk_loop(N)                 \ 
  |                vec1[N] = Operation::process(vec0[N]); \ 
  |  
  |                exprtk_loop( 0) exprtk_loop( 1) 
  |                exprtk_loop( 2) exprtk_loop( 3) 
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                exprtk_loop( 4) exprtk_loop( 5) 
  |                exprtk_loop( 6) exprtk_loop( 7) 
  |                exprtk_loop( 8) exprtk_loop( 9) 
  |                exprtk_loop(10) exprtk_loop(11) 
  |                exprtk_loop(12) exprtk_loop(13) 
  |                exprtk_loop(14) exprtk_loop(15) 
  |                #endif 
  |  
  |                vec0 += lud.batch_size; 
  |                vec1 += lud.batch_size; 
  |             } 
  |  
  |             int i = 0; 
  |  
  |             switch (lud.remainder) 
  |             { 
  |                #define case_stmt(N)                                     \ 
  |                case N : { vec1[i] = Operation::process(vec0[i]); ++i; } \ 
  |                exprtk_fallthrough                                       \ 
  |  
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                case_stmt(15) case_stmt(14) 
  |                case_stmt(13) case_stmt(12) 
  |                case_stmt(11) case_stmt(10) 
  |                case_stmt( 9) case_stmt( 8) 
  |                case_stmt( 7) case_stmt( 6) 
  |                case_stmt( 5) case_stmt( 4) 
  |                #endif 
  |                case_stmt( 3) case_stmt( 2) 
  |                case_stmt( 1) 
  |                default: break; 
  |             } 
  |  
  |             #undef exprtk_loop 
  |             #undef case_stmt 
  |  
  |             return (vds().data())[0]; 
  |          } 
  |  
  |          vector_node_ptr vec() const exprtk_override 
  |          { 
  |             return memory_context_.temp_vec_node_; 
  |          } 
  |  
  |          vector_node_ptr vec() exprtk_override 
  |          { 
  |             return memory_context_.temp_vec_node_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecunaryop; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return vec0_node_ptr_ && unary_node<T>::valid(); 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return vec0_node_ptr_->vec_holder().size(); 
  |          } 
  |  
  |          std::size_t base_size() const exprtk_override 
  |          { 
  |             return vec0_node_ptr_->vec_holder().base_size(); 
  |          } 
  |  
  |          vds_t& vds() exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |          const vds_t& vds() const exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |       private: 
  |  
  |          vector_node_ptr vec0_node_ptr_; 
  |          vds_t           vds_; 
  |          memory_context  memory_context_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class conditional_vector_node exprtk_final 
  |                                     : public expression_node <T> 
  |                                     , public vector_interface<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node <T>* expression_ptr; 
  |          typedef vector_interface<T>* vec_interface_ptr; 
  |          typedef vector_node     <T>* vector_node_ptr; 
  |          typedef vector_holder   <T>  vector_holder_t; 
  |          typedef vector_holder_t*     vector_holder_ptr; 
  |          typedef vec_data_store  <T>  vds_t; 
  |          typedef memory_context_t<T> memory_context; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          conditional_vector_node(expression_ptr condition, 
  |                                  expression_ptr consequent, 
  |                                  expression_ptr alternative) 
  |          : consequent_node_ptr_ (0) 
  |          , alternative_node_ptr_(0) 
  |          , temp_vec_node_       (0) 
  |          , temp_                (0) 
  |          , result_vec_size_     (0) 
  |          , initialised_         (false) 
  |          { 
  |             construct_branch_pair(condition_  , condition  ); 
  |             construct_branch_pair(consequent_ , consequent ); 
  |             construct_branch_pair(alternative_, alternative); 
  |  
  |             if (details::is_ivector_node(consequent_.first)) 
  |             { 
  |                vec_interface_ptr ivec_ptr = dynamic_cast<vec_interface_ptr>(consequent_.first); 
  |  
  |                if (0 != ivec_ptr) 
  |                { 
  |                   consequent_node_ptr_ = ivec_ptr->vec(); 
  |                } 
  |             } 
  |  
  |             if (details::is_ivector_node(alternative_.first)) 
  |             { 
  |                vec_interface_ptr ivec_ptr = dynamic_cast<vec_interface_ptr>(alternative_.first); 
  |  
  |                if (0 != ivec_ptr) 
  |                { 
  |                   alternative_node_ptr_ = ivec_ptr->vec(); 
  |                } 
  |             } 
  |  
  |             if (consequent_node_ptr_ && alternative_node_ptr_) 
  |             { 
  |                const std::size_t vec_size = 
  |                   std::max(consequent_node_ptr_ ->vec_holder().base_size(), 
  |                            alternative_node_ptr_->vec_holder().base_size()); 
  |  
  |                vds_            = vds_t(vec_size); 
  |                memory_context_ = make_memory_context( 
  |                   consequent_node_ptr_ ->vec_holder(), 
  |                   alternative_node_ptr_->vec_holder(), 
  |                   vds()); 
  |  
  |                initialised_ = (vec_size > 0); 
  |             } 
  |  
  |             assert(initialised_); 
  |          } 
  |  
  |         ~conditional_vector_node() 
  |          { 
  |             memory_context_.clear(); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             T result = T(0); 
  |             T* source_vector = 0; 
  |             T* result_vector = vds().data(); 
  |  
  |             if (is_true(condition_)) 
  |             { 
  |                result           = consequent_.first->value(); 
  |                source_vector    = consequent_node_ptr_->vds().data(); 
  |                result_vec_size_ = consequent_node_ptr_->size(); 
  |             } 
  |             else 
  |             { 
  |                result           = alternative_.first->value(); 
  |                source_vector    = alternative_node_ptr_->vds().data(); 
  |                result_vec_size_ = alternative_node_ptr_->size(); 
  |             } 
  |  
  |             for (std::size_t i = 0; i < result_vec_size_; ++i) 
  |             { 
  |                result_vector[i] = source_vector[i]; 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          vector_node_ptr vec() const exprtk_override 
  |          { 
  |             return memory_context_.temp_vec_node_; 
  |          } 
  |  
  |          vector_node_ptr vec() exprtk_override 
  |          { 
  |             return memory_context_.temp_vec_node_; 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vecondition; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return 
  |                initialised_                                      && 
  |                condition_  .first && condition_  .first->valid() && 
  |                consequent_ .first && consequent_ .first->valid() && 
  |                alternative_.first && alternative_.first->valid() && 
  |                size() <= base_size(); 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return result_vec_size_; 
  |          } 
  |  
  |          std::size_t base_size() const exprtk_override 
  |          { 
  |             return std::min( 
  |                consequent_node_ptr_ ->vec_holder().base_size(), 
  |                alternative_node_ptr_->vec_holder().base_size()); 
  |          } 
  |  
  |          vds_t& vds() exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |          const vds_t& vds() const exprtk_override 
  |          { 
  |             return vds_; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(condition_   , node_delete_list); 
  |             expression_node<T>::ndb_t::collect(consequent_  , node_delete_list); 
  |             expression_node<T>::ndb_t::collect(alternative_ , node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth 
  |                (condition_, consequent_, alternative_); 
  |          } 
  |  
  |       private: 
  |  
  |          branch_t            condition_; 
  |          branch_t            consequent_; 
  |          branch_t            alternative_; 
  |          vector_node_ptr     consequent_node_ptr_; 
  |          vector_node_ptr     alternative_node_ptr_; 
  |          vector_node_ptr     temp_vec_node_; 
  |          vector_holder_ptr   temp_; 
  |          vds_t               vds_; 
  |          mutable std::size_t result_vec_size_; 
  |          bool                initialised_; 
  |          memory_context      memory_context_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class scand_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          using binary_node<T>::branch; 
  |  
  |          scand_node(const operator_type& opr, 
  |                     expression_ptr branch0, 
  |                     expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          { 
  |             assert(binary_node<T>::valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return ( 
  |                      std::not_equal_to<T>() 
  |                         (T(0),branch(0)->value()) && 
  |                      std::not_equal_to<T>() 
  |                         (T(0),branch(1)->value()) 
  |                    ) ? T(1) : T(0); 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       class scor_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          using binary_node<T>::branch; 
  |  
  |          scor_node(const operator_type& opr, 
  |                    expression_ptr branch0, 
  |                    expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          { 
  |             assert(binary_node<T>::valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return ( 
  |                      std::not_equal_to<T>() 
  |                         (T(0),branch(0)->value()) || 
  |                      std::not_equal_to<T>() 
  |                         (T(0),branch(1)->value()) 
  |                    ) ? T(1) : T(0); 
  |          } 
  |       }; 
  |  
  |       template <typename T, typename IFunction, std::size_t N> 
  |       class function_N_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          // Function of N parameters. 
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |          typedef IFunction ifunction; 
  |  
  |          explicit function_N_node(ifunction* func) 
  |          : function_((N == func->param_count) ? func : reinterpret_cast<ifunction*>(0)) 
  |          , parameter_count_(func->param_count) 
  |          , initialised_(false) 
  |          {} 
  |  
  |          template <std::size_t NumBranches> 
  |          bool init_branches(expression_ptr (&b)[NumBranches]) 
  |          { 
  |             // Needed for incompetent and broken msvc compiler versions 
  |             #ifdef _MSC_VER 
  |              #pragma warning(push) 
  |              #pragma warning(disable: 4127) 
  |             #endif 
  |  
  |             if (N != NumBranches) 
  |             { 
  |                return false; 
  |             } 
  |  
  |             for (std::size_t i = 0; i < NumBranches; ++i) 
  |             { 
  |                if (b[i] && b[i]->valid()) 
  |                   branch_[i] = std::make_pair(b[i],branch_deletable(b[i])); 
  |                else 
  |                   return false; 
  |             } 
  |  
  |             initialised_ = function_; 
  |             assert(valid()); 
  |             return initialised_; 
  |  
  |             #ifdef _MSC_VER 
  |              #pragma warning(pop) 
  |             #endif 
  |          } 
  |  
  |          inline bool operator <(const function_N_node<T,IFunction,N>& fn) const 
  |          { 
  |             return this < (&fn); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             // Needed for incompetent and broken msvc compiler versions 
  |             #ifdef _MSC_VER 
  |              #pragma warning(push) 
  |              #pragma warning(disable: 4127) 
  |             #endif 
  |  
  |             T v[N]; 
  |             evaluate_branches<T,N>::execute(v,branch_); 
  |             return invoke<T,N>::execute(*function_,v); 
  |  
  |             #ifdef _MSC_VER 
  |              #pragma warning(pop) 
  |             #endif 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_function; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return initialised_; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(branch_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::template compute_node_depth<N>(branch_); 
  |          } 
  |  
  |          template <typename T_, std::size_t BranchCount> 
  |          struct evaluate_branches 
  |          { 
  |             static inline void execute(T_ (&v)[BranchCount], const branch_t (&b)[BranchCount]) 
  |             { 
  |                for (std::size_t i = 0; i < BranchCount; ++i) 
  |                { 
  |                   v[i] = b[i].first->value(); 
  |                } 
  |             } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct evaluate_branches <T_,6> 
  |          { 
  |             static inline void execute(T_ (&v)[6], const branch_t (&b)[6]) 
  |             { 
  |                v[0] = b[0].first->value(); 
  |                v[1] = b[1].first->value(); 
  |                v[2] = b[2].first->value(); 
  |                v[3] = b[3].first->value(); 
  |                v[4] = b[4].first->value(); 
  |                v[5] = b[5].first->value(); 
  |             } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct evaluate_branches <T_,5> 
  |          { 
  |             static inline void execute(T_ (&v)[5], const branch_t (&b)[5]) 
  |             { 
  |                v[0] = b[0].first->value(); 
  |                v[1] = b[1].first->value(); 
  |                v[2] = b[2].first->value(); 
  |                v[3] = b[3].first->value(); 
  |                v[4] = b[4].first->value(); 
  |             } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct evaluate_branches <T_,4> 
  |          { 
  |             static inline void execute(T_ (&v)[4], const branch_t (&b)[4]) 
  |             { 
  |                v[0] = b[0].first->value(); 
  |                v[1] = b[1].first->value(); 
  |                v[2] = b[2].first->value(); 
  |                v[3] = b[3].first->value(); 
  |             } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct evaluate_branches <T_,3> 
  |          { 
  |             static inline void execute(T_ (&v)[3], const branch_t (&b)[3]) 
  |             { 
  |                v[0] = b[0].first->value(); 
  |                v[1] = b[1].first->value(); 
  |                v[2] = b[2].first->value(); 
  |             } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct evaluate_branches <T_,2> 
  |          { 
  |             static inline void execute(T_ (&v)[2], const branch_t (&b)[2]) 
  |             { 
  |                v[0] = b[0].first->value(); 
  |                v[1] = b[1].first->value(); 
  |             } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct evaluate_branches <T_,1> 
  |          { 
  |             static inline void execute(T_ (&v)[1], const branch_t (&b)[1]) 
  |             { 
  |                v[0] = b[0].first->value(); 
  |             } 
  |          }; 
  |  
  |          template <typename T_, std::size_t ParamCount> 
  |          struct invoke { static inline T execute(ifunction&, branch_t (&)[ParamCount]) { return std::numeric_limits<T_>::quiet_NaN(); } }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,20> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[20]) 
  |             { return f(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7],v[8],v[9],v[10],v[11],v[12],v[13],v[14],v[15],v[16],v[17],v[18],v[19]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,19> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[19]) 
  |             { return f(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7],v[8],v[9],v[10],v[11],v[12],v[13],v[14],v[15],v[16],v[17],v[18]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,18> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[18]) 
  |             { return f(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9], v[10], v[11], v[12], v[13], v[14], v[15], v[16], v[17]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,17> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[17]) 
  |             { return f(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9], v[10], v[11], v[12], v[13], v[14], v[15], v[16]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,16> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[16]) 
  |             { return f(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9], v[10], v[11], v[12], v[13], v[14], v[15]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,15> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[15]) 
  |             { return f(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9], v[10], v[11], v[12], v[13], v[14]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,14> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[14]) 
  |             { return f(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9], v[10], v[11], v[12], v[13]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,13> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[13]) 
  |             { return f(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9], v[10], v[11], v[12]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,12> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[12]) 
  |             { return f(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9], v[10], v[11]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,11> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[11]) 
  |             { return f(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9], v[10]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,10> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[10]) 
  |             { return f(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,9> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[9]) 
  |             { return f(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,8> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[8]) 
  |             { return f(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,7> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[7]) 
  |             { return f(v[0], v[1], v[2], v[3], v[4], v[5], v[6]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,6> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[6]) 
  |             { return f(v[0], v[1], v[2], v[3], v[4], v[5]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,5> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[5]) 
  |             { return f(v[0], v[1], v[2], v[3], v[4]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,4> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[4]) 
  |             { return f(v[0], v[1], v[2], v[3]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,3> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[3]) 
  |             { return f(v[0], v[1], v[2]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,2> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[2]) 
  |             { return f(v[0], v[1]); } 
  |          }; 
  |  
  |          template <typename T_> 
  |          struct invoke<T_,1> 
  |          { 
  |             static inline T_ execute(ifunction& f, T_ (&v)[1]) 
  |             { return f(v[0]); } 
  |          }; 
  |  
  |       private: 
  |  
  |          ifunction*  function_; 
  |          std::size_t parameter_count_; 
  |          branch_t    branch_[N]; 
  |          bool        initialised_; 
  |       }; 
  |  
  |       template <typename T, typename IFunction> 
  |       class function_N_node<T,IFunction,0> exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef IFunction ifunction; 
  |  
  |          explicit function_N_node(ifunction* func) 
  |          : function_((0 == func->param_count) ? func : reinterpret_cast<ifunction*>(0)) 
  |          { 
  |             assert(valid()); 
  |          } 
  |  
  |          inline bool operator <(const function_N_node<T,IFunction,0>& fn) const 
  |          { 
  |             return this < (&fn); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return (*function_)(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_function; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return function_; 
  |          } 
  |  
  |       private: 
  |  
  |          ifunction* function_; 
  |       }; 
  |  
  |       template <typename T, typename VarArgFunction> 
  |       class vararg_function_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |  
  |          vararg_function_node(VarArgFunction*  func, 
  |                               const std::vector<expression_ptr>& arg_list) 
  |          : function_(func) 
  |          , arg_list_(arg_list) 
  |          { 
  |             value_list_.resize(arg_list.size(),std::numeric_limits<T>::quiet_NaN()); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline bool operator <(const vararg_function_node<T,VarArgFunction>& fn) const 
  |          { 
  |             return this < (&fn); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             populate_value_list(); 
  |             return (*function_)(value_list_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_vafunction; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return function_; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             for (std::size_t i = 0; i < arg_list_.size(); ++i) 
  |             { 
  |                if (arg_list_[i] && !details::is_variable_node(arg_list_[i])) 
  |                { 
  |                   node_delete_list.push_back(&arg_list_[i]); 
  |                } 
  |             } 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(arg_list_); 
  |          } 
  |  
  |       private: 
  |  
  |          inline void populate_value_list() const 
  |          { 
  |             for (std::size_t i = 0; i < arg_list_.size(); ++i) 
  |             { 
  |                value_list_[i] = arg_list_[i]->value(); 
  |             } 
  |          } 
  |  
  |          VarArgFunction* function_; 
  |          std::vector<expression_ptr> arg_list_; 
  |          mutable std::vector<T> value_list_; 
  |       }; 
  |  
  |       template <typename T, typename GenericFunction> 
  |       class generic_function_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef type_store<T>       type_store_t; 
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef variable_node<T>    variable_node_t; 
  |          typedef vector_node<T>      vector_node_t; 
  |          typedef variable_node_t*    variable_node_ptr_t; 
  |          typedef vector_node_t*      vector_node_ptr_t; 
  |          typedef range_interface<T>  range_interface_t; 
  |          typedef range_data_type<T>  range_data_type_t; 
  |          typedef typename range_interface<T>::range_t range_t; 
  |  
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |          typedef vector_holder<T>* vh_t; 
  |          typedef vector_view<T>*   vecview_t; 
  |  
  |          typedef std::vector<T>                 tmp_vs_t; 
  |          typedef std::vector<type_store_t>      typestore_list_t; 
  |          typedef std::vector<range_data_type_t> range_list_t; 
  |  
  |          explicit generic_function_node(const std::vector<expression_ptr>& arg_list, 
  |                                         GenericFunction* func = reinterpret_cast<GenericFunction*>(0)) 
  |          : function_(func) 
  |          , arg_list_(arg_list) 
  |          {} 
  |  
  |          virtual ~generic_function_node() 
  |          { 
  |             for (std::size_t i = 0; i < vv_list_.size(); ++i) 
  |             { 
  |                vecview_t& vv = vv_list_[i]; 
  |                if (vv && typestore_list_[i].vec_data) 
  |                { 
  |                   vv->remove_ref(&typestore_list_[i].vec_data); 
  |                   typestore_list_[i].vec_data = 0; 
  |                } 
  |             } 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(branch_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override exprtk_final 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(branch_); 
  |          } 
  |  
  |          virtual bool init_branches() 
  |          { 
  |             expr_as_vec1_store_.resize(arg_list_.size(), T(0)               ); 
  |             typestore_list_    .resize(arg_list_.size(), type_store_t()     ); 
  |             range_list_        .resize(arg_list_.size(), range_data_type_t()); 
  |             branch_            .resize(arg_list_.size(), branch_t(reinterpret_cast<expression_ptr>(0),false)); 
  |             vv_list_           .resize(arg_list_.size(), vecview_t(0)); 
  |  
  |             for (std::size_t i = 0; i < arg_list_.size(); ++i) 
  |             { 
  |                type_store_t& ts = typestore_list_[i]; 
  |  
  |                if (0 == arg_list_[i]) 
  |                   return false; 
  |                else if (is_ivector_node(arg_list_[i])) 
  |                { 
  |                   vector_interface<T>* vi = reinterpret_cast<vector_interface<T>*>(0); 
  |  
  |                   if (0 == (vi = dynamic_cast<vector_interface<T>*>(arg_list_[i]))) 
  |                      return false; 
  |  
  |                   ts.size = vi->size(); 
  |                   ts.data = vi->vds().data(); 
  |                   ts.type = type_store_t::e_vector; 
  |  
  |                   if ( 
  |                        vi->vec()->vec_holder().rebaseable() && 
  |                        vi->vec()->vec_holder().rebaseable_instance() 
  |                      ) 
  |                   { 
  |                      vv_list_[i] = vi->vec()->vec_holder().rebaseable_instance(); 
  |                      vv_list_[i]->set_ref(&ts.vec_data); 
  |                   } 
  |                } 
  |                #ifndef exprtk_disable_string_capabilities 
  |                else if (is_generally_string_node(arg_list_[i])) 
  |                { 
  |                   string_base_node<T>* sbn = reinterpret_cast<string_base_node<T>*>(0); 
  |  
  |                   if (0 == (sbn = dynamic_cast<string_base_node<T>*>(arg_list_[i]))) 
  |                      return false; 
  |  
  |                   ts.size = sbn->size(); 
  |                   ts.data = reinterpret_cast<void*>(const_cast<char_ptr>(sbn->base())); 
  |                   ts.type = type_store_t::e_string; 
  |  
  |                   range_list_[i].data      = ts.data; 
  |                   range_list_[i].size      = ts.size; 
  |                   range_list_[i].type_size = sizeof(char); 
  |                   range_list_[i].str_node  = sbn; 
  |  
  |                   range_interface_t* ri = reinterpret_cast<range_interface_t*>(0); 
  |  
  |                   if (0 == (ri = dynamic_cast<range_interface_t*>(arg_list_[i]))) 
  |                      return false; 
  |  
  |                   const range_t& rp = ri->range_ref(); 
  |  
  |                   if ( 
  |                        rp.const_range() && 
  |                        is_const_string_range_node(arg_list_[i]) 
  |                      ) 
  |                   { 
  |                      ts.size = rp.const_size(); 
  |                      ts.data = static_cast<char_ptr>(ts.data) + rp.n0_c.second; 
  |                      range_list_[i].range = reinterpret_cast<range_t*>(0); 
  |                   } 
  |                   else 
  |                   { 
  |                      range_list_[i].range = &(ri->range_ref()); 
  |                      range_param_list_.push_back(i); 
  |                   } 
  |                } 
  |                #endif 
  |                else if (is_variable_node(arg_list_[i])) 
  |                { 
  |                   variable_node_ptr_t var = variable_node_ptr_t(0); 
  |  
  |                   if (0 == (var = dynamic_cast<variable_node_ptr_t>(arg_list_[i]))) 
  |                      return false; 
  |  
  |                   ts.size = 1; 
  |                   ts.data = &var->ref(); 
  |                   ts.type = type_store_t::e_scalar; 
  |                } 
  |                else 
  |                { 
  |                   ts.size = 1; 
  |                   ts.data = reinterpret_cast<void*>(&expr_as_vec1_store_[i]); 
  |                   ts.type = type_store_t::e_scalar; 
  |                } 
  |  
  |                branch_[i] = std::make_pair(arg_list_[i],branch_deletable(arg_list_[i])); 
  |             } 
  |  
  |             return true; 
  |          } 
  |  
  |          inline bool operator <(const generic_function_node<T,GenericFunction>& fn) const 
  |          { 
  |             return this < (&fn); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             if (populate_value_list()) 
  |             { 
  |                typedef typename GenericFunction::parameter_list_t parameter_list_t; 
  |  
  |                return (*function_)(parameter_list_t(typestore_list_)); 
  |             } 
  |  
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_genfunction; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return function_; 
  |          } 
  |  
  |       protected: 
  |  
  |          inline virtual bool populate_value_list() const 
  |          { 
  |             for (std::size_t i = 0; i < branch_.size(); ++i) 
  |             { 
  |                expr_as_vec1_store_[i] = branch_[i].first->value(); 
  |             } 
  |  
  |             if (!range_param_list_.empty()) 
  |             { 
  |                assert(range_param_list_.size() <= branch_.size()); 
  |  
  |                for (std::size_t i = 0; i < range_param_list_.size(); ++i) 
  |                { 
  |                   const std::size_t  index = range_param_list_[i]; 
  |                   range_data_type_t& rdt   = range_list_[index]; 
  |  
  |                   const range_t& rp = (*rdt.range); 
  |                   std::size_t r0    = 0; 
  |                   std::size_t r1    = 0; 
  |  
  |                   const std::size_t data_size = 
  |                   #ifndef exprtk_disable_string_capabilities 
  |                      rdt.str_node ? rdt.str_node->size() : rdt.size; 
  |                   #else 
  |                      rdt.size; 
  |                   #endif 
  |  
  |                   if (!rp(r0, r1, data_size)) 
  |                   { 
  |                      return false; 
  |                   } 
  |  
  |                   type_store_t& ts = typestore_list_[index]; 
  |  
  |                   ts.size = rp.cache_size(); 
  |                   #ifndef exprtk_disable_string_capabilities 
  |                   if (ts.type == type_store_t::e_string) 
  |                      ts.data = const_cast<char_ptr>(rdt.str_node->base()) + rp.cache.first; 
  |                   else 
  |                   #endif 
  |                      ts.data = static_cast<char_ptr>(rdt.data) + (rp.cache.first * rdt.type_size); 
  |                } 
  |             } 
  |  
  |             return true; 
  |          } 
  |  
  |          GenericFunction* function_; 
  |          mutable typestore_list_t typestore_list_; 
  |  
  |       private: 
  |  
  |          std::vector<expression_ptr> arg_list_; 
  |          std::vector<branch_t>       branch_; 
  |          std::vector<vecview_t>      vv_list_; 
  |          mutable tmp_vs_t            expr_as_vec1_store_; 
  |          mutable range_list_t        range_list_; 
  |          std::vector<std::size_t>    range_param_list_; 
  |       }; 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       template <typename T, typename StringFunction> 
  |       class string_function_node : public generic_function_node<T,StringFunction> 
  |                                  , public string_base_node<T> 
  |                                  , public range_interface <T> 
  |       { 
  |       public: 
  |  
  |          typedef generic_function_node<T,StringFunction> gen_function_t; 
  |          typedef typename range_interface<T>::range_t range_t; 
  |  
  |          string_function_node(StringFunction* func, 
  |                               const std::vector<typename gen_function_t::expression_ptr>& arg_list) 
  |          : gen_function_t(arg_list,func) 
  |          { 
  |             range_.n0_c = std::make_pair<bool,std::size_t>(true,0); 
  |             range_.n1_c = std::make_pair<bool,std::size_t>(true,0); 
  |             range_.cache.first  = range_.n0_c.second; 
  |             range_.cache.second = range_.n1_c.second; 
  |             assert(valid()); 
  |          } 
  |  
  |          inline bool operator <(const string_function_node<T,StringFunction>& fn) const 
  |          { 
  |             return this < (&fn); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             if (gen_function_t::populate_value_list()) 
  |             { 
  |                typedef typename StringFunction::parameter_list_t parameter_list_t; 
  |  
  |                const T result = 
  |                   (*gen_function_t::function_) 
  |                   ( 
  |                      ret_string_, 
  |                      parameter_list_t(gen_function_t::typestore_list_) 
  |                   ); 
  |  
  |                range_.n1_c.second  = ret_string_.size(); 
  |                range_.cache.second = range_.n1_c.second; 
  |  
  |                return result; 
  |             } 
  |  
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_strfunction; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return gen_function_t::function_; 
  |          } 
  |  
  |          std::string str() const exprtk_override 
  |          { 
  |             return ret_string_; 
  |          } 
  |  
  |          char_cptr base() const exprtk_override 
  |          { 
  |            return &ret_string_[0]; 
  |          } 
  |  
  |          std::size_t size() const exprtk_override 
  |          { 
  |             return ret_string_.size(); 
  |          } 
  |  
  |          range_t& range_ref() exprtk_override 
  |          { 
  |             return range_; 
  |          } 
  |  
  |          const range_t& range_ref() const exprtk_override 
  |          { 
  |             return range_; 
  |          } 
  |  
  |       protected: 
  |  
  |          mutable range_t     range_; 
  |          mutable std::string ret_string_; 
  |       }; 
  |       #endif 
  |  
  |       template <typename T, typename GenericFunction> 
  |       class multimode_genfunction_node : public generic_function_node<T,GenericFunction> 
  |       { 
  |       public: 
  |  
  |          typedef generic_function_node<T,GenericFunction> gen_function_t; 
  |          typedef typename gen_function_t::range_t         range_t; 
  |  
  |          multimode_genfunction_node(GenericFunction* func, 
  |                                     const std::size_t& param_seq_index, 
  |                                     const std::vector<typename gen_function_t::expression_ptr>& arg_list) 
  |          : gen_function_t(arg_list,func) 
  |          , param_seq_index_(param_seq_index) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             assert(gen_function_t::valid()); 
  |  
  |             if (gen_function_t::populate_value_list()) 
  |             { 
  |                typedef typename GenericFunction::parameter_list_t parameter_list_t; 
  |  
  |                return 
  |                   (*gen_function_t::function_) 
  |                   ( 
  |                      param_seq_index_, 
  |                      parameter_list_t(gen_function_t::typestore_list_) 
  |                   ); 
  |             } 
  |  
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override exprtk_final 
  |          { 
  |             return expression_node<T>::e_genfunction; 
  |          } 
  |  
  |       private: 
  |  
  |          std::size_t param_seq_index_; 
  |       }; 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       template <typename T, typename StringFunction> 
  |       class multimode_strfunction_node exprtk_final : public string_function_node<T,StringFunction> 
  |       { 
  |       public: 
  |  
  |          typedef string_function_node<T,StringFunction> str_function_t; 
  |          typedef typename str_function_t::range_t range_t; 
  |  
  |          multimode_strfunction_node(StringFunction* func, 
  |                                     const std::size_t& param_seq_index, 
  |                                     const std::vector<typename str_function_t::expression_ptr>& arg_list) 
  |          : str_function_t(func,arg_list) 
  |          , param_seq_index_(param_seq_index) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             if (str_function_t::populate_value_list()) 
  |             { 
  |                typedef typename StringFunction::parameter_list_t parameter_list_t; 
  |  
  |                const T result = 
  |                   (*str_function_t::function_) 
  |                   ( 
  |                      param_seq_index_, 
  |                      str_function_t::ret_string_, 
  |                      parameter_list_t(str_function_t::typestore_list_) 
  |                   ); 
  |  
  |                str_function_t::range_.n1_c.second  = str_function_t::ret_string_.size(); 
  |                str_function_t::range_.cache.second = str_function_t::range_.n1_c.second; 
  |  
  |                return result; 
  |             } 
  |  
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_strfunction; 
  |          } 
  |  
  |       private: 
  |  
  |          const std::size_t param_seq_index_; 
  |       }; 
  |       #endif 
  |  
  |       class return_exception {}; 
  |  
  |       template <typename T> 
  |       class null_igenfunc 
  |       { 
  |       public: 
  |  
  |          virtual ~null_igenfunc() 
  |          {} 
  |  
  |          typedef type_store<T> generic_type; 
  |          typedef typename generic_type::parameter_list parameter_list_t; 
  |  
  |          inline virtual T operator() (parameter_list_t) 
  |          { 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |       }; 
  |  
  |       #ifndef exprtk_disable_return_statement 
  |       template <typename T> 
  |       class return_node exprtk_final : public generic_function_node<T,null_igenfunc<T> > 
  |       { 
  |       public: 
  |  
  |          typedef results_context<T>   results_context_t; 
  |          typedef null_igenfunc<T>     igeneric_function_t; 
  |          typedef igeneric_function_t* igeneric_function_ptr; 
  |          typedef generic_function_node<T,igeneric_function_t> gen_function_t; 
  |  
  |          return_node(const std::vector<typename gen_function_t::expression_ptr>& arg_list, 
  |                      results_context_t& rc) 
  |          : gen_function_t  (arg_list) 
  |          , results_context_(&rc) 
  |          { 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             if (gen_function_t::populate_value_list()) 
  |             { 
  |                typedef typename type_store<T>::parameter_list parameter_list_t; 
  |  
  |                results_context_-> 
  |                   assign(parameter_list_t(gen_function_t::typestore_list_)); 
  |  
  |                throw return_exception(); 
  |             } 
  |  
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_return; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return results_context_; 
  |          } 
  |  
  |       private: 
  |  
  |          results_context_t* results_context_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class return_envelope_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef results_context<T>  results_context_t; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          return_envelope_node(expression_ptr body, results_context_t& rc) 
  |          : results_context_(&rc  ) 
  |          , return_invoked_ (false) 
  |          { 
  |             construct_branch_pair(body_, body); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             try 
  |             { 
  |                return_invoked_ = false; 
  |                results_context_->clear(); 
  |  
  |                return body_.first->value(); 
  |             } 
  |             catch(const return_exception&) 
  |             { 
  |                return_invoked_ = true; 
  |  
  |                return std::numeric_limits<T>::quiet_NaN(); 
  |             } 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_retenv; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return results_context_ && body_.first; 
  |          } 
  |  
  |          inline bool* retinvk_ptr() 
  |          { 
  |             return &return_invoked_; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(body_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(body_); 
  |          } 
  |  
  |       private: 
  |  
  |          results_context_t* results_context_; 
  |          mutable bool        return_invoked_; 
  |          branch_t                      body_; 
  |       }; 
  |       #endif 
  |  
  |       #define exprtk_define_unary_op(OpName)                    \ 
  |       template <typename T>                                     \ 
  |       struct OpName##_op                                        \ 
  |       {                                                         \ 
  |          typedef typename functor_t<T>::Type Type;              \ 
  |          typedef typename expression_node<T>::node_type node_t; \ 
  |                                                                 \ 
  |          static inline T process(Type v)                        \ 
  |          {                                                      \ 
  |             return numeric:: OpName (v);                        \ 
  |          }                                                      \ 
  |                                                                 \ 
  |          static inline node_t type()                            \ 
  |          {                                                      \ 
  |             return expression_node<T>::e_##OpName;              \ 
  |          }                                                      \ 
  |                                                                 \ 
  |          static inline details::operator_type operation()       \ 
  |          {                                                      \ 
  |             return details::e_##OpName;                         \ 
  |          }                                                      \ 
  |       };                                                        \ 
  |  
  |       exprtk_define_unary_op(abs  ) 
  |       exprtk_define_unary_op(acos ) 
  |       exprtk_define_unary_op(acosh) 
  |       exprtk_define_unary_op(asin ) 
  |       exprtk_define_unary_op(asinh) 
  |       exprtk_define_unary_op(atan ) 
  |       exprtk_define_unary_op(atanh) 
  |       exprtk_define_unary_op(ceil ) 
  |       exprtk_define_unary_op(cos  ) 
  |       exprtk_define_unary_op(cosh ) 
  |       exprtk_define_unary_op(cot  ) 
  |       exprtk_define_unary_op(csc  ) 
  |       exprtk_define_unary_op(d2g  ) 
  |       exprtk_define_unary_op(d2r  ) 
  |       exprtk_define_unary_op(erf  ) 
  |       exprtk_define_unary_op(erfc ) 
  |       exprtk_define_unary_op(exp  ) 
  |       exprtk_define_unary_op(expm1) 
  |       exprtk_define_unary_op(floor) 
  |       exprtk_define_unary_op(frac ) 
  |       exprtk_define_unary_op(g2d  ) 
  |       exprtk_define_unary_op(log  ) 
  |       exprtk_define_unary_op(log10) 
  |       exprtk_define_unary_op(log2 ) 
  |       exprtk_define_unary_op(log1p) 
  |       exprtk_define_unary_op(ncdf ) 
  |       exprtk_define_unary_op(neg  ) 
  |       exprtk_define_unary_op(notl ) 
  |       exprtk_define_unary_op(pos  ) 
  |       exprtk_define_unary_op(r2d  ) 
  |       exprtk_define_unary_op(round) 
  |       exprtk_define_unary_op(sec  ) 
  |       exprtk_define_unary_op(sgn  ) 
  |       exprtk_define_unary_op(sin  ) 
  |       exprtk_define_unary_op(sinc ) 
  |       exprtk_define_unary_op(sinh ) 
  |       exprtk_define_unary_op(sqrt ) 
  |       exprtk_define_unary_op(tan  ) 
  |       exprtk_define_unary_op(tanh ) 
  |       exprtk_define_unary_op(trunc) 
  |       #undef exprtk_define_unary_op 
  |  
  |       template <typename T> 
  |       struct opr_base 
  |       { 
  |          typedef typename details::functor_t<T>::Type    Type; 
  |          typedef typename details::functor_t<T>::RefType RefType; 
  |          typedef typename details::functor_t<T> functor_t; 
  |          typedef typename functor_t::qfunc_t    quaternary_functor_t; 
  |          typedef typename functor_t::tfunc_t    trinary_functor_t; 
  |          typedef typename functor_t::bfunc_t    binary_functor_t; 
  |          typedef typename functor_t::ufunc_t    unary_functor_t; 
  |       }; 
  |  
  |       template <typename T> 
  |       struct add_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type    Type; 
  |          typedef typename opr_base<T>::RefType RefType; 
  |  
  |          static inline T process(Type t1, Type t2) { return t1 + t2; } 
  |          static inline T process(Type t1, Type t2, Type t3) { return t1 + t2 + t3; } 
  |          static inline void assign(RefType t1, Type t2) { t1 += t2; } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_add; } 
  |          static inline details::operator_type operation() { return details::e_add; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct mul_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type    Type; 
  |          typedef typename opr_base<T>::RefType RefType; 
  |  
  |          static inline T process(Type t1, Type t2) { return t1 * t2; } 
  |          static inline T process(Type t1, Type t2, Type t3) { return t1 * t2 * t3; } 
  |          static inline void assign(RefType t1, Type t2) { t1 *= t2; } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_mul; } 
  |          static inline details::operator_type operation() { return details::e_mul; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct sub_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type    Type; 
  |          typedef typename opr_base<T>::RefType RefType; 
  |  
  |          static inline T process(Type t1, Type t2) { return t1 - t2; } 
  |          static inline T process(Type t1, Type t2, Type t3) { return t1 - t2 - t3; } 
  |          static inline void assign(RefType t1, Type t2) { t1 -= t2; } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_sub; } 
  |          static inline details::operator_type operation() { return details::e_sub; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct div_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type    Type; 
  |          typedef typename opr_base<T>::RefType RefType; 
  |  
  |          static inline T process(Type t1, Type t2) { return t1 / t2; } 
  |          static inline T process(Type t1, Type t2, Type t3) { return t1 / t2 / t3; } 
  |          static inline void assign(RefType t1, Type t2) { t1 /= t2; } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_div; } 
  |          static inline details::operator_type operation() { return details::e_div; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct mod_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type    Type; 
  |          typedef typename opr_base<T>::RefType RefType; 
  |  
  |          static inline T process(Type t1, Type t2) { return numeric::modulus<T>(t1,t2); } 
  |          static inline void assign(RefType t1, Type t2) { t1 = numeric::modulus<T>(t1,t2); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_mod; } 
  |          static inline details::operator_type operation() { return details::e_mod; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct pow_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type    Type; 
  |          typedef typename opr_base<T>::RefType RefType; 
  |  
  |          static inline T process(Type t1, Type t2) { return numeric::pow<T>(t1,t2); } 
  |          static inline void assign(RefType t1, Type t2) { t1 = numeric::pow<T>(t1,t2); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_pow; } 
  |          static inline details::operator_type operation() { return details::e_pow; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct lt_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          static inline T process(Type t1, Type t2) { return ((t1 < t2) ? T(1) : T(0)); } 
  |          static inline T process(const std::string& t1, const std::string& t2) { return ((t1 < t2) ? T(1) : T(0)); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_lt; } 
  |          static inline details::operator_type operation() { return details::e_lt; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct lte_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          static inline T process(Type t1, Type t2) { return ((t1 <= t2) ? T(1) : T(0)); } 
  |          static inline T process(const std::string& t1, const std::string& t2) { return ((t1 <= t2) ? T(1) : T(0)); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_lte; } 
  |          static inline details::operator_type operation() { return details::e_lte; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct gt_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          static inline T process(Type t1, Type t2) { return ((t1 > t2) ? T(1) : T(0)); } 
  |          static inline T process(const std::string& t1, const std::string& t2) { return ((t1 > t2) ? T(1) : T(0)); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_gt; } 
  |          static inline details::operator_type operation() { return details::e_gt; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct gte_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          static inline T process(Type t1, Type t2) { return ((t1 >= t2) ? T(1) : T(0)); } 
  |          static inline T process(const std::string& t1, const std::string& t2) { return ((t1 >= t2) ? T(1) : T(0)); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_gte; } 
  |          static inline details::operator_type operation() { return details::e_gte; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct eq_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |          static inline T process(Type t1, Type t2) { return (std::equal_to<T>()(t1,t2) ? T(1) : T(0)); } 
  |          static inline T process(const std::string& t1, const std::string& t2) { return ((t1 == t2) ? T(1) : T(0)); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_eq; } 
  |          static inline details::operator_type operation() { return details::e_eq; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct equal_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          static inline T process(Type t1, Type t2) { return numeric::equal(t1,t2); } 
  |          static inline T process(const std::string& t1, const std::string& t2) { return ((t1 == t2) ? T(1) : T(0)); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_eq; } 
  |          static inline details::operator_type operation() { return details::e_equal; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct ne_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          static inline T process(Type t1, Type t2) { return (std::not_equal_to<T>()(t1,t2) ? T(1) : T(0)); } 
  |          static inline T process(const std::string& t1, const std::string& t2) { return ((t1 != t2) ? T(1) : T(0)); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_ne; } 
  |          static inline details::operator_type operation() { return details::e_ne; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct and_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          static inline T process(Type t1, Type t2) { return (details::is_true(t1) && details::is_true(t2)) ? T(1) : T(0); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_and; } 
  |          static inline details::operator_type operation() { return details::e_and; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct nand_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          static inline T process(Type t1, Type t2) { return (details::is_true(t1) && details::is_true(t2)) ? T(0) : T(1); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_nand; } 
  |          static inline details::operator_type operation() { return details::e_nand; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct or_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          static inline T process(Type t1, Type t2) { return (details::is_true(t1) || details::is_true(t2)) ? T(1) : T(0); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_or; } 
  |          static inline details::operator_type operation() { return details::e_or; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct nor_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          static inline T process(Type t1, Type t2) { return (details::is_true(t1) || details::is_true(t2)) ? T(0) : T(1); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_nor; } 
  |          static inline details::operator_type operation() { return details::e_nor; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct xor_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          static inline T process(Type t1, Type t2) { return numeric::xor_opr<T>(t1,t2); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_nor; } 
  |          static inline details::operator_type operation() { return details::e_xor; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct xnor_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          static inline T process(Type t1, Type t2) { return numeric::xnor_opr<T>(t1,t2); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_nor; } 
  |          static inline details::operator_type operation() { return details::e_xnor; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct in_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          static inline T process(const T&, const T&) { return std::numeric_limits<T>::quiet_NaN(); } 
  |          static inline T process(const std::string& t1, const std::string& t2) { return ((std::string::npos != t2.find(t1)) ? T(1) : T(0)); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_in; } 
  |          static inline details::operator_type operation() { return details::e_in; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct like_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          static inline T process(const T&, const T&) { return std::numeric_limits<T>::quiet_NaN(); } 
  |          static inline T process(const std::string& t1, const std::string& t2) { return (details::wc_match(t2,t1) ? T(1) : T(0)); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_like; } 
  |          static inline details::operator_type operation() { return details::e_like; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct ilike_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          static inline T process(const T&, const T&) { return std::numeric_limits<T>::quiet_NaN(); } 
  |          static inline T process(const std::string& t1, const std::string& t2) { return (details::wc_imatch(t2,t1) ? T(1) : T(0)); } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_ilike; } 
  |          static inline details::operator_type operation() { return details::e_ilike; } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct inrange_op : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          static inline T process(const T& t0, const T& t1, const T& t2) { return ((t0 <= t1) && (t1 <= t2)) ? T(1) : T(0); } 
  |          static inline T process(const std::string& t0, const std::string& t1, const std::string& t2) 
  |          { 
  |             return ((t0 <= t1) && (t1 <= t2)) ? T(1) : T(0); 
  |          } 
  |          static inline typename expression_node<T>::node_type type() { return expression_node<T>::e_inranges; } 
  |          static inline details::operator_type operation() { return details::e_inrange; } 
  |       }; 
  |  
  |       template <typename T> 
  |       inline T value(details::expression_node<T>* n) 
  |       { 
  |          return n->value(); 
  |       } 
  |  
  |       template <typename T> 
  |       inline T value(std::pair<details::expression_node<T>*,bool> n) 
  |       { 
  |          return n.first->value(); 
  |       } 
  |  
  |       template <typename T> 
  |       inline T value(const T* t) 
  |       { 
  |          return (*t); 
  |       } 
  |  
  |       template <typename T> 
  |       inline T value(const T& t) 
  |       { 
  |          return t; 
  |       } 
  |  
  |       template <typename T> 
  |       struct vararg_add_op exprtk_final : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          template <typename Type, 
  |                    typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          static inline T process(const Sequence<Type,Allocator>& arg_list) 
  |          { 
  |             switch (arg_list.size()) 
  |             { 
  |                case 0  : return T(0); 
  |                case 1  : return process_1(arg_list); 
  |                case 2  : return process_2(arg_list); 
  |                case 3  : return process_3(arg_list); 
  |                case 4  : return process_4(arg_list); 
  |                case 5  : return process_5(arg_list); 
  |                default : 
  |                          { 
  |                             T result = T(0); 
  |  
  |                             for (std::size_t i = 0; i < arg_list.size(); ++i) 
  |                             { 
  |                                result += value(arg_list[i]); 
  |                             } 
  |  
  |                             return result; 
  |                          } 
  |             } 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_1(const Sequence& arg_list) 
  |          { 
  |             return value(arg_list[0]); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_2(const Sequence& arg_list) 
  |          { 
  |             return value(arg_list[0]) + value(arg_list[1]); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_3(const Sequence& arg_list) 
  |          { 
  |             return value(arg_list[0]) + value(arg_list[1]) + 
  |                    value(arg_list[2]) ; 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_4(const Sequence& arg_list) 
  |          { 
  |             return value(arg_list[0]) + value(arg_list[1]) + 
  |                    value(arg_list[2]) + value(arg_list[3]) ; 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_5(const Sequence& arg_list) 
  |          { 
  |             return value(arg_list[0]) + value(arg_list[1]) + 
  |                    value(arg_list[2]) + value(arg_list[3]) + 
  |                    value(arg_list[4]) ; 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct vararg_mul_op exprtk_final : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          template <typename Type, 
  |                    typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          static inline T process(const Sequence<Type,Allocator>& arg_list) 
  |          { 
  |             switch (arg_list.size()) 
  |             { 
  |                case 0  : return T(0); 
  |                case 1  : return process_1(arg_list); 
  |                case 2  : return process_2(arg_list); 
  |                case 3  : return process_3(arg_list); 
  |                case 4  : return process_4(arg_list); 
  |                case 5  : return process_5(arg_list); 
  |                default : 
  |                          { 
  |                             T result = T(value(arg_list[0])); 
  |  
  |                             for (std::size_t i = 1; i < arg_list.size(); ++i) 
  |                             { 
  |                                result *= value(arg_list[i]); 
  |                             } 
  |  
  |                             return result; 
  |                          } 
  |             } 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_1(const Sequence& arg_list) 
  |          { 
  |             return value(arg_list[0]); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_2(const Sequence& arg_list) 
  |          { 
  |             return value(arg_list[0]) * value(arg_list[1]); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_3(const Sequence& arg_list) 
  |          { 
  |             return value(arg_list[0]) * value(arg_list[1]) * 
  |                    value(arg_list[2]) ; 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_4(const Sequence& arg_list) 
  |          { 
  |             return value(arg_list[0]) * value(arg_list[1]) * 
  |                    value(arg_list[2]) * value(arg_list[3]) ; 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_5(const Sequence& arg_list) 
  |          { 
  |             return value(arg_list[0]) * value(arg_list[1]) * 
  |                    value(arg_list[2]) * value(arg_list[3]) * 
  |                    value(arg_list[4]) ; 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct vararg_avg_op exprtk_final : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          template <typename Type, 
  |                    typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          static inline T process(const Sequence<Type,Allocator>& arg_list) 
  |          { 
  |             switch (arg_list.size()) 
  |             { 
  |                case 0  : return T(0); 
  |                case 1  : return process_1(arg_list); 
  |                case 2  : return process_2(arg_list); 
  |                case 3  : return process_3(arg_list); 
  |                case 4  : return process_4(arg_list); 
  |                case 5  : return process_5(arg_list); 
  |                default : return vararg_add_op<T>::process(arg_list) / T(arg_list.size()); 
  |             } 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_1(const Sequence& arg_list) 
  |          { 
  |             return value(arg_list[0]); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_2(const Sequence& arg_list) 
  |          { 
  |             return (value(arg_list[0]) + value(arg_list[1])) / T(2); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_3(const Sequence& arg_list) 
  |          { 
  |             return (value(arg_list[0]) + value(arg_list[1]) + value(arg_list[2])) / T(3); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_4(const Sequence& arg_list) 
  |          { 
  |             return (value(arg_list[0]) + value(arg_list[1]) + 
  |                     value(arg_list[2]) + value(arg_list[3])) / T(4); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_5(const Sequence& arg_list) 
  |          { 
  |             return (value(arg_list[0]) + value(arg_list[1]) + 
  |                     value(arg_list[2]) + value(arg_list[3]) + 
  |                     value(arg_list[4])) / T(5); 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct vararg_min_op exprtk_final : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          template <typename Type, 
  |                    typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          static inline T process(const Sequence<Type,Allocator>& arg_list) 
  |          { 
  |             switch (arg_list.size()) 
  |             { 
  |                case 0  : return T(0); 
  |                case 1  : return process_1(arg_list); 
  |                case 2  : return process_2(arg_list); 
  |                case 3  : return process_3(arg_list); 
  |                case 4  : return process_4(arg_list); 
  |                case 5  : return process_5(arg_list); 
  |                default : 
  |                          { 
  |                             T result = T(value(arg_list[0])); 
  |  
  |                             for (std::size_t i = 1; i < arg_list.size(); ++i) 
  |                             { 
  |                                const T v = value(arg_list[i]); 
  |  
  |                                if (v < result) 
  |                                   result = v; 
  |                             } 
  |  
  |                             return result; 
  |                          } 
  |             } 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_1(const Sequence& arg_list) 
  |          { 
  |             return value(arg_list[0]); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_2(const Sequence& arg_list) 
  |          { 
  |             return std::min<T>(value(arg_list[0]),value(arg_list[1])); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_3(const Sequence& arg_list) 
  |          { 
  |             return std::min<T>(std::min<T>(value(arg_list[0]),value(arg_list[1])),value(arg_list[2])); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_4(const Sequence& arg_list) 
  |          { 
  |             return std::min<T>( 
  |                         std::min<T>(value(arg_list[0]), value(arg_list[1])), 
  |                         std::min<T>(value(arg_list[2]), value(arg_list[3]))); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_5(const Sequence& arg_list) 
  |          { 
  |             return std::min<T>( 
  |                    std::min<T>(std::min<T>(value(arg_list[0]), value(arg_list[1])), 
  |                                std::min<T>(value(arg_list[2]), value(arg_list[3]))), 
  |                                value(arg_list[4])); 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct vararg_max_op exprtk_final : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          template <typename Type, 
  |                    typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          static inline T process(const Sequence<Type,Allocator>& arg_list) 
  |          { 
  |             switch (arg_list.size()) 
  |             { 
  |                case 0  : return T(0); 
  |                case 1  : return process_1(arg_list); 
  |                case 2  : return process_2(arg_list); 
  |                case 3  : return process_3(arg_list); 
  |                case 4  : return process_4(arg_list); 
  |                case 5  : return process_5(arg_list); 
  |                default : 
  |                          { 
  |                             T result = T(value(arg_list[0])); 
  |  
  |                             for (std::size_t i = 1; i < arg_list.size(); ++i) 
  |                             { 
  |                                const T v = value(arg_list[i]); 
  |  
  |                                if (v > result) 
  |                                   result = v; 
  |                             } 
  |  
  |                             return result; 
  |                          } 
  |             } 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_1(const Sequence& arg_list) 
  |          { 
  |             return value(arg_list[0]); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_2(const Sequence& arg_list) 
  |          { 
  |             return std::max<T>(value(arg_list[0]),value(arg_list[1])); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_3(const Sequence& arg_list) 
  |          { 
  |             return std::max<T>(std::max<T>(value(arg_list[0]),value(arg_list[1])),value(arg_list[2])); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_4(const Sequence& arg_list) 
  |          { 
  |             return std::max<T>( 
  |                         std::max<T>(value(arg_list[0]), value(arg_list[1])), 
  |                         std::max<T>(value(arg_list[2]), value(arg_list[3]))); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_5(const Sequence& arg_list) 
  |          { 
  |             return std::max<T>( 
  |                    std::max<T>(std::max<T>(value(arg_list[0]), value(arg_list[1])), 
  |                                std::max<T>(value(arg_list[2]), value(arg_list[3]))), 
  |                                value(arg_list[4])); 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct vararg_mand_op exprtk_final : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          template <typename Type, 
  |                    typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          static inline T process(const Sequence<Type,Allocator>& arg_list) 
  |          { 
  |             switch (arg_list.size()) 
  |             { 
  |                case 1  : return process_1(arg_list); 
  |                case 2  : return process_2(arg_list); 
  |                case 3  : return process_3(arg_list); 
  |                case 4  : return process_4(arg_list); 
  |                case 5  : return process_5(arg_list); 
  |                default : 
  |                          { 
  |                             for (std::size_t i = 0; i < arg_list.size(); ++i) 
  |                             { 
  |                                if (std::equal_to<T>()(T(0), value(arg_list[i]))) 
  |                                   return T(0); 
  |                             } 
  |  
  |                             return T(1); 
  |                          } 
  |             } 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_1(const Sequence& arg_list) 
  |          { 
  |             return std::not_equal_to<T>() 
  |                       (T(0), value(arg_list[0])) ? T(1) : T(0); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_2(const Sequence& arg_list) 
  |          { 
  |             return ( 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[0])) && 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[1])) 
  |                    ) ? T(1) : T(0); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_3(const Sequence& arg_list) 
  |          { 
  |             return ( 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[0])) && 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[1])) && 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[2])) 
  |                    ) ? T(1) : T(0); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_4(const Sequence& arg_list) 
  |          { 
  |             return ( 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[0])) && 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[1])) && 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[2])) && 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[3])) 
  |                    ) ? T(1) : T(0); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_5(const Sequence& arg_list) 
  |          { 
  |             return ( 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[0])) && 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[1])) && 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[2])) && 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[3])) && 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[4])) 
  |                    ) ? T(1) : T(0); 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct vararg_mor_op exprtk_final : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          template <typename Type, 
  |                    typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          static inline T process(const Sequence<Type,Allocator>& arg_list) 
  |          { 
  |             switch (arg_list.size()) 
  |             { 
  |                case 1  : return process_1(arg_list); 
  |                case 2  : return process_2(arg_list); 
  |                case 3  : return process_3(arg_list); 
  |                case 4  : return process_4(arg_list); 
  |                case 5  : return process_5(arg_list); 
  |                default : 
  |                          { 
  |                             for (std::size_t i = 0; i < arg_list.size(); ++i) 
  |                             { 
  |                                if (std::not_equal_to<T>()(T(0), value(arg_list[i]))) 
  |                                   return T(1); 
  |                             } 
  |  
  |                             return T(0); 
  |                          } 
  |             } 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_1(const Sequence& arg_list) 
  |          { 
  |             return std::not_equal_to<T>() 
  |                       (T(0), value(arg_list[0])) ? T(1) : T(0); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_2(const Sequence& arg_list) 
  |          { 
  |             return ( 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[0])) || 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[1])) 
  |                    ) ? T(1) : T(0); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_3(const Sequence& arg_list) 
  |          { 
  |             return ( 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[0])) || 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[1])) || 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[2])) 
  |                    ) ? T(1) : T(0); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_4(const Sequence& arg_list) 
  |          { 
  |             return ( 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[0])) || 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[1])) || 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[2])) || 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[3])) 
  |                    ) ? T(1) : T(0); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_5(const Sequence& arg_list) 
  |          { 
  |             return ( 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[0])) || 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[1])) || 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[2])) || 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[3])) || 
  |                      std::not_equal_to<T>()(T(0), value(arg_list[4])) 
  |                    ) ? T(1) : T(0); 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct vararg_multi_op exprtk_final : public opr_base<T> 
  |       { 
  |          typedef typename opr_base<T>::Type Type; 
  |  
  |          template <typename Type, 
  |                    typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          static inline T process(const Sequence<Type,Allocator>& arg_list) 
  |          { 
  |             switch (arg_list.size()) 
  |             { 
  |                case 0  : return std::numeric_limits<T>::quiet_NaN(); 
  |                case 1  : return process_1(arg_list); 
  |                case 2  : return process_2(arg_list); 
  |                case 3  : return process_3(arg_list); 
  |                case 4  : return process_4(arg_list); 
  |                case 5  : return process_5(arg_list); 
  |                case 6  : return process_6(arg_list); 
  |                case 7  : return process_7(arg_list); 
  |                case 8  : return process_8(arg_list); 
  |                default : 
  |                         { 
  |                            for (std::size_t i = 0; i < (arg_list.size() - 1); ++i) 
  |                            { 
  |                               value(arg_list[i]); 
  |                            } 
  |                            return value(arg_list.back()); 
  |                         } 
  |             } 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_1(const Sequence& arg_list) 
  |          { 
  |             return value(arg_list[0]); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_2(const Sequence& arg_list) 
  |          { 
  |                    value(arg_list[0]); 
  |             return value(arg_list[1]); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_3(const Sequence& arg_list) 
  |          { 
  |                    value(arg_list[0]); 
  |                    value(arg_list[1]); 
  |             return value(arg_list[2]); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_4(const Sequence& arg_list) 
  |          { 
  |                    value(arg_list[0]); 
  |                    value(arg_list[1]); 
  |                    value(arg_list[2]); 
  |             return value(arg_list[3]); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_5(const Sequence& arg_list) 
  |          { 
  |                    value(arg_list[0]); 
  |                    value(arg_list[1]); 
  |                    value(arg_list[2]); 
  |                    value(arg_list[3]); 
  |             return value(arg_list[4]); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_6(const Sequence& arg_list) 
  |          { 
  |                    value(arg_list[0]); 
  |                    value(arg_list[1]); 
  |                    value(arg_list[2]); 
  |                    value(arg_list[3]); 
  |                    value(arg_list[4]); 
  |             return value(arg_list[5]); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_7(const Sequence& arg_list) 
  |          { 
  |                    value(arg_list[0]); 
  |                    value(arg_list[1]); 
  |                    value(arg_list[2]); 
  |                    value(arg_list[3]); 
  |                    value(arg_list[4]); 
  |                    value(arg_list[5]); 
  |             return value(arg_list[6]); 
  |          } 
  |  
  |          template <typename Sequence> 
  |          static inline T process_8(const Sequence& arg_list) 
  |          { 
  |                    value(arg_list[0]); 
  |                    value(arg_list[1]); 
  |                    value(arg_list[2]); 
  |                    value(arg_list[3]); 
  |                    value(arg_list[4]); 
  |                    value(arg_list[5]); 
  |                    value(arg_list[6]); 
  |             return value(arg_list[7]); 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct vec_add_op 
  |       { 
  |          typedef vector_interface<T>* ivector_ptr; 
  |  
  |          static inline T process(const ivector_ptr v) 
  |          { 
  |             const T* vec = v->vec()->vds().data(); 
  |             const std::size_t vec_size = v->size(); 
  |  
  |             loop_unroll::details lud(vec_size); 
  |  
  |             if (vec_size <= static_cast<std::size_t>(lud.batch_size)) 
  |             { 
  |                T result = T(0); 
  |                int i    = 0; 
  |  
  |                switch (vec_size) 
  |                { 
  |                   #define case_stmt(N,fall_through) \ 
  |                   case N : result += vec[i++];      \ 
  |                   fall_through                      \ 
  |  
  |                   #ifndef exprtk_disable_superscalar_unroll 
  |                   case_stmt(16, exprtk_fallthrough) case_stmt(15, exprtk_fallthrough) 
  |                   case_stmt(14, exprtk_fallthrough) case_stmt(13, exprtk_fallthrough) 
  |                   case_stmt(12, exprtk_fallthrough) case_stmt(11, exprtk_fallthrough) 
  |                   case_stmt(10, exprtk_fallthrough) case_stmt( 9, exprtk_fallthrough) 
  |                   case_stmt( 8, exprtk_fallthrough) case_stmt( 7, exprtk_fallthrough) 
  |                   case_stmt( 6, exprtk_fallthrough) case_stmt( 5, exprtk_fallthrough) 
  |  
  |                   #endif 
  |                   case_stmt( 4, exprtk_fallthrough) case_stmt( 3, exprtk_fallthrough) 
  |                   case_stmt( 2, exprtk_fallthrough) case_stmt( 1, (void)0;) 
  |                } 
  |  
  |                #undef case_stmt 
  |  
  |                return result; 
  |             } 
  |  
  |             T r[] = { 
  |                       T(0), T(0), T(0), T(0), T(0), T(0), T(0), T(0), 
  |                       T(0), T(0), T(0), T(0), T(0), T(0), T(0), T(0) 
  |                     }; 
  |  
  |             const T* upper_bound = vec + lud.upper_bound; 
  |  
  |             while (vec < upper_bound) 
  |             { 
  |                #define exprtk_loop(N) \ 
  |                r[N] += vec[N];        \ 
  |  
  |                exprtk_loop( 0) exprtk_loop( 1) 
  |                exprtk_loop( 2) exprtk_loop( 3) 
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                exprtk_loop( 4) exprtk_loop( 5) 
  |                exprtk_loop( 6) exprtk_loop( 7) 
  |                exprtk_loop( 8) exprtk_loop( 9) 
  |                exprtk_loop(10) exprtk_loop(11) 
  |                exprtk_loop(12) exprtk_loop(13) 
  |                exprtk_loop(14) exprtk_loop(15) 
  |                #endif 
  |  
  |                vec += lud.batch_size; 
  |             } 
  |  
  |             int i = 0; 
  |  
  |             switch (lud.remainder) 
  |             { 
  |                #define case_stmt(N,fall_through) \ 
  |                case N : r[0] += vec[i++];        \ 
  |                fall_through                      \ 
  |  
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                case_stmt(15, exprtk_fallthrough) case_stmt(14, exprtk_fallthrough) 
  |                case_stmt(13, exprtk_fallthrough) case_stmt(12, exprtk_fallthrough) 
  |                case_stmt(11, exprtk_fallthrough) case_stmt(10, exprtk_fallthrough) 
  |                case_stmt( 9, exprtk_fallthrough) case_stmt( 8, exprtk_fallthrough) 
  |                case_stmt( 7, exprtk_fallthrough) case_stmt( 6, exprtk_fallthrough) 
  |                case_stmt( 5, exprtk_fallthrough) case_stmt( 4, exprtk_fallthrough) 
  |                #endif 
  |                case_stmt( 3, exprtk_fallthrough) case_stmt( 2, exprtk_fallthrough) 
  |                case_stmt( 1, (void)0;) 
  |             } 
  |  
  |             #undef exprtk_loop 
  |             #undef case_stmt 
  |  
  |             return (r[ 0] + r[ 1] + r[ 2] + r[ 3]) 
  |                    #ifndef exprtk_disable_superscalar_unroll 
  |                  + (r[ 4] + r[ 5] + r[ 6] + r[ 7]) 
  |                  + (r[ 8] + r[ 9] + r[10] + r[11]) 
  |                  + (r[12] + r[13] + r[14] + r[15]) 
  |                    #endif 
  |                    ; 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct vec_mul_op 
  |       { 
  |          typedef vector_interface<T>* ivector_ptr; 
  |  
  |          static inline T process(const ivector_ptr v) 
  |          { 
  |             const T* vec = v->vec()->vds().data(); 
  |             const std::size_t vec_size = v->vec()->size(); 
  |  
  |             loop_unroll::details lud(vec_size); 
  |  
  |             if (vec_size <= static_cast<std::size_t>(lud.batch_size)) 
  |             { 
  |                T result = T(1); 
  |                int i    = 0; 
  |  
  |                switch (vec_size) 
  |                { 
  |                   #define case_stmt(N,fall_through) \ 
  |                   case N : result *= vec[i++];      \ 
  |                   fall_through                      \ 
  |  
  |                   #ifndef exprtk_disable_superscalar_unroll 
  |                   case_stmt(16, exprtk_fallthrough) case_stmt(15, exprtk_fallthrough) 
  |                   case_stmt(14, exprtk_fallthrough) case_stmt(13, exprtk_fallthrough) 
  |                   case_stmt(12, exprtk_fallthrough) case_stmt(11, exprtk_fallthrough) 
  |                   case_stmt(10, exprtk_fallthrough) case_stmt( 9, exprtk_fallthrough) 
  |                   case_stmt( 8, exprtk_fallthrough) case_stmt( 7, exprtk_fallthrough) 
  |                   case_stmt( 6, exprtk_fallthrough) case_stmt( 5, exprtk_fallthrough) 
  |                   #endif 
  |                   case_stmt( 4, exprtk_fallthrough) case_stmt( 3, exprtk_fallthrough) 
  |                   case_stmt( 2, exprtk_fallthrough) case_stmt( 1, (void)0;) 
  |                } 
  |  
  |                #undef case_stmt 
  |  
  |                return result; 
  |             } 
  |  
  |             T r[] = { 
  |                       T(1), T(1), T(1), T(1), T(1), T(1), T(1), T(1), 
  |                       T(1), T(1), T(1), T(1), T(1), T(1), T(1), T(1) 
  |                     }; 
  |  
  |             const T* upper_bound = vec + lud.upper_bound; 
  |  
  |             while (vec < upper_bound) 
  |             { 
  |                #define exprtk_loop(N) \ 
  |                r[N] *= vec[N];        \ 
  |  
  |                exprtk_loop( 0) exprtk_loop( 1) 
  |                exprtk_loop( 2) exprtk_loop( 3) 
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                exprtk_loop( 4) exprtk_loop( 5) 
  |                exprtk_loop( 6) exprtk_loop( 7) 
  |                exprtk_loop( 8) exprtk_loop( 9) 
  |                exprtk_loop(10) exprtk_loop(11) 
  |                exprtk_loop(12) exprtk_loop(13) 
  |                exprtk_loop(14) exprtk_loop(15) 
  |                #endif 
  |  
  |                vec += lud.batch_size; 
  |             } 
  |  
  |             int i = 0; 
  |  
  |             switch (lud.remainder) 
  |             { 
  |                #define case_stmt(N,fall_through) \ 
  |                case N : r[0] *= vec[i++];        \ 
  |                fall_through                      \ 
  |  
  |                #ifndef exprtk_disable_superscalar_unroll 
  |                case_stmt(15, exprtk_fallthrough) case_stmt(14, exprtk_fallthrough) 
  |                case_stmt(13, exprtk_fallthrough) case_stmt(12, exprtk_fallthrough) 
  |                case_stmt(11, exprtk_fallthrough) case_stmt(10, exprtk_fallthrough) 
  |                case_stmt( 9, exprtk_fallthrough) case_stmt( 8, exprtk_fallthrough) 
  |                case_stmt( 7, exprtk_fallthrough) case_stmt( 6, exprtk_fallthrough) 
  |                case_stmt( 5, exprtk_fallthrough) case_stmt( 4, exprtk_fallthrough) 
  |                #endif 
  |                case_stmt( 3, exprtk_fallthrough) case_stmt( 2, exprtk_fallthrough) 
  |                case_stmt( 1, (void)0;) 
  |             } 
  |  
  |             #undef exprtk_loop 
  |             #undef case_stmt 
  |  
  |             return (r[ 0] * r[ 1] * r[ 2] * r[ 3]) 
  |                    #ifndef exprtk_disable_superscalar_unroll 
  |                  * (r[ 4] * r[ 5] * r[ 6] * r[ 7]) 
  |                  * (r[ 8] * r[ 9] * r[10] * r[11]) 
  |                  * (r[12] * r[13] * r[14] * r[15]) 
  |                    #endif 
  |                    ; 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct vec_avg_op 
  |       { 
  |          typedef vector_interface<T>* ivector_ptr; 
  |  
  |          static inline T process(const ivector_ptr v) 
  |          { 
  |             const T vec_size = T(v->vec()->size()); 
  |             return vec_add_op<T>::process(v) / vec_size; 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct vec_min_op 
  |       { 
  |          typedef vector_interface<T>* ivector_ptr; 
  |  
  |          static inline T process(const ivector_ptr v) 
  |          { 
  |             const T* vec = v->vec()->vds().data(); 
  |             const std::size_t vec_size = v->vec()->size(); 
  |  
  |             T result = vec[0]; 
  |  
  |             for (std::size_t i = 1; i < vec_size; ++i) 
  |             { 
  |                const T v_i = vec[i]; 
  |  
  |                if (v_i < result) 
  |                   result = v_i; 
  |             } 
  |  
  |             return result; 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       struct vec_max_op 
  |       { 
  |          typedef vector_interface<T>* ivector_ptr; 
  |  
  |          static inline T process(const ivector_ptr v) 
  |          { 
  |             const T* vec = v->vec()->vds().data(); 
  |             const std::size_t vec_size = v->vec()->size(); 
  |  
  |             T result = vec[0]; 
  |  
  |             for (std::size_t i = 1; i < vec_size; ++i) 
  |             { 
  |                const T v_i = vec[i]; 
  |  
  |                if (v_i > result) 
  |                   result = v_i; 
  |             } 
  |  
  |             return result; 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       class vov_base_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          virtual ~vov_base_node() 
  |          {} 
  |  
  |          inline virtual operator_type operation() const 
  |          { 
  |             return details::e_default; 
  |          } 
  |  
  |          virtual const T& v0() const = 0; 
  |  
  |          virtual const T& v1() const = 0; 
  |       }; 
  |  
  |       template <typename T> 
  |       class cov_base_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          virtual ~cov_base_node() 
  |          {} 
  |  
  |          inline virtual operator_type operation() const 
  |          { 
  |             return details::e_default; 
  |          } 
  |  
  |          virtual const T c() const = 0; 
  |  
  |          virtual const T& v() const = 0; 
  |       }; 
  |  
  |       template <typename T> 
  |       class voc_base_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          virtual ~voc_base_node() 
  |          {} 
  |  
  |          inline virtual operator_type operation() const 
  |          { 
  |             return details::e_default; 
  |          } 
  |  
  |          virtual const T c() const = 0; 
  |  
  |          virtual const T& v() const = 0; 
  |       }; 
  |  
  |       template <typename T> 
  |       class vob_base_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          virtual ~vob_base_node() 
  |          {} 
  |  
  |          virtual const T& v() const = 0; 
  |       }; 
  |  
  |       template <typename T> 
  |       class bov_base_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          virtual ~bov_base_node() 
  |          {} 
  |  
  |          virtual const T& v() const = 0; 
  |       }; 
  |  
  |       template <typename T> 
  |       class cob_base_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          virtual ~cob_base_node() 
  |          {} 
  |  
  |          inline virtual operator_type operation() const 
  |          { 
  |             return details::e_default; 
  |          } 
  |  
  |          virtual const T c() const = 0; 
  |  
  |          virtual void set_c(const T) = 0; 
  |  
  |          virtual expression_node<T>* move_branch(const std::size_t& index) = 0; 
  |       }; 
  |  
  |       template <typename T> 
  |       class boc_base_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          virtual ~boc_base_node() 
  |          {} 
  |  
  |          inline virtual operator_type operation() const 
  |          { 
  |             return details::e_default; 
  |          } 
  |  
  |          virtual const T c() const = 0; 
  |  
  |          virtual void set_c(const T) = 0; 
  |  
  |          virtual expression_node<T>* move_branch(const std::size_t& index) = 0; 
  |       }; 
  |  
  |       template <typename T> 
  |       class uv_base_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          virtual ~uv_base_node() 
  |          {} 
  |  
  |          inline virtual operator_type operation() const 
  |          { 
  |             return details::e_default; 
  |          } 
  |  
  |          virtual const T& v() const = 0; 
  |       }; 
  |  
  |       template <typename T> 
  |       class sos_base_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          virtual ~sos_base_node() 
  |          {} 
  |  
  |          inline virtual operator_type operation() const 
  |          { 
  |             return details::e_default; 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       class sosos_base_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          virtual ~sosos_base_node() 
  |          {} 
  |  
  |          inline virtual operator_type operation() const 
  |          { 
  |             return details::e_default; 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       class T0oT1oT2_base_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          virtual ~T0oT1oT2_base_node() 
  |          {} 
  |  
  |          virtual std::string type_id() const = 0; 
  |       }; 
  |  
  |       template <typename T> 
  |       class T0oT1oT2oT3_base_node : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          virtual ~T0oT1oT2oT3_base_node() 
  |          {} 
  |  
  |          virtual std::string type_id() const = 0; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class unary_variable_node exprtk_final : public uv_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef Operation operation_t; 
  |  
  |          explicit unary_variable_node(const T& var) 
  |          : v_(var) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return Operation::process(v_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return Operation::type(); 
  |          } 
  |  
  |          inline operator_type operation() const exprtk_override 
  |          { 
  |             return Operation::operation(); 
  |          } 
  |  
  |          inline const T& v() const exprtk_override 
  |          { 
  |             return v_; 
  |          } 
  |  
  |       private: 
  |  
  |          unary_variable_node(const unary_variable_node<T,Operation>&) exprtk_delete; 
  |          unary_variable_node<T,Operation>& operator=(const unary_variable_node<T,Operation>&) exprtk_delete; 
  |  
  |          const T& v_; 
  |       }; 
  |  
  |       template <typename T> 
  |       class uvouv_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          // UOpr1(v0) Op UOpr2(v1) 
  |          typedef typename details::functor_t<T> functor_t; 
  |          typedef typename functor_t::bfunc_t    bfunc_t; 
  |          typedef typename functor_t::ufunc_t    ufunc_t; 
  |          typedef expression_node<T>*            expression_ptr; 
  |  
  |          explicit uvouv_node(const T& var0,const T& var1, 
  |                              ufunc_t uf0, ufunc_t uf1, bfunc_t bf) 
  |          : v0_(var0) 
  |          , v1_(var1) 
  |          , u0_(uf0 ) 
  |          , u1_(uf1 ) 
  |          , f_ (bf  ) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return f_(u0_(v0_),u1_(v1_)); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_uvouv; 
  |          } 
  |  
  |          inline const T& v0() 
  |          { 
  |             return v0_; 
  |          } 
  |  
  |          inline const T& v1() 
  |          { 
  |             return v1_; 
  |          } 
  |  
  |          inline ufunc_t u0() 
  |          { 
  |             return u0_; 
  |          } 
  |  
  |          inline ufunc_t u1() 
  |          { 
  |             return u1_; 
  |          } 
  |  
  |          inline ufunc_t f() 
  |          { 
  |             return f_; 
  |          } 
  |  
  |       private: 
  |  
  |          uvouv_node(const uvouv_node<T>&) exprtk_delete; 
  |          uvouv_node<T>& operator=(const uvouv_node<T>&) exprtk_delete; 
  |  
  |          const T& v0_; 
  |          const T& v1_; 
  |          const ufunc_t u0_; 
  |          const ufunc_t u1_; 
  |          const bfunc_t f_; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class unary_branch_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef Operation                      operation_t; 
  |          typedef expression_node<T>*            expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |  
  |          explicit unary_branch_node(expression_ptr branch) 
  |          { 
  |             construct_branch_pair(branch_, branch); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return Operation::process(branch_.first->value()); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return Operation::type(); 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return branch_.first && branch_.first->valid(); 
  |          } 
  |  
  |          inline operator_type operation() 
  |          { 
  |             return Operation::operation(); 
  |          } 
  |  
  |          inline expression_node<T>* branch(const std::size_t&) const exprtk_override 
  |          { 
  |             return branch_.first; 
  |          } 
  |  
  |          inline void release() 
  |          { 
  |             branch_.second = false; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(branch_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(branch_); 
  |          } 
  |  
  |       private: 
  |  
  |          unary_branch_node(const unary_branch_node<T,Operation>&) exprtk_delete; 
  |          unary_branch_node<T,Operation>& operator=(const unary_branch_node<T,Operation>&) exprtk_delete; 
  |  
  |          branch_t branch_; 
  |       }; 
  |  
  |       template <typename T> struct is_const                { enum {result = 0}; }; 
  |       template <typename T> struct is_const <const T>      { enum {result = 1}; }; 
  |       template <typename T> struct is_const_ref            { enum {result = 0}; }; 
  |       template <typename T> struct is_const_ref <const T&> { enum {result = 1}; }; 
  |       template <typename T> struct is_ref                  { enum {result = 0}; }; 
  |       template <typename T> struct is_ref<T&>              { enum {result = 1}; }; 
  |       template <typename T> struct is_ref<const T&>        { enum {result = 0}; }; 
  |  
  |       template <std::size_t State> 
  |       struct param_to_str { static std::string result() { static const std::string r("v"); return r; } }; 
  |  
  |       template <> 
  |       struct param_to_str<0> { static std::string result() { static const std::string r("c"); return r; } }; 
  |  
  |       #define exprtk_crtype(Type)                          \ 
  |       param_to_str<is_const_ref< Type >::result>::result() \ 
  |  
  |       template <typename T> 
  |       struct T0oT1oT2process 
  |       { 
  |          typedef typename details::functor_t<T> functor_t; 
  |          typedef typename functor_t::bfunc_t    bfunc_t; 
  |  
  |          struct mode0 
  |          { 
  |             static inline T process(const T& t0, const T& t1, const T& t2, const bfunc_t bf0, const bfunc_t bf1) 
  |             { 
  |                // (T0 o0 T1) o1 T2 
  |                return bf1(bf0(t0,t1),t2); 
  |             } 
  |  
  |             template <typename T0, typename T1, typename T2> 
  |             static inline std::string id() 
  |             { 
  |                static const std::string result = "(" + exprtk_crtype(T0) + "o"   + 
  |                                                        exprtk_crtype(T1) + ")o(" + 
  |                                                        exprtk_crtype(T2) + ")"   ; 
  |                return result; 
  |             } 
  |          }; 
  |  
  |          struct mode1 
  |          { 
  |             static inline T process(const T& t0, const T& t1, const T& t2, const bfunc_t bf0, const bfunc_t bf1) 
  |             { 
  |                // T0 o0 (T1 o1 T2) 
  |                return bf0(t0,bf1(t1,t2)); 
  |             } 
  |  
  |             template <typename T0, typename T1, typename T2> 
  |             static inline std::string id() 
  |             { 
  |                static const std::string result = "(" + exprtk_crtype(T0) + ")o(" + 
  |                                                        exprtk_crtype(T1) + "o"   + 
  |                                                        exprtk_crtype(T2) + ")"   ; 
  |                return result; 
  |             } 
  |          }; 
  |       }; 
  |  
  |       template <typename T> 
  |       struct T0oT1oT20T3process 
  |       { 
  |          typedef typename details::functor_t<T> functor_t; 
  |          typedef typename functor_t::bfunc_t    bfunc_t; 
  |  
  |          struct mode0 
  |          { 
  |             static inline T process(const T& t0, const T& t1, 
  |                                     const T& t2, const T& t3, 
  |                                     const bfunc_t bf0, const bfunc_t bf1, const bfunc_t bf2) 
  |             { 
  |                // (T0 o0 T1) o1 (T2 o2 T3) 
  |                return bf1(bf0(t0,t1),bf2(t2,t3)); 
  |             } 
  |  
  |             template <typename T0, typename T1, typename T2, typename T3> 
  |             static inline std::string id() 
  |             { 
  |                static const std::string result = "(" + exprtk_crtype(T0) + "o"  + 
  |                                                        exprtk_crtype(T1) + ")o" + 
  |                                                  "(" + exprtk_crtype(T2) + "o"  + 
  |                                                        exprtk_crtype(T3) + ")"  ; 
  |                return result; 
  |             } 
  |          }; 
  |  
  |          struct mode1 
  |          { 
  |             static inline T process(const T& t0, const T& t1, 
  |                                     const T& t2, const T& t3, 
  |                                     const bfunc_t bf0, const bfunc_t bf1, const bfunc_t bf2) 
  |             { 
  |                // (T0 o0 (T1 o1 (T2 o2 T3)) 
  |                return bf0(t0,bf1(t1,bf2(t2,t3))); 
  |             } 
  |             template <typename T0, typename T1, typename T2, typename T3> 
  |             static inline std::string id() 
  |             { 
  |                static const std::string result = "(" + exprtk_crtype(T0) +  ")o((" + 
  |                                                        exprtk_crtype(T1) +  ")o("  + 
  |                                                        exprtk_crtype(T2) +  "o"    + 
  |                                                        exprtk_crtype(T3) +  "))"   ; 
  |                return result; 
  |             } 
  |          }; 
  |  
  |          struct mode2 
  |          { 
  |             static inline T process(const T& t0, const T& t1, 
  |                                     const T& t2, const T& t3, 
  |                                     const bfunc_t bf0, const bfunc_t bf1, const bfunc_t bf2) 
  |             { 
  |                // (T0 o0 ((T1 o1 T2) o2 T3) 
  |                return bf0(t0,bf2(bf1(t1,t2),t3)); 
  |             } 
  |  
  |             template <typename T0, typename T1, typename T2, typename T3> 
  |             static inline std::string id() 
  |             { 
  |                static const std::string result = "(" + exprtk_crtype(T0) + ")o((" + 
  |                                                        exprtk_crtype(T1) + "o"    + 
  |                                                        exprtk_crtype(T2) + ")o("  + 
  |                                                        exprtk_crtype(T3) + "))"   ; 
  |                return result; 
  |             } 
  |          }; 
  |  
  |          struct mode3 
  |          { 
  |             static inline T process(const T& t0, const T& t1, 
  |                                     const T& t2, const T& t3, 
  |                                     const bfunc_t bf0, const bfunc_t bf1, const bfunc_t bf2) 
  |             { 
  |                // (((T0 o0 T1) o1 T2) o2 T3) 
  |                return bf2(bf1(bf0(t0,t1),t2),t3); 
  |             } 
  |  
  |             template <typename T0, typename T1, typename T2, typename T3> 
  |             static inline std::string id() 
  |             { 
  |                static const std::string result = "((" + exprtk_crtype(T0) + "o"    + 
  |                                                         exprtk_crtype(T1) + ")o("  + 
  |                                                         exprtk_crtype(T2) + "))o(" + 
  |                                                         exprtk_crtype(T3) + ")" 
  |                return result; 
  |             } 
  |          }; 
  |  
  |          struct mode4 
  |          { 
  |             static inline T process(const T& t0, const T& t1, 
  |                                     const T& t2, const T& t3, 
  |                                     const bfunc_t bf0, const bfunc_t bf1, const bfunc_t bf2) 
  |             { 
  |                // ((T0 o0 (T1 o1 T2)) o2 T3 
  |                return bf2(bf0(t0,bf1(t1,t2)),t3); 
  |             } 
  |  
  |             template <typename T0, typename T1, typename T2, typename T3> 
  |             static inline std::string id() 
  |             { 
  |                static const std::string result = "((" + exprtk_crtype(T0) + ")o("  + 
  |                                                         exprtk_crtype(T1) + "o"    + 
  |                                                         exprtk_crtype(T2) + "))o(" + 
  |                                                         exprtk_crtype(T3) + ")"    ; 
  |                return result; 
  |             } 
  |          }; 
  |       }; 
  |  
  |       #undef exprtk_crtype 
  |  
  |       template <typename T, typename T0, typename T1> 
  |       struct nodetype_T0oT1 { static const typename expression_node<T>::node_type result; }; 
  |       template <typename T, typename T0, typename T1> 
  |       const typename expression_node<T>::node_type nodetype_T0oT1<T,T0,T1>::result = expression_node<T>::e_none; 
  |  
  |       #define synthesis_node_type_define(T0_, T1_, v_)                                                          \ 
  |       template <typename T, typename T0, typename T1>                                                           \ 
  |       struct nodetype_T0oT1<T,T0_,T1_> { static const typename expression_node<T>::node_type result; };         \ 
  |       template <typename T, typename T0, typename T1>                                                           \ 
  |       const typename expression_node<T>::node_type nodetype_T0oT1<T,T0_,T1_>::result = expression_node<T>:: v_; \ 
  |  
  |       synthesis_node_type_define(const T0&, const T1&,  e_vov) 
  |       synthesis_node_type_define(const T0&, const T1 ,  e_voc) 
  |       synthesis_node_type_define(const T0 , const T1&,  e_cov) 
  |       synthesis_node_type_define(      T0&,       T1&, e_none) 
  |       synthesis_node_type_define(const T0 , const T1 , e_none) 
  |       synthesis_node_type_define(      T0&, const T1 , e_none) 
  |       synthesis_node_type_define(const T0 ,       T1&, e_none) 
  |       synthesis_node_type_define(const T0&,       T1&, e_none) 
  |       synthesis_node_type_define(      T0&, const T1&, e_none) 
  |       #undef synthesis_node_type_define 
  |  
  |       template <typename T, typename T0, typename T1, typename T2> 
  |       struct nodetype_T0oT1oT2 { static const typename expression_node<T>::node_type result; }; 
  |       template <typename T, typename T0, typename T1, typename T2> 
  |       const typename expression_node<T>::node_type nodetype_T0oT1oT2<T,T0,T1,T2>::result = expression_node<T>::e_none; 
  |  
  |       #define synthesis_node_type_define(T0_, T1_, T2_, v_)                                                            \ 
  |       template <typename T, typename T0, typename T1, typename T2>                                                     \ 
  |       struct nodetype_T0oT1oT2<T,T0_,T1_,T2_> { static const typename expression_node<T>::node_type result; };         \ 
  |       template <typename T, typename T0, typename T1, typename T2>                                                     \ 
  |       const typename expression_node<T>::node_type nodetype_T0oT1oT2<T,T0_,T1_,T2_>::result = expression_node<T>:: v_; \ 
  |  
  |       synthesis_node_type_define(const T0&, const T1&, const T2&, e_vovov) 
  |       synthesis_node_type_define(const T0&, const T1&, const T2 , e_vovoc) 
  |       synthesis_node_type_define(const T0&, const T1 , const T2&, e_vocov) 
  |       synthesis_node_type_define(const T0 , const T1&, const T2&, e_covov) 
  |       synthesis_node_type_define(const T0 , const T1&, const T2 , e_covoc) 
  |       synthesis_node_type_define(const T0 , const T1 , const T2 , e_none ) 
  |       synthesis_node_type_define(const T0 , const T1 , const T2&, e_none ) 
  |       synthesis_node_type_define(const T0&, const T1 , const T2 , e_none ) 
  |       synthesis_node_type_define(      T0&,       T1&,       T2&, e_none ) 
  |       #undef synthesis_node_type_define 
  |  
  |       template <typename T, typename T0, typename T1, typename T2, typename T3> 
  |       struct nodetype_T0oT1oT2oT3 { static const typename expression_node<T>::node_type result; }; 
  |       template <typename T, typename T0, typename T1, typename T2, typename T3> 
  |       const typename expression_node<T>::node_type nodetype_T0oT1oT2oT3<T,T0,T1,T2,T3>::result = expression_node<T>::e_none; 
  |  
  |       #define synthesis_node_type_define(T0_, T1_, T2_, T3_, v_)                                                              \ 
  |       template <typename T, typename T0, typename T1, typename T2, typename T3>                                               \ 
  |       struct nodetype_T0oT1oT2oT3<T,T0_,T1_,T2_,T3_> { static const typename expression_node<T>::node_type result; };         \ 
  |       template <typename T, typename T0, typename T1, typename T2, typename T3>                                               \ 
  |       const typename expression_node<T>::node_type nodetype_T0oT1oT2oT3<T,T0_,T1_,T2_,T3_>::result = expression_node<T>:: v_; \ 
  |  
  |       synthesis_node_type_define(const T0&, const T1&, const T2&, const T3&, e_vovovov) 
  |       synthesis_node_type_define(const T0&, const T1&, const T2&, const T3 , e_vovovoc) 
  |       synthesis_node_type_define(const T0&, const T1&, const T2 , const T3&, e_vovocov) 
  |       synthesis_node_type_define(const T0&, const T1 , const T2&, const T3&, e_vocovov) 
  |       synthesis_node_type_define(const T0 , const T1&, const T2&, const T3&, e_covovov) 
  |       synthesis_node_type_define(const T0 , const T1&, const T2 , const T3&, e_covocov) 
  |       synthesis_node_type_define(const T0&, const T1 , const T2&, const T3 , e_vocovoc) 
  |       synthesis_node_type_define(const T0 , const T1&, const T2&, const T3 , e_covovoc) 
  |       synthesis_node_type_define(const T0&, const T1 , const T2 , const T3&, e_vococov) 
  |       synthesis_node_type_define(const T0 , const T1 , const T2 , const T3 , e_none   ) 
  |       synthesis_node_type_define(const T0 , const T1 , const T2 , const T3&, e_none   ) 
  |       synthesis_node_type_define(const T0 , const T1 , const T2&, const T3 , e_none   ) 
  |       synthesis_node_type_define(const T0 , const T1&, const T2 , const T3 , e_none   ) 
  |       synthesis_node_type_define(const T0&, const T1 , const T2 , const T3 , e_none   ) 
  |       synthesis_node_type_define(const T0 , const T1 , const T2&, const T3&, e_none   ) 
  |       synthesis_node_type_define(const T0&, const T1&, const T2 , const T3 , e_none   ) 
  |       #undef synthesis_node_type_define 
  |  
  |       template <typename T, typename T0, typename T1> 
  |       class T0oT1 exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef typename details::functor_t<T> functor_t; 
  |          typedef typename functor_t::bfunc_t    bfunc_t; 
  |          typedef T value_type; 
  |          typedef T0oT1<T,T0,T1> node_type; 
  |  
  |          T0oT1(T0 p0, T1 p1, const bfunc_t p2) 
  |          : t0_(p0) 
  |          , t1_(p1) 
  |          , f_ (p2) 
  |          {} 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             static const typename expression_node<T>::node_type result = nodetype_T0oT1<T,T0,T1>::result; 
  |             return result; 
  |          } 
  |  
  |          inline operator_type operation() const exprtk_override 
  |          { 
  |             return e_default; 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return f_(t0_,t1_); 
  |          } 
  |  
  |          inline T0 t0() const 
  |          { 
  |             return t0_; 
  |          } 
  |  
  |          inline T1 t1() const 
  |          { 
  |             return t1_; 
  |          } 
  |  
  |          inline bfunc_t f() const 
  |          { 
  |             return f_; 
  |          } 
  |  
  |          template <typename Allocator> 
  |          static inline expression_node<T>* allocate(Allocator& allocator, 
  |                                                     T0 p0, T1 p1, 
  |                                                     bfunc_t p2) 
  |          { 
  |             return allocator 
  |                      .template allocate_type<node_type, T0, T1, bfunc_t&> 
  |                         (p0, p1, p2); 
  |          } 
  |  
  |       private: 
  |  
  |          T0oT1(const T0oT1<T,T0,T1>&) exprtk_delete; 
  |          T0oT1<T,T0,T1>& operator=(const T0oT1<T,T0,T1>&) { return (*this); } 
  |  
  |          T0 t0_; 
  |          T1 t1_; 
  |          const bfunc_t f_; 
  |       }; 
  |  
  |       template <typename T, typename T0, typename T1, typename T2, typename ProcessMode> 
  |       class T0oT1oT2 exprtk_final : public T0oT1oT2_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef typename details::functor_t<T> functor_t; 
  |          typedef typename functor_t::bfunc_t    bfunc_t; 
  |          typedef T value_type; 
  |          typedef T0oT1oT2<T,T0,T1,T2,ProcessMode> node_type; 
  |          typedef ProcessMode process_mode_t; 
  |  
  |          T0oT1oT2(T0 p0, T1 p1, T2 p2, const bfunc_t p3, const bfunc_t p4) 
  |          : t0_(p0) 
  |          , t1_(p1) 
  |          , t2_(p2) 
  |          , f0_(p3) 
  |          , f1_(p4) 
  |          {} 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             static const typename expression_node<T>::node_type result = nodetype_T0oT1oT2<T,T0,T1,T2>::result; 
  |             return result; 
  |          } 
  |  
  |          inline operator_type operation() 
  |          { 
  |             return e_default; 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return ProcessMode::process(t0_, t1_, t2_, f0_, f1_); 
  |          } 
  |  
  |          inline T0 t0() const 
  |          { 
  |             return t0_; 
  |          } 
  |  
  |          inline T1 t1() const 
  |          { 
  |             return t1_; 
  |          } 
  |  
  |          inline T2 t2() const 
  |          { 
  |             return t2_; 
  |          } 
  |  
  |          bfunc_t f0() const 
  |          { 
  |             return f0_; 
  |          } 
  |  
  |          bfunc_t f1() const 
  |          { 
  |             return f1_; 
  |          } 
  |  
  |          std::string type_id() const exprtk_override 
  |          { 
  |             return id(); 
  |          } 
  |  
  |          static inline std::string id() 
  |          { 
  |             return process_mode_t::template id<T0,T1,T2>(); 
  |          } 
  |  
  |          template <typename Allocator> 
  |          static inline expression_node<T>* allocate(Allocator& allocator, T0 p0, T1 p1, T2 p2, bfunc_t p3, bfunc_t p4) 
  |          { 
  |             return allocator 
  |                       .template allocate_type<node_type, T0, T1, T2, bfunc_t, bfunc_t> 
  |                          (p0, p1, p2, p3, p4); 
  |          } 
  |  
  |       private: 
  |  
  |          T0oT1oT2(const node_type&) exprtk_delete; 
  |          node_type& operator=(const node_type&) exprtk_delete; 
  |  
  |          T0 t0_; 
  |          T1 t1_; 
  |          T2 t2_; 
  |          const bfunc_t f0_; 
  |          const bfunc_t f1_; 
  |       }; 
  |  
  |       template <typename T, typename T0_, typename T1_, typename T2_, typename T3_, typename ProcessMode> 
  |       class T0oT1oT2oT3 exprtk_final : public T0oT1oT2oT3_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef typename details::functor_t<T> functor_t; 
  |          typedef typename functor_t::bfunc_t    bfunc_t; 
  |          typedef T value_type; 
  |          typedef T0_ T0; 
  |          typedef T1_ T1; 
  |          typedef T2_ T2; 
  |          typedef T3_ T3; 
  |          typedef T0oT1oT2oT3<T,T0,T1,T2,T3,ProcessMode> node_type; 
  |          typedef ProcessMode process_mode_t; 
  |  
  |          T0oT1oT2oT3(T0 p0, T1 p1, T2 p2, T3 p3, bfunc_t p4, bfunc_t p5, bfunc_t p6) 
  |          : t0_(p0) 
  |          , t1_(p1) 
  |          , t2_(p2) 
  |          , t3_(p3) 
  |          , f0_(p4) 
  |          , f1_(p5) 
  |          , f2_(p6) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return ProcessMode::process(t0_, t1_, t2_, t3_, f0_, f1_, f2_); 
  |          } 
  |  
  |          inline T0 t0() const 
  |          { 
  |             return t0_; 
  |          } 
  |  
  |          inline T1 t1() const 
  |          { 
  |             return t1_; 
  |          } 
  |  
  |          inline T2 t2() const 
  |          { 
  |             return t2_; 
  |          } 
  |  
  |          inline T3 t3() const 
  |          { 
  |             return t3_; 
  |          } 
  |  
  |          inline bfunc_t f0() const 
  |          { 
  |             return f0_; 
  |          } 
  |  
  |          inline bfunc_t f1() const 
  |          { 
  |             return f1_; 
  |          } 
  |  
  |          inline bfunc_t f2() const 
  |          { 
  |             return f2_; 
  |          } 
  |  
  |          inline std::string type_id() const exprtk_override 
  |          { 
  |             return id(); 
  |          } 
  |  
  |          static inline std::string id() 
  |          { 
  |             return process_mode_t::template id<T0, T1, T2, T3>(); 
  |          } 
  |  
  |          template <typename Allocator> 
  |          static inline expression_node<T>* allocate(Allocator& allocator, 
  |                                                     T0 p0, T1 p1, T2 p2, T3 p3, 
  |                                                     bfunc_t p4, bfunc_t p5, bfunc_t p6) 
  |          { 
  |             return allocator 
  |                       .template allocate_type<node_type, T0, T1, T2, T3, bfunc_t, bfunc_t> 
  |                          (p0, p1, p2, p3, p4, p5, p6); 
  |          } 
  |  
  |       private: 
  |  
  |          T0oT1oT2oT3(const node_type&) exprtk_delete; 
  |          node_type& operator=(const node_type&) exprtk_delete; 
  |  
  |          T0 t0_; 
  |          T1 t1_; 
  |          T2 t2_; 
  |          T3 t3_; 
  |          const bfunc_t f0_; 
  |          const bfunc_t f1_; 
  |          const bfunc_t f2_; 
  |       }; 
  |  
  |       template <typename T, typename T0, typename T1, typename T2> 
  |       class T0oT1oT2_sf3 exprtk_final : public T0oT1oT2_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef typename details::functor_t<T> functor_t; 
  |          typedef typename functor_t::tfunc_t    tfunc_t; 
  |          typedef T value_type; 
  |          typedef T0oT1oT2_sf3<T,T0,T1,T2> node_type; 
  |  
  |          T0oT1oT2_sf3(T0 p0, T1 p1, T2 p2, const tfunc_t p3) 
  |          : t0_(p0) 
  |          , t1_(p1) 
  |          , t2_(p2) 
  |          , f_ (p3) 
  |          {} 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             static const typename expression_node<T>::node_type result = nodetype_T0oT1oT2<T,T0,T1,T2>::result; 
  |             return result; 
  |          } 
  |  
  |          inline operator_type operation() const exprtk_override 
  |          { 
  |             return e_default; 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return f_(t0_, t1_, t2_); 
  |          } 
  |  
  |          inline T0 t0() const 
  |          { 
  |             return t0_; 
  |          } 
  |  
  |          inline T1 t1() const 
  |          { 
  |             return t1_; 
  |          } 
  |  
  |          inline T2 t2() const 
  |          { 
  |             return t2_; 
  |          } 
  |  
  |          tfunc_t f() const 
  |          { 
  |             return f_; 
  |          } 
  |  
  |          std::string type_id() const 
  |          { 
  |             return id(); 
  |          } 
  |  
  |          static inline std::string id() 
  |          { 
  |             return "sf3" 
  |          } 
  |  
  |          template <typename Allocator> 
  |          static inline expression_node<T>* allocate(Allocator& allocator, T0 p0, T1 p1, T2 p2, tfunc_t p3) 
  |          { 
  |             return allocator 
  |                      .template allocate_type<node_type, T0, T1, T2, tfunc_t> 
  |                         (p0, p1, p2, p3); 
  |          } 
  |  
  |       private: 
  |  
  |          T0oT1oT2_sf3(const node_type&) exprtk_delete; 
  |          node_type& operator=(const node_type&) exprtk_delete; 
  |  
  |          T0 t0_; 
  |          T1 t1_; 
  |          T2 t2_; 
  |          const tfunc_t f_; 
  |       }; 
  |  
  |       template <typename T, typename T0, typename T1, typename T2> 
  |       class sf3ext_type_node : public T0oT1oT2_base_node<T> 
  |       { 
  |       public: 
  |  
  |          virtual ~sf3ext_type_node() 
  |          {} 
  |  
  |          virtual T0 t0() const = 0; 
  |  
  |          virtual T1 t1() const = 0; 
  |  
  |          virtual T2 t2() const = 0; 
  |       }; 
  |  
  |       template <typename T, typename T0, typename T1, typename T2, typename SF3Operation> 
  |       class T0oT1oT2_sf3ext exprtk_final : public sf3ext_type_node<T,T0,T1,T2> 
  |       { 
  |       public: 
  |  
  |          typedef T value_type; 
  |          typedef T0oT1oT2_sf3ext<T, T0, T1, T2, SF3Operation> node_type; 
  |  
  |          T0oT1oT2_sf3ext(T0 p0, T1 p1, T2 p2) 
  |          : t0_(p0) 
  |          , t1_(p1) 
  |          , t2_(p2) 
  |          {} 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             static const typename expression_node<T>::node_type result = nodetype_T0oT1oT2<T,T0,T1,T2>::result; 
  |             return result; 
  |          } 
  |  
  |          inline operator_type operation() 
  |          { 
  |             return e_default; 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return SF3Operation::process(t0_, t1_, t2_); 
  |          } 
  |  
  |          T0 t0() const exprtk_override 
  |          { 
  |             return t0_; 
  |          } 
  |  
  |          T1 t1() const exprtk_override 
  |          { 
  |             return t1_; 
  |          } 
  |  
  |          T2 t2() const exprtk_override 
  |          { 
  |             return t2_; 
  |          } 
  |  
  |          std::string type_id() const exprtk_override 
  |          { 
  |             return id(); 
  |          } 
  |  
  |          static inline std::string id() 
  |          { 
  |             return SF3Operation::id(); 
  |          } 
  |  
  |          template <typename Allocator> 
  |          static inline expression_node<T>* allocate(Allocator& allocator, T0 p0, T1 p1, T2 p2) 
  |          { 
  |             return allocator 
  |                      .template allocate_type<node_type, T0, T1, T2> 
  |                         (p0, p1, p2); 
  |          } 
  |  
  |       private: 
  |  
  |          T0oT1oT2_sf3ext(const node_type&) exprtk_delete; 
  |          node_type& operator=(const node_type&) exprtk_delete; 
  |  
  |          T0 t0_; 
  |          T1 t1_; 
  |          T2 t2_; 
  |       }; 
  |  
  |       template <typename T> 
  |       inline bool is_sf3ext_node(const expression_node<T>* n) 
  |       { 
  |          switch (n->type()) 
  |          { 
  |             case expression_node<T>::e_vovov : return true; 
  |             case expression_node<T>::e_vovoc : return true; 
  |             case expression_node<T>::e_vocov : return true; 
  |             case expression_node<T>::e_covov : return true; 
  |             case expression_node<T>::e_covoc : return true; 
  |             default                          : return false; 
  |          } 
  |       } 
  |  
  |       template <typename T, typename T0, typename T1, typename T2, typename T3> 
  |       class T0oT1oT2oT3_sf4 exprtk_final : public T0oT1oT2_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef typename details::functor_t<T> functor_t; 
  |          typedef typename functor_t::qfunc_t    qfunc_t; 
  |          typedef T value_type; 
  |          typedef T0oT1oT2oT3_sf4<T, T0, T1, T2, T3> node_type; 
  |  
  |          T0oT1oT2oT3_sf4(T0 p0, T1 p1, T2 p2, T3 p3, const qfunc_t p4) 
  |          : t0_(p0) 
  |          , t1_(p1) 
  |          , t2_(p2) 
  |          , t3_(p3) 
  |          , f_ (p4) 
  |          {} 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             static const typename expression_node<T>::node_type result = nodetype_T0oT1oT2oT3<T,T0,T1,T2,T3>::result; 
  |             return result; 
  |          } 
  |  
  |          inline operator_type operation() const exprtk_override 
  |          { 
  |             return e_default; 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return f_(t0_, t1_, t2_, t3_); 
  |          } 
  |  
  |          inline T0 t0() const 
  |          { 
  |             return t0_; 
  |          } 
  |  
  |          inline T1 t1() const 
  |          { 
  |             return t1_; 
  |          } 
  |  
  |          inline T2 t2() const 
  |          { 
  |             return t2_; 
  |          } 
  |  
  |          inline T3 t3() const 
  |          { 
  |             return t3_; 
  |          } 
  |  
  |          qfunc_t f() const 
  |          { 
  |             return f_; 
  |          } 
  |  
  |          std::string type_id() const 
  |          { 
  |             return id(); 
  |          } 
  |  
  |          static inline std::string id() 
  |          { 
  |             return "sf4" 
  |          } 
  |  
  |          template <typename Allocator> 
  |          static inline expression_node<T>* allocate(Allocator& allocator, T0 p0, T1 p1, T2 p2, T3 p3, qfunc_t p4) 
  |          { 
  |             return allocator 
  |                      .template allocate_type<node_type, T0, T1, T2, T3, qfunc_t> 
  |                         (p0, p1, p2, p3, p4); 
  |          } 
  |  
  |       private: 
  |  
  |          T0oT1oT2oT3_sf4(const node_type&) exprtk_delete; 
  |          node_type& operator=(const node_type&) exprtk_delete; 
  |  
  |          T0 t0_; 
  |          T1 t1_; 
  |          T2 t2_; 
  |          T3 t3_; 
  |          const qfunc_t f_; 
  |       }; 
  |  
  |       template <typename T, typename T0, typename T1, typename T2, typename T3, typename SF4Operation> 
  |       class T0oT1oT2oT3_sf4ext exprtk_final : public T0oT1oT2oT3_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef T value_type; 
  |          typedef T0oT1oT2oT3_sf4ext<T, T0, T1, T2, T3, SF4Operation> node_type; 
  |  
  |          T0oT1oT2oT3_sf4ext(T0 p0, T1 p1, T2 p2, T3 p3) 
  |          : t0_(p0) 
  |          , t1_(p1) 
  |          , t2_(p2) 
  |          , t3_(p3) 
  |          {} 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             static const typename expression_node<T>::node_type result = nodetype_T0oT1oT2oT3<T,T0,T1,T2,T3>::result; 
  |             return result; 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return SF4Operation::process(t0_, t1_, t2_, t3_); 
  |          } 
  |  
  |          inline T0 t0() const 
  |          { 
  |             return t0_; 
  |          } 
  |  
  |          inline T1 t1() const 
  |          { 
  |             return t1_; 
  |          } 
  |  
  |          inline T2 t2() const 
  |          { 
  |             return t2_; 
  |          } 
  |  
  |          inline T3 t3() const 
  |          { 
  |             return t3_; 
  |          } 
  |  
  |          std::string type_id() const exprtk_override 
  |          { 
  |             return id(); 
  |          } 
  |  
  |          static inline std::string id() 
  |          { 
  |             return SF4Operation::id(); 
  |          } 
  |  
  |          template <typename Allocator> 
  |          static inline expression_node<T>* allocate(Allocator& allocator, T0 p0, T1 p1, T2 p2, T3 p3) 
  |          { 
  |             return allocator 
  |                      .template allocate_type<node_type, T0, T1, T2, T3> 
  |                         (p0, p1, p2, p3); 
  |          } 
  |  
  |       private: 
  |  
  |          T0oT1oT2oT3_sf4ext(const node_type&) exprtk_delete; 
  |          node_type& operator=(const node_type&) exprtk_delete; 
  |  
  |          T0 t0_; 
  |          T1 t1_; 
  |          T2 t2_; 
  |          T3 t3_; 
  |       }; 
  |  
  |       template <typename T> 
  |       inline bool is_sf4ext_node(const expression_node<T>* n) 
  |       { 
  |          switch (n->type()) 
  |          { 
  |             case expression_node<T>::e_vovovov : return true; 
  |             case expression_node<T>::e_vovovoc : return true; 
  |             case expression_node<T>::e_vovocov : return true; 
  |             case expression_node<T>::e_vocovov : return true; 
  |             case expression_node<T>::e_covovov : return true; 
  |             case expression_node<T>::e_covocov : return true; 
  |             case expression_node<T>::e_vocovoc : return true; 
  |             case expression_node<T>::e_covovoc : return true; 
  |             case expression_node<T>::e_vococov : return true; 
  |             default                            : return false; 
  |          } 
  |       } 
  |  
  |       template <typename T, typename T0, typename T1> 
  |       struct T0oT1_define 
  |       { 
  |          typedef details::T0oT1<T, T0, T1> type0; 
  |       }; 
  |  
  |       template <typename T, typename T0, typename T1, typename T2> 
  |       struct T0oT1oT2_define 
  |       { 
  |          typedef details::T0oT1oT2<T, T0, T1, T2, typename T0oT1oT2process<T>::mode0> type0; 
  |          typedef details::T0oT1oT2<T, T0, T1, T2, typename T0oT1oT2process<T>::mode1> type1; 
  |          typedef details::T0oT1oT2_sf3<T, T0, T1, T2> sf3_type; 
  |          typedef details::sf3ext_type_node<T, T0, T1, T2> sf3_type_node; 
  |       }; 
  |  
  |       template <typename T, typename T0, typename T1, typename T2, typename T3> 
  |       struct T0oT1oT2oT3_define 
  |       { 
  |          typedef details::T0oT1oT2oT3<T, T0, T1, T2, T3, typename T0oT1oT20T3process<T>::mode0> type0; 
  |          typedef details::T0oT1oT2oT3<T, T0, T1, T2, T3, typename T0oT1oT20T3process<T>::mode1> type1; 
  |          typedef details::T0oT1oT2oT3<T, T0, T1, T2, T3, typename T0oT1oT20T3process<T>::mode2> type2; 
  |          typedef details::T0oT1oT2oT3<T, T0, T1, T2, T3, typename T0oT1oT20T3process<T>::mode3> type3; 
  |          typedef details::T0oT1oT2oT3<T, T0, T1, T2, T3, typename T0oT1oT20T3process<T>::mode4> type4; 
  |          typedef details::T0oT1oT2oT3_sf4<T, T0, T1, T2, T3> sf4_type; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class vov_node exprtk_final : public vov_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef Operation operation_t; 
  |  
  |          // variable op variable node 
  |          explicit vov_node(const T& var0, const T& var1) 
  |          : v0_(var0) 
  |          , v1_(var1) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return Operation::process(v0_,v1_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return Operation::type(); 
  |          } 
  |  
  |          inline operator_type operation() const exprtk_override 
  |          { 
  |             return Operation::operation(); 
  |          } 
  |  
  |          inline const T& v0() const exprtk_override 
  |          { 
  |             return v0_; 
  |          } 
  |  
  |          inline const T& v1() const exprtk_override 
  |          { 
  |             return v1_; 
  |          } 
  |  
  |       protected: 
  |  
  |          const T& v0_; 
  |          const T& v1_; 
  |  
  |       private: 
  |  
  |          vov_node(const vov_node<T,Operation>&) exprtk_delete; 
  |          vov_node<T,Operation>& operator=(const vov_node<T,Operation>&) exprtk_delete; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class cov_node exprtk_final : public cov_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef Operation operation_t; 
  |  
  |          // constant op variable node 
  |          explicit cov_node(const T& const_var, const T& var) 
  |          : c_(const_var) 
  |          , v_(var) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return Operation::process(c_,v_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return Operation::type(); 
  |          } 
  |  
  |          inline operator_type operation() const exprtk_override 
  |          { 
  |             return Operation::operation(); 
  |          } 
  |  
  |          inline const T c() const exprtk_override 
  |          { 
  |             return c_; 
  |          } 
  |  
  |          inline const T& v() const exprtk_override 
  |          { 
  |             return v_; 
  |          } 
  |  
  |       protected: 
  |  
  |          const T  c_; 
  |          const T& v_; 
  |  
  |       private: 
  |  
  |          cov_node(const cov_node<T,Operation>&) exprtk_delete; 
  |          cov_node<T,Operation>& operator=(const cov_node<T,Operation>&) exprtk_delete; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class voc_node exprtk_final : public voc_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef Operation operation_t; 
  |  
  |          // variable op constant node 
  |          explicit voc_node(const T& var, const T& const_var) 
  |          : v_(var) 
  |          , c_(const_var) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return Operation::process(v_,c_); 
  |          } 
  |  
  |          inline operator_type operation() const exprtk_override 
  |          { 
  |             return Operation::operation(); 
  |          } 
  |  
  |          inline const T c() const exprtk_override 
  |          { 
  |             return c_; 
  |          } 
  |  
  |          inline const T& v() const exprtk_override 
  |          { 
  |             return v_; 
  |          } 
  |  
  |       protected: 
  |  
  |          const T& v_; 
  |          const T  c_; 
  |  
  |       private: 
  |  
  |          voc_node(const voc_node<T,Operation>&) exprtk_delete; 
  |          voc_node<T,Operation>& operator=(const voc_node<T,Operation>&) exprtk_delete; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class vob_node exprtk_final : public vob_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |          typedef Operation operation_t; 
  |  
  |          // variable op binary node 
  |          explicit vob_node(const T& var, const expression_ptr branch) 
  |          : v_(var) 
  |          { 
  |             construct_branch_pair(branch_, branch); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return Operation::process(v_,branch_.first->value()); 
  |          } 
  |  
  |          inline const T& v() const exprtk_override 
  |          { 
  |             return v_; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return branch_.first && branch_.first->valid(); 
  |          } 
  |  
  |          inline expression_node<T>* branch(const std::size_t&) const exprtk_override 
  |          { 
  |             return branch_.first; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(branch_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(branch_); 
  |          } 
  |  
  |       private: 
  |  
  |          vob_node(const vob_node<T,Operation>&) exprtk_delete; 
  |          vob_node<T,Operation>& operator=(const vob_node<T,Operation>&) exprtk_delete; 
  |  
  |          const T& v_; 
  |          branch_t branch_; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class bov_node exprtk_final : public bov_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |          typedef Operation operation_t; 
  |  
  |          // binary node op variable node 
  |          explicit bov_node(const expression_ptr branch, const T& var) 
  |          : v_(var) 
  |          { 
  |             construct_branch_pair(branch_, branch); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return Operation::process(branch_.first->value(),v_); 
  |          } 
  |  
  |          inline const T& v() const exprtk_override 
  |          { 
  |             return v_; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return branch_.first && branch_.first->valid(); 
  |          } 
  |  
  |          inline expression_node<T>* branch(const std::size_t&) const exprtk_override 
  |          { 
  |             return branch_.first; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(branch_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(branch_); 
  |          } 
  |  
  |       private: 
  |  
  |          bov_node(const bov_node<T,Operation>&) exprtk_delete; 
  |          bov_node<T,Operation>& operator=(const bov_node<T,Operation>&) exprtk_delete; 
  |  
  |          const T& v_; 
  |          branch_t branch_; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class cob_node exprtk_final : public cob_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |          typedef Operation operation_t; 
  |  
  |          // constant op variable node 
  |          explicit cob_node(const T const_var, const expression_ptr branch) 
  |          : c_(const_var) 
  |          { 
  |             construct_branch_pair(branch_, branch); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return Operation::process(c_,branch_.first->value()); 
  |          } 
  |  
  |          inline operator_type operation() const exprtk_override 
  |          { 
  |             return Operation::operation(); 
  |          } 
  |  
  |          inline const T c() const exprtk_override 
  |          { 
  |             return c_; 
  |          } 
  |  
  |          inline void set_c(const T new_c) exprtk_override 
  |          { 
  |             (*const_cast<T*>(&c_)) = new_c; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return branch_.first && branch_.first->valid(); 
  |          } 
  |  
  |          inline expression_node<T>* branch(const std::size_t&) const exprtk_override 
  |          { 
  |             return branch_.first; 
  |          } 
  |  
  |          inline expression_node<T>* move_branch(const std::size_t&) exprtk_override 
  |          { 
  |             branch_.second = false; 
  |             return branch_.first; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(branch_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(branch_); 
  |          } 
  |  
  |       private: 
  |  
  |          cob_node(const cob_node<T,Operation>&) exprtk_delete; 
  |          cob_node<T,Operation>& operator=(const cob_node<T,Operation>&) exprtk_delete; 
  |  
  |          const T  c_; 
  |          branch_t branch_; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class boc_node exprtk_final : public boc_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr,bool> branch_t; 
  |          typedef Operation operation_t; 
  |  
  |          // binary node op constant node 
  |          explicit boc_node(const expression_ptr branch, const T const_var) 
  |          : c_(const_var) 
  |          { 
  |             construct_branch_pair(branch_, branch); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return Operation::process(branch_.first->value(),c_); 
  |          } 
  |  
  |          inline operator_type operation() const exprtk_override 
  |          { 
  |             return Operation::operation(); 
  |          } 
  |  
  |          inline const T c() const exprtk_override 
  |          { 
  |             return c_; 
  |          } 
  |  
  |          inline void set_c(const T new_c) exprtk_override 
  |          { 
  |             (*const_cast<T*>(&c_)) = new_c; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return branch_.first && branch_.first->valid(); 
  |          } 
  |  
  |          inline expression_node<T>* branch(const std::size_t&) const exprtk_override 
  |          { 
  |             return branch_.first; 
  |          } 
  |  
  |          inline expression_node<T>* move_branch(const std::size_t&) exprtk_override 
  |          { 
  |             branch_.second = false; 
  |             return branch_.first; 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(branch_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(branch_); 
  |          } 
  |  
  |       private: 
  |  
  |          boc_node(const boc_node<T,Operation>&) exprtk_delete; 
  |          boc_node<T,Operation>& operator=(const boc_node<T,Operation>&) exprtk_delete; 
  |  
  |          const T  c_; 
  |          branch_t branch_; 
  |       }; 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       template <typename T, typename SType0, typename SType1, typename Operation> 
  |       class sos_node exprtk_final : public sos_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef Operation operation_t; 
  |  
  |          // string op string node 
  |          explicit sos_node(SType0 p0, SType1 p1) 
  |          : s0_(p0) 
  |          , s1_(p1) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return Operation::process(s0_,s1_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return Operation::type(); 
  |          } 
  |  
  |          inline operator_type operation() const exprtk_override 
  |          { 
  |             return Operation::operation(); 
  |          } 
  |  
  |          inline std::string& s0() 
  |          { 
  |             return s0_; 
  |          } 
  |  
  |          inline std::string& s1() 
  |          { 
  |             return s1_; 
  |          } 
  |  
  |       protected: 
  |  
  |          SType0 s0_; 
  |          SType1 s1_; 
  |  
  |       private: 
  |  
  |          sos_node(const sos_node<T,SType0,SType1,Operation>&) exprtk_delete; 
  |          sos_node<T,SType0,SType1,Operation>& operator=(const sos_node<T,SType0,SType1,Operation>&) exprtk_delete; 
  |       }; 
  |  
  |       template <typename T, typename SType0, typename SType1, typename RangePack, typename Operation> 
  |       class str_xrox_node exprtk_final : public sos_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef Operation operation_t; 
  |          typedef str_xrox_node<T,SType0,SType1,RangePack,Operation> node_type; 
  |  
  |          // string-range op string node 
  |          explicit str_xrox_node(SType0 p0, SType1 p1, RangePack rp0) 
  |          : s0_ (p0 ) 
  |          , s1_ (p1 ) 
  |          , rp0_(rp0) 
  |          {} 
  |  
  |         ~str_xrox_node() 
  |          { 
  |             rp0_.free(); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             std::size_t r0 = 0; 
  |             std::size_t r1 = 0; 
  |  
  |             if (rp0_(r0, r1, s0_.size())) 
  |                return Operation::process(s0_.substr(r0, (r1 - r0) + 1), s1_); 
  |             else 
  |                return T(0); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return Operation::type(); 
  |          } 
  |  
  |          inline operator_type operation() const exprtk_override 
  |          { 
  |             return Operation::operation(); 
  |          } 
  |  
  |          inline std::string& s0() 
  |          { 
  |             return s0_; 
  |          } 
  |  
  |          inline std::string& s1() 
  |          { 
  |             return s1_; 
  |          } 
  |  
  |       protected: 
  |  
  |          SType0    s0_; 
  |          SType1    s1_; 
  |          RangePack rp0_; 
  |  
  |       private: 
  |  
  |          str_xrox_node(const node_type&) exprtk_delete; 
  |          node_type& operator=(const node_type&) exprtk_delete; 
  |       }; 
  |  
  |       template <typename T, typename SType0, typename SType1, typename RangePack, typename Operation> 
  |       class str_xoxr_node exprtk_final : public sos_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef Operation operation_t; 
  |          typedef str_xoxr_node<T,SType0,SType1,RangePack,Operation> node_type; 
  |  
  |          // string op string range node 
  |          explicit str_xoxr_node(SType0 p0, SType1 p1, RangePack rp1) 
  |          : s0_ (p0 ) 
  |          , s1_ (p1 ) 
  |          , rp1_(rp1) 
  |          {} 
  |  
  |         ~str_xoxr_node() 
  |          { 
  |             rp1_.free(); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             std::size_t r0 = 0; 
  |             std::size_t r1 = 0; 
  |  
  |             if (rp1_(r0, r1, s1_.size())) 
  |             { 
  |                return Operation::process 
  |                       ( 
  |                          s0_, 
  |                          s1_.substr(r0, (r1 - r0) + 1) 
  |                       ); 
  |             } 
  |             else 
  |                return T(0); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return Operation::type(); 
  |          } 
  |  
  |          inline operator_type operation() const exprtk_override 
  |          { 
  |             return Operation::operation(); 
  |          } 
  |  
  |          inline std::string& s0() 
  |          { 
  |             return s0_; 
  |          } 
  |  
  |          inline std::string& s1() 
  |          { 
  |             return s1_; 
  |          } 
  |  
  |       protected: 
  |  
  |          SType0    s0_; 
  |          SType1    s1_; 
  |          RangePack rp1_; 
  |  
  |       private: 
  |  
  |          str_xoxr_node(const node_type&) exprtk_delete; 
  |          node_type& operator=(const node_type&) exprtk_delete; 
  |       }; 
  |  
  |       template <typename T, typename SType0, typename SType1, typename RangePack, typename Operation> 
  |       class str_xroxr_node exprtk_final : public sos_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef Operation operation_t; 
  |          typedef str_xroxr_node<T,SType0,SType1,RangePack,Operation> node_type; 
  |  
  |          // string-range op string-range node 
  |          explicit str_xroxr_node(SType0 p0, SType1 p1, RangePack rp0, RangePack rp1) 
  |          : s0_ (p0 ) 
  |          , s1_ (p1 ) 
  |          , rp0_(rp0) 
  |          , rp1_(rp1) 
  |          {} 
  |  
  |         ~str_xroxr_node() 
  |          { 
  |             rp0_.free(); 
  |             rp1_.free(); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             std::size_t r0_0 = 0; 
  |             std::size_t r0_1 = 0; 
  |             std::size_t r1_0 = 0; 
  |             std::size_t r1_1 = 0; 
  |  
  |             if ( 
  |                  rp0_(r0_0, r1_0, s0_.size()) && 
  |                  rp1_(r0_1, r1_1, s1_.size()) 
  |                ) 
  |             { 
  |                return Operation::process 
  |                       ( 
  |                          s0_.substr(r0_0, (r1_0 - r0_0) + 1), 
  |                          s1_.substr(r0_1, (r1_1 - r0_1) + 1) 
  |                       ); 
  |             } 
  |             else 
  |                return T(0); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return Operation::type(); 
  |          } 
  |  
  |          inline operator_type operation() const exprtk_override 
  |          { 
  |             return Operation::operation(); 
  |          } 
  |  
  |          inline std::string& s0() 
  |          { 
  |             return s0_; 
  |          } 
  |  
  |          inline std::string& s1() 
  |          { 
  |             return s1_; 
  |          } 
  |  
  |       protected: 
  |  
  |          SType0    s0_; 
  |          SType1    s1_; 
  |          RangePack rp0_; 
  |          RangePack rp1_; 
  |  
  |       private: 
  |  
  |          str_xroxr_node(const node_type&) exprtk_delete; 
  |          node_type& operator=(const node_type&) exprtk_delete; 
  |       }; 
  |  
  |       template <typename T, typename Operation> 
  |       class str_sogens_node exprtk_final : public binary_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node <T>* expression_ptr; 
  |          typedef string_base_node<T>* str_base_ptr; 
  |          typedef range_pack      <T>  range_t; 
  |          typedef range_t*             range_ptr; 
  |          typedef range_interface <T>  irange_t; 
  |          typedef irange_t*            irange_ptr; 
  |  
  |          using binary_node<T>::branch; 
  |  
  |          str_sogens_node(const operator_type& opr, 
  |                          expression_ptr branch0, 
  |                          expression_ptr branch1) 
  |          : binary_node<T>(opr, branch0, branch1) 
  |          , str0_base_ptr_ (0) 
  |          , str1_base_ptr_ (0) 
  |          , str0_range_ptr_(0) 
  |          , str1_range_ptr_(0) 
  |          , initialised_   (false) 
  |          { 
  |             if (is_generally_string_node(branch(0))) 
  |             { 
  |                str0_base_ptr_ = dynamic_cast<str_base_ptr>(branch(0)); 
  |  
  |                if (0 == str0_base_ptr_) 
  |                   return; 
  |  
  |                irange_ptr range = dynamic_cast<irange_ptr>(branch(0)); 
  |  
  |                if (0 == range) 
  |                   return; 
  |  
  |                str0_range_ptr_ = &(range->range_ref()); 
  |             } 
  |  
  |             if (is_generally_string_node(branch(1))) 
  |             { 
  |                str1_base_ptr_ = dynamic_cast<str_base_ptr>(branch(1)); 
  |  
  |                if (0 == str1_base_ptr_) 
  |                   return; 
  |  
  |                irange_ptr range = dynamic_cast<irange_ptr>(branch(1)); 
  |  
  |                if (0 == range) 
  |                   return; 
  |  
  |                str1_range_ptr_ = &(range->range_ref()); 
  |             } 
  |  
  |             initialised_ = 
  |                str0_base_ptr_  && 
  |                str1_base_ptr_  && 
  |                str0_range_ptr_ && 
  |                str1_range_ptr_; 
  |  
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             branch(0)->value(); 
  |             branch(1)->value(); 
  |  
  |             std::size_t str0_r0 = 0; 
  |             std::size_t str0_r1 = 0; 
  |  
  |             std::size_t str1_r0 = 0; 
  |             std::size_t str1_r1 = 0; 
  |  
  |             const range_t& range0 = (*str0_range_ptr_); 
  |             const range_t& range1 = (*str1_range_ptr_); 
  |  
  |             if ( 
  |                  range0(str0_r0, str0_r1, str0_base_ptr_->size()) && 
  |                  range1(str1_r0, str1_r1, str1_base_ptr_->size()) 
  |                ) 
  |             { 
  |                return Operation::process 
  |                       ( 
  |                          str0_base_ptr_->str().substr(str0_r0,(str0_r1 - str0_r0)), 
  |                          str1_base_ptr_->str().substr(str1_r0,(str1_r1 - str1_r0)) 
  |                       ); 
  |             } 
  |  
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return Operation::type(); 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return initialised_; 
  |          } 
  |  
  |       private: 
  |  
  |          str_sogens_node(const str_sogens_node<T,Operation>&) exprtk_delete; 
  |          str_sogens_node<T,Operation>& operator=(const str_sogens_node<T,Operation>&) exprtk_delete; 
  |  
  |          str_base_ptr str0_base_ptr_; 
  |          str_base_ptr str1_base_ptr_; 
  |          range_ptr    str0_range_ptr_; 
  |          range_ptr    str1_range_ptr_; 
  |          bool         initialised_; 
  |       }; 
  |  
  |       template <typename T, typename SType0, typename SType1, typename SType2, typename Operation> 
  |       class sosos_node exprtk_final : public sosos_base_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef Operation operation_t; 
  |          typedef sosos_node<T, SType0, SType1, SType2, Operation> node_type; 
  |  
  |          // string op string op string node 
  |          explicit sosos_node(SType0 p0, SType1 p1, SType2 p2) 
  |          : s0_(p0) 
  |          , s1_(p1) 
  |          , s2_(p2) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return Operation::process(s0_, s1_, s2_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return Operation::type(); 
  |          } 
  |  
  |          inline operator_type operation() const exprtk_override 
  |          { 
  |             return Operation::operation(); 
  |          } 
  |  
  |          inline std::string& s0() 
  |          { 
  |             return s0_; 
  |          } 
  |  
  |          inline std::string& s1() 
  |          { 
  |             return s1_; 
  |          } 
  |  
  |          inline std::string& s2() 
  |          { 
  |             return s2_; 
  |          } 
  |  
  |       protected: 
  |  
  |          SType0 s0_; 
  |          SType1 s1_; 
  |          SType2 s2_; 
  |  
  |       private: 
  |  
  |          sosos_node(const node_type&) exprtk_delete; 
  |          node_type& operator=(const node_type&) exprtk_delete; 
  |       }; 
  |       #endif 
  |  
  |       template <typename T, typename PowOp> 
  |       class ipow_node exprtk_final: public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef PowOp operation_t; 
  |  
  |          explicit ipow_node(const T& v) 
  |          : v_(v) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return PowOp::result(v_); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_ipow; 
  |          } 
  |  
  |       private: 
  |  
  |          ipow_node(const ipow_node<T,PowOp>&) exprtk_delete; 
  |          ipow_node<T,PowOp>& operator=(const ipow_node<T,PowOp>&) exprtk_delete; 
  |  
  |          const T& v_; 
  |       }; 
  |  
  |       template <typename T, typename PowOp> 
  |       class bipow_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr, bool> branch_t; 
  |          typedef PowOp operation_t; 
  |  
  |          explicit bipow_node(expression_ptr branch) 
  |          { 
  |             construct_branch_pair(branch_, branch); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return PowOp::result(branch_.first->value()); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_ipow; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return branch_.first && branch_.first->valid(); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(branch_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(branch_); 
  |          } 
  |  
  |       private: 
  |  
  |          bipow_node(const bipow_node<T,PowOp>&) exprtk_delete; 
  |          bipow_node<T,PowOp>& operator=(const bipow_node<T,PowOp>&) exprtk_delete; 
  |  
  |          branch_t branch_; 
  |       }; 
  |  
  |       template <typename T, typename PowOp> 
  |       class ipowinv_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef PowOp operation_t; 
  |  
  |          explicit ipowinv_node(const T& v) 
  |          : v_(v) 
  |          {} 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return (T(1) / PowOp::result(v_)); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_ipowinv; 
  |          } 
  |  
  |       private: 
  |  
  |          ipowinv_node(const ipowinv_node<T,PowOp>&) exprtk_delete; 
  |          ipowinv_node<T,PowOp>& operator=(const ipowinv_node<T,PowOp>&) exprtk_delete; 
  |  
  |          const T& v_; 
  |       }; 
  |  
  |       template <typename T, typename PowOp> 
  |       class bipowinv_node exprtk_final : public expression_node<T> 
  |       { 
  |       public: 
  |  
  |          typedef expression_node<T>* expression_ptr; 
  |          typedef std::pair<expression_ptr, bool> branch_t; 
  |          typedef PowOp operation_t; 
  |  
  |          explicit bipowinv_node(expression_ptr branch) 
  |          { 
  |             construct_branch_pair(branch_, branch); 
  |             assert(valid()); 
  |          } 
  |  
  |          inline T value() const exprtk_override 
  |          { 
  |             return (T(1) / PowOp::result(branch_.first->value())); 
  |          } 
  |  
  |          inline typename expression_node<T>::node_type type() const exprtk_override 
  |          { 
  |             return expression_node<T>::e_ipowinv; 
  |          } 
  |  
  |          inline bool valid() const exprtk_override 
  |          { 
  |             return branch_.first && branch_.first->valid(); 
  |          } 
  |  
  |          void collect_nodes(typename expression_node<T>::noderef_list_t& node_delete_list) exprtk_override 
  |          { 
  |             expression_node<T>::ndb_t::collect(branch_, node_delete_list); 
  |          } 
  |  
  |          std::size_t node_depth() const exprtk_override 
  |          { 
  |             return expression_node<T>::ndb_t::compute_node_depth(branch_); 
  |          } 
  |  
  |       private: 
  |  
  |          bipowinv_node(const bipowinv_node<T,PowOp>&) exprtk_delete; 
  |          bipowinv_node<T,PowOp>& operator=(const bipowinv_node<T,PowOp>&) exprtk_delete; 
  |  
  |          branch_t branch_; 
  |       }; 
  |  
  |       template <typename T> 
  |       inline bool is_vov_node(const expression_node<T>* node) 
  |       { 
  |          return (0 != dynamic_cast<const vov_base_node<T>*>(node)); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_cov_node(const expression_node<T>* node) 
  |       { 
  |          return (0 != dynamic_cast<const cov_base_node<T>*>(node)); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_voc_node(const expression_node<T>* node) 
  |       { 
  |          return (0 != dynamic_cast<const voc_base_node<T>*>(node)); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_cob_node(const expression_node<T>* node) 
  |       { 
  |          return (0 != dynamic_cast<const cob_base_node<T>*>(node)); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_boc_node(const expression_node<T>* node) 
  |       { 
  |          return (0 != dynamic_cast<const boc_base_node<T>*>(node)); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_t0ot1ot2_node(const expression_node<T>* node) 
  |       { 
  |          return (0 != dynamic_cast<const T0oT1oT2_base_node<T>*>(node)); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_t0ot1ot2ot3_node(const expression_node<T>* node) 
  |       { 
  |          return (0 != dynamic_cast<const T0oT1oT2oT3_base_node<T>*>(node)); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_uv_node(const expression_node<T>* node) 
  |       { 
  |          return (0 != dynamic_cast<const uv_base_node<T>*>(node)); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_string_node(const expression_node<T>* node) 
  |       { 
  |          return node && (expression_node<T>::e_stringvar == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_string_range_node(const expression_node<T>* node) 
  |       { 
  |          return node && (expression_node<T>::e_stringvarrng == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_const_string_node(const expression_node<T>* node) 
  |       { 
  |          return node && (expression_node<T>::e_stringconst == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_const_string_range_node(const expression_node<T>* node) 
  |       { 
  |          return node && (expression_node<T>::e_cstringvarrng == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_string_assignment_node(const expression_node<T>* node) 
  |       { 
  |          return node && (expression_node<T>::e_strass == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_string_concat_node(const expression_node<T>* node) 
  |       { 
  |          return node && (expression_node<T>::e_strconcat == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_string_function_node(const expression_node<T>* node) 
  |       { 
  |          return node && (expression_node<T>::e_strfunction == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_string_condition_node(const expression_node<T>* node) 
  |       { 
  |          return node && (expression_node<T>::e_strcondition == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_string_ccondition_node(const expression_node<T>* node) 
  |       { 
  |          return node && (expression_node<T>::e_strccondition == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_string_vararg_node(const expression_node<T>* node) 
  |       { 
  |          return node && (expression_node<T>::e_stringvararg == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_genricstring_range_node(const expression_node<T>* node) 
  |       { 
  |          return node && (expression_node<T>::e_strgenrange == node->type()); 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_generally_string_node(const expression_node<T>* node) 
  |       { 
  |          if (node) 
  |          { 
  |             switch (node->type()) 
  |             { 
  |                case expression_node<T>::e_stringvar     : 
  |                case expression_node<T>::e_stringconst   : 
  |                case expression_node<T>::e_stringvarrng  : 
  |                case expression_node<T>::e_cstringvarrng : 
  |                case expression_node<T>::e_strgenrange   : 
  |                case expression_node<T>::e_strass        : 
  |                case expression_node<T>::e_strconcat     : 
  |                case expression_node<T>::e_strfunction   : 
  |                case expression_node<T>::e_strcondition  : 
  |                case expression_node<T>::e_strccondition : 
  |                case expression_node<T>::e_stringvararg  : return true; 
  |                default                                  : return false; 
  |             } 
  |          } 
  |  
  |          return false; 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_loop_node(const expression_node<T>* node) 
  |       { 
  |          if (node) 
  |          { 
  |             switch (node->type()) 
  |             { 
  |                case expression_node<T>::e_for    : 
  |                case expression_node<T>::e_repeat : 
  |                case expression_node<T>::e_while  : return true; 
  |                default                           : return false; 
  |             } 
  |          } 
  |  
  |          return false; 
  |       } 
  |  
  |       template <typename T> 
  |       inline bool is_block_node(const expression_node<T>* node) 
  |       { 
  |          if (node) 
  |          { 
  |             if (is_loop_node(node)) 
  |             { 
  |                return true; 
  |             } 
  |  
  |             switch (node->type()) 
  |             { 
  |                case expression_node<T>::e_conditional : 
  |                case expression_node<T>::e_mswitch     : 
  |                case expression_node<T>::e_switch      : 
  |                case expression_node<T>::e_vararg      : return true; 
  |                default                                : return false; 
  |             } 
  |          } 
  |  
  |          return false; 
  |       } 
  |  
  |       class node_allocator 
  |       { 
  |       public: 
  |  
  |          template <typename ResultNode, typename OpType, typename ExprNode> 
  |          inline expression_node<typename ResultNode::value_type>* allocate(OpType& operation, ExprNode (&branch)[1]) 
  |          { 
  |             expression_node<typename ResultNode::value_type>* result = 
  |                allocate<ResultNode>(operation, branch[0]); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename ResultNode, typename OpType, typename ExprNode> 
  |          inline expression_node<typename ResultNode::value_type>* allocate(OpType& operation, ExprNode (&branch)[2]) 
  |          { 
  |             expression_node<typename ResultNode::value_type>* result = 
  |                allocate<ResultNode>(operation, branch[0], branch[1]); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename ResultNode, typename OpType, typename ExprNode> 
  |          inline expression_node<typename ResultNode::value_type>* allocate(OpType& operation, ExprNode (&branch)[3]) 
  |          { 
  |             expression_node<typename ResultNode::value_type>* result = 
  |                allocate<ResultNode>(operation, branch[0], branch[1], branch[2]); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename ResultNode, typename OpType, typename ExprNode> 
  |          inline expression_node<typename ResultNode::value_type>* allocate(OpType& operation, ExprNode (&branch)[4]) 
  |          { 
  |             expression_node<typename ResultNode::value_type>* result = 
  |                allocate<ResultNode>(operation, branch[0], branch[1], branch[2], branch[3]); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename ResultNode, typename OpType, typename ExprNode> 
  |          inline expression_node<typename ResultNode::value_type>* allocate(OpType& operation, ExprNode (&branch)[5]) 
  |          { 
  |             expression_node<typename ResultNode::value_type>* result = 
  |                allocate<ResultNode>(operation, branch[0],branch[1], branch[2], branch[3], branch[4]); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename ResultNode, typename OpType, typename ExprNode> 
  |          inline expression_node<typename ResultNode::value_type>* allocate(OpType& operation, ExprNode (&branch)[6]) 
  |          { 
  |             expression_node<typename ResultNode::value_type>* result = 
  |                allocate<ResultNode>(operation, branch[0], branch[1], branch[2], branch[3], branch[4], branch[5]); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type> 
  |          inline expression_node<typename node_type::value_type>* allocate() const 
  |          { 
  |             return (new node_type()); 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename Type, 
  |                    typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          inline expression_node<typename node_type::value_type>* allocate(const Sequence<Type,Allocator>& seq) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(seq)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, typename T1> 
  |          inline expression_node<typename node_type::value_type>* allocate(T1& t1) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, typename T1> 
  |          inline expression_node<typename node_type::value_type>* allocate_c(const T1& t1) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2> 
  |          inline expression_node<typename node_type::value_type>* allocate(const T1& t1, const T2& t2) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2> 
  |          inline expression_node<typename node_type::value_type>* allocate_cr(const T1& t1, T2& t2) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2> 
  |          inline expression_node<typename node_type::value_type>* allocate_rc(T1& t1, const T2& t2) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2> 
  |          inline expression_node<typename node_type::value_type>* allocate_rr(T1& t1, T2& t2) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2> 
  |          inline expression_node<typename node_type::value_type>* allocate_tt(T1 t1, T2 t2) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, typename T3> 
  |          inline expression_node<typename node_type::value_type>* allocate_ttt(T1 t1, T2 t2, T3 t3) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, typename T3, typename T4> 
  |          inline expression_node<typename node_type::value_type>* allocate_tttt(T1 t1, T2 t2, T3 t3, T4 t4) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3, t4)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, typename T3> 
  |          inline expression_node<typename node_type::value_type>* allocate_rrr(T1& t1, T2& t2, T3& t3) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, typename T3, typename T4> 
  |          inline expression_node<typename node_type::value_type>* allocate_rrrr(T1& t1, T2& t2, T3& t3, T4& t4) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3, t4)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, typename T3, typename T4, typename T5> 
  |          inline expression_node<typename node_type::value_type>* allocate_rrrrr(T1& t1, T2& t2, T3& t3, T4& t4, T5& t5) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3, t4, t5)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, typename T3> 
  |          inline expression_node<typename node_type::value_type>* allocate(const T1& t1, const T2& t2, 
  |                                                                           const T3& t3) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, 
  |                    typename T3, typename T4> 
  |          inline expression_node<typename node_type::value_type>* allocate(const T1& t1, const T2& t2, 
  |                                                                           const T3& t3, const T4& t4) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3, t4)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, 
  |                    typename T3, typename T4, typename T5> 
  |          inline expression_node<typename node_type::value_type>* allocate(const T1& t1, const T2& t2, 
  |                                                                           const T3& t3, const T4& t4, 
  |                                                                           const T5& t5) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3, t4, t5)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, 
  |                    typename T3, typename T4, typename T5, typename T6> 
  |          inline expression_node<typename node_type::value_type>* allocate(const T1& t1, const T2& t2, 
  |                                                                           const T3& t3, const T4& t4, 
  |                                                                           const T5& t5, const T6& t6) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3, t4, t5, t6)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, 
  |                    typename T3, typename T4, 
  |                    typename T5, typename T6, typename T7> 
  |          inline expression_node<typename node_type::value_type>* allocate(const T1& t1, const T2& t2, 
  |                                                                           const T3& t3, const T4& t4, 
  |                                                                           const T5& t5, const T6& t6, 
  |                                                                           const T7& t7) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3, t4, t5, t6, t7)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, 
  |                    typename T3, typename T4, 
  |                    typename T5, typename T6, 
  |                    typename T7, typename T8> 
  |          inline expression_node<typename node_type::value_type>* allocate(const T1& t1, const T2& t2, 
  |                                                                           const T3& t3, const T4& t4, 
  |                                                                           const T5& t5, const T6& t6, 
  |                                                                           const T7& t7, const T8& t8) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3, t4, t5, t6, t7, t8)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, 
  |                    typename T3, typename T4, 
  |                    typename T5, typename T6, 
  |                    typename T7, typename T8, typename T9> 
  |          inline expression_node<typename node_type::value_type>* allocate(const T1& t1, const T2& t2, 
  |                                                                           const T3& t3, const T4& t4, 
  |                                                                           const T5& t5, const T6& t6, 
  |                                                                           const T7& t7, const T8& t8, 
  |                                                                           const T9& t9) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3, t4, t5, t6, t7, t8, t9)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, 
  |                    typename T3, typename T4, 
  |                    typename T5, typename T6, 
  |                    typename T7, typename T8, 
  |                    typename T9, typename T10> 
  |          inline expression_node<typename node_type::value_type>* allocate(const T1& t1, const  T2&  t2, 
  |                                                                           const T3& t3, const  T4&  t4, 
  |                                                                           const T5& t5, const  T6&  t6, 
  |                                                                           const T7& t7, const  T8&  t8, 
  |                                                                           const T9& t9, const T10& t10) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3, t4, t5, t6, t7, t8, t9, t10)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, typename T3> 
  |          inline expression_node<typename node_type::value_type>* allocate_type(T1 t1, T2 t2, T3 t3) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, 
  |                    typename T3, typename T4> 
  |          inline expression_node<typename node_type::value_type>* allocate_type(T1 t1, T2 t2, 
  |                                                                                T3 t3, T4 t4) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3, t4)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, 
  |                    typename T3, typename T4, 
  |                    typename T5> 
  |          inline expression_node<typename node_type::value_type>* allocate_type(T1 t1, T2 t2, 
  |                                                                                T3 t3, T4 t4, 
  |                                                                                T5 t5) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3, t4, t5)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, 
  |                    typename T3, typename T4, 
  |                    typename T5, typename T6> 
  |          inline expression_node<typename node_type::value_type>* allocate_type(T1 t1, T2 t2, 
  |                                                                                T3 t3, T4 t4, 
  |                                                                                T5 t5, T6 t6) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3, t4, t5, t6)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename node_type, 
  |                    typename T1, typename T2, 
  |                    typename T3, typename T4, 
  |                    typename T5, typename T6, typename T7> 
  |          inline expression_node<typename node_type::value_type>* allocate_type(T1 t1, T2 t2, 
  |                                                                                T3 t3, T4 t4, 
  |                                                                                T5 t5, T6 t6, 
  |                                                                                T7 t7) const 
  |          { 
  |             expression_node<typename node_type::value_type>* 
  |             result = (new node_type(t1, t2, t3, t4, t5, t6, t7)); 
  |             result->node_depth(); 
  |             return result; 
  |          } 
  |  
  |          template <typename T> 
  |          void inline free(expression_node<T>*& e) const 
  |          { 
  |             exprtk_debug(("node_allocator::free() - deleting expression_node " 
  |                           "type: %03d addr: %p\n", 
  |                           static_cast<int>(e->type()), 
  |                           reinterpret_cast<void*>(e))); 
  |             delete e; 
  |             e = 0; 
  |          } 
  |       }; 
  |  
  |       inline void load_operations_map(std::multimap<std::string,details::base_operation_t,details::ilesscompare>& m) 
  |       { 
  |          #define register_op(Symbol, Type, Args)                                             \ 
  |          m.insert(std::make_pair(std::string(Symbol),details::base_operation_t(Type,Args))); \ 
  |  
  |          register_op("abs"       , e_abs     , 1) 
  |          register_op("acos"      , e_acos    , 1) 
  |          register_op("acosh"     , e_acosh   , 1) 
  |          register_op("asin"      , e_asin    , 1) 
  |          register_op("asinh"     , e_asinh   , 1) 
  |          register_op("atan"      , e_atan    , 1) 
  |          register_op("atanh"     , e_atanh   , 1) 
  |          register_op("ceil"      , e_ceil    , 1) 
  |          register_op("cos"       , e_cos     , 1) 
  |          register_op("cosh"      , e_cosh    , 1) 
  |          register_op("exp"       , e_exp     , 1) 
  |          register_op("expm1"     , e_expm1   , 1) 
  |          register_op("floor"     , e_floor   , 1) 
  |          register_op("log"       , e_log     , 1) 
  |          register_op("log10"     , e_log10   , 1) 
  |          register_op("log2"      , e_log2    , 1) 
  |          register_op("log1p"     , e_log1p   , 1) 
  |          register_op("round"     , e_round   , 1) 
  |          register_op("sin"       , e_sin     , 1) 
  |          register_op("sinc"      , e_sinc    , 1) 
  |          register_op("sinh"      , e_sinh    , 1) 
  |          register_op("sec"       , e_sec     , 1) 
  |          register_op("csc"       , e_csc     , 1) 
  |          register_op("sqrt"      , e_sqrt    , 1) 
  |          register_op("tan"       , e_tan     , 1) 
  |          register_op("tanh"      , e_tanh    , 1) 
  |          register_op("cot"       , e_cot     , 1) 
  |          register_op("rad2deg"   , e_r2d     , 1) 
  |          register_op("deg2rad"   , e_d2r     , 1) 
  |          register_op("deg2grad"  , e_d2g     , 1) 
  |          register_op("grad2deg"  , e_g2d     , 1) 
  |          register_op("sgn"       , e_sgn     , 1) 
  |          register_op("not"       , e_notl    , 1) 
  |          register_op("erf"       , e_erf     , 1) 
  |          register_op("erfc"      , e_erfc    , 1) 
  |          register_op("ncdf"      , e_ncdf    , 1) 
  |          register_op("frac"      , e_frac    , 1) 
  |          register_op("trunc"     , e_trunc   , 1) 
  |          register_op("atan2"     , e_atan2   , 2) 
  |          register_op("mod"       , e_mod     , 2) 
  |          register_op("logn"      , e_logn    , 2) 
  |          register_op("pow"       , e_pow     , 2) 
  |          register_op("root"      , e_root    , 2) 
  |          register_op("roundn"    , e_roundn  , 2) 
  |          register_op("equal"     , e_equal   , 2) 
  |          register_op("not_equal" , e_nequal  , 2) 
  |          register_op("hypot"     , e_hypot   , 2) 
  |          register_op("shr"       , e_shr     , 2) 
  |          register_op("shl"       , e_shl     , 2) 
  |          register_op("clamp"     , e_clamp   , 3) 
  |          register_op("iclamp"    , e_iclamp  , 3) 
  |          register_op("inrange"   , e_inrange , 3) 
  |          #undef register_op 
  |       } 
  |  
  |    } // namespace details 
  |  
  |    class function_traits 
  |    { 
  |    public: 
  |  
  |       function_traits() 
  |       : allow_zero_parameters_(false) 
  |       , has_side_effects_(true) 
  |       , min_num_args_(0) 
  |       , max_num_args_(std::numeric_limits<std::size_t>::max()) 
  |       {} 
  |  
  |       inline bool& allow_zero_parameters() 
  |       { 
  |          return allow_zero_parameters_; 
  |       } 
  |  
  |       inline bool& has_side_effects() 
  |       { 
  |          return has_side_effects_; 
  |       } 
  |  
  |       std::size_t& min_num_args() 
  |       { 
  |          return min_num_args_; 
  |       } 
  |  
  |       std::size_t& max_num_args() 
  |       { 
  |          return max_num_args_; 
  |       } 
  |  
  |    private: 
  |  
  |       bool allow_zero_parameters_; 
  |       bool has_side_effects_; 
  |       std::size_t min_num_args_; 
  |       std::size_t max_num_args_; 
  |    }; 
  |  
  |    template <typename FunctionType> 
  |    void enable_zero_parameters(FunctionType& func) 
  |    { 
  |       func.allow_zero_parameters() = true; 
  |  
  |       if (0 != func.min_num_args()) 
  |       { 
  |          func.min_num_args() = 0; 
  |       } 
  |    } 
  |  
  |    template <typename FunctionType> 
  |    void disable_zero_parameters(FunctionType& func) 
  |    { 
  |       func.allow_zero_parameters() = false; 
  |    } 
  |  
  |    template <typename FunctionType> 
  |    void enable_has_side_effects(FunctionType& func) 
  |    { 
  |       func.has_side_effects() = true; 
  |    } 
  |  
  |    template <typename FunctionType> 
  |    void disable_has_side_effects(FunctionType& func) 
  |    { 
  |       func.has_side_effects() = false; 
  |    } 
  |  
  |    template <typename FunctionType> 
  |    void set_min_num_args(FunctionType& func, const std::size_t& num_args) 
  |    { 
  |       func.min_num_args() = num_args; 
  |  
  |       if ((0 != func.min_num_args()) && func.allow_zero_parameters()) 
  |          func.allow_zero_parameters() = false; 
  |    } 
  |  
  |    template <typename FunctionType> 
  |    void set_max_num_args(FunctionType& func, const std::size_t& num_args) 
  |    { 
  |       func.max_num_args() = num_args; 
  |    } 
  |  
  |    template <typename T> 
  |    class ifunction : public function_traits 
  |    { 
  |    public: 
  |  
  |       explicit ifunction(const std::size_t& pc) 
  |       : param_count(pc) 
  |       {} 
  |  
  |       virtual ~ifunction() 
  |       {} 
  |  
  |       #define empty_method_body(N)                   \ 
  |       {                                              \ 
  |          exprtk_debug(("ifunction::operator() - Operator(" #N ") has not been overridden\n")); \ 
  |          return std::numeric_limits<T>::quiet_NaN(); \ 
  |       }                                              \ 
  |  
  |       inline virtual T operator() () 
  |       empty_method_body(0) 
  |  
  |       inline virtual T operator() (const T&) 
  |       empty_method_body(1) 
  |  
  |       inline virtual T operator() (const T&,const T&) 
  |       empty_method_body(2) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&) 
  |       empty_method_body(3) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&, const T&) 
  |       empty_method_body(4) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&, const T&, const T&) 
  |       empty_method_body(5) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&, const T&, const T&, const T&) 
  |       empty_method_body(6) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&, const T&, const T&, const T&, const T&) 
  |       empty_method_body(7) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&) 
  |       empty_method_body(8) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&) 
  |       empty_method_body(9) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&) 
  |       empty_method_body(10) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, 
  |                                    const T&) 
  |       empty_method_body(11) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, 
  |                                    const T&, const T&) 
  |       empty_method_body(12) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, 
  |                                    const T&, const T&, const T&) 
  |       empty_method_body(13) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, 
  |                                    const T&, const T&, const T&, const T&) 
  |       empty_method_body(14) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, 
  |                                    const T&, const T&, const T&, const T&, const T&) 
  |       empty_method_body(15) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, 
  |                                    const T&, const T&, const T&, const T&, const T&, const T&) 
  |       empty_method_body(16) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, 
  |                                    const T&, const T&, const T&, const T&, const T&, const T&, const T&) 
  |       empty_method_body(17) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, 
  |                                    const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&) 
  |       empty_method_body(18) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, 
  |                                    const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&) 
  |       empty_method_body(19) 
  |  
  |       inline virtual T operator() (const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, 
  |                                    const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&, const T&) 
  |       empty_method_body(20) 
  |  
  |       #undef empty_method_body 
  |  
  |       std::size_t param_count; 
  |    }; 
  |  
  |    template <typename T> 
  |    class ivararg_function : public function_traits 
  |    { 
  |    public: 
  |  
  |       virtual ~ivararg_function() 
  |       {} 
  |  
  |       inline virtual T operator() (const std::vector<T>&) 
  |       { 
  |          exprtk_debug(("ivararg_function::operator() - Operator has not been overridden\n")); 
  |          return std::numeric_limits<T>::quiet_NaN(); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class igeneric_function : public function_traits 
  |    { 
  |    public: 
  |  
  |       enum return_type 
  |       { 
  |          e_rtrn_scalar   = 0, 
  |          e_rtrn_string   = 1, 
  |          e_rtrn_overload = 2 
  |       }; 
  |  
  |       typedef T type; 
  |       typedef type_store<T> generic_type; 
  |       typedef typename generic_type::parameter_list parameter_list_t; 
  |  
  |       explicit igeneric_function(const std::string& param_seq = "", const return_type rtr_type = e_rtrn_scalar) 
  |       : parameter_sequence(param_seq) 
  |       , rtrn_type(rtr_type) 
  |       {} 
  |  
  |       virtual ~igeneric_function() 
  |       {} 
  |  
  |       #define igeneric_function_empty_body(N)        \ 
  |       {                                              \ 
  |          exprtk_debug(("igeneric_function::operator() - Operator(" #N ") has not been overridden\n")); \ 
  |          return std::numeric_limits<T>::quiet_NaN(); \ 
  |       }                                              \ 
  |  
  |       // f(i_0,i_1,....,i_N) --> Scalar 
  |       inline virtual T operator() (parameter_list_t) 
  |       igeneric_function_empty_body(1) 
  |  
  |       // f(i_0,i_1,....,i_N) --> String 
  |       inline virtual T operator() (std::string&, parameter_list_t) 
  |       igeneric_function_empty_body(2) 
  |  
  |       // f(psi,i_0,i_1,....,i_N) --> Scalar 
  |       inline virtual T operator() (const std::size_t&, parameter_list_t) 
  |       igeneric_function_empty_body(3) 
  |  
  |       // f(psi,i_0,i_1,....,i_N) --> String 
  |       inline virtual T operator() (const std::size_t&, std::string&, parameter_list_t) 
  |       igeneric_function_empty_body(4) 
  |  
  |       #undef igeneric_function_empty_body 
  |  
  |       std::string parameter_sequence; 
  |       return_type rtrn_type; 
  |    }; 
  |  
  |    #ifndef exprtk_disable_string_capabilities 
  |    template <typename T> 
  |    class stringvar_base 
  |    { 
  |    public: 
  |  
  |       typedef typename details::stringvar_node<T> stringvar_node_t; 
  |  
  |       stringvar_base(const std::string& name, stringvar_node_t* svn) 
  |       : name_(name) 
  |       , string_varnode_(svn) 
  |       {} 
  |  
  |       bool valid() const 
  |       { 
  |          return !name_.empty() && (0 != string_varnode_); 
  |       } 
  |  
  |       std::string name() const 
  |       { 
  |          assert(string_varnode_); 
  |          return name_; 
  |       } 
  |  
  |       void rebase(std::string& s) 
  |       { 
  |          assert(string_varnode_); 
  |          string_varnode_->rebase(s); 
  |       } 
  |  
  |    private: 
  |  
  |       std::string name_; 
  |       stringvar_node_t* string_varnode_; 
  |    }; 
  |    #endif 
  |  
  |    template <typename T> class parser; 
  |    template <typename T> class expression_helper; 
  |  
  |    template <typename T> 
  |    class symbol_table 
  |    { 
  |    public: 
  |  
  |      enum symtab_mutability_type 
  |      { 
  |        e_unknown   = 0, 
  |        e_mutable   = 1, 
  |        e_immutable = 2 
  |      }; 
  |  
  |      typedef T (*ff00_functor)(); 
  |      typedef T (*ff01_functor)(T); 
  |      typedef T (*ff02_functor)(T, T); 
  |      typedef T (*ff03_functor)(T, T, T); 
  |      typedef T (*ff04_functor)(T, T, T, T); 
  |      typedef T (*ff05_functor)(T, T, T, T, T); 
  |      typedef T (*ff06_functor)(T, T, T, T, T, T); 
  |      typedef T (*ff07_functor)(T, T, T, T, T, T, T); 
  |      typedef T (*ff08_functor)(T, T, T, T, T, T, T, T); 
  |      typedef T (*ff09_functor)(T, T, T, T, T, T, T, T, T); 
  |      typedef T (*ff10_functor)(T, T, T, T, T, T, T, T, T, T); 
  |      typedef T (*ff11_functor)(T, T, T, T, T, T, T, T, T, T, T); 
  |      typedef T (*ff12_functor)(T, T, T, T, T, T, T, T, T, T, T, T); 
  |      typedef T (*ff13_functor)(T, T, T, T, T, T, T, T, T, T, T, T, T); 
  |      typedef T (*ff14_functor)(T, T, T, T, T, T, T, T, T, T, T, T, T, T); 
  |      typedef T (*ff15_functor)(T, T, T, T, T, T, T, T, T, T, T, T, T, T, T); 
  |  
  |    protected: 
  |  
  |        struct freefunc00 exprtk_final : public exprtk::ifunction<T> 
  |        { 
  |           using exprtk::ifunction<T>::operator(); 
  |  
  |           explicit freefunc00(ff00_functor ff) : exprtk::ifunction<T>(0), f(ff) {} 
  |           inline T operator() () exprtk_override 
  |           { return f(); } 
  |           ff00_functor f; 
  |        }; 
  |  
  |       struct freefunc01 exprtk_final : public exprtk::ifunction<T> 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          explicit freefunc01(ff01_functor ff) : exprtk::ifunction<T>(1), f(ff) {} 
  |          inline T operator() (const T& v0) exprtk_override 
  |          { return f(v0); } 
  |          ff01_functor f; 
  |       }; 
  |  
  |       struct freefunc02 exprtk_final : public exprtk::ifunction<T> 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          explicit freefunc02(ff02_functor ff) : exprtk::ifunction<T>(2), f(ff) {} 
  |          inline T operator() (const T& v0, const T& v1) exprtk_override 
  |          { return f(v0, v1); } 
  |          ff02_functor f; 
  |       }; 
  |  
  |       struct freefunc03 exprtk_final : public exprtk::ifunction<T> 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          explicit freefunc03(ff03_functor ff) : exprtk::ifunction<T>(3), f(ff) {} 
  |          inline T operator() (const T& v0, const T& v1, const T& v2) exprtk_override 
  |          { return f(v0, v1, v2); } 
  |          ff03_functor f; 
  |       }; 
  |  
  |       struct freefunc04 exprtk_final : public exprtk::ifunction<T> 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          explicit freefunc04(ff04_functor ff) : exprtk::ifunction<T>(4), f(ff) {} 
  |          inline T operator() (const T& v0, const T& v1, const T& v2, const T& v3) exprtk_override 
  |          { return f(v0, v1, v2, v3); } 
  |          ff04_functor f; 
  |       }; 
  |  
  |       struct freefunc05 : public exprtk::ifunction<T> 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          explicit freefunc05(ff05_functor ff) : exprtk::ifunction<T>(5), f(ff) {} 
  |          inline T operator() (const T& v0, const T& v1, const T& v2, const T& v3, const T& v4) exprtk_override 
  |          { return f(v0, v1, v2, v3, v4); } 
  |          ff05_functor f; 
  |       }; 
  |  
  |       struct freefunc06 exprtk_final : public exprtk::ifunction<T> 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          explicit freefunc06(ff06_functor ff) : exprtk::ifunction<T>(6), f(ff) {} 
  |          inline T operator() (const T& v0, const T& v1, const T& v2, const T& v3, const T& v4, const T& v5) exprtk_override 
  |          { return f(v0, v1, v2, v3, v4, v5); } 
  |          ff06_functor f; 
  |       }; 
  |  
  |       struct freefunc07 exprtk_final : public exprtk::ifunction<T> 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          explicit freefunc07(ff07_functor ff) : exprtk::ifunction<T>(7), f(ff) {} 
  |          inline T operator() (const T& v0, const T& v1, const T& v2, const T& v3, const T& v4, 
  |                               const T& v5, const T& v6) exprtk_override 
  |          { return f(v0, v1, v2, v3, v4, v5, v6); } 
  |          ff07_functor f; 
  |       }; 
  |  
  |       struct freefunc08 exprtk_final : public exprtk::ifunction<T> 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          explicit freefunc08(ff08_functor ff) : exprtk::ifunction<T>(8), f(ff) {} 
  |          inline T operator() (const T& v0, const T& v1, const T& v2, const T& v3, const T& v4, 
  |                               const T& v5, const T& v6, const T& v7) exprtk_override 
  |          { return f(v0, v1, v2, v3, v4, v5, v6, v7); } 
  |          ff08_functor f; 
  |       }; 
  |  
  |       struct freefunc09 exprtk_final : public exprtk::ifunction<T> 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          explicit freefunc09(ff09_functor ff) : exprtk::ifunction<T>(9), f(ff) {} 
  |          inline T operator() (const T& v0, const T& v1, const T& v2, const T& v3, const T& v4, 
  |                               const T& v5, const T& v6, const T& v7, const T& v8) exprtk_override 
  |          { return f(v0, v1, v2, v3, v4, v5, v6, v7, v8); } 
  |          ff09_functor f; 
  |       }; 
  |  
  |       struct freefunc10 exprtk_final : public exprtk::ifunction<T> 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          explicit freefunc10(ff10_functor ff) : exprtk::ifunction<T>(10), f(ff) {} 
  |          inline T operator() (const T& v0, const T& v1, const T& v2, const T& v3, const T& v4, 
  |                               const T& v5, const T& v6, const T& v7, const T& v8, const T& v9) exprtk_override 
  |          { return f(v0, v1, v2, v3, v4, v5, v6, v7, v8, v9); } 
  |          ff10_functor f; 
  |       }; 
  |  
  |       struct freefunc11 exprtk_final : public exprtk::ifunction<T> 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          explicit freefunc11(ff11_functor ff) : exprtk::ifunction<T>(11), f(ff) {} 
  |          inline T operator() (const T& v0, const T& v1, const T& v2, const T& v3, const T& v4, 
  |                               const T& v5, const T& v6, const T& v7, const T& v8, const T& v9, const T& v10) exprtk_override 
  |          { return f(v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, v10); } 
  |          ff11_functor f; 
  |       }; 
  |  
  |       struct freefunc12 exprtk_final : public exprtk::ifunction<T> 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          explicit freefunc12(ff12_functor ff) : exprtk::ifunction<T>(12), f(ff) {} 
  |          inline T operator() (const T& v00, const T& v01, const T& v02, const T& v03, const T& v04, 
  |                               const T& v05, const T& v06, const T& v07, const T& v08, const T& v09, 
  |                               const T& v10, const T& v11) exprtk_override 
  |          { return f(v00, v01, v02, v03, v04, v05, v06, v07, v08, v09, v10, v11); } 
  |          ff12_functor f; 
  |       }; 
  |  
  |       struct freefunc13 exprtk_final : public exprtk::ifunction<T> 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          explicit freefunc13(ff13_functor ff) : exprtk::ifunction<T>(13), f(ff) {} 
  |          inline T operator() (const T& v00, const T& v01, const T& v02, const T& v03, const T& v04, 
  |                               const T& v05, const T& v06, const T& v07, const T& v08, const T& v09, 
  |                               const T& v10, const T& v11, const T& v12) exprtk_override 
  |          { return f(v00, v01, v02, v03, v04, v05, v06, v07, v08, v09, v10, v11, v12); } 
  |          ff13_functor f; 
  |       }; 
  |  
  |       struct freefunc14 exprtk_final : public exprtk::ifunction<T> 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          explicit freefunc14(ff14_functor ff) : exprtk::ifunction<T>(14), f(ff) {} 
  |          inline T operator() (const T& v00, const T& v01, const T& v02, const T& v03, const T& v04, 
  |                               const T& v05, const T& v06, const T& v07, const T& v08, const T& v09, 
  |                               const T& v10, const T& v11, const T& v12, const T& v13) exprtk_override 
  |          { return f(v00, v01, v02, v03, v04, v05, v06, v07, v08, v09, v10, v11, v12, v13); } 
  |          ff14_functor f; 
  |       }; 
  |  
  |       struct freefunc15 exprtk_final : public exprtk::ifunction<T> 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          explicit freefunc15(ff15_functor ff) : exprtk::ifunction<T>(15), f(ff) {} 
  |          inline T operator() (const T& v00, const T& v01, const T& v02, const T& v03, const T& v04, 
  |                               const T& v05, const T& v06, const T& v07, const T& v08, const T& v09, 
  |                               const T& v10, const T& v11, const T& v12, const T& v13, const T& v14) exprtk_override 
  |          { return f(v00, v01, v02, v03, v04, v05, v06, v07, v08, v09, v10, v11, v12, v13, v14); } 
  |          ff15_functor f; 
  |       }; 
  |  
  |       template <typename Type, typename RawType> 
  |       struct type_store 
  |       { 
  |          typedef details::expression_node<T>*        expression_ptr; 
  |          typedef typename details::variable_node<T>  variable_node_t; 
  |          typedef ifunction<T>                        ifunction_t; 
  |          typedef ivararg_function<T>                 ivararg_function_t; 
  |          typedef igeneric_function<T>                igeneric_function_t; 
  |          typedef details::vector_holder<T>           vector_t; 
  |          #ifndef exprtk_disable_string_capabilities 
  |          typedef typename details::stringvar_node<T> stringvar_node_t; 
  |          #endif 
  |  
  |          typedef Type type_t; 
  |          typedef type_t* type_ptr; 
  |          typedef std::pair<bool,type_ptr> type_pair_t; 
  |          typedef std::map<std::string,type_pair_t,details::ilesscompare> type_map_t; 
  |          typedef typename type_map_t::iterator tm_itr_t; 
  |          typedef typename type_map_t::const_iterator tm_const_itr_t; 
  |  
  |          enum { lut_size = 256 }; 
  |  
  |          type_map_t  map; 
  |          std::size_t size; 
  |  
  |          type_store() 
  |          : size(0) 
  |          {} 
  |  
  |          struct deleter 
  |          { 
  |             #define exprtk_define_process(Type)                  \ 
  |             static inline void process(std::pair<bool,Type*>& n) \ 
  |             {                                                    \ 
  |                delete n.second;                                  \ 
  |             }                                                    \ 
  |  
  |             exprtk_define_process(variable_node_t ) 
  |             exprtk_define_process(vector_t        ) 
  |             #ifndef exprtk_disable_string_capabilities 
  |             exprtk_define_process(stringvar_node_t) 
  |             #endif 
  |  
  |             #undef exprtk_define_process 
  |  
  |             template <typename DeleteType> 
  |             static inline void process(std::pair<bool,DeleteType*>&) 
  |             {} 
  |          }; 
  |  
  |          inline bool symbol_exists(const std::string& symbol_name) const 
  |          { 
  |             if (symbol_name.empty()) 
  |                return false; 
  |             else if (map.end() != map.find(symbol_name)) 
  |                return true; 
  |             else 
  |                return false; 
  |          } 
  |  
  |          template <typename PtrType> 
  |          inline std::string entity_name(const PtrType& ptr) const 
  |          { 
  |             if (map.empty()) 
  |                return std::string(); 
  |  
  |             tm_const_itr_t itr = map.begin(); 
  |  
  |             while (map.end() != itr) 
  |             { 
  |                if (itr->second.second == ptr) 
  |                { 
  |                   return itr->first; 
  |                } 
  |                else 
  |                   ++itr; 
  |             } 
  |  
  |             return std::string(); 
  |          } 
  |  
  |          inline bool is_constant(const std::string& symbol_name) const 
  |          { 
  |             if (symbol_name.empty()) 
  |                return false; 
  |             else 
  |             { 
  |                const tm_const_itr_t itr = map.find(symbol_name); 
  |  
  |                if (map.end() == itr) 
  |                   return false; 
  |                else 
  |                   return (*itr).second.first; 
  |             } 
  |          } 
  |  
  |          template <typename Tie, typename RType> 
  |          inline bool add_impl(const std::string& symbol_name, RType t, const bool is_const) 
  |          { 
  |             if (symbol_name.size() > 1) 
  |             { 
  |                for (std::size_t i = 0; i < details::reserved_symbols_size; ++i) 
  |                { 
  |                   if (details::imatch(symbol_name, details::reserved_symbols[i])) 
  |                   { 
  |                      return false; 
  |                   } 
  |                } 
  |             } 
  |  
  |             const tm_itr_t itr = map.find(symbol_name); 
  |  
  |             if (map.end() == itr) 
  |             { 
  |                map[symbol_name] = Tie::make(t,is_const); 
  |                ++size; 
  |             } 
  |  
  |             return true; 
  |          } 
  |  
  |          struct tie_array 
  |          { 
  |             static inline std::pair<bool,vector_t*> make(std::pair<T*,std::size_t> v, const bool is_const = false) 
  |             { 
  |                return std::make_pair(is_const, new vector_t(v.first, v.second)); 
  |             } 
  |          }; 
  |  
  |          struct tie_stdvec 
  |          { 
  |             template <typename Allocator> 
  |             static inline std::pair<bool,vector_t*> make(std::vector<T,Allocator>& v, const bool is_const = false) 
  |             { 
  |                return std::make_pair(is_const, new vector_t(v)); 
  |             } 
  |          }; 
  |  
  |          struct tie_vecview 
  |          { 
  |             static inline std::pair<bool,vector_t*> make(exprtk::vector_view<T>& v, const bool is_const = false) 
  |             { 
  |                return std::make_pair(is_const, new vector_t(v)); 
  |             } 
  |          }; 
  |  
  |          struct tie_stddeq 
  |          { 
  |             template <typename Allocator> 
  |             static inline std::pair<bool,vector_t*> make(std::deque<T,Allocator>& v, const bool is_const = false) 
  |             { 
  |                return std::make_pair(is_const, new vector_t(v)); 
  |             } 
  |          }; 
  |  
  |          template <std::size_t v_size> 
  |          inline bool add(const std::string& symbol_name, T (&v)[v_size], const bool is_const = false) 
  |          { 
  |             return add_impl<tie_array,std::pair<T*,std::size_t> > 
  |                       (symbol_name, std::make_pair(v,v_size), is_const); 
  |          } 
  |  
  |          inline bool add(const std::string& symbol_name, T* v, const std::size_t v_size, const bool is_const = false) 
  |          { 
  |             return add_impl<tie_array,std::pair<T*,std::size_t> > 
  |                      (symbol_name, std::make_pair(v,v_size), is_const); 
  |          } 
  |  
  |          template <typename Allocator> 
  |          inline bool add(const std::string& symbol_name, std::vector<T,Allocator>& v, const bool is_const = false) 
  |          { 
  |             return add_impl<tie_stdvec,std::vector<T,Allocator>&> 
  |                       (symbol_name, v, is_const); 
  |          } 
  |  
  |          inline bool add(const std::string& symbol_name, exprtk::vector_view<T>& v, const bool is_const = false) 
  |          { 
  |             return add_impl<tie_vecview,exprtk::vector_view<T>&> 
  |                       (symbol_name, v, is_const); 
  |          } 
  |  
  |          template <typename Allocator> 
  |          inline bool add(const std::string& symbol_name, std::deque<T,Allocator>& v, const bool is_const = false) 
  |          { 
  |             return add_impl<tie_stddeq,std::deque<T,Allocator>&> 
  |                       (symbol_name, v, is_const); 
  |          } 
  |  
  |          inline bool add(const std::string& symbol_name, RawType& t_, const bool is_const = false) 
  |          { 
  |             struct tie 
  |             { 
  |                static inline std::pair<bool,variable_node_t*> make(T& t, const bool is_constant = false) 
  |                { 
  |                   return std::make_pair(is_constant, new variable_node_t(t)); 
  |                } 
  |  
  |                #ifndef exprtk_disable_string_capabilities 
  |                static inline std::pair<bool,stringvar_node_t*> make(std::string& t, const bool is_constant = false) 
  |                { 
  |                   return std::make_pair(is_constant, new stringvar_node_t(t)); 
  |                } 
  |                #endif 
  |  
  |                static inline std::pair<bool,function_t*> make(function_t& t, const bool is_constant = false) 
  |                { 
  |                   return std::make_pair(is_constant,&t); 
  |                } 
  |  
  |                static inline std::pair<bool,vararg_function_t*> make(vararg_function_t& t, const bool is_constant = false) 
  |                { 
  |                   return std::make_pair(is_constant,&t); 
  |                } 
  |  
  |                static inline std::pair<bool,generic_function_t*> make(generic_function_t& t, const bool is_constant = false) 
  |                { 
  |                   return std::make_pair(is_constant,&t); 
  |                } 
  |             }; 
  |  
  |             const tm_itr_t itr = map.find(symbol_name); 
  |  
  |             if (map.end() == itr) 
  |             { 
  |                map[symbol_name] = tie::make(t_,is_const); 
  |                ++size; 
  |             } 
  |  
  |             return true; 
  |          } 
  |  
  |          inline type_ptr get(const std::string& symbol_name) const 
  |          { 
  |             const tm_const_itr_t itr = map.find(symbol_name); 
  |  
  |             if (map.end() == itr) 
  |                return reinterpret_cast<type_ptr>(0); 
  |             else 
  |                return itr->second.second; 
  |          } 
  |  
  |          template <typename TType, typename TRawType, typename PtrType> 
  |          struct ptr_match 
  |          { 
  |             static inline bool test(const PtrType, const void*) 
  |             { 
  |                return false; 
  |             } 
  |          }; 
  |  
  |          template <typename TType, typename TRawType> 
  |          struct ptr_match<TType,TRawType,variable_node_t*> 
  |          { 
  |             static inline bool test(const variable_node_t* p, const void* ptr) 
  |             { 
  |                exprtk_debug(("ptr_match::test() - %p <--> %p\n", reinterpret_cast<const void*>(&(p->ref())), ptr)); 
  |                return (&(p->ref()) == ptr); 
  |             } 
  |          }; 
  |  
  |          inline type_ptr get_from_varptr(const void* ptr) const 
  |          { 
  |             tm_const_itr_t itr = map.begin(); 
  |  
  |             while (map.end() != itr) 
  |             { 
  |                type_ptr ret_ptr = itr->second.second; 
  |  
  |                if (ptr_match<Type,RawType,type_ptr>::test(ret_ptr,ptr)) 
  |                { 
  |                   return ret_ptr; 
  |                } 
  |  
  |                ++itr; 
  |             } 
  |  
  |             return type_ptr(0); 
  |          } 
  |  
  |          inline bool remove(const std::string& symbol_name, const bool delete_node = true) 
  |          { 
  |             const tm_itr_t itr = map.find(symbol_name); 
  |  
  |             if (map.end() != itr) 
  |             { 
  |                if (delete_node) 
  |                { 
  |                   deleter::process((*itr).second); 
  |                } 
  |  
  |                map.erase(itr); 
  |                --size; 
  |  
  |                return true; 
  |             } 
  |             else 
  |                return false; 
  |          } 
  |  
  |          inline RawType& type_ref(const std::string& symbol_name) 
  |          { 
  |             struct init_type 
  |             { 
  |                static inline double set(double)           { return (0.0);           } 
  |                static inline double set(long double)      { return (0.0);           } 
  |                static inline float  set(float)            { return (0.0f);          } 
  |                static inline std::string set(std::string) { return std::string(""); } 
  |             }; 
  |  
  |             static RawType null_type = init_type::set(RawType()); 
  |  
  |             const tm_const_itr_t itr = map.find(symbol_name); 
  |  
  |             if (map.end() == itr) 
  |                return null_type; 
  |             else 
  |                return itr->second.second->ref(); 
  |          } 
  |  
  |          inline void clear(const bool delete_node = true) 
  |          { 
  |             if (!map.empty()) 
  |             { 
  |                if (delete_node) 
  |                { 
  |                   tm_itr_t itr = map.begin(); 
  |                   tm_itr_t end = map.end  (); 
  |  
  |                   while (end != itr) 
  |                   { 
  |                      deleter::process((*itr).second); 
  |                      ++itr; 
  |                   } 
  |                } 
  |  
  |                map.clear(); 
  |             } 
  |  
  |             size = 0; 
  |          } 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          inline std::size_t get_list(Sequence<std::pair<std::string,RawType>,Allocator>& list) const 
  |          { 
  |             std::size_t count = 0; 
  |  
  |             if (!map.empty()) 
  |             { 
  |                tm_const_itr_t itr = map.begin(); 
  |                tm_const_itr_t end = map.end  (); 
  |  
  |                while (end != itr) 
  |                { 
  |                   list.push_back(std::make_pair((*itr).first,itr->second.second->ref())); 
  |                   ++itr; 
  |                   ++count; 
  |                } 
  |             } 
  |  
  |             return count; 
  |          } 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          inline std::size_t get_list(Sequence<std::string,Allocator>& vlist) const 
  |          { 
  |             std::size_t count = 0; 
  |  
  |             if (!map.empty()) 
  |             { 
  |                tm_const_itr_t itr = map.begin(); 
  |                tm_const_itr_t end = map.end  (); 
  |  
  |                while (end != itr) 
  |                { 
  |                   vlist.push_back((*itr).first); 
  |                   ++itr; 
  |                   ++count; 
  |                } 
  |             } 
  |  
  |             return count; 
  |          } 
  |       }; 
  |  
  |       typedef details::expression_node<T>*        expression_ptr; 
  |       typedef typename details::variable_node<T>  variable_t; 
  |       typedef typename details::vector_holder<T>  vector_holder_t; 
  |       typedef variable_t*                         variable_ptr; 
  |       #ifndef exprtk_disable_string_capabilities 
  |       typedef typename details::stringvar_node<T> stringvar_t; 
  |       typedef stringvar_t*                        stringvar_ptr; 
  |       #endif 
  |       typedef ifunction        <T>                function_t; 
  |       typedef ivararg_function <T>                vararg_function_t; 
  |       typedef igeneric_function<T>                generic_function_t; 
  |       typedef function_t*                         function_ptr; 
  |       typedef vararg_function_t*                  vararg_function_ptr; 
  |       typedef generic_function_t*                 generic_function_ptr; 
  |  
  |       static const std::size_t lut_size = 256; 
  |  
  |       // Symbol Table Holder 
  |       struct control_block 
  |       { 
  |          struct st_data 
  |          { 
  |             type_store<variable_t        , T                 > variable_store; 
  |             type_store<function_t        , function_t        > function_store; 
  |             type_store<vararg_function_t , vararg_function_t > vararg_function_store; 
  |             type_store<generic_function_t, generic_function_t> generic_function_store; 
  |             type_store<generic_function_t, generic_function_t> string_function_store; 
  |             type_store<generic_function_t, generic_function_t> overload_function_store; 
  |             type_store<vector_holder_t   , vector_holder_t   > vector_store; 
  |             #ifndef exprtk_disable_string_capabilities 
  |             type_store<stringvar_t       , std::string       > stringvar_store; 
  |             #endif 
  |  
  |             st_data() 
  |             { 
  |                for (std::size_t i = 0; i < details::reserved_words_size; ++i) 
  |                { 
  |                   reserved_symbol_table_.insert(details::reserved_words[i]); 
  |                } 
  |  
  |                for (std::size_t i = 0; i < details::reserved_symbols_size; ++i) 
  |                { 
  |                   reserved_symbol_table_.insert(details::reserved_symbols[i]); 
  |                } 
  |             } 
  |  
  |            ~st_data() 
  |             { 
  |                for (std::size_t i = 0; i < free_function_list_.size(); ++i) 
  |                { 
  |                   delete free_function_list_[i]; 
  |                } 
  |             } 
  |  
  |             inline bool is_reserved_symbol(const std::string& symbol) const 
  |             { 
  |                return (reserved_symbol_table_.end() != reserved_symbol_table_.find(symbol)); 
  |             } 
  |  
  |             static inline st_data* create() 
  |             { 
  |                return (new st_data); 
  |             } 
  |  
  |             static inline void destroy(st_data*& sd) 
  |             { 
  |                delete sd; 
  |                sd = reinterpret_cast<st_data*>(0); 
  |             } 
  |  
  |             std::list<T>               local_symbol_list_; 
  |             std::list<std::string>     local_stringvar_list_; 
  |             std::set<std::string>      reserved_symbol_table_; 
  |             std::vector<ifunction<T>*> free_function_list_; 
  |          }; 
  |  
  |          control_block() 
  |          : ref_count(1) 
  |          , data_(st_data::create()) 
  |          , mutability_(e_mutable) 
  |          {} 
  |  
  |          explicit control_block(st_data* data) 
  |          : ref_count(1) 
  |          , data_(data) 
  |          , mutability_(e_mutable) 
  |          {} 
  |  
  |         ~control_block() 
  |          { 
  |             if (data_ && (0 == ref_count)) 
  |             { 
  |                st_data::destroy(data_); 
  |             } 
  |          } 
  |  
  |          static inline control_block* create() 
  |          { 
  |             return (new control_block); 
  |          } 
  |  
  |          template <typename SymTab> 
  |          static inline void destroy(control_block*& cntrl_blck, SymTab* sym_tab) 
  |          { 
  |             if (cntrl_blck) 
  |             { 
  |                if ( 
  |                     (0 !=   cntrl_blck->ref_count) && 
  |                     (0 == --cntrl_blck->ref_count) 
  |                   ) 
  |                { 
  |                   if (sym_tab) 
  |                      sym_tab->clear(); 
  |  
  |                   delete cntrl_blck; 
  |                } 
  |  
  |                cntrl_blck = 0; 
  |             } 
  |          } 
  |  
  |          void set_mutability(const symtab_mutability_type mutability) 
  |          { 
  |             mutability_ = mutability; 
  |          } 
  |  
  |          std::size_t ref_count; 
  |          st_data* data_; 
  |          symtab_mutability_type mutability_; 
  |       }; 
  |  
  |    public: 
  |  
  |       explicit symbol_table(const symtab_mutability_type mutability = e_mutable) 
  |       : control_block_(control_block::create()) 
  |       { 
  |          control_block_->set_mutability(mutability); 
  |          clear(); 
  |       } 
  |  
  |      ~symbol_table() 
  |       { 
  |          exprtk::details::dump_ptr("~symbol_table", this); 
  |          control_block::destroy(control_block_, this); 
  |       } 
  |  
  |       symbol_table(const symbol_table<T>& st) 
  |       { 
  |          control_block_ = st.control_block_; 
  |          control_block_->ref_count++; 
  |       } 
  |  
  |       inline symbol_table<T>& operator=(const symbol_table<T>& st) 
  |       { 
  |          if (this != &st) 
  |          { 
  |             control_block::destroy(control_block_,reinterpret_cast<symbol_table<T>*>(0)); 
  |  
  |             control_block_ = st.control_block_; 
  |             control_block_->ref_count++; 
  |          } 
  |  
  |          return (*this); 
  |       } 
  |  
  |       inline bool operator==(const symbol_table<T>& st) const 
  |       { 
  |          return (this == &st) || (control_block_ == st.control_block_); 
  |       } 
  |  
  |       inline symtab_mutability_type mutability() const 
  |       { 
  |          return valid() ? control_block_->mutability_ : e_unknown; 
  |       } 
  |  
  |       inline void clear_variables(const bool delete_node = true) 
  |       { 
  |          local_data().variable_store.clear(delete_node); 
  |       } 
  |  
  |       inline void clear_functions() 
  |       { 
  |          local_data().function_store.clear(); 
  |       } 
  |  
  |       inline void clear_strings() 
  |       { 
  |          #ifndef exprtk_disable_string_capabilities 
  |          local_data().stringvar_store.clear(); 
  |          #endif 
  |       } 
  |  
  |       inline void clear_vectors() 
  |       { 
  |          local_data().vector_store.clear(); 
  |       } 
  |  
  |       inline void clear_local_constants() 
  |       { 
  |          local_data().local_symbol_list_.clear(); 
  |       } 
  |  
  |       inline void clear() 
  |       { 
  |          if (!valid()) return; 
  |          clear_variables      (); 
  |          clear_functions      (); 
  |          clear_strings        (); 
  |          clear_vectors        (); 
  |          clear_local_constants(); 
  |       } 
  |  
  |       inline std::size_t variable_count() const 
  |       { 
  |          if (valid()) 
  |             return local_data().variable_store.size; 
  |          else 
  |             return 0; 
  |       } 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       inline std::size_t stringvar_count() const 
  |       { 
  |          if (valid()) 
  |             return local_data().stringvar_store.size; 
  |          else 
  |             return 0; 
  |       } 
  |       #endif 
  |  
  |       inline std::size_t function_count() const 
  |       { 
  |          if (valid()) 
  |             return local_data().function_store.size; 
  |          else 
  |             return 0; 
  |       } 
  |  
  |       inline std::size_t vector_count() const 
  |       { 
  |          if (valid()) 
  |             return local_data().vector_store.size; 
  |          else 
  |             return 0; 
  |       } 
  |  
  |       inline variable_ptr get_variable(const std::string& variable_name) const 
  |       { 
  |          if (!valid()) 
  |             return reinterpret_cast<variable_ptr>(0); 
  |          else if (!valid_symbol(variable_name)) 
  |             return reinterpret_cast<variable_ptr>(0); 
  |          else 
  |             return local_data().variable_store.get(variable_name); 
  |       } 
  |  
  |       inline variable_ptr get_variable(const T& var_ref) const 
  |       { 
  |          if (!valid()) 
  |             return reinterpret_cast<variable_ptr>(0); 
  |          else 
  |             return local_data().variable_store.get_from_varptr( 
  |                                                   reinterpret_cast<const void*>(&var_ref)); 
  |       } 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       inline stringvar_ptr get_stringvar(const std::string& string_name) const 
  |       { 
  |          if (!valid()) 
  |             return reinterpret_cast<stringvar_ptr>(0); 
  |          else if (!valid_symbol(string_name)) 
  |             return reinterpret_cast<stringvar_ptr>(0); 
  |          else 
  |             return local_data().stringvar_store.get(string_name); 
  |       } 
  |  
  |       inline stringvar_base<T> get_stringvar_base(const std::string& string_name) const 
  |       { 
  |          static stringvar_base<T> null_stringvar_base("",reinterpret_cast<stringvar_ptr>(0)); 
  |          if (!valid()) 
  |             return null_stringvar_base; 
  |          else if (!valid_symbol(string_name)) 
  |             return null_stringvar_base; 
  |  
  |          stringvar_ptr stringvar = local_data().stringvar_store.get(string_name); 
  |  
  |          if (0 == stringvar) 
  |          { 
  |             return null_stringvar_base; 
  |          } 
  |  
  |          return stringvar_base<T>(string_name,stringvar); 
  |       } 
  |       #endif 
  |  
  |       inline function_ptr get_function(const std::string& function_name) const 
  |       { 
  |          if (!valid()) 
  |             return reinterpret_cast<function_ptr>(0); 
  |          else if (!valid_symbol(function_name)) 
  |             return reinterpret_cast<function_ptr>(0); 
  |          else 
  |             return local_data().function_store.get(function_name); 
  |       } 
  |  
  |       inline vararg_function_ptr get_vararg_function(const std::string& vararg_function_name) const 
  |       { 
  |          if (!valid()) 
  |             return reinterpret_cast<vararg_function_ptr>(0); 
  |          else if (!valid_symbol(vararg_function_name)) 
  |             return reinterpret_cast<vararg_function_ptr>(0); 
  |          else 
  |             return local_data().vararg_function_store.get(vararg_function_name); 
  |       } 
  |  
  |       inline generic_function_ptr get_generic_function(const std::string& function_name) const 
  |       { 
  |          if (!valid()) 
  |             return reinterpret_cast<generic_function_ptr>(0); 
  |          else if (!valid_symbol(function_name)) 
  |             return reinterpret_cast<generic_function_ptr>(0); 
  |          else 
  |             return local_data().generic_function_store.get(function_name); 
  |       } 
  |  
  |       inline generic_function_ptr get_string_function(const std::string& function_name) const 
  |       { 
  |          if (!valid()) 
  |             return reinterpret_cast<generic_function_ptr>(0); 
  |          else if (!valid_symbol(function_name)) 
  |             return reinterpret_cast<generic_function_ptr>(0); 
  |          else 
  |             return local_data().string_function_store.get(function_name); 
  |       } 
  |  
  |       inline generic_function_ptr get_overload_function(const std::string& function_name) const 
  |       { 
  |          if (!valid()) 
  |             return reinterpret_cast<generic_function_ptr>(0); 
  |          else if (!valid_symbol(function_name)) 
  |             return reinterpret_cast<generic_function_ptr>(0); 
  |          else 
  |             return local_data().overload_function_store.get(function_name); 
  |       } 
  |  
  |       typedef vector_holder_t* vector_holder_ptr; 
  |  
  |       inline vector_holder_ptr get_vector(const std::string& vector_name) const 
  |       { 
  |          if (!valid()) 
  |             return reinterpret_cast<vector_holder_ptr>(0); 
  |          else if (!valid_symbol(vector_name)) 
  |             return reinterpret_cast<vector_holder_ptr>(0); 
  |          else 
  |             return local_data().vector_store.get(vector_name); 
  |       } 
  |  
  |       inline T& variable_ref(const std::string& symbol_name) 
  |       { 
  |          static T null_var = T(0); 
  |          if (!valid()) 
  |             return null_var; 
  |          else if (!valid_symbol(symbol_name)) 
  |             return null_var; 
  |          else 
  |             return local_data().variable_store.type_ref(symbol_name); 
  |       } 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       inline std::string& stringvar_ref(const std::string& symbol_name) 
  |       { 
  |          static std::string null_stringvar; 
  |          if (!valid()) 
  |             return null_stringvar; 
  |          else if (!valid_symbol(symbol_name)) 
  |             return null_stringvar; 
  |          else 
  |             return local_data().stringvar_store.type_ref(symbol_name); 
  |       } 
  |       #endif 
  |  
  |       inline bool is_constant_node(const std::string& symbol_name) const 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(symbol_name)) 
  |             return false; 
  |          else 
  |             return local_data().variable_store.is_constant(symbol_name); 
  |       } 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       inline bool is_constant_string(const std::string& symbol_name) const 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(symbol_name)) 
  |             return false; 
  |          else if (!local_data().stringvar_store.symbol_exists(symbol_name)) 
  |             return false; 
  |          else 
  |             return local_data().stringvar_store.is_constant(symbol_name); 
  |       } 
  |       #endif 
  |  
  |       inline bool create_variable(const std::string& variable_name, const T& value = T(0)) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(variable_name)) 
  |             return false; 
  |          else if (symbol_exists(variable_name)) 
  |             return false; 
  |  
  |          local_data().local_symbol_list_.push_back(value); 
  |          T& t = local_data().local_symbol_list_.back(); 
  |  
  |          return add_variable(variable_name,t); 
  |       } 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       inline bool create_stringvar(const std::string& stringvar_name, const std::string& value = std::string("")) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(stringvar_name)) 
  |             return false; 
  |          else if (symbol_exists(stringvar_name)) 
  |             return false; 
  |  
  |          local_data().local_stringvar_list_.push_back(value); 
  |          std::string& s = local_data().local_stringvar_list_.back(); 
  |  
  |          return add_stringvar(stringvar_name,s); 
  |       } 
  |       #endif 
  |  
  |       inline bool add_variable(const std::string& variable_name, T& t, const bool is_constant = false) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(variable_name)) 
  |             return false; 
  |          else if (symbol_exists(variable_name)) 
  |             return false; 
  |          else 
  |             return local_data().variable_store.add(variable_name, t, is_constant); 
  |       } 
  |  
  |       inline bool add_constant(const std::string& constant_name, const T& value) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(constant_name)) 
  |             return false; 
  |          else if (symbol_exists(constant_name)) 
  |             return false; 
  |  
  |          local_data().local_symbol_list_.push_back(value); 
  |          T& t = local_data().local_symbol_list_.back(); 
  |  
  |          return add_variable(constant_name, t, true); 
  |       } 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       inline bool add_stringvar(const std::string& stringvar_name, std::string& s, const bool is_constant = false) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(stringvar_name)) 
  |             return false; 
  |          else if (symbol_exists(stringvar_name)) 
  |             return false; 
  |          else 
  |             return local_data().stringvar_store.add(stringvar_name, s, is_constant); 
  |       } 
  |       #endif 
  |  
  |       inline bool add_function(const std::string& function_name, function_t& function) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(function_name)) 
  |             return false; 
  |          else if (symbol_exists(function_name)) 
  |             return false; 
  |          else 
  |             return local_data().function_store.add(function_name,function); 
  |       } 
  |  
  |       inline bool add_function(const std::string& vararg_function_name, vararg_function_t& vararg_function) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(vararg_function_name)) 
  |             return false; 
  |          else if (symbol_exists(vararg_function_name)) 
  |             return false; 
  |          else 
  |             return local_data().vararg_function_store.add(vararg_function_name,vararg_function); 
  |       } 
  |  
  |       inline bool add_function(const std::string& function_name, generic_function_t& function) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(function_name)) 
  |             return false; 
  |          else if (symbol_exists(function_name)) 
  |             return false; 
  |          else 
  |          { 
  |             switch (function.rtrn_type) 
  |             { 
  |                case generic_function_t::e_rtrn_scalar : 
  |                   return (std::string::npos == function.parameter_sequence.find_first_not_of("STVZ*?|")) ? 
  |                          local_data().generic_function_store.add(function_name,function) : false; 
  |  
  |                case generic_function_t::e_rtrn_string : 
  |                   return (std::string::npos == function.parameter_sequence.find_first_not_of("STVZ*?|")) ? 
  |                          local_data().string_function_store.add(function_name,function)  : false; 
  |  
  |                case generic_function_t::e_rtrn_overload : 
  |                   return (std::string::npos == function.parameter_sequence.find_first_not_of("STVZ*?|:")) ? 
  |                          local_data().overload_function_store.add(function_name,function) : false; 
  |             } 
  |          } 
  |  
  |          return false; 
  |       } 
  |  
  |       #define exprtk_define_freefunction(NN)                                                \ 
  |       inline bool add_function(const std::string& function_name, ff##NN##_functor function) \ 
  |       {                                                                                     \ 
  |          if (!valid())                                                                      \ 
  |          { return false; }                                                                  \ 
  |          if (!valid_symbol(function_name))                                                  \ 
  |          { return false; }                                                                  \ 
  |          if (symbol_exists(function_name))                                                  \ 
  |          { return false; }                                                                  \ 
  |                                                                                             \ 
  |          exprtk::ifunction<T>* ifunc = new freefunc##NN(function);                          \ 
  |                                                                                             \ 
  |          local_data().free_function_list_.push_back(ifunc);                                 \ 
  |                                                                                             \ 
  |          return add_function(function_name,(*local_data().free_function_list_.back()));     \ 
  |       }                                                                                     \ 
  |  
  |       exprtk_define_freefunction(00) exprtk_define_freefunction(01) 
  |       exprtk_define_freefunction(02) exprtk_define_freefunction(03) 
  |       exprtk_define_freefunction(04) exprtk_define_freefunction(05) 
  |       exprtk_define_freefunction(06) exprtk_define_freefunction(07) 
  |       exprtk_define_freefunction(08) exprtk_define_freefunction(09) 
  |       exprtk_define_freefunction(10) exprtk_define_freefunction(11) 
  |       exprtk_define_freefunction(12) exprtk_define_freefunction(13) 
  |       exprtk_define_freefunction(14) exprtk_define_freefunction(15) 
  |  
  |       #undef exprtk_define_freefunction 
  |  
  |       inline bool add_reserved_function(const std::string& function_name, function_t& function) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(function_name,false)) 
  |             return false; 
  |          else if (symbol_exists(function_name,false)) 
  |             return false; 
  |          else 
  |             return local_data().function_store.add(function_name,function); 
  |       } 
  |  
  |       inline bool add_reserved_function(const std::string& vararg_function_name, vararg_function_t& vararg_function) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(vararg_function_name,false)) 
  |             return false; 
  |          else if (symbol_exists(vararg_function_name,false)) 
  |             return false; 
  |          else 
  |             return local_data().vararg_function_store.add(vararg_function_name,vararg_function); 
  |       } 
  |  
  |       inline bool add_reserved_function(const std::string& function_name, generic_function_t& function) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(function_name,false)) 
  |             return false; 
  |          else if (symbol_exists(function_name,false)) 
  |             return false; 
  |          else 
  |          { 
  |             switch (function.rtrn_type) 
  |             { 
  |                case generic_function_t::e_rtrn_scalar : 
  |                   return (std::string::npos == function.parameter_sequence.find_first_not_of("STVZ*?|")) ? 
  |                          local_data().generic_function_store.add(function_name,function) : false; 
  |  
  |                case generic_function_t::e_rtrn_string : 
  |                   return (std::string::npos == function.parameter_sequence.find_first_not_of("STVZ*?|")) ? 
  |                          local_data().string_function_store.add(function_name,function)  : false; 
  |  
  |                case generic_function_t::e_rtrn_overload : 
  |                   return (std::string::npos == function.parameter_sequence.find_first_not_of("STVZ*?|:")) ? 
  |                          local_data().overload_function_store.add(function_name,function) : false; 
  |             } 
  |          } 
  |  
  |          return false; 
  |       } 
  |  
  |       #define exprtk_define_reserved_function(NN)                                                    \ 
  |       inline bool add_reserved_function(const std::string& function_name, ff##NN##_functor function) \ 
  |       {                                                                                              \ 
  |          if (!valid())                                                                               \ 
  |          { return false; }                                                                           \ 
  |          if (!valid_symbol(function_name,false))                                                     \ 
  |          { return false; }                                                                           \ 
  |          if (symbol_exists(function_name,false))                                                     \ 
  |          { return false; }                                                                           \ 
  |                                                                                                      \ 
  |          exprtk::ifunction<T>* ifunc = new freefunc##NN(function);                                   \ 
  |                                                                                                      \ 
  |          local_data().free_function_list_.push_back(ifunc);                                          \ 
  |                                                                                                      \ 
  |          return add_reserved_function(function_name,(*local_data().free_function_list_.back()));     \ 
  |       }                                                                                              \ 
  |  
  |       exprtk_define_reserved_function(00) exprtk_define_reserved_function(01) 
  |       exprtk_define_reserved_function(02) exprtk_define_reserved_function(03) 
  |       exprtk_define_reserved_function(04) exprtk_define_reserved_function(05) 
  |       exprtk_define_reserved_function(06) exprtk_define_reserved_function(07) 
  |       exprtk_define_reserved_function(08) exprtk_define_reserved_function(09) 
  |       exprtk_define_reserved_function(10) exprtk_define_reserved_function(11) 
  |       exprtk_define_reserved_function(12) exprtk_define_reserved_function(13) 
  |       exprtk_define_reserved_function(14) exprtk_define_reserved_function(15) 
  |  
  |       #undef exprtk_define_reserved_function 
  |  
  |       template <std::size_t N> 
  |       inline bool add_vector(const std::string& vector_name, T (&v)[N]) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(vector_name)) 
  |             return false; 
  |          else if (symbol_exists(vector_name)) 
  |             return false; 
  |          else 
  |             return local_data().vector_store.add(vector_name,v); 
  |       } 
  |  
  |       inline bool add_vector(const std::string& vector_name, T* v, const std::size_t& v_size) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(vector_name)) 
  |             return false; 
  |          else if (symbol_exists(vector_name)) 
  |             return false; 
  |          else if (0 == v_size) 
  |             return false; 
  |          else 
  |             return local_data().vector_store.add(vector_name, v, v_size); 
  |       } 
  |  
  |       template <typename Allocator> 
  |       inline bool add_vector(const std::string& vector_name, std::vector<T,Allocator>& v) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(vector_name)) 
  |             return false; 
  |          else if (symbol_exists(vector_name)) 
  |             return false; 
  |          else if (0 == v.size()) 
  |             return false; 
  |          else 
  |             return local_data().vector_store.add(vector_name,v); 
  |       } 
  |  
  |       inline bool add_vector(const std::string& vector_name, exprtk::vector_view<T>& v) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(vector_name)) 
  |             return false; 
  |          else if (symbol_exists(vector_name)) 
  |             return false; 
  |          else if (0 == v.size()) 
  |             return false; 
  |          else 
  |             return local_data().vector_store.add(vector_name,v); 
  |       } 
  |  
  |       inline bool remove_variable(const std::string& variable_name, const bool delete_node = true) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else 
  |             return local_data().variable_store.remove(variable_name, delete_node); 
  |       } 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       inline bool remove_stringvar(const std::string& string_name) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else 
  |             return local_data().stringvar_store.remove(string_name); 
  |       } 
  |       #endif 
  |  
  |       inline bool remove_function(const std::string& function_name) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else 
  |             return local_data().function_store.remove(function_name); 
  |       } 
  |  
  |       inline bool remove_vararg_function(const std::string& vararg_function_name) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else 
  |             return local_data().vararg_function_store.remove(vararg_function_name); 
  |       } 
  |  
  |       inline bool remove_vector(const std::string& vector_name) 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else 
  |             return local_data().vector_store.remove(vector_name); 
  |       } 
  |  
  |       inline bool add_constants() 
  |       { 
  |          return add_pi      () && 
  |                 add_epsilon () && 
  |                 add_infinity() ; 
  |       } 
  |  
  |       inline bool add_pi() 
  |       { 
  |          const typename details::numeric::details::number_type<T>::type num_type; 
  |          static const T local_pi = details::numeric::details::const_pi_impl<T>(num_type); 
  |          return add_constant("pi",local_pi); 
  |       } 
  |  
  |       inline bool add_epsilon() 
  |       { 
  |          static const T local_epsilon = details::numeric::details::epsilon_type<T>::value(); 
  |          return add_constant("epsilon",local_epsilon); 
  |       } 
  |  
  |       inline bool add_infinity() 
  |       { 
  |          static const T local_infinity = std::numeric_limits<T>::infinity(); 
  |          return add_constant("inf",local_infinity); 
  |       } 
  |  
  |       template <typename Package> 
  |       inline bool add_package(Package& package) 
  |       { 
  |          return package.register_package(*this); 
  |       } 
  |  
  |       template <typename Allocator, 
  |                 template <typename, typename> class Sequence> 
  |       inline std::size_t get_variable_list(Sequence<std::pair<std::string,T>,Allocator>& vlist) const 
  |       { 
  |          if (!valid()) 
  |             return 0; 
  |          else 
  |             return local_data().variable_store.get_list(vlist); 
  |       } 
  |  
  |       template <typename Allocator, 
  |                 template <typename, typename> class Sequence> 
  |       inline std::size_t get_variable_list(Sequence<std::string,Allocator>& vlist) const 
  |       { 
  |          if (!valid()) 
  |             return 0; 
  |          else 
  |             return local_data().variable_store.get_list(vlist); 
  |       } 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       template <typename Allocator, 
  |                 template <typename, typename> class Sequence> 
  |       inline std::size_t get_stringvar_list(Sequence<std::pair<std::string,std::string>,Allocator>& svlist) const 
  |       { 
  |          if (!valid()) 
  |             return 0; 
  |          else 
  |             return local_data().stringvar_store.get_list(svlist); 
  |       } 
  |  
  |       template <typename Allocator, 
  |                 template <typename, typename> class Sequence> 
  |       inline std::size_t get_stringvar_list(Sequence<std::string,Allocator>& svlist) const 
  |       { 
  |          if (!valid()) 
  |             return 0; 
  |          else 
  |             return local_data().stringvar_store.get_list(svlist); 
  |       } 
  |       #endif 
  |  
  |       template <typename Allocator, 
  |                 template <typename, typename> class Sequence> 
  |       inline std::size_t get_vector_list(Sequence<std::string,Allocator>& vec_list) const 
  |       { 
  |          if (!valid()) 
  |             return 0; 
  |          else 
  |             return local_data().vector_store.get_list(vec_list); 
  |       } 
  |  
  |       template <typename Allocator, 
  |                 template <typename, typename> class Sequence> 
  |       inline std::size_t get_function_list(Sequence<std::string,Allocator>& function_list) const 
  |       { 
  |          if (!valid()) 
  |             return 0; 
  |  
  |          std::vector<std::string> function_names; 
  |          std::size_t count = 0; 
  |  
  |          count += local_data().function_store         .get_list(function_names); 
  |          count += local_data().vararg_function_store  .get_list(function_names); 
  |          count += local_data().generic_function_store .get_list(function_names); 
  |          count += local_data().string_function_store  .get_list(function_names); 
  |          count += local_data().overload_function_store.get_list(function_names); 
  |  
  |          std::set<std::string> function_set; 
  |  
  |          for (std::size_t i = 0; i < function_names.size(); ++i) 
  |          { 
  |             function_set.insert(function_names[i]); 
  |          } 
  |  
  |          std::copy(function_set.begin(), function_set.end(), 
  |                    std::back_inserter(function_list)); 
  |  
  |          return count; 
  |       } 
  |  
  |       inline std::vector<std::string> get_function_list() const 
  |       { 
  |          std::vector<std::string> result; 
  |          get_function_list(result); 
  |          return result; 
  |       } 
  |  
  |       inline bool symbol_exists(const std::string& symbol_name, const bool check_reserved_symb = true) const 
  |       { 
  |          /* 
  |             Function will return true if symbol_name exists as either a 
  |             reserved symbol, variable, stringvar, vector or function name 
  |             in any of the type stores. 
  |          */ 
  |          if (!valid()) 
  |             return false; 
  |          else if (local_data().variable_store.symbol_exists(symbol_name)) 
  |             return true; 
  |          #ifndef exprtk_disable_string_capabilities 
  |          else if (local_data().stringvar_store.symbol_exists(symbol_name)) 
  |             return true; 
  |          #endif 
  |          else if (local_data().vector_store.symbol_exists(symbol_name)) 
  |             return true; 
  |          else if (local_data().function_store.symbol_exists(symbol_name)) 
  |             return true; 
  |          else if (check_reserved_symb && local_data().is_reserved_symbol(symbol_name)) 
  |             return true; 
  |          else 
  |             return false; 
  |       } 
  |  
  |       inline bool is_variable(const std::string& variable_name) const 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else 
  |             return local_data().variable_store.symbol_exists(variable_name); 
  |       } 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       inline bool is_stringvar(const std::string& stringvar_name) const 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else 
  |             return local_data().stringvar_store.symbol_exists(stringvar_name); 
  |       } 
  |  
  |       inline bool is_conststr_stringvar(const std::string& symbol_name) const 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else if (!valid_symbol(symbol_name)) 
  |             return false; 
  |          else if (!local_data().stringvar_store.symbol_exists(symbol_name)) 
  |             return false; 
  |  
  |          return ( 
  |                   local_data().stringvar_store.symbol_exists(symbol_name) || 
  |                   local_data().stringvar_store.is_constant  (symbol_name) 
  |                 ); 
  |       } 
  |       #endif 
  |  
  |       inline bool is_function(const std::string& function_name) const 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else 
  |             return local_data().function_store.symbol_exists(function_name); 
  |       } 
  |  
  |       inline bool is_vararg_function(const std::string& vararg_function_name) const 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else 
  |             return local_data().vararg_function_store.symbol_exists(vararg_function_name); 
  |       } 
  |  
  |       inline bool is_vector(const std::string& vector_name) const 
  |       { 
  |          if (!valid()) 
  |             return false; 
  |          else 
  |             return local_data().vector_store.symbol_exists(vector_name); 
  |       } 
  |  
  |       inline std::string get_variable_name(const expression_ptr& ptr) const 
  |       { 
  |          return local_data().variable_store.entity_name(ptr); 
  |       } 
  |  
  |       inline std::string get_vector_name(const vector_holder_ptr& ptr) const 
  |       { 
  |          return local_data().vector_store.entity_name(ptr); 
  |       } 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       inline std::string get_stringvar_name(const expression_ptr& ptr) const 
  |       { 
  |          return local_data().stringvar_store.entity_name(ptr); 
  |       } 
  |  
  |       inline std::string get_conststr_stringvar_name(const expression_ptr& ptr) const 
  |       { 
  |          return local_data().stringvar_store.entity_name(ptr); 
  |       } 
  |       #endif 
  |  
  |       inline bool valid() const 
  |       { 
  |          // Symbol table sanity check. 
  |          return control_block_ && control_block_->data_; 
  |       } 
  |  
  |       inline void load_from(const symbol_table<T>& st) 
  |       { 
  |          { 
  |             std::vector<std::string> name_list; 
  |  
  |             st.local_data().function_store.get_list(name_list); 
  |  
  |             if (!name_list.empty()) 
  |             { 
  |                for (std::size_t i = 0; i < name_list.size(); ++i) 
  |                { 
  |                   exprtk::ifunction<T>& ifunc = *st.get_function(name_list[i]); 
  |                   add_function(name_list[i],ifunc); 
  |                } 
  |             } 
  |          } 
  |  
  |          { 
  |             std::vector<std::string> name_list; 
  |  
  |             st.local_data().vararg_function_store.get_list(name_list); 
  |  
  |             if (!name_list.empty()) 
  |             { 
  |                for (std::size_t i = 0; i < name_list.size(); ++i) 
  |                { 
  |                   exprtk::ivararg_function<T>& ivafunc = *st.get_vararg_function(name_list[i]); 
  |                   add_function(name_list[i],ivafunc); 
  |                } 
  |             } 
  |          } 
  |  
  |          { 
  |             std::vector<std::string> name_list; 
  |  
  |             st.local_data().generic_function_store.get_list(name_list); 
  |  
  |             if (!name_list.empty()) 
  |             { 
  |                for (std::size_t i = 0; i < name_list.size(); ++i) 
  |                { 
  |                   exprtk::igeneric_function<T>& ifunc = *st.get_generic_function(name_list[i]); 
  |                   add_function(name_list[i],ifunc); 
  |                } 
  |             } 
  |          } 
  |  
  |          { 
  |             std::vector<std::string> name_list; 
  |  
  |             st.local_data().string_function_store.get_list(name_list); 
  |  
  |             if (!name_list.empty()) 
  |             { 
  |                for (std::size_t i = 0; i < name_list.size(); ++i) 
  |                { 
  |                   exprtk::igeneric_function<T>& ifunc = *st.get_string_function(name_list[i]); 
  |                   add_function(name_list[i],ifunc); 
  |                } 
  |             } 
  |          } 
  |  
  |          { 
  |             std::vector<std::string> name_list; 
  |  
  |             st.local_data().overload_function_store.get_list(name_list); 
  |  
  |             if (!name_list.empty()) 
  |             { 
  |                for (std::size_t i = 0; i < name_list.size(); ++i) 
  |                { 
  |                   exprtk::igeneric_function<T>& ifunc = *st.get_overload_function(name_list[i]); 
  |                   add_function(name_list[i],ifunc); 
  |                } 
  |             } 
  |          } 
  |       } 
  |  
  |       inline void load_variables_from(const symbol_table<T>& st) 
  |       { 
  |          std::vector<std::string> name_list; 
  |  
  |          st.local_data().variable_store.get_list(name_list); 
  |  
  |          if (!name_list.empty()) 
  |          { 
  |             for (std::size_t i = 0; i < name_list.size(); ++i) 
  |             { 
  |                T& variable = st.get_variable(name_list[i])->ref(); 
  |                add_variable(name_list[i], variable); 
  |             } 
  |          } 
  |       } 
  |  
  |       inline void load_vectors_from(const symbol_table<T>& st) 
  |       { 
  |          std::vector<std::string> name_list; 
  |  
  |          st.local_data().vector_store.get_list(name_list); 
  |  
  |          if (!name_list.empty()) 
  |          { 
  |             for (std::size_t i = 0; i < name_list.size(); ++i) 
  |             { 
  |                vector_holder_t& vecholder = *st.get_vector(name_list[i]); 
  |                add_vector(name_list[i], vecholder.data(), vecholder.size()); 
  |             } 
  |          } 
  |       } 
  |  
  |    private: 
  |  
  |       inline bool valid_symbol(const std::string& symbol, const bool check_reserved_symb = true) const 
  |       { 
  |          if (symbol.empty()) 
  |             return false; 
  |          else if (!details::is_letter(symbol[0])) 
  |             return false; 
  |          else if (symbol.size() > 1) 
  |          { 
  |             for (std::size_t i = 1; i < symbol.size(); ++i) 
  |             { 
  |                if ( 
  |                     !details::is_letter_or_digit(symbol[i]) && 
  |                     ('_' != symbol[i]) 
  |                   ) 
  |                { 
  |                   if ((i < (symbol.size() - 1)) && ('.' == symbol[i])) 
  |                      continue; 
  |                   else 
  |                      return false; 
  |                } 
  |             } 
  |          } 
  |  
  |          return (check_reserved_symb) ? (!local_data().is_reserved_symbol(symbol)) : true; 
  |       } 
  |  
  |       inline bool valid_function(const std::string& symbol) const 
  |       { 
  |          if (symbol.empty()) 
  |             return false; 
  |          else if (!details::is_letter(symbol[0])) 
  |             return false; 
  |          else if (symbol.size() > 1) 
  |          { 
  |             for (std::size_t i = 1; i < symbol.size(); ++i) 
  |             { 
  |                if ( 
  |                     !details::is_letter_or_digit(symbol[i]) && 
  |                     ('_' != symbol[i]) 
  |                   ) 
  |                { 
  |                   if ((i < (symbol.size() - 1)) && ('.' == symbol[i])) 
  |                      continue; 
  |                   else 
  |                      return false; 
  |                } 
  |             } 
  |          } 
  |  
  |          return true; 
  |       } 
  |  
  |       typedef typename control_block::st_data local_data_t; 
  |  
  |       inline local_data_t& local_data() 
  |       { 
  |          return *(control_block_->data_); 
  |       } 
  |  
  |       inline const local_data_t& local_data() const 
  |       { 
  |          return *(control_block_->data_); 
  |       } 
  |  
  |       control_block* control_block_; 
  |  
  |       friend class parser<T>; 
  |    }; // class symbol_table 
  |  
  |    template <typename T> 
  |    class function_compositor; 
  |  
  |    template <typename T> 
  |    class expression 
  |    { 
  |    private: 
  |  
  |       typedef details::expression_node<T>*  expression_ptr; 
  |       typedef details::vector_holder<T>*    vector_holder_ptr; 
  |       typedef std::vector<symbol_table<T> > symtab_list_t; 
  |  
  |       struct control_block 
  |       { 
  |          enum data_type 
  |          { 
  |             e_unknown  , 
  |             e_expr     , 
  |             e_vecholder, 
  |             e_data     , 
  |             e_vecdata  , 
  |             e_string 
  |          }; 
  |  
  |          static std::string to_str(data_type dt) 
  |          { 
  |             switch(dt) 
  |             { 
  |                case e_unknown   : return "e_unknown  " 
  |                case e_expr      : return "e_expr"     ; 
  |                case e_vecholder : return "e_vecholder" 
  |                case e_data      : return "e_data"     ; 
  |                case e_vecdata   : return "e_vecdata"  ; 
  |                case e_string    : return "e_string"   ; 
  |             } 
  |  
  |             return "" 
  |          } 
  |  
  |          struct data_pack 
  |          { 
  |             data_pack() 
  |             : pointer(0) 
  |             , type(e_unknown) 
  |             , size(0) 
  |             {} 
  |  
  |             data_pack(void* ptr, const data_type dt, const std::size_t sz = 0) 
  |             : pointer(ptr) 
  |             , type(dt) 
  |             , size(sz) 
  |             {} 
  |  
  |             void*       pointer; 
  |             data_type   type; 
  |             std::size_t size; 
  |          }; 
  |  
  |          typedef std::vector<data_pack> local_data_list_t; 
  |          typedef results_context<T>     results_context_t; 
  |          typedef control_block*         cntrl_blck_ptr_t; 
  |  
  |          control_block() 
  |          : ref_count(0) 
  |          , expr     (0) 
  |          , results  (0) 
  |          , retinv_null(false) 
  |          , return_invoked(&retinv_null) 
  |          {} 
  |  
  |          explicit control_block(expression_ptr e) 
  |          : ref_count(1) 
  |          , expr     (e) 
  |          , results  (0) 
  |          , retinv_null(false) 
  |          , return_invoked(&retinv_null) 
  |          {} 
  |  
  |         ~control_block() 
  |          { 
  |             if (expr && details::branch_deletable(expr)) 
  |             { 
  |                destroy_node(expr); 
  |             } 
  |  
  |             if (!local_data_list.empty()) 
  |             { 
  |                for (std::size_t i = 0; i < local_data_list.size(); ++i) 
  |                { 
  |                   switch (local_data_list[i].type) 
  |                   { 
  |                      case e_expr      : delete reinterpret_cast<expression_ptr>(local_data_list[i].pointer); 
  |                                         break; 
  |  
  |                      case e_vecholder : delete reinterpret_cast<vector_holder_ptr>(local_data_list[i].pointer); 
  |                                         break; 
  |  
  |                      case e_data      : delete reinterpret_cast<T*>(local_data_list[i].pointer); 
  |                                         break; 
  |  
  |                      case e_vecdata   : delete [] reinterpret_cast<T*>(local_data_list[i].pointer); 
  |                                         break; 
  |  
  |                      case e_string    : delete reinterpret_cast<std::string*>(local_data_list[i].pointer); 
  |                                         break; 
  |  
  |                      default          : break; 
  |                   } 
  |                } 
  |             } 
  |  
  |             if (results) 
  |             { 
  |                delete results; 
  |             } 
  |          } 
  |  
  |          static inline cntrl_blck_ptr_t create(expression_ptr e) 
  |          { 
  |             return new control_block(e); 
  |          } 
  |  
  |          static inline void destroy(cntrl_blck_ptr_t& cntrl_blck) 
  |          { 
  |             if (cntrl_blck) 
  |             { 
  |                if ( 
  |                     (0 !=   cntrl_blck->ref_count) && 
  |                     (0 == --cntrl_blck->ref_count) 
  |                   ) 
  |                { 
  |                   delete cntrl_blck; 
  |                } 
  |  
  |                cntrl_blck = 0; 
  |             } 
  |          } 
  |  
  |          std::size_t ref_count; 
  |          expression_ptr expr; 
  |          local_data_list_t local_data_list; 
  |          results_context_t* results; 
  |          bool  retinv_null; 
  |          bool* return_invoked; 
  |  
  |          friend class function_compositor<T>; 
  |       }; 
  |  
  |    public: 
  |  
  |       expression() 
  |       : control_block_(0) 
  |       { 
  |          set_expression(new details::null_node<T>()); 
  |       } 
  |  
  |       expression(const expression<T>& e) 
  |       : control_block_    (e.control_block_    ) 
  |       , symbol_table_list_(e.symbol_table_list_) 
  |       { 
  |          control_block_->ref_count++; 
  |       } 
  |  
  |       explicit expression(const symbol_table<T>& symbol_table) 
  |       : control_block_(0) 
  |       { 
  |          set_expression(new details::null_node<T>()); 
  |          symbol_table_list_.push_back(symbol_table); 
  |       } 
  |  
  |       inline expression<T>& operator=(const expression<T>& e) 
  |       { 
  |          if (this != &e) 
  |          { 
  |             if (control_block_) 
  |             { 
  |                if ( 
  |                     (0 !=   control_block_->ref_count) && 
  |                     (0 == --control_block_->ref_count) 
  |                   ) 
  |                { 
  |                   delete control_block_; 
  |                } 
  |  
  |                control_block_ = 0; 
  |             } 
  |  
  |             control_block_ = e.control_block_; 
  |             control_block_->ref_count++; 
  |             symbol_table_list_ = e.symbol_table_list_; 
  |          } 
  |  
  |          return *this; 
  |       } 
  |  
  |       inline bool operator==(const expression<T>& e) const 
  |       { 
  |          return (this == &e); 
  |       } 
  |  
  |       inline bool operator!() const 
  |       { 
  |          return ( 
  |                   (0 == control_block_      ) || 
  |                   (0 == control_block_->expr) 
  |                 ); 
  |       } 
  |  
  |       inline expression<T>& release() 
  |       { 
  |          exprtk::details::dump_ptr("expression::release", this); 
  |          control_block::destroy(control_block_); 
  |  
  |          return (*this); 
  |       } 
  |  
  |      ~expression() 
  |       { 
  |          control_block::destroy(control_block_); 
  |       } 
  |  
  |       inline T value() const 
  |       { 
  |          assert(control_block_      ); 
  |          assert(control_block_->expr); 
  |  
  |          return control_block_->expr->value(); 
  |       } 
  |  
  |       inline T operator() () const 
  |       { 
  |          return value(); 
  |       } 
  |  
  |       inline operator T() const 
  |       { 
  |          return value(); 
  |       } 
  |  
  |       inline operator bool() const 
  |       { 
  |          return details::is_true(value()); 
  |       } 
  |  
  |       inline bool register_symbol_table(symbol_table<T>& st) 
  |       { 
  |          for (std::size_t i = 0; i < symbol_table_list_.size(); ++i) 
  |          { 
  |             if (st == symbol_table_list_[i]) 
  |             { 
  |                return false; 
  |             } 
  |          } 
  |  
  |          symbol_table_list_.push_back(st); 
  |          return true; 
  |       } 
  |  
  |       inline const symbol_table<T>& get_symbol_table(const std::size_t& index = 0) const 
  |       { 
  |          return symbol_table_list_[index]; 
  |       } 
  |  
  |       inline symbol_table<T>& get_symbol_table(const std::size_t& index = 0) 
  |       { 
  |          return symbol_table_list_[index]; 
  |       } 
  |  
  |       std::size_t num_symbol_tables() const 
  |       { 
  |          return symbol_table_list_.size(); 
  |       } 
  |  
  |       typedef results_context<T> results_context_t; 
  |  
  |       inline const results_context_t& results() const 
  |       { 
  |          if (control_block_->results) 
  |             return (*control_block_->results); 
  |          else 
  |          { 
  |             static const results_context_t null_results; 
  |             return null_results; 
  |          } 
  |       } 
  |  
  |       inline bool return_invoked() const 
  |       { 
  |          return (*control_block_->return_invoked); 
  |       } 
  |  
  |    private: 
  |  
  |       inline symtab_list_t get_symbol_table_list() const 
  |       { 
  |          return symbol_table_list_; 
  |       } 
  |  
  |       inline void set_expression(const expression_ptr expr) 
  |       { 
  |          if (expr) 
  |          { 
  |             if (control_block_) 
  |             { 
  |                if (0 == --control_block_->ref_count) 
  |                { 
  |                   delete control_block_; 
  |                } 
  |             } 
  |  
  |             control_block_ = control_block::create(expr); 
  |          } 
  |       } 
  |  
  |       inline void register_local_var(expression_ptr expr) 
  |       { 
  |          if (expr) 
  |          { 
  |             if (control_block_) 
  |             { 
  |                control_block_-> 
  |                   local_data_list.push_back( 
  |                      typename expression<T>::control_block:: 
  |                         data_pack(reinterpret_cast<void*>(expr), 
  |                                   control_block::e_expr)); 
  |             } 
  |          } 
  |       } 
  |  
  |       inline void register_local_var(vector_holder_ptr vec_holder) 
  |       { 
  |          if (vec_holder) 
  |          { 
  |             if (control_block_) 
  |             { 
  |                control_block_-> 
  |                   local_data_list.push_back( 
  |                      typename expression<T>::control_block:: 
  |                         data_pack(reinterpret_cast<void*>(vec_holder), 
  |                                   control_block::e_vecholder)); 
  |             } 
  |          } 
  |       } 
  |  
  |       inline void register_local_data(void* data, const std::size_t& size = 0, const std::size_t data_mode = 0) 
  |       { 
  |          if (data) 
  |          { 
  |             if (control_block_) 
  |             { 
  |                typename control_block::data_type dt = control_block::e_data; 
  |  
  |                switch (data_mode) 
  |                { 
  |                   case 0 : dt = control_block::e_data;    break; 
  |                   case 1 : dt = control_block::e_vecdata; break; 
  |                   case 2 : dt = control_block::e_string;  break; 
  |                } 
  |  
  |                control_block_-> 
  |                   local_data_list.push_back( 
  |                      typename expression<T>::control_block:: 
  |                         data_pack(reinterpret_cast<void*>(data), dt, size)); 
  |             } 
  |          } 
  |       } 
  |  
  |       inline const typename control_block::local_data_list_t& local_data_list() 
  |       { 
  |          if (control_block_) 
  |          { 
  |             return control_block_->local_data_list; 
  |          } 
  |          else 
  |          { 
  |             static typename control_block::local_data_list_t null_local_data_list; 
  |             return null_local_data_list; 
  |          } 
  |       } 
  |  
  |       inline void register_return_results(results_context_t* rc) 
  |       { 
  |          if (control_block_ && rc) 
  |          { 
  |             control_block_->results = rc; 
  |          } 
  |       } 
  |  
  |       inline void set_retinvk(bool* retinvk_ptr) 
  |       { 
  |          if (control_block_) 
  |          { 
  |             control_block_->return_invoked = retinvk_ptr; 
  |          } 
  |       } 
  |  
  |       control_block* control_block_; 
  |       symtab_list_t  symbol_table_list_; 
  |  
  |       friend class parser<T>; 
  |       friend class expression_helper<T>; 
  |       friend class function_compositor<T>; 
  |       template <typename TT> 
  |       friend bool is_valid(const expression<TT>& expr); 
  |    }; // class expression 
  |  
  |    template <typename T> 
  |    class expression_helper 
  |    { 
  |    public: 
  |  
  |       enum node_types 
  |       { 
  |          e_literal, 
  |          e_variable, 
  |          e_string, 
  |          e_unary, 
  |          e_binary, 
  |          e_function, 
  |          e_vararg, 
  |          e_null, 
  |          e_assert, 
  |          e_sf3ext, 
  |          e_sf4ext 
  |       }; 
  |  
  |       static inline bool is_literal(const expression<T>& expr) 
  |       { 
  |          return expr.control_block_ && details::is_literal_node(expr.control_block_->expr); 
  |       } 
  |  
  |       static inline bool is_variable(const expression<T>& expr) 
  |       { 
  |          return expr.control_block_ && details::is_variable_node(expr.control_block_->expr); 
  |       } 
  |  
  |       static inline bool is_string(const expression<T>& expr) 
  |       { 
  |          return expr.control_block_ && details::is_generally_string_node(expr.control_block_->expr); 
  |       } 
  |  
  |       static inline bool is_unary(const expression<T>& expr) 
  |       { 
  |          return expr.control_block_ && details::is_unary_node(expr.control_block_->expr); 
  |       } 
  |  
  |       static inline bool is_binary(const expression<T>& expr) 
  |       { 
  |          return expr.control_block_ && details::is_binary_node(expr.control_block_->expr); 
  |       } 
  |  
  |       static inline bool is_function(const expression<T>& expr) 
  |       { 
  |          return expr.control_block_ && details::is_function(expr.control_block_->expr); 
  |       } 
  |  
  |       static inline bool is_vararg(const expression<T>& expr) 
  |       { 
  |          return expr.control_block_ && details::is_vararg_node(expr.control_block_->expr); 
  |       } 
  |  
  |       static inline bool is_null(const expression<T>& expr) 
  |       { 
  |          return expr.control_block_ && details::is_null_node(expr.control_block_->expr); 
  |       } 
  |  
  |       static inline bool is_assert(const expression<T>& expr) 
  |       { 
  |          return expr.control_block_ && details::is_assert_node(expr.control_block_->expr); 
  |       } 
  |  
  |       static inline bool is_sf3ext(const expression<T>& expr) 
  |       { 
  |          return expr.control_block_ && details::is_sf3ext_node(expr.control_block_->expr); 
  |       } 
  |  
  |       static inline bool is_sf4ext(const expression<T>& expr) 
  |       { 
  |          return expr.control_block_ && details::is_sf4ext_node(expr.control_block_->expr); 
  |       } 
  |  
  |       static inline bool is_type(const expression<T>& expr, const node_types node_type) 
  |       { 
  |          if (0 == expr.control_block_) 
  |          { 
  |             return false; 
  |          } 
  |  
  |          switch (node_type) 
  |          { 
  |             case e_literal  : return is_literal_node(expr); 
  |             case e_variable : return is_variable    (expr); 
  |             case e_string   : return is_string      (expr); 
  |             case e_unary    : return is_unary       (expr); 
  |             case e_binary   : return is_binary      (expr); 
  |             case e_function : return is_function    (expr); 
  |             case e_null     : return is_null        (expr); 
  |             case e_assert   : return is_assert      (expr); 
  |             case e_sf3ext   : return is_sf3ext      (expr); 
  |             case e_sf4ext   : return is_sf4ext      (expr); 
  |          }; 
  |  
  |          return false; 
  |       } 
  |  
  |       static inline bool match_type_sequence(const expression<T>& expr, const std::vector<node_types>& type_seq) 
  |       { 
  |          if ((0 == expr.control_block_) || !is_vararg(expr)) 
  |          { 
  |             return false; 
  |          } 
  |  
  |          typedef details::vararg_node<T, exprtk::details::vararg_multi_op<T> > mo_vararg_t; 
  |  
  |          mo_vararg_t* vnode = dynamic_cast<mo_vararg_t*>(expr.control_block_->expr); 
  |  
  |          if ( 
  |               (0 == vnode) || 
  |               type_seq.empty() || 
  |               (vnode->size() < type_seq.size()) 
  |             ) 
  |          { 
  |             return false; 
  |          } 
  |  
  |          for (std::size_t i = 0; i < type_seq.size(); ++i) 
  |          { 
  |             assert((*vnode)[i]); 
  |  
  |             switch(type_seq[i]) 
  |             { 
  |                case e_literal  : { if (details::is_literal_node         ((*vnode)[i])) continue; } break; 
  |                case e_variable : { if (details::is_variable_node        ((*vnode)[i])) continue; } break; 
  |                case e_string   : { if (details::is_generally_string_node((*vnode)[i])) continue; } break; 
  |                case e_unary    : { if (details::is_unary_node           ((*vnode)[i])) continue; } break; 
  |                case e_binary   : { if (details::is_binary_node          ((*vnode)[i])) continue; } break; 
  |                case e_function : { if (details::is_function             ((*vnode)[i])) continue; } break; 
  |                case e_null     : { if (details::is_null_node            ((*vnode)[i])) continue; } break; 
  |                case e_assert   : { if (details::is_assert_node          ((*vnode)[i])) continue; } break; 
  |                case e_sf3ext   : { if (details::is_sf3ext_node          ((*vnode)[i])) continue; } break; 
  |                case e_sf4ext   : { if (details::is_sf4ext_node          ((*vnode)[i])) continue; } break; 
  |                case e_vararg   : break; 
  |             } 
  |  
  |             return false; 
  |          } 
  |  
  |          return true; 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    inline bool is_valid(const expression<T>& expr) 
  |    { 
  |       return expr.control_block_ && !expression_helper<T>::is_null(expr); 
  |    } 
  |  
  |    namespace parser_error 
  |    { 
  |       enum error_mode 
  |       { 
  |          e_unknown   = 0, 
  |          e_syntax    = 1, 
  |          e_token     = 2, 
  |          e_numeric   = 4, 
  |          e_symtab    = 5, 
  |          e_lexer     = 6, 
  |          e_synthesis = 7, 
  |          e_helper    = 8, 
  |          e_parser    = 9 
  |       }; 
  |  
  |       struct type 
  |       { 
  |          type() 
  |          : mode(parser_error::e_unknown) 
  |          , line_no  (0) 
  |          , column_no(0) 
  |          {} 
  |  
  |          lexer::token token; 
  |          error_mode mode; 
  |          std::string diagnostic; 
  |          std::string src_location; 
  |          std::string error_line; 
  |          std::size_t line_no; 
  |          std::size_t column_no; 
  |       }; 
  |  
  |       inline type make_error(const error_mode mode, 
  |                              const std::string& diagnostic   = "", 
  |                              const std::string& src_location = "") 
  |       { 
  |          type t; 
  |          t.mode         = mode; 
  |          t.token.type   = lexer::token::e_error; 
  |          t.diagnostic   = diagnostic; 
  |          t.src_location = src_location; 
  |          exprtk_debug(("%s\n", diagnostic .c_str())); 
  |          return t; 
  |       } 
  |  
  |       inline type make_error(const error_mode mode, 
  |                              const lexer::token& tk, 
  |                              const std::string& diagnostic   = "", 
  |                              const std::string& src_location = "") 
  |       { 
  |          type t; 
  |          t.mode         = mode; 
  |          t.token        = tk; 
  |          t.diagnostic   = diagnostic; 
  |          t.src_location = src_location; 
  |          exprtk_debug(("%s\n", diagnostic .c_str())); 
  |          return t; 
  |       } 
  |  
  |       inline std::string to_str(error_mode mode) 
  |       { 
  |          switch (mode) 
  |          { 
  |             case e_unknown : return std::string("Unknown Error"); 
  |             case e_syntax  : return std::string("Syntax Error" ); 
  |             case e_token   : return std::string("Token Error"  ); 
  |             case e_numeric : return std::string("Numeric Error"); 
  |             case e_symtab  : return std::string("Symbol Error" ); 
  |             case e_lexer   : return std::string("Lexer Error"  ); 
  |             case e_helper  : return std::string("Helper Error" ); 
  |             case e_parser  : return std::string("Parser Error" ); 
  |             default        : return std::string("Unknown Error"); 
  |          } 
  |       } 
  |  
  |       inline bool update_error(type& error, const std::string& expression) 
  |       { 
  |          if ( 
  |               expression.empty()                         || 
  |               (error.token.position > expression.size()) || 
  |               (std::numeric_limits<std::size_t>::max() == error.token.position) 
  |             ) 
  |          { 
  |             return false; 
  |          } 
  |  
  |          std::size_t error_line_start = 0; 
  |  
  |          for (std::size_t i = error.token.position; i > 0; --i) 
  |          { 
  |             const details::char_t c = expression[i]; 
  |  
  |             if (('\n' == c) || ('\r' == c)) 
  |             { 
  |                error_line_start = i + 1; 
  |                break; 
  |             } 
  |          } 
  |  
  |          std::size_t next_nl_position = std::min(expression.size(), 
  |                                                  expression.find_first_of('\n',error.token.position + 1)); 
  |  
  |          error.column_no  = error.token.position - error_line_start; 
  |          error.error_line = expression.substr(error_line_start, 
  |                                               next_nl_position - error_line_start); 
  |  
  |          error.line_no = 0; 
  |  
  |          for (std::size_t i = 0; i < next_nl_position; ++i) 
  |          { 
  |             if ('\n' == expression[i]) 
  |                ++error.line_no; 
  |          } 
  |  
  |          return true; 
  |       } 
  |  
  |       inline void dump_error(const type& error) 
  |       { 
  |          printf("Position: %02d   Type: [%s]   Msg: %s\n", 
  |                 static_cast<int>(error.token.position), 
  |                 exprtk::parser_error::to_str(error.mode).c_str(), 
  |                 error.diagnostic.c_str()); 
  |       } 
  |    } 
  |  
  |    namespace details 
  |    { 
  |       template <typename Parser> 
  |       inline void disable_type_checking(Parser& p) 
  |       { 
  |          p.state_.type_check_enabled = false; 
  |       } 
  |    } 
  |  
  |    template <typename T> 
  |    class parser : public lexer::parser_helper 
  |    { 
  |    private: 
  |  
  |       enum precedence_level 
  |       { 
  |          e_level00, e_level01, e_level02, e_level03, e_level04, 
  |          e_level05, e_level06, e_level07, e_level08, e_level09, 
  |          e_level10, e_level11, e_level12, e_level13, e_level14 
  |       }; 
  |  
  |       typedef const T&                                       cref_t; 
  |       typedef const T                                        const_t; 
  |       typedef ifunction<T>                                   F; 
  |       typedef ivararg_function<T>                            VAF; 
  |       typedef igeneric_function<T>                           GF; 
  |       typedef ifunction<T>                                   ifunction_t; 
  |       typedef ivararg_function<T>                            ivararg_function_t; 
  |       typedef igeneric_function<T>                           igeneric_function_t; 
  |       typedef details::expression_node<T>                    expression_node_t; 
  |       typedef details::literal_node<T>                       literal_node_t; 
  |       typedef details::unary_node<T>                         unary_node_t; 
  |       typedef details::binary_node<T>                        binary_node_t; 
  |       typedef details::trinary_node<T>                       trinary_node_t; 
  |       typedef details::quaternary_node<T>                    quaternary_node_t; 
  |       typedef details::conditional_node<T>                   conditional_node_t; 
  |       typedef details::cons_conditional_node<T>              cons_conditional_node_t; 
  |       typedef details::while_loop_node<T>                    while_loop_node_t; 
  |       typedef details::repeat_until_loop_node<T>             repeat_until_loop_node_t; 
  |       typedef details::for_loop_node<T>                      for_loop_node_t; 
  |       typedef details::while_loop_rtc_node<T>                while_loop_rtc_node_t; 
  |       typedef details::repeat_until_loop_rtc_node<T>         repeat_until_loop_rtc_node_t; 
  |       typedef details::for_loop_rtc_node<T>                  for_loop_rtc_node_t; 
  |       #ifndef exprtk_disable_break_continue 
  |       typedef details::while_loop_bc_node<T>                 while_loop_bc_node_t; 
  |       typedef details::repeat_until_loop_bc_node<T>          repeat_until_loop_bc_node_t; 
  |       typedef details::for_loop_bc_node<T>                   for_loop_bc_node_t; 
  |       typedef details::while_loop_bc_rtc_node<T>             while_loop_bc_rtc_node_t; 
  |       typedef details::repeat_until_loop_bc_rtc_node<T>      repeat_until_loop_bc_rtc_node_t; 
  |       typedef details::for_loop_bc_rtc_node<T>               for_loop_bc_rtc_node_t; 
  |       #endif 
  |       typedef details::switch_node<T>                        switch_node_t; 
  |       typedef details::variable_node<T>                      variable_node_t; 
  |       typedef details::vector_elem_node<T>                   vector_elem_node_t; 
  |       typedef details::vector_celem_node<T>                  vector_celem_node_t; 
  |       typedef details::vector_elem_rtc_node<T>               vector_elem_rtc_node_t; 
  |       typedef details::vector_celem_rtc_node<T>              vector_celem_rtc_node_t; 
  |       typedef details::rebasevector_elem_node<T>             rebasevector_elem_node_t; 
  |       typedef details::rebasevector_celem_node<T>            rebasevector_celem_node_t; 
  |       typedef details::rebasevector_elem_rtc_node<T>         rebasevector_elem_rtc_node_t; 
  |       typedef details::rebasevector_celem_rtc_node<T>        rebasevector_celem_rtc_node_t; 
  |       typedef details::vector_node<T>                        vector_node_t; 
  |       typedef details::vector_size_node<T>                   vector_size_node_t; 
  |       typedef details::range_pack<T>                         range_t; 
  |       #ifndef exprtk_disable_string_capabilities 
  |       typedef details::stringvar_node<T>                     stringvar_node_t; 
  |       typedef details::string_literal_node<T>                string_literal_node_t; 
  |       typedef details::string_range_node<T>                  string_range_node_t; 
  |       typedef details::const_string_range_node<T>            const_string_range_node_t; 
  |       typedef details::generic_string_range_node<T>          generic_string_range_node_t; 
  |       typedef details::string_concat_node<T>                 string_concat_node_t; 
  |       typedef details::assignment_string_node<T>             assignment_string_node_t; 
  |       typedef details::assignment_string_range_node<T>       assignment_string_range_node_t; 
  |       typedef details::conditional_string_node<T>            conditional_string_node_t; 
  |       typedef details::cons_conditional_str_node<T>          cons_conditional_str_node_t; 
  |       #endif 
  |       typedef details::assignment_node<T>                    assignment_node_t; 
  |       typedef details::assignment_vec_elem_node<T>           assignment_vec_elem_node_t; 
  |       typedef details::assignment_vec_elem_rtc_node<T>       assignment_vec_elem_rtc_node_t; 
  |       typedef details::assignment_rebasevec_elem_node<T>     assignment_rebasevec_elem_node_t; 
  |       typedef details::assignment_rebasevec_elem_rtc_node<T> assignment_rebasevec_elem_rtc_node_t; 
  |       typedef details::assignment_rebasevec_celem_node<T>    assignment_rebasevec_celem_node_t; 
  |       typedef details::assignment_vec_node<T>                assignment_vec_node_t; 
  |       typedef details::assignment_vecvec_node<T>             assignment_vecvec_node_t; 
  |       typedef details::conditional_vector_node<T>            conditional_vector_node_t; 
  |       typedef details::scand_node<T>                         scand_node_t; 
  |       typedef details::scor_node<T>                          scor_node_t; 
  |       typedef lexer::token                                   token_t; 
  |       typedef expression_node_t*                             expression_node_ptr; 
  |       typedef expression<T>                                  expression_t; 
  |       typedef symbol_table<T>                                symbol_table_t; 
  |       typedef typename expression<T>::symtab_list_t          symbol_table_list_t; 
  |       typedef details::vector_holder<T>                      vector_holder_t; 
  |       typedef vector_holder_t*                               vector_holder_ptr; 
  |  
  |       typedef typename details::functor_t<T> functor_t; 
  |       typedef typename functor_t::qfunc_t    quaternary_functor_t; 
  |       typedef typename functor_t::tfunc_t    trinary_functor_t; 
  |       typedef typename functor_t::bfunc_t    binary_functor_t; 
  |       typedef typename functor_t::ufunc_t    unary_functor_t; 
  |  
  |       typedef details::operator_type operator_t; 
  |  
  |       typedef std::map<operator_t, unary_functor_t  > unary_op_map_t; 
  |       typedef std::map<operator_t, binary_functor_t > binary_op_map_t; 
  |       typedef std::map<operator_t, trinary_functor_t> trinary_op_map_t; 
  |  
  |       typedef std::map<std::string,std::pair<trinary_functor_t   ,operator_t> > sf3_map_t; 
  |       typedef std::map<std::string,std::pair<quaternary_functor_t,operator_t> > sf4_map_t; 
  |  
  |       typedef std::map<binary_functor_t,operator_t> inv_binary_op_map_t; 
  |       typedef std::multimap<std::string,details::base_operation_t,details::ilesscompare> base_ops_map_t; 
  |       typedef std::set<std::string,details::ilesscompare> disabled_func_set_t; 
  |  
  |       typedef details::T0oT1_define<T, cref_t , cref_t > vov_t; 
  |       typedef details::T0oT1_define<T, const_t, cref_t > cov_t; 
  |       typedef details::T0oT1_define<T, cref_t , const_t> voc_t; 
  |  
  |       typedef details::T0oT1oT2_define<T, cref_t , cref_t , cref_t > vovov_t; 
  |       typedef details::T0oT1oT2_define<T, cref_t , cref_t , const_t> vovoc_t; 
  |       typedef details::T0oT1oT2_define<T, cref_t , const_t, cref_t > vocov_t; 
  |       typedef details::T0oT1oT2_define<T, const_t, cref_t , cref_t > covov_t; 
  |       typedef details::T0oT1oT2_define<T, const_t, cref_t , const_t> covoc_t; 
  |       typedef details::T0oT1oT2_define<T, const_t, const_t, cref_t > cocov_t; 
  |       typedef details::T0oT1oT2_define<T, cref_t , const_t, const_t> vococ_t; 
  |  
  |       typedef details::T0oT1oT2oT3_define<T, cref_t , cref_t , cref_t , cref_t > vovovov_t; 
  |       typedef details::T0oT1oT2oT3_define<T, cref_t , cref_t , cref_t , const_t> vovovoc_t; 
  |       typedef details::T0oT1oT2oT3_define<T, cref_t , cref_t , const_t, cref_t > vovocov_t; 
  |       typedef details::T0oT1oT2oT3_define<T, cref_t , const_t, cref_t , cref_t > vocovov_t; 
  |       typedef details::T0oT1oT2oT3_define<T, const_t, cref_t , cref_t , cref_t > covovov_t; 
  |  
  |       typedef details::T0oT1oT2oT3_define<T, const_t, cref_t , const_t, cref_t > covocov_t; 
  |       typedef details::T0oT1oT2oT3_define<T, cref_t , const_t, cref_t , const_t> vocovoc_t; 
  |       typedef details::T0oT1oT2oT3_define<T, const_t, cref_t , cref_t , const_t> covovoc_t; 
  |       typedef details::T0oT1oT2oT3_define<T, cref_t , const_t, const_t, cref_t > vococov_t; 
  |  
  |       typedef results_context<T> results_context_t; 
  |  
  |       typedef parser_helper prsrhlpr_t; 
  |  
  |       struct scope_element 
  |       { 
  |          enum element_type 
  |          { 
  |             e_none    , 
  |             e_literal , 
  |             e_variable, 
  |             e_vector  , 
  |             e_vecelem , 
  |             e_string 
  |          }; 
  |  
  |          typedef details::vector_holder<T> vector_holder_t; 
  |          typedef literal_node_t*           literal_node_ptr; 
  |          typedef variable_node_t*          variable_node_ptr; 
  |          typedef vector_holder_t*          vector_holder_ptr; 
  |          typedef expression_node_t*        expression_node_ptr; 
  |          #ifndef exprtk_disable_string_capabilities 
  |          typedef stringvar_node_t*         stringvar_node_ptr; 
  |          #endif 
  |  
  |          scope_element() 
  |          : name("???") 
  |          , size (std::numeric_limits<std::size_t>::max()) 
  |          , index(std::numeric_limits<std::size_t>::max()) 
  |          , depth(std::numeric_limits<std::size_t>::max()) 
  |          , ref_count(0) 
  |          , ip_index (0) 
  |          , type     (e_none) 
  |          , active   (false) 
  |          , data     (0) 
  |          , var_node (0) 
  |          , vec_node (0) 
  |          #ifndef exprtk_disable_string_capabilities 
  |          , str_node(0) 
  |          #endif 
  |          {} 
  |  
  |          bool operator < (const scope_element& se) const 
  |          { 
  |             if (ip_index < se.ip_index) 
  |                return true; 
  |             else if (ip_index > se.ip_index) 
  |                return false; 
  |             else if (depth < se.depth) 
  |                return true; 
  |             else if (depth > se.depth) 
  |                return false; 
  |             else if (index < se.index) 
  |                return true; 
  |             else if (index > se.index) 
  |                return false; 
  |             else 
  |                return (name < se.name); 
  |          } 
  |  
  |          void clear() 
  |          { 
  |             name   = "???" 
  |             size   = std::numeric_limits<std::size_t>::max(); 
  |             index  = std::numeric_limits<std::size_t>::max(); 
  |             depth  = std::numeric_limits<std::size_t>::max(); 
  |             type   = e_none; 
  |             active = false; 
  |             ref_count = 0; 
  |             ip_index  = 0; 
  |             data      = 0; 
  |             var_node  = 0; 
  |             vec_node  = 0; 
  |             #ifndef exprtk_disable_string_capabilities 
  |             str_node  = 0; 
  |             #endif 
  |          } 
  |  
  |          std::string  name; 
  |          std::size_t  size; 
  |          std::size_t  index; 
  |          std::size_t  depth; 
  |          std::size_t  ref_count; 
  |          std::size_t  ip_index; 
  |          element_type type; 
  |          bool         active; 
  |          void*        data; 
  |          expression_node_ptr var_node; 
  |          vector_holder_ptr   vec_node; 
  |          #ifndef exprtk_disable_string_capabilities 
  |          stringvar_node_ptr str_node; 
  |          #endif 
  |       }; 
  |  
  |       class scope_element_manager 
  |       { 
  |       public: 
  |  
  |          typedef expression_node_t* expression_node_ptr; 
  |          typedef variable_node_t*   variable_node_ptr; 
  |          typedef parser<T>          parser_t; 
  |  
  |          explicit scope_element_manager(parser<T>& p) 
  |          : parser_(p) 
  |          , input_param_cnt_(0) 
  |          {} 
  |  
  |          inline std::size_t size() const 
  |          { 
  |             return element_.size(); 
  |          } 
  |  
  |          inline bool empty() const 
  |          { 
  |             return element_.empty(); 
  |          } 
  |  
  |          inline scope_element& get_element(const std::size_t& index) 
  |          { 
  |             if (index < element_.size()) 
  |                return element_[index]; 
  |             else 
  |                return null_element_; 
  |          } 
  |  
  |          inline scope_element& get_element(const std::string& var_name, 
  |                                            const std::size_t index = std::numeric_limits<std::size_t>::max()) 
  |          { 
  |             const std::size_t current_depth = parser_.state_.scope_depth; 
  |  
  |             for (std::size_t i = 0; i < element_.size(); ++i) 
  |             { 
  |                scope_element& se = element_[i]; 
  |  
  |                if (se.depth > current_depth) 
  |                   continue; 
  |                else if ( 
  |                          details::imatch(se.name, var_name) && 
  |                          (se.index == index) 
  |                        ) 
  |                   return se; 
  |             } 
  |  
  |             return null_element_; 
  |          } 
  |  
  |          inline scope_element& get_active_element(const std::string& var_name, 
  |                                                   const std::size_t index = std::numeric_limits<std::size_t>::max()) 
  |          { 
  |             const std::size_t current_depth = parser_.state_.scope_depth; 
  |  
  |             for (std::size_t i = 0; i < element_.size(); ++i) 
  |             { 
  |                scope_element& se = element_[i]; 
  |  
  |                if (se.depth > current_depth) 
  |                   continue; 
  |                else if ( 
  |                          details::imatch(se.name, var_name) && 
  |                          (se.index == index)                && 
  |                          (se.active) 
  |                        ) 
  |                   return se; 
  |             } 
  |  
  |             return null_element_; 
  |          } 
  |  
  |          inline bool add_element(const scope_element& se) 
  |          { 
  |             for (std::size_t i = 0; i < element_.size(); ++i) 
  |             { 
  |                scope_element& cse = element_[i]; 
  |  
  |                if ( 
  |                     details::imatch(cse.name, se.name) && 
  |                     (cse.depth <= se.depth)            && 
  |                     (cse.index == se.index)            && 
  |                     (cse.size  == se.size )            && 
  |                     (cse.type  == se.type )            && 
  |                     (cse.active) 
  |                   ) 
  |                   return false; 
  |             } 
  |  
  |             element_.push_back(se); 
  |             std::sort(element_.begin(),element_.end()); 
  |  
  |             return true; 
  |          } 
  |  
  |          inline void deactivate(const std::size_t& scope_depth) 
  |          { 
  |             exprtk_debug(("deactivate() - Scope depth: %d\n", 
  |                           static_cast<int>(parser_.state_.scope_depth))); 
  |  
  |             for (std::size_t i = 0; i < element_.size(); ++i) 
  |             { 
  |                scope_element& se = element_[i]; 
  |  
  |                if (se.active && (se.depth >= scope_depth)) 
  |                { 
  |                   exprtk_debug(("deactivate() - element[%02d] '%s'\n", 
  |                                 static_cast<int>(i), 
  |                                 se.name.c_str())); 
  |  
  |                   se.active = false; 
  |                } 
  |             } 
  |          } 
  |  
  |          inline void free_element(scope_element& se) 
  |          { 
  |             exprtk_debug(("free_element() - se[%s]\n", se.name.c_str())); 
  |  
  |             switch (se.type) 
  |             { 
  |                case scope_element::e_literal    : delete reinterpret_cast<T*>(se.data); 
  |                                                   delete se.var_node; 
  |                                                   break; 
  |  
  |                case scope_element::e_variable   : delete reinterpret_cast<T*>(se.data); 
  |                                                   delete se.var_node; 
  |                                                   break; 
  |  
  |                case scope_element::e_vector     : delete[] reinterpret_cast<T*>(se.data); 
  |                                                   delete se.vec_node; 
  |                                                   break; 
  |  
  |                case scope_element::e_vecelem    : delete se.var_node; 
  |                                                   break; 
  |  
  |                #ifndef exprtk_disable_string_capabilities 
  |                case scope_element::e_string     : delete reinterpret_cast<std::string*>(se.data); 
  |                                                   delete se.str_node; 
  |                                                   break; 
  |                #endif 
  |  
  |                default                          : return; 
  |             } 
  |  
  |             se.clear(); 
  |          } 
  |  
  |          inline void cleanup() 
  |          { 
  |             for (std::size_t i = 0; i < element_.size(); ++i) 
  |             { 
  |                free_element(element_[i]); 
  |             } 
  |  
  |             element_.clear(); 
  |  
  |             input_param_cnt_ = 0; 
  |          } 
  |  
  |          inline std::size_t next_ip_index() 
  |          { 
  |             return ++input_param_cnt_; 
  |          } 
  |  
  |          inline expression_node_ptr get_variable(const T& v) 
  |          { 
  |             for (std::size_t i = 0; i < element_.size(); ++i) 
  |             { 
  |                scope_element& se = element_[i]; 
  |  
  |                if ( 
  |                     se.active   && 
  |                     se.var_node && 
  |                     details::is_variable_node(se.var_node) 
  |                   ) 
  |                { 
  |                   variable_node_ptr vn = reinterpret_cast<variable_node_ptr>(se.var_node); 
  |  
  |                   if (&(vn->ref()) == (&v)) 
  |                   { 
  |                      return se.var_node; 
  |                   } 
  |                } 
  |             } 
  |  
  |             return expression_node_ptr(0); 
  |          } 
  |  
  |          inline std::string get_vector_name(const T* data) 
  |          { 
  |             for (std::size_t i = 0; i < element_.size(); ++i) 
  |             { 
  |                scope_element& se = element_[i]; 
  |  
  |                if ( 
  |                     se.active   && 
  |                     se.vec_node && 
  |                     (se.vec_node->data() == data) 
  |                   ) 
  |                { 
  |                   return se.name; 
  |                } 
  |             } 
  |  
  |             return "neo-vector" 
  |          } 
  |  
  |       private: 
  |  
  |          scope_element_manager(const scope_element_manager&) exprtk_delete; 
  |          scope_element_manager& operator=(const scope_element_manager&) exprtk_delete; 
  |  
  |          parser_t& parser_; 
  |          std::vector<scope_element> element_; 
  |          scope_element null_element_; 
  |          std::size_t input_param_cnt_; 
  |       }; 
  |  
  |       class scope_handler 
  |       { 
  |       public: 
  |  
  |          typedef parser<T> parser_t; 
  |  
  |          explicit scope_handler(parser<T>& p) 
  |          : parser_(p) 
  |          { 
  |             parser_.state_.scope_depth++; 
  |             #ifdef exprtk_enable_debugging 
  |             const std::string depth(2 * parser_.state_.scope_depth,'-'); 
  |             exprtk_debug(("%s> Scope Depth: %02d\n", 
  |                           depth.c_str(), 
  |                           static_cast<int>(parser_.state_.scope_depth))); 
  |             #endif 
  |          } 
  |  
  |         ~scope_handler() 
  |          { 
  |             parser_.sem_.deactivate(parser_.state_.scope_depth); 
  |             parser_.state_.scope_depth--; 
  |             #ifdef exprtk_enable_debugging 
  |             const std::string depth(2 * parser_.state_.scope_depth,'-'); 
  |             exprtk_debug(("<%s Scope Depth: %02d\n", 
  |                           depth.c_str(), 
  |                           static_cast<int>(parser_.state_.scope_depth))); 
  |             #endif 
  |          } 
  |  
  |       private: 
  |  
  |          scope_handler(const scope_handler&) exprtk_delete; 
  |          scope_handler& operator=(const scope_handler&) exprtk_delete; 
  |  
  |          parser_t& parser_; 
  |       }; 
  |  
  |       template <typename T_> 
  |       struct halfopen_range_policy 
  |       { 
  |          static inline bool is_within(const T_& v, const T_& begin, const T_& end) 
  |          { 
  |             assert(begin <= end); 
  |             return (begin <= v) && (v < end); 
  |          } 
  |  
  |          static inline bool is_less(const T_& v, const T_& begin) 
  |          { 
  |             return (v < begin); 
  |          } 
  |  
  |          static inline bool is_greater(const T_& v, const T_& end) 
  |          { 
  |             return (end <= v); 
  |          } 
  |  
  |          static inline bool end_inclusive() 
  |          { 
  |             return false; 
  |          } 
  |       }; 
  |  
  |       template <typename T_> 
  |       struct closed_range_policy 
  |       { 
  |          static inline bool is_within(const T_& v, const T_& begin, const T_& end) 
  |          { 
  |             assert(begin <= end); 
  |             return (begin <= v) && (v <= end); 
  |          } 
  |  
  |          static inline bool is_less(const T_& v, const T_& begin) 
  |          { 
  |             return (v < begin); 
  |          } 
  |  
  |          static inline bool is_greater(const T_& v, const T_& end) 
  |          { 
  |             return (end < v); 
  |          } 
  |  
  |          static inline bool end_inclusive() 
  |          { 
  |             return true; 
  |          } 
  |       }; 
  |  
  |       template <typename IntervalPointType, 
  |                 typename RangePolicy = halfopen_range_policy<IntervalPointType> > 
  |       class interval_container_t 
  |       { 
  |       public: 
  |  
  |          typedef IntervalPointType interval_point_t; 
  |          typedef std::pair<interval_point_t, interval_point_t> interval_t; 
  |          typedef std::map<interval_point_t, interval_t> interval_map_t; 
  |          typedef typename interval_map_t::const_iterator interval_map_citr_t; 
  |  
  |          std::size_t size() const 
  |          { 
  |             return interval_map_.size(); 
  |          } 
  |  
  |          void reset() 
  |          { 
  |             interval_map_.clear(); 
  |          } 
  |  
  |          bool in_interval(const interval_point_t point, interval_t& interval) const 
  |          { 
  |             interval_map_citr_t itr = RangePolicy::end_inclusive() ? 
  |                                       interval_map_.lower_bound(point): 
  |                                       interval_map_.upper_bound(point); 
  |  
  |             for (; itr != interval_map_.end(); ++itr) 
  |             { 
  |                const interval_point_t& begin = itr->second.first; 
  |                const interval_point_t& end   = itr->second.second; 
  |  
  |                if (RangePolicy::is_within(point, begin, end)) 
  |                { 
  |                   interval = interval_t(begin,end); 
  |                   return true; 
  |                } 
  |                else if (RangePolicy::is_greater(point, end)) 
  |                { 
  |                   break; 
  |                } 
  |             } 
  |  
  |             return false; 
  |          } 
  |  
  |          bool in_interval(const interval_point_t point) const 
  |          { 
  |             interval_t interval; 
  |             return in_interval(point,interval); 
  |          } 
  |  
  |          bool add_interval(const interval_point_t begin, const interval_point_t end) 
  |          { 
  |             if ((end <= begin) || in_interval(begin) || in_interval(end)) 
  |             { 
  |                return false; 
  |             } 
  |  
  |             interval_map_[end] = std::make_pair(begin, end); 
  |  
  |             return true; 
  |          } 
  |  
  |          bool add_interval(const interval_t interval) 
  |          { 
  |             return add_interval(interval.first, interval.second); 
  |          } 
  |  
  |       private: 
  |  
  |          interval_map_t interval_map_; 
  |       }; 
  |  
  |       class stack_limit_handler 
  |       { 
  |       public: 
  |  
  |          typedef parser<T> parser_t; 
  |  
  |          explicit stack_limit_handler(parser<T>& p) 
  |          : parser_(p) 
  |          , limit_exceeded_(false) 
  |          { 
  |             if (++parser_.state_.stack_depth > parser_.settings_.max_stack_depth_) 
  |             { 
  |                limit_exceeded_ = true; 
  |                parser_.set_error(make_error( 
  |                   parser_error::e_parser, 
  |                   "ERR000 - Current stack depth " + details::to_str(parser_.state_.stack_depth) + 
  |                   " exceeds maximum allowed stack depth of " + details::to_str(parser_.settings_.max_stack_depth_), 
  |                   exprtk_error_location)); 
  |             } 
  |          } 
  |  
  |         ~stack_limit_handler() 
  |          { 
  |             assert(parser_.state_.stack_depth > 0); 
  |             parser_.state_.stack_depth--; 
  |          } 
  |  
  |          bool operator!() 
  |          { 
  |             return limit_exceeded_; 
  |          } 
  |  
  |       private: 
  |  
  |          stack_limit_handler(const stack_limit_handler&) exprtk_delete; 
  |          stack_limit_handler& operator=(const stack_limit_handler&) exprtk_delete; 
  |  
  |          parser_t& parser_; 
  |          bool limit_exceeded_; 
  |       }; 
  |  
  |       struct symtab_store 
  |       { 
  |          symbol_table_list_t symtab_list_; 
  |  
  |          typedef typename symbol_table_t::local_data_t local_data_t; 
  |          typedef typename symbol_table_t::variable_ptr variable_ptr; 
  |          typedef typename symbol_table_t::function_ptr function_ptr; 
  |          #ifndef exprtk_disable_string_capabilities 
  |          typedef typename symbol_table_t::stringvar_ptr stringvar_ptr; 
  |          #endif 
  |          typedef typename symbol_table_t::vector_holder_ptr    vector_holder_ptr; 
  |          typedef typename symbol_table_t::vararg_function_ptr  vararg_function_ptr; 
  |          typedef typename symbol_table_t::generic_function_ptr generic_function_ptr; 
  |  
  |          struct variable_context 
  |          { 
  |             variable_context() 
  |             : symbol_table(0) 
  |             , variable(0) 
  |             {} 
  |  
  |             const symbol_table_t* symbol_table; 
  |             variable_ptr variable; 
  |          }; 
  |  
  |          struct vector_context 
  |          { 
  |             vector_context() 
  |             : symbol_table(0) 
  |             , vector_holder(0) 
  |             {} 
  |  
  |             const symbol_table_t* symbol_table; 
  |             vector_holder_ptr vector_holder; 
  |          }; 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          struct string_context 
  |          { 
  |             string_context() 
  |             : symbol_table(0) 
  |             , str_var(0) 
  |             {} 
  |  
  |             const symbol_table_t* symbol_table; 
  |             stringvar_ptr str_var; 
  |          }; 
  |          #endif 
  |  
  |          inline bool empty() const 
  |          { 
  |             return symtab_list_.empty(); 
  |          } 
  |  
  |          inline void clear() 
  |          { 
  |             symtab_list_.clear(); 
  |          } 
  |  
  |          inline bool valid() const 
  |          { 
  |             if (!empty()) 
  |             { 
  |                for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |                { 
  |                   if (symtab_list_[i].valid()) 
  |                      return true; 
  |                } 
  |             } 
  |  
  |             return false; 
  |          } 
  |  
  |          inline bool valid_symbol(const std::string& symbol) const 
  |          { 
  |             if (!symtab_list_.empty()) 
  |                return symtab_list_[0].valid_symbol(symbol); 
  |             else 
  |                return false; 
  |          } 
  |  
  |          inline bool valid_function_name(const std::string& symbol) const 
  |          { 
  |             if (!symtab_list_.empty()) 
  |                return symtab_list_[0].valid_function(symbol); 
  |             else 
  |                return false; 
  |          } 
  |  
  |          inline variable_context get_variable_context(const std::string& variable_name) const 
  |          { 
  |             variable_context result; 
  |  
  |             if (valid_symbol(variable_name)) 
  |             { 
  |                for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |                { 
  |                   if (!symtab_list_[i].valid()) 
  |                   { 
  |                      continue; 
  |                   } 
  |  
  |                   result.variable = local_data(i) 
  |                                        .variable_store.get(variable_name); 
  |                   if (result.variable) 
  |                   { 
  |                      result.symbol_table = &symtab_list_[i]; 
  |                      break; 
  |                   } 
  |                } 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          inline variable_ptr get_variable(const std::string& variable_name) const 
  |          { 
  |             if (!valid_symbol(variable_name)) 
  |                return reinterpret_cast<variable_ptr>(0); 
  |  
  |             variable_ptr result = reinterpret_cast<variable_ptr>(0); 
  |  
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                   continue; 
  |                else 
  |                   result = local_data(i) 
  |                               .variable_store.get(variable_name); 
  |  
  |                if (result) break; 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          inline variable_ptr get_variable(const T& var_ref) const 
  |          { 
  |             variable_ptr result = reinterpret_cast<variable_ptr>(0); 
  |  
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                   continue; 
  |                else 
  |                   result = local_data(i).variable_store 
  |                               .get_from_varptr(reinterpret_cast<const void*>(&var_ref)); 
  |  
  |                if (result) break; 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          inline string_context get_string_context(const std::string& string_name) const 
  |          { 
  |             string_context result; 
  |  
  |             if (!valid_symbol(string_name)) 
  |                return result; 
  |  
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                { 
  |                   continue; 
  |                } 
  |  
  |                result.str_var = local_data(i).stringvar_store.get(string_name); 
  |  
  |                if (result.str_var) 
  |                { 
  |                   result.symbol_table = &symtab_list_[i]; 
  |                   break; 
  |                } 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          inline stringvar_ptr get_stringvar(const std::string& string_name) const 
  |          { 
  |             if (!valid_symbol(string_name)) 
  |                return reinterpret_cast<stringvar_ptr>(0); 
  |  
  |             stringvar_ptr result = reinterpret_cast<stringvar_ptr>(0); 
  |  
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                   continue; 
  |                else 
  |                   result = local_data(i) 
  |                               .stringvar_store.get(string_name); 
  |  
  |                if (result) break; 
  |             } 
  |  
  |             return result; 
  |          } 
  |          #endif 
  |  
  |          inline function_ptr get_function(const std::string& function_name) const 
  |          { 
  |             if (!valid_function_name(function_name)) 
  |                return reinterpret_cast<function_ptr>(0); 
  |  
  |             function_ptr result = reinterpret_cast<function_ptr>(0); 
  |  
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                   continue; 
  |                else 
  |                   result = local_data(i) 
  |                               .function_store.get(function_name); 
  |  
  |                if (result) break; 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          inline vararg_function_ptr get_vararg_function(const std::string& vararg_function_name) const 
  |          { 
  |             if (!valid_function_name(vararg_function_name)) 
  |                return reinterpret_cast<vararg_function_ptr>(0); 
  |  
  |             vararg_function_ptr result = reinterpret_cast<vararg_function_ptr>(0); 
  |  
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                   continue; 
  |                else 
  |                   result = local_data(i) 
  |                               .vararg_function_store.get(vararg_function_name); 
  |  
  |                if (result) break; 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          inline generic_function_ptr get_generic_function(const std::string& function_name) const 
  |          { 
  |             if (!valid_function_name(function_name)) 
  |                return reinterpret_cast<generic_function_ptr>(0); 
  |  
  |             generic_function_ptr result = reinterpret_cast<generic_function_ptr>(0); 
  |  
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                   continue; 
  |                else 
  |                   result = local_data(i) 
  |                               .generic_function_store.get(function_name); 
  |  
  |                if (result) break; 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          inline generic_function_ptr get_string_function(const std::string& function_name) const 
  |          { 
  |             if (!valid_function_name(function_name)) 
  |                return reinterpret_cast<generic_function_ptr>(0); 
  |  
  |             generic_function_ptr result = reinterpret_cast<generic_function_ptr>(0); 
  |  
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                   continue; 
  |                else 
  |                   result = 
  |                      local_data(i).string_function_store.get(function_name); 
  |  
  |                if (result) break; 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          inline generic_function_ptr get_overload_function(const std::string& function_name) const 
  |          { 
  |             if (!valid_function_name(function_name)) 
  |                return reinterpret_cast<generic_function_ptr>(0); 
  |  
  |             generic_function_ptr result = reinterpret_cast<generic_function_ptr>(0); 
  |  
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                   continue; 
  |                else 
  |                   result = 
  |                      local_data(i).overload_function_store.get(function_name); 
  |  
  |                if (result) break; 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          inline vector_context get_vector_context(const std::string& vector_name) const 
  |          { 
  |             vector_context result; 
  |             if (!valid_symbol(vector_name)) 
  |                return result; 
  |  
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                { 
  |                   continue; 
  |                } 
  |  
  |                result.vector_holder = local_data(i).vector_store.get(vector_name); 
  |  
  |                if (result.vector_holder) 
  |                { 
  |                   result.symbol_table = &symtab_list_[i]; 
  |                   break; 
  |                } 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          inline vector_holder_ptr get_vector(const std::string& vector_name) const 
  |          { 
  |             if (!valid_symbol(vector_name)) 
  |                return reinterpret_cast<vector_holder_ptr>(0); 
  |  
  |             vector_holder_ptr result = reinterpret_cast<vector_holder_ptr>(0); 
  |  
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                { 
  |                   continue; 
  |                } 
  |  
  |                result = local_data(i).vector_store.get(vector_name); 
  |  
  |                if (result) 
  |                { 
  |                   break; 
  |                } 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          inline bool is_constant_node(const std::string& symbol_name) const 
  |          { 
  |             if (!valid_symbol(symbol_name)) 
  |                return false; 
  |  
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                { 
  |                   continue; 
  |                } 
  |  
  |                if (local_data(i).variable_store.is_constant(symbol_name)) 
  |                { 
  |                   return true; 
  |                } 
  |             } 
  |  
  |             return false; 
  |          } 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          inline bool is_constant_string(const std::string& symbol_name) const 
  |          { 
  |             if (!valid_symbol(symbol_name)) 
  |                return false; 
  |  
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                   continue; 
  |                else if (!local_data(i).stringvar_store.symbol_exists(symbol_name)) 
  |                   continue; 
  |                else if (local_data(i).stringvar_store.is_constant(symbol_name)) 
  |                   return true; 
  |             } 
  |  
  |             return false; 
  |          } 
  |          #endif 
  |  
  |          inline bool symbol_exists(const std::string& symbol) const 
  |          { 
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                { 
  |                   continue; 
  |                } 
  |  
  |                if (symtab_list_[i].symbol_exists(symbol)) 
  |                { 
  |                   return true; 
  |                } 
  |             } 
  |  
  |             return false; 
  |          } 
  |  
  |          inline bool is_variable(const std::string& variable_name) const 
  |          { 
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                   continue; 
  |                else if ( 
  |                          symtab_list_[i].local_data().variable_store 
  |                            .symbol_exists(variable_name) 
  |                        ) 
  |                   return true; 
  |             } 
  |  
  |             return false; 
  |          } 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          inline bool is_stringvar(const std::string& stringvar_name) const 
  |          { 
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                   continue; 
  |                else if ( 
  |                          symtab_list_[i].local_data().stringvar_store 
  |                            .symbol_exists(stringvar_name) 
  |                        ) 
  |                   return true; 
  |             } 
  |  
  |             return false; 
  |          } 
  |  
  |          inline bool is_conststr_stringvar(const std::string& symbol_name) const 
  |          { 
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                   continue; 
  |                else if ( 
  |                          symtab_list_[i].local_data().stringvar_store 
  |                            .symbol_exists(symbol_name) 
  |                        ) 
  |                { 
  |                   return ( 
  |                            local_data(i).stringvar_store.symbol_exists(symbol_name) || 
  |                            local_data(i).stringvar_store.is_constant  (symbol_name) 
  |                          ); 
  |  
  |                } 
  |             } 
  |  
  |             return false; 
  |          } 
  |          #endif 
  |  
  |          inline bool is_function(const std::string& function_name) const 
  |          { 
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                   continue; 
  |                else if ( 
  |                          local_data(i).vararg_function_store 
  |                            .symbol_exists(function_name) 
  |                        ) 
  |                   return true; 
  |             } 
  |  
  |             return false; 
  |          } 
  |  
  |          inline bool is_vararg_function(const std::string& vararg_function_name) const 
  |          { 
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                   continue; 
  |                else if ( 
  |                          local_data(i).vararg_function_store 
  |                            .symbol_exists(vararg_function_name) 
  |                        ) 
  |                   return true; 
  |             } 
  |  
  |             return false; 
  |          } 
  |  
  |          inline bool is_vector(const std::string& vector_name) const 
  |          { 
  |             for (std::size_t i = 0; i < symtab_list_.size(); ++i) 
  |             { 
  |                if (!symtab_list_[i].valid()) 
  |                   continue; 
  |                else if ( 
  |                          local_data(i).vector_store 
  |                            .symbol_exists(vector_name) 
  |                        ) 
  |                   return true; 
  |             } 
  |  
  |             return false; 
  |          } 
  |  
  |          inline std::string get_variable_name(const expression_node_ptr& ptr) const 
  |          { 
  |             return local_data().variable_store.entity_name(ptr); 
  |          } 
  |  
  |          inline std::string get_vector_name(const vector_holder_ptr& ptr) const 
  |          { 
  |             return local_data().vector_store.entity_name(ptr); 
  |          } 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          inline std::string get_stringvar_name(const expression_node_ptr& ptr) const 
  |          { 
  |             return local_data().stringvar_store.entity_name(ptr); 
  |          } 
  |  
  |          inline std::string get_conststr_stringvar_name(const expression_node_ptr& ptr) const 
  |          { 
  |             return local_data().stringvar_store.entity_name(ptr); 
  |          } 
  |          #endif 
  |  
  |          inline local_data_t& local_data(const std::size_t& index = 0) 
  |          { 
  |             return symtab_list_[index].local_data(); 
  |          } 
  |  
  |          inline const local_data_t& local_data(const std::size_t& index = 0) const 
  |          { 
  |             return symtab_list_[index].local_data(); 
  |          } 
  |  
  |          inline symbol_table_t& get_symbol_table(const std::size_t& index = 0) 
  |          { 
  |             return symtab_list_[index]; 
  |          } 
  |       }; 
  |  
  |       struct parser_state 
  |       { 
  |          parser_state() 
  |          : type_check_enabled(true) 
  |          { 
  |             reset(); 
  |          } 
  |  
  |          void reset() 
  |          { 
  |             parsing_return_stmt     = false; 
  |             parsing_break_stmt      = false; 
  |             parsing_assert_stmt     = false; 
  |             return_stmt_present     = false; 
  |             side_effect_present     = false; 
  |             scope_depth             = 0; 
  |             stack_depth             = 0; 
  |             parsing_loop_stmt_count = 0; 
  |          } 
  |  
  |          #ifndef exprtk_enable_debugging 
  |          void activate_side_effect(const std::string&) 
  |          #else 
  |          void activate_side_effect(const std::string& source) 
  |          #endif 
  |          { 
  |             if (!side_effect_present) 
  |             { 
  |                side_effect_present = true; 
  |  
  |                exprtk_debug(("activate_side_effect() - caller: %s\n", source.c_str())); 
  |             } 
  |          } 
  |  
  |          bool parsing_return_stmt; 
  |          bool parsing_break_stmt; 
  |          bool parsing_assert_stmt; 
  |          bool return_stmt_present; 
  |          bool side_effect_present; 
  |          bool type_check_enabled; 
  |          std::size_t scope_depth; 
  |          std::size_t stack_depth; 
  |          std::size_t parsing_loop_stmt_count; 
  |       }; 
  |  
  |    public: 
  |  
  |       struct unknown_symbol_resolver 
  |       { 
  |  
  |          enum usr_symbol_type 
  |          { 
  |             e_usr_unknown_type  = 0, 
  |             e_usr_variable_type = 1, 
  |             e_usr_constant_type = 2 
  |          }; 
  |  
  |          enum usr_mode 
  |          { 
  |             e_usrmode_default  = 0, 
  |             e_usrmode_extended = 1 
  |          }; 
  |  
  |          usr_mode mode; 
  |  
  |          unknown_symbol_resolver(const usr_mode m = e_usrmode_default) 
  |          : mode(m) 
  |          {} 
  |  
  |          virtual ~unknown_symbol_resolver() 
  |          {} 
  |  
  |          virtual bool process(const std::string& /*unknown_symbol*/, 
  |                               usr_symbol_type&   st, 
  |                               T&                 default_value, 
  |                               std::string&       error_message) 
  |          { 
  |             if (e_usrmode_default != mode) 
  |                return false; 
  |  
  |             st = e_usr_variable_type; 
  |             default_value = T(0); 
  |             error_message.clear(); 
  |  
  |             return true; 
  |          } 
  |  
  |          virtual bool process(const std::string& /* unknown_symbol */, 
  |                               symbol_table_t&    /* symbol_table   */, 
  |                               std::string&       /* error_message  */) 
  |          { 
  |             return false; 
  |          } 
  |       }; 
  |  
  |       enum collect_type 
  |       { 
  |          e_ct_none        = 0, 
  |          e_ct_variables   = 1, 
  |          e_ct_functions   = 2, 
  |          e_ct_assignments = 4 
  |       }; 
  |  
  |       enum symbol_type 
  |       { 
  |          e_st_unknown        = 0, 
  |          e_st_variable       = 1, 
  |          e_st_vector         = 2, 
  |          e_st_vecelem        = 3, 
  |          e_st_string         = 4, 
  |          e_st_function       = 5, 
  |          e_st_local_variable = 6, 
  |          e_st_local_vector   = 7, 
  |          e_st_local_string   = 8 
  |       }; 
  |  
  |       class dependent_entity_collector 
  |       { 
  |       public: 
  |  
  |          typedef std::pair<std::string,symbol_type> symbol_t; 
  |          typedef std::vector<symbol_t> symbol_list_t; 
  |  
  |          dependent_entity_collector(const std::size_t options = e_ct_none) 
  |          : options_(options) 
  |          , collect_variables_  ((options_ & e_ct_variables  ) == e_ct_variables  ) 
  |          , collect_functions_  ((options_ & e_ct_functions  ) == e_ct_functions  ) 
  |          , collect_assignments_((options_ & e_ct_assignments) == e_ct_assignments) 
  |          , return_present_   (false) 
  |          , final_stmt_return_(false) 
  |          {} 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          inline std::size_t symbols(Sequence<symbol_t,Allocator>& symbols_list) 
  |          { 
  |             if (!collect_variables_ && !collect_functions_) 
  |                return 0; 
  |             else if (symbol_name_list_.empty()) 
  |                return 0; 
  |  
  |             for (std::size_t i = 0; i < symbol_name_list_.size(); ++i) 
  |             { 
  |                details::case_normalise(symbol_name_list_[i].first); 
  |             } 
  |  
  |             std::sort(symbol_name_list_.begin(), symbol_name_list_.end()); 
  |  
  |             std::unique_copy 
  |             ( 
  |                symbol_name_list_.begin(), 
  |                symbol_name_list_.end  (), 
  |                std::back_inserter(symbols_list) 
  |             ); 
  |  
  |             return symbols_list.size(); 
  |          } 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          inline std::size_t assignment_symbols(Sequence<symbol_t,Allocator>& assignment_list) 
  |          { 
  |             if (!collect_assignments_) 
  |                return 0; 
  |             else if (assignment_name_list_.empty()) 
  |                return 0; 
  |  
  |             for (std::size_t i = 0; i < assignment_name_list_.size(); ++i) 
  |             { 
  |                details::case_normalise(assignment_name_list_[i].first); 
  |             } 
  |  
  |             std::sort(assignment_name_list_.begin(),assignment_name_list_.end()); 
  |  
  |             std::unique_copy 
  |             ( 
  |                assignment_name_list_.begin(), 
  |                assignment_name_list_.end  (), 
  |                std::back_inserter(assignment_list) 
  |             ); 
  |  
  |             return assignment_list.size(); 
  |          } 
  |  
  |          void clear() 
  |          { 
  |             symbol_name_list_    .clear(); 
  |             assignment_name_list_.clear(); 
  |             retparam_list_       .clear(); 
  |             return_present_    = false; 
  |             final_stmt_return_ = false; 
  |          } 
  |  
  |          bool& collect_variables() 
  |          { 
  |             return collect_variables_; 
  |          } 
  |  
  |          bool& collect_functions() 
  |          { 
  |             return collect_functions_; 
  |          } 
  |  
  |          bool& collect_assignments() 
  |          { 
  |             return collect_assignments_; 
  |          } 
  |  
  |          bool return_present() const 
  |          { 
  |             return return_present_; 
  |          } 
  |  
  |          bool final_stmt_return() const 
  |          { 
  |             return final_stmt_return_; 
  |          } 
  |  
  |          typedef std::vector<std::string> retparam_list_t; 
  |  
  |          retparam_list_t return_param_type_list() const 
  |          { 
  |             return retparam_list_; 
  |          } 
  |  
  |       private: 
  |  
  |          inline void add_symbol(const std::string& symbol, const symbol_type st) 
  |          { 
  |             switch (st) 
  |             { 
  |                case e_st_variable       : 
  |                case e_st_vector         : 
  |                case e_st_string         : 
  |                case e_st_local_variable : 
  |                case e_st_local_vector   : 
  |                case e_st_local_string   : if (collect_variables_) 
  |                                              symbol_name_list_ 
  |                                                 .push_back(std::make_pair(symbol, st)); 
  |                                           break; 
  |  
  |                case e_st_function       : if (collect_functions_) 
  |                                              symbol_name_list_ 
  |                                                 .push_back(std::make_pair(symbol, st)); 
  |                                           break; 
  |  
  |                default                  : return; 
  |             } 
  |          } 
  |  
  |          inline void add_assignment(const std::string& symbol, const symbol_type st) 
  |          { 
  |             switch (st) 
  |             { 
  |                case e_st_variable       : 
  |                case e_st_vector         : 
  |                case e_st_string         : if (collect_assignments_) 
  |                                              assignment_name_list_ 
  |                                                 .push_back(std::make_pair(symbol, st)); 
  |                                           break; 
  |  
  |                default                  : return; 
  |             } 
  |          } 
  |  
  |          std::size_t options_; 
  |          bool collect_variables_; 
  |          bool collect_functions_; 
  |          bool collect_assignments_; 
  |          bool return_present_; 
  |          bool final_stmt_return_; 
  |          symbol_list_t symbol_name_list_; 
  |          symbol_list_t assignment_name_list_; 
  |          retparam_list_t retparam_list_; 
  |  
  |          friend class parser<T>; 
  |       }; 
  |  
  |       class settings_store 
  |       { 
  |       private: 
  |  
  |          typedef std::set<std::string,details::ilesscompare> disabled_entity_set_t; 
  |          typedef disabled_entity_set_t::iterator des_itr_t; 
  |  
  |       public: 
  |  
  |          enum settings_compilation_options 
  |          { 
  |             e_unknown              =    0, 
  |             e_replacer             =    1, 
  |             e_joiner               =    2, 
  |             e_numeric_check        =    4, 
  |             e_bracket_check        =    8, 
  |             e_sequence_check       =   16, 
  |             e_commutative_check    =   32, 
  |             e_strength_reduction   =   64, 
  |             e_disable_vardef       =  128, 
  |             e_collect_vars         =  256, 
  |             e_collect_funcs        =  512, 
  |             e_collect_assings      = 1024, 
  |             e_disable_usr_on_rsrvd = 2048, 
  |             e_disable_zero_return  = 4096 
  |          }; 
  |  
  |          enum settings_base_funcs 
  |          { 
  |             e_bf_unknown = 0, 
  |             e_bf_abs       , e_bf_acos     , e_bf_acosh    , e_bf_asin    , 
  |             e_bf_asinh     , e_bf_atan     , e_bf_atan2    , e_bf_atanh   , 
  |             e_bf_avg       , e_bf_ceil     , e_bf_clamp    , e_bf_cos     , 
  |             e_bf_cosh      , e_bf_cot      , e_bf_csc      , e_bf_equal   , 
  |             e_bf_erf       , e_bf_erfc     , e_bf_exp      , e_bf_expm1   , 
  |             e_bf_floor     , e_bf_frac     , e_bf_hypot    , e_bf_iclamp  , 
  |             e_bf_like      , e_bf_log      , e_bf_log10    , e_bf_log1p   , 
  |             e_bf_log2      , e_bf_logn     , e_bf_mand     , e_bf_max     , 
  |             e_bf_min       , e_bf_mod      , e_bf_mor      , e_bf_mul     , 
  |             e_bf_ncdf      , e_bf_pow      , e_bf_root     , e_bf_round   , 
  |             e_bf_roundn    , e_bf_sec      , e_bf_sgn      , e_bf_sin     , 
  |             e_bf_sinc      , e_bf_sinh     , e_bf_sqrt     , e_bf_sum     , 
  |             e_bf_swap      , e_bf_tan      , e_bf_tanh     , e_bf_trunc   , 
  |             e_bf_not_equal , e_bf_inrange  , e_bf_deg2grad , e_bf_deg2rad , 
  |             e_bf_rad2deg   , e_bf_grad2deg 
  |          }; 
  |  
  |          enum settings_control_structs 
  |          { 
  |             e_ctrl_unknown = 0, 
  |             e_ctrl_ifelse, 
  |             e_ctrl_switch, 
  |             e_ctrl_for_loop, 
  |             e_ctrl_while_loop, 
  |             e_ctrl_repeat_loop, 
  |             e_ctrl_return 
  |          }; 
  |  
  |          enum settings_logic_opr 
  |          { 
  |             e_logic_unknown = 0, 
  |             e_logic_and, e_logic_nand , e_logic_nor , 
  |             e_logic_not, e_logic_or   , e_logic_xnor, 
  |             e_logic_xor, e_logic_scand, e_logic_scor 
  |          }; 
  |  
  |          enum settings_arithmetic_opr 
  |          { 
  |             e_arith_unknown = 0, 
  |             e_arith_add, e_arith_sub, e_arith_mul, 
  |             e_arith_div, e_arith_mod, e_arith_pow 
  |          }; 
  |  
  |          enum settings_assignment_opr 
  |          { 
  |             e_assign_unknown = 0, 
  |             e_assign_assign, e_assign_addass, e_assign_subass, 
  |             e_assign_mulass, e_assign_divass, e_assign_modass 
  |          }; 
  |  
  |          enum settings_inequality_opr 
  |          { 
  |             e_ineq_unknown = 0, 
  |             e_ineq_lt   , e_ineq_lte, e_ineq_eq    , 
  |             e_ineq_equal, e_ineq_ne , e_ineq_nequal, 
  |             e_ineq_gte  , e_ineq_gt 
  |          }; 
  |  
  |          static const std::size_t default_compile_all_opts = 
  |                                      e_replacer          + 
  |                                      e_joiner            + 
  |                                      e_numeric_check     + 
  |                                      e_bracket_check     + 
  |                                      e_sequence_check    + 
  |                                      e_commutative_check + 
  |                                      e_strength_reduction; 
  |  
  |          settings_store(const std::size_t compile_options = default_compile_all_opts) 
  |          : max_stack_depth_(400) 
  |          , max_node_depth_(10000) 
  |          , max_local_vector_size_(2000000000) 
  |          { 
  |            load_compile_options(compile_options); 
  |          } 
  |  
  |          settings_store& enable_all_base_functions() 
  |          { 
  |             disabled_func_set_.clear(); 
  |             return (*this); 
  |          } 
  |  
  |          settings_store& enable_all_control_structures() 
  |          { 
  |             disabled_ctrl_set_.clear(); 
  |             return (*this); 
  |          } 
  |  
  |          settings_store& enable_all_logic_ops() 
  |          { 
  |             disabled_logic_set_.clear(); 
  |             return (*this); 
  |          } 
  |  
  |          settings_store& enable_all_arithmetic_ops() 
  |          { 
  |             disabled_arithmetic_set_.clear(); 
  |             return (*this); 
  |          } 
  |  
  |          settings_store& enable_all_assignment_ops() 
  |          { 
  |             disabled_assignment_set_.clear(); 
  |             return (*this); 
  |          } 
  |  
  |          settings_store& enable_all_inequality_ops() 
  |          { 
  |             disabled_inequality_set_.clear(); 
  |             return (*this); 
  |          } 
  |  
  |          settings_store& enable_local_vardef() 
  |          { 
  |             disable_vardef_ = false; 
  |             return (*this); 
  |          } 
  |  
  |          settings_store& enable_commutative_check() 
  |          { 
  |             enable_commutative_check_ = true; 
  |             return (*this); 
  |          } 
  |  
  |          settings_store& enable_strength_reduction() 
  |          { 
  |             enable_strength_reduction_ = true; 
  |             return (*this); 
  |          } 
  |  
  |          settings_store& disable_all_base_functions() 
  |          { 
  |             std::copy(details::base_function_list, 
  |                       details::base_function_list + details::base_function_list_size, 
  |                       std::insert_iterator<disabled_entity_set_t> 
  |                          (disabled_func_set_, disabled_func_set_.begin())); 
  |             return (*this); 
  |          } 
  |  
  |          settings_store& disable_all_control_structures() 
  |          { 
  |             std::copy(details::cntrl_struct_list, 
  |                       details::cntrl_struct_list + details::cntrl_struct_list_size, 
  |                       std::insert_iterator<disabled_entity_set_t> 
  |                          (disabled_ctrl_set_, disabled_ctrl_set_.begin())); 
  |             return (*this); 
  |          } 
  |  
  |          settings_store& disable_all_logic_ops() 
  |          { 
  |             std::copy(details::logic_ops_list, 
  |                       details::logic_ops_list + details::logic_ops_list_size, 
  |                       std::insert_iterator<disabled_entity_set_t> 
  |                         (disabled_logic_set_, disabled_logic_set_.begin())); 
  |             return (*this); 
  |          } 
  |  
  |          settings_store& disable_all_arithmetic_ops() 
  |          { 
  |             std::copy(details::arithmetic_ops_list, 
  |                       details::arithmetic_ops_list + details::arithmetic_ops_list_size, 
  |                       std::insert_iterator<disabled_entity_set_t> 
  |                          (disabled_arithmetic_set_, disabled_arithmetic_set_.begin())); 
  |             return (*this); 
  |          } 
  |  
  |          settings_store& disable_all_assignment_ops() 
  |          { 
  |             std::copy(details::assignment_ops_list, 
  |                       details::assignment_ops_list + details::assignment_ops_list_size, 
  |                       std::insert_iterator<disabled_entity_set_t> 
  |                          (disabled_assignment_set_, disabled_assignment_set_.begin())); 
  |             return (*this); 
  |          } 
  |  
  |          settings_store& disable_all_inequality_ops() 
  |          { 
  |             std::copy(details::inequality_ops_list, 
  |                       details::inequality_ops_list + details::inequality_ops_list_size, 
  |                       std::insert_iterator<disabled_entity_set_t> 
  |                          (disabled_inequality_set_, disabled_inequality_set_.begin())); 
  |             return (*this); 
  |          } 
  |  
  |          settings_store& disable_local_vardef() 
  |          { 
  |             disable_vardef_ = true; 
  |             return (*this); 
  |          } 
  |  
  |          settings_store& disable_commutative_check() 
  |          { 
  |             enable_commutative_check_ = false; 
  |             return (*this); 
  |          } 
  |  
  |          settings_store& disable_strength_reduction() 
  |          { 
  |             enable_strength_reduction_ = false; 
  |             return (*this); 
  |          } 
  |  
  |          bool replacer_enabled           () const { return enable_replacer_;           } 
  |          bool commutative_check_enabled  () const { return enable_commutative_check_;  } 
  |          bool joiner_enabled             () const { return enable_joiner_;             } 
  |          bool numeric_check_enabled      () const { return enable_numeric_check_;      } 
  |          bool bracket_check_enabled      () const { return enable_bracket_check_;      } 
  |          bool sequence_check_enabled     () const { return enable_sequence_check_;     } 
  |          bool strength_reduction_enabled () const { return enable_strength_reduction_; } 
  |          bool collect_variables_enabled  () const { return enable_collect_vars_;       } 
  |          bool collect_functions_enabled  () const { return enable_collect_funcs_;      } 
  |          bool collect_assignments_enabled() const { return enable_collect_assings_;    } 
  |          bool vardef_disabled            () const { return disable_vardef_;            } 
  |          bool rsrvd_sym_usr_disabled     () const { return disable_rsrvd_sym_usr_;     } 
  |          bool zero_return_disabled       () const { return disable_zero_return_;       } 
  |  
  |          bool function_enabled(const std::string& function_name) const 
  |          { 
  |             if (disabled_func_set_.empty()) 
  |                return true; 
  |             else 
  |                return (disabled_func_set_.end() == disabled_func_set_.find(function_name)); 
  |          } 
  |  
  |          bool control_struct_enabled(const std::string& control_struct) const 
  |          { 
  |             if (disabled_ctrl_set_.empty()) 
  |                return true; 
  |             else 
  |                return (disabled_ctrl_set_.end() == disabled_ctrl_set_.find(control_struct)); 
  |          } 
  |  
  |          bool logic_enabled(const std::string& logic_operation) const 
  |          { 
  |             if (disabled_logic_set_.empty()) 
  |                return true; 
  |             else 
  |                return (disabled_logic_set_.end() == disabled_logic_set_.find(logic_operation)); 
  |          } 
  |  
  |          bool arithmetic_enabled(const details::operator_type& arithmetic_operation) const 
  |          { 
  |             if (disabled_logic_set_.empty()) 
  |                return true; 
  |             else 
  |                return disabled_arithmetic_set_.end() == disabled_arithmetic_set_ 
  |                                                             .find(arith_opr_to_string(arithmetic_operation)); 
  |          } 
  |  
  |          bool assignment_enabled(const details::operator_type& assignment) const 
  |          { 
  |             if (disabled_assignment_set_.empty()) 
  |                return true; 
  |             else 
  |                return disabled_assignment_set_.end() == disabled_assignment_set_ 
  |                                                            .find(assign_opr_to_string(assignment)); 
  |          } 
  |  
  |          bool inequality_enabled(const details::operator_type& inequality) const 
  |          { 
  |             if (disabled_inequality_set_.empty()) 
  |                return true; 
  |             else 
  |                return disabled_inequality_set_.end() == disabled_inequality_set_ 
  |                                                            .find(inequality_opr_to_string(inequality)); 
  |          } 
  |  
  |          bool function_disabled(const std::string& function_name) const 
  |          { 
  |             if (disabled_func_set_.empty()) 
  |                return false; 
  |             else 
  |                return (disabled_func_set_.end() != disabled_func_set_.find(function_name)); 
  |          } 
  |  
  |          bool control_struct_disabled(const std::string& control_struct) const 
  |          { 
  |             if (disabled_ctrl_set_.empty()) 
  |                return false; 
  |             else 
  |                return (disabled_ctrl_set_.end() != disabled_ctrl_set_.find(control_struct)); 
  |          } 
  |  
  |          bool logic_disabled(const std::string& logic_operation) const 
  |          { 
  |             if (disabled_logic_set_.empty()) 
  |                return false; 
  |             else 
  |                return (disabled_logic_set_.end() != disabled_logic_set_.find(logic_operation)); 
  |          } 
  |  
  |          bool assignment_disabled(const details::operator_type assignment_operation) const 
  |          { 
  |             if (disabled_assignment_set_.empty()) 
  |                return false; 
  |             else 
  |                return disabled_assignment_set_.end() != disabled_assignment_set_ 
  |                                                            .find(assign_opr_to_string(assignment_operation)); 
  |          } 
  |  
  |          bool logic_disabled(const details::operator_type logic_operation) const 
  |          { 
  |             if (disabled_logic_set_.empty()) 
  |                return false; 
  |             else 
  |                return disabled_logic_set_.end() != disabled_logic_set_ 
  |                                                            .find(logic_opr_to_string(logic_operation)); 
  |          } 
  |  
  |          bool arithmetic_disabled(const details::operator_type arithmetic_operation) const 
  |          { 
  |             if (disabled_arithmetic_set_.empty()) 
  |                return false; 
  |             else 
  |                return disabled_arithmetic_set_.end() != disabled_arithmetic_set_ 
  |                                                            .find(arith_opr_to_string(arithmetic_operation)); 
  |          } 
  |  
  |          bool inequality_disabled(const details::operator_type& inequality) const 
  |          { 
  |             if (disabled_inequality_set_.empty()) 
  |                return false; 
  |             else 
  |                return disabled_inequality_set_.end() != disabled_inequality_set_ 
  |                                                            .find(inequality_opr_to_string(inequality)); 
  |          } 
  |  
  |          settings_store& disable_base_function(const settings_base_funcs bf) 
  |          { 
  |             if ( 
  |                  (e_bf_unknown != bf) && 
  |                  (static_cast<std::size_t>(bf) < (details::base_function_list_size + 1)) 
  |                ) 
  |             { 
  |                disabled_func_set_.insert(details::base_function_list[bf - 1]); 
  |             } 
  |  
  |             return (*this); 
  |          } 
  |  
  |          settings_store& disable_control_structure(const settings_control_structs ctrl_struct) 
  |          { 
  |             if ( 
  |                  (e_ctrl_unknown != ctrl_struct) && 
  |                  (static_cast<std::size_t>(ctrl_struct) < (details::cntrl_struct_list_size + 1)) 
  |                ) 
  |             { 
  |                disabled_ctrl_set_.insert(details::cntrl_struct_list[ctrl_struct - 1]); 
  |             } 
  |  
  |             return (*this); 
  |          } 
  |  
  |          settings_store& disable_logic_operation(const settings_logic_opr logic) 
  |          { 
  |             if ( 
  |                  (e_logic_unknown != logic) && 
  |                  (static_cast<std::size_t>(logic) < (details::logic_ops_list_size + 1)) 
  |                ) 
  |             { 
  |                disabled_logic_set_.insert(details::logic_ops_list[logic - 1]); 
  |             } 
  |  
  |             return (*this); 
  |          } 
  |  
  |          settings_store& disable_arithmetic_operation(const settings_arithmetic_opr arithmetic) 
  |          { 
  |             if ( 
  |                  (e_arith_unknown != arithmetic) && 
  |                  (static_cast<std::size_t>(arithmetic) < (details::arithmetic_ops_list_size + 1)) 
  |                ) 
  |             { 
  |                disabled_arithmetic_set_.insert(details::arithmetic_ops_list[arithmetic - 1]); 
  |             } 
  |  
  |             return (*this); 
  |          } 
  |  
  |          settings_store& disable_assignment_operation(const settings_assignment_opr assignment) 
  |          { 
  |             if ( 
  |                  (e_assign_unknown != assignment) && 
  |                  (static_cast<std::size_t>(assignment) < (details::assignment_ops_list_size + 1)) 
  |                ) 
  |             { 
  |                disabled_assignment_set_.insert(details::assignment_ops_list[assignment - 1]); 
  |             } 
  |  
  |             return (*this); 
  |          } 
  |  
  |          settings_store& disable_inequality_operation(const settings_inequality_opr inequality) 
  |          { 
  |             if ( 
  |                  (e_ineq_unknown != inequality) && 
  |                  (static_cast<std::size_t>(inequality) < (details::inequality_ops_list_size + 1)) 
  |                ) 
  |             { 
  |                disabled_inequality_set_.insert(details::inequality_ops_list[inequality - 1]); 
  |             } 
  |  
  |             return (*this); 
  |          } 
  |  
  |          settings_store& enable_base_function(const settings_base_funcs bf) 
  |          { 
  |             if ( 
  |                  (e_bf_unknown != bf) && 
  |                  (static_cast<std::size_t>(bf) < (details::base_function_list_size + 1)) 
  |                ) 
  |             { 
  |                const des_itr_t itr = disabled_func_set_.find(details::base_function_list[bf - 1]); 
  |  
  |                if (disabled_func_set_.end() != itr) 
  |                { 
  |                   disabled_func_set_.erase(itr); 
  |                } 
  |             } 
  |  
  |             return (*this); 
  |          } 
  |  
  |          settings_store& enable_control_structure(const settings_control_structs ctrl_struct) 
  |          { 
  |             if ( 
  |                  (e_ctrl_unknown != ctrl_struct) && 
  |                  (static_cast<std::size_t>(ctrl_struct) < (details::cntrl_struct_list_size + 1)) 
  |                ) 
  |             { 
  |                const des_itr_t itr = disabled_ctrl_set_.find(details::cntrl_struct_list[ctrl_struct - 1]); 
  |  
  |                if (disabled_ctrl_set_.end() != itr) 
  |                { 
  |                   disabled_ctrl_set_.erase(itr); 
  |                } 
  |             } 
  |  
  |             return (*this); 
  |          } 
  |  
  |          settings_store& enable_logic_operation(const settings_logic_opr logic) 
  |          { 
  |             if ( 
  |                  (e_logic_unknown != logic) && 
  |                  (static_cast<std::size_t>(logic) < (details::logic_ops_list_size + 1)) 
  |                ) 
  |             { 
  |                const des_itr_t itr = disabled_logic_set_.find(details::logic_ops_list[logic - 1]); 
  |  
  |                if (disabled_logic_set_.end() != itr) 
  |                { 
  |                   disabled_logic_set_.erase(itr); 
  |                } 
  |             } 
  |  
  |             return (*this); 
  |          } 
  |  
  |          settings_store& enable_arithmetic_operation(const settings_arithmetic_opr arithmetic) 
  |          { 
  |             if ( 
  |                  (e_arith_unknown != arithmetic) && 
  |                  (static_cast<std::size_t>(arithmetic) < (details::arithmetic_ops_list_size + 1)) 
  |                ) 
  |             { 
  |                const des_itr_t itr = disabled_arithmetic_set_.find(details::arithmetic_ops_list[arithmetic - 1]); 
  |  
  |                if (disabled_arithmetic_set_.end() != itr) 
  |                { 
  |                   disabled_arithmetic_set_.erase(itr); 
  |                } 
  |             } 
  |  
  |             return (*this); 
  |          } 
  |  
  |          settings_store& enable_assignment_operation(const settings_assignment_opr assignment) 
  |          { 
  |             if ( 
  |                  (e_assign_unknown != assignment) && 
  |                  (static_cast<std::size_t>(assignment) < (details::assignment_ops_list_size + 1)) 
  |                ) 
  |             { 
  |                const des_itr_t itr = disabled_assignment_set_.find(details::assignment_ops_list[assignment - 1]); 
  |  
  |                if (disabled_assignment_set_.end() != itr) 
  |                { 
  |                   disabled_assignment_set_.erase(itr); 
  |                } 
  |             } 
  |  
  |             return (*this); 
  |          } 
  |  
  |          settings_store& enable_inequality_operation(const settings_inequality_opr inequality) 
  |          { 
  |             if ( 
  |                  (e_ineq_unknown != inequality) && 
  |                  (static_cast<std::size_t>(inequality) < (details::inequality_ops_list_size + 1)) 
  |                ) 
  |             { 
  |                const des_itr_t itr = disabled_inequality_set_.find(details::inequality_ops_list[inequality - 1]); 
  |  
  |                if (disabled_inequality_set_.end() != itr) 
  |                { 
  |                   disabled_inequality_set_.erase(itr); 
  |                } 
  |             } 
  |  
  |             return (*this); 
  |          } 
  |  
  |          void set_max_stack_depth(const std::size_t max_stack_depth) 
  |          { 
  |             max_stack_depth_ = max_stack_depth; 
  |          } 
  |  
  |          void set_max_node_depth(const std::size_t max_node_depth) 
  |          { 
  |             max_node_depth_ = max_node_depth; 
  |          } 
  |  
  |          void set_max_local_vector_size(const std::size_t max_local_vector_size) 
  |          { 
  |             max_local_vector_size_ = max_local_vector_size; 
  |          } 
  |  
  |          std::size_t max_stack_depth() const 
  |          { 
  |             return max_stack_depth_; 
  |          } 
  |  
  |          std::size_t max_node_depth() const 
  |          { 
  |             return max_node_depth_; 
  |          } 
  |  
  |          std::size_t max_local_vector_size() const 
  |          { 
  |             return max_local_vector_size_; 
  |          } 
  |  
  |       private: 
  |  
  |          void load_compile_options(const std::size_t compile_options) 
  |          { 
  |             enable_replacer_           = (compile_options & e_replacer            ) == e_replacer; 
  |             enable_joiner_             = (compile_options & e_joiner              ) == e_joiner; 
  |             enable_numeric_check_      = (compile_options & e_numeric_check       ) == e_numeric_check; 
  |             enable_bracket_check_      = (compile_options & e_bracket_check       ) == e_bracket_check; 
  |             enable_sequence_check_     = (compile_options & e_sequence_check      ) == e_sequence_check; 
  |             enable_commutative_check_  = (compile_options & e_commutative_check   ) == e_commutative_check; 
  |             enable_strength_reduction_ = (compile_options & e_strength_reduction  ) == e_strength_reduction; 
  |             enable_collect_vars_       = (compile_options & e_collect_vars        ) == e_collect_vars; 
  |             enable_collect_funcs_      = (compile_options & e_collect_funcs       ) == e_collect_funcs; 
  |             enable_collect_assings_    = (compile_options & e_collect_assings     ) == e_collect_assings; 
  |             disable_vardef_            = (compile_options & e_disable_vardef      ) == e_disable_vardef; 
  |             disable_rsrvd_sym_usr_     = (compile_options & e_disable_usr_on_rsrvd) == e_disable_usr_on_rsrvd; 
  |             disable_zero_return_       = (compile_options & e_disable_zero_return ) == e_disable_zero_return; 
  |          } 
  |  
  |          std::string assign_opr_to_string(details::operator_type opr) const 
  |          { 
  |             switch (opr) 
  |             { 
  |                case details::e_assign : return ":=" 
  |                case details::e_addass : return "+=" 
  |                case details::e_subass : return "-=" 
  |                case details::e_mulass : return "*=" 
  |                case details::e_divass : return "/=" 
  |                case details::e_modass : return "%=" 
  |                default                : return ""  ; 
  |             } 
  |          } 
  |  
  |          std::string arith_opr_to_string(details::operator_type opr) const 
  |          { 
  |             switch (opr) 
  |             { 
  |                case details::e_add : return "+" 
  |                case details::e_sub : return "-" 
  |                case details::e_mul : return "*" 
  |                case details::e_div : return "/" 
  |                case details::e_mod : return "%" 
  |                case details::e_pow : return "^" 
  |                default             : return "" ; 
  |             } 
  |          } 
  |  
  |          std::string inequality_opr_to_string(details::operator_type opr) const 
  |          { 
  |             switch (opr) 
  |             { 
  |                case details::e_lt    : return "<" ; 
  |                case details::e_lte   : return "<=" 
  |                case details::e_eq    : return "==" 
  |                case details::e_equal : return "=" ; 
  |                case details::e_ne    : return "!=" 
  |                case details::e_nequal: return "<>" 
  |                case details::e_gte   : return ">=" 
  |                case details::e_gt    : return ">" ; 
  |                default               : return ""  ; 
  |             } 
  |          } 
  |  
  |          std::string logic_opr_to_string(details::operator_type opr) const 
  |          { 
  |             switch (opr) 
  |             { 
  |                case details::e_and  : return "and" ; 
  |                case details::e_or   : return "or"  ; 
  |                case details::e_xor  : return "xor" ; 
  |                case details::e_nand : return "nand" 
  |                case details::e_nor  : return "nor" ; 
  |                case details::e_xnor : return "xnor" 
  |                case details::e_notl : return "not" ; 
  |                default              : return ""    ; 
  |             } 
  |          } 
  |  
  |          bool enable_replacer_; 
  |          bool enable_joiner_; 
  |          bool enable_numeric_check_; 
  |          bool enable_bracket_check_; 
  |          bool enable_sequence_check_; 
  |          bool enable_commutative_check_; 
  |          bool enable_strength_reduction_; 
  |          bool enable_collect_vars_; 
  |          bool enable_collect_funcs_; 
  |          bool enable_collect_assings_; 
  |          bool disable_vardef_; 
  |          bool disable_rsrvd_sym_usr_; 
  |          bool disable_zero_return_; 
  |  
  |          disabled_entity_set_t disabled_func_set_ ; 
  |          disabled_entity_set_t disabled_ctrl_set_ ; 
  |          disabled_entity_set_t disabled_logic_set_; 
  |          disabled_entity_set_t disabled_arithmetic_set_; 
  |          disabled_entity_set_t disabled_assignment_set_; 
  |          disabled_entity_set_t disabled_inequality_set_; 
  |  
  |          std::size_t max_stack_depth_; 
  |          std::size_t max_node_depth_; 
  |          std::size_t max_local_vector_size_; 
  |  
  |          friend class parser<T>; 
  |       }; 
  |  
  |       typedef settings_store settings_t; 
  |  
  |       explicit parser(const settings_t& settings = settings_t()) 
  |       : settings_(settings) 
  |       , resolve_unknown_symbol_(false) 
  |       , results_context_(0) 
  |       , unknown_symbol_resolver_(reinterpret_cast<unknown_symbol_resolver*>(0)) 
  |         #ifdef _MSC_VER 
  |         #pragma warning(push) 
  |         #pragma warning (disable:4355) 
  |         #endif 
  |       , sem_(*this) 
  |         #ifdef _MSC_VER 
  |         #pragma warning(pop) 
  |         #endif 
  |       , operator_joiner_2_(2) 
  |       , operator_joiner_3_(3) 
  |       , loop_runtime_check_(0) 
  |       , vector_access_runtime_check_(0) 
  |       , compilation_check_ptr_(0) 
  |       , assert_check_(0) 
  |       { 
  |          init_precompilation(); 
  |  
  |          load_operations_map           (base_ops_map_     ); 
  |          load_unary_operations_map     (unary_op_map_     ); 
  |          load_binary_operations_map    (binary_op_map_    ); 
  |          load_inv_binary_operations_map(inv_binary_op_map_); 
  |          load_sf3_map                  (sf3_map_          ); 
  |          load_sf4_map                  (sf4_map_          ); 
  |  
  |          expression_generator_.init_synthesize_map(); 
  |          expression_generator_.set_parser(*this); 
  |          expression_generator_.set_uom (unary_op_map_     ); 
  |          expression_generator_.set_bom (binary_op_map_    ); 
  |          expression_generator_.set_ibom(inv_binary_op_map_); 
  |          expression_generator_.set_sf3m(sf3_map_          ); 
  |          expression_generator_.set_sf4m(sf4_map_          ); 
  |          expression_generator_.set_strength_reduction_state(settings_.strength_reduction_enabled()); 
  |       } 
  |  
  |      ~parser() 
  |       {} 
  |  
  |       inline void init_precompilation() 
  |       { 
  |          dec_.collect_variables() = 
  |             settings_.collect_variables_enabled(); 
  |  
  |          dec_.collect_functions() = 
  |             settings_.collect_functions_enabled(); 
  |  
  |          dec_.collect_assignments() = 
  |             settings_.collect_assignments_enabled(); 
  |  
  |          if (settings_.replacer_enabled()) 
  |          { 
  |             symbol_replacer_.clear(); 
  |             symbol_replacer_.add_replace("true" , "1", lexer::token::e_number); 
  |             symbol_replacer_.add_replace("false", "0", lexer::token::e_number); 
  |             helper_assembly_.token_modifier_list.clear(); 
  |             helper_assembly_.register_modifier(&symbol_replacer_); 
  |          } 
  |  
  |          if (settings_.commutative_check_enabled()) 
  |          { 
  |             for (std::size_t i = 0; i < details::reserved_words_size; ++i) 
  |             { 
  |                commutative_inserter_.ignore_symbol(details::reserved_words[i]); 
  |             } 
  |  
  |             helper_assembly_.token_inserter_list.clear(); 
  |             helper_assembly_.register_inserter(&commutative_inserter_); 
  |          } 
  |  
  |          if (settings_.joiner_enabled()) 
  |          { 
  |             helper_assembly_.token_joiner_list.clear(); 
  |             helper_assembly_.register_joiner(&operator_joiner_2_); 
  |             helper_assembly_.register_joiner(&operator_joiner_3_); 
  |          } 
  |  
  |          if ( 
  |               settings_.numeric_check_enabled () || 
  |               settings_.bracket_check_enabled () || 
  |               settings_.sequence_check_enabled() 
  |             ) 
  |          { 
  |             helper_assembly_.token_scanner_list.clear(); 
  |  
  |             if (settings_.numeric_check_enabled()) 
  |             { 
  |                helper_assembly_.register_scanner(&numeric_checker_); 
  |             } 
  |  
  |             if (settings_.bracket_check_enabled()) 
  |             { 
  |                helper_assembly_.register_scanner(&bracket_checker_); 
  |             } 
  |  
  |             if (settings_.sequence_check_enabled()) 
  |             { 
  |                helper_assembly_.register_scanner(&sequence_validator_      ); 
  |                helper_assembly_.register_scanner(&sequence_validator_3tkns_); 
  |             } 
  |          } 
  |       } 
  |  
  |       inline bool compile(const std::string& expression_string, expression<T>& expr) 
  |       { 
  |          state_               .reset(); 
  |          error_list_          .clear(); 
  |          brkcnt_list_         .clear(); 
  |          synthesis_error_     .clear(); 
  |          immutable_memory_map_.reset(); 
  |          immutable_symtok_map_.clear(); 
  |          current_state_stack_ .clear(); 
  |          assert_ids_          .clear(); 
  |          sem_                 .cleanup(); 
  |  
  |          return_cleanup(); 
  |  
  |          expression_generator_.set_allocator(node_allocator_); 
  |  
  |          if (expression_string.empty()) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                "ERR001 - Empty expression!", 
  |                exprtk_error_location)); 
  |  
  |             return false; 
  |          } 
  |  
  |          if (!init(expression_string)) 
  |          { 
  |             process_lexer_errors(); 
  |             return false; 
  |          } 
  |  
  |          if (lexer().empty()) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                "ERR002 - Empty expression!", 
  |                exprtk_error_location)); 
  |  
  |             return false; 
  |          } 
  |  
  |          if (halt_compilation_check()) 
  |          { 
  |             exprtk_debug(("halt_compilation_check() - compile checkpoint 0\n")); 
  |             return false; 
  |          } 
  |  
  |          if (!run_assemblies()) 
  |          { 
  |             return false; 
  |          } 
  |  
  |          if (halt_compilation_check()) 
  |          { 
  |             exprtk_debug(("halt_compilation_check() - compile checkpoint 1\n")); 
  |             return false; 
  |          } 
  |  
  |          symtab_store_.symtab_list_ = expr.get_symbol_table_list(); 
  |          dec_.clear(); 
  |  
  |          lexer().begin(); 
  |  
  |          next_token(); 
  |  
  |          expression_node_ptr e = parse_corpus(); 
  |  
  |          if ((0 != e) && (token_t::e_eof == current_token().type)) 
  |          { 
  |             bool* retinvk_ptr = 0; 
  |  
  |             if (state_.return_stmt_present) 
  |             { 
  |                dec_.return_present_ = true; 
  |  
  |                e = expression_generator_ 
  |                      .return_envelope(e, results_context_, retinvk_ptr); 
  |             } 
  |  
  |             expr.set_expression(e); 
  |             expr.set_retinvk(retinvk_ptr); 
  |  
  |             register_local_vars(expr); 
  |             register_return_results(expr); 
  |  
  |             return !(!expr); 
  |          } 
  |          else 
  |          { 
  |             if (error_list_.empty()) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR003 - Invalid expression encountered", 
  |                   exprtk_error_location)); 
  |             } 
  |  
  |             if ((0 != e) && branch_deletable(e)) 
  |             { 
  |                destroy_node(e); 
  |             } 
  |  
  |             dec_.clear    (); 
  |             sem_.cleanup  (); 
  |             return_cleanup(); 
  |  
  |             return false; 
  |          } 
  |       } 
  |  
  |       inline expression_t compile(const std::string& expression_string, symbol_table_t& symtab) 
  |       { 
  |          expression_t expression; 
  |          expression.register_symbol_table(symtab); 
  |          compile(expression_string,expression); 
  |          return expression; 
  |       } 
  |  
  |       void process_lexer_errors() 
  |       { 
  |          for (std::size_t i = 0; i < lexer().size(); ++i) 
  |          { 
  |             if (lexer()[i].is_error()) 
  |             { 
  |                std::string diagnostic = "ERR004 - " 
  |  
  |                switch (lexer()[i].type) 
  |                { 
  |                   case lexer::token::e_error      : diagnostic += "General token error" 
  |                                                     break; 
  |  
  |                   case lexer::token::e_err_symbol : diagnostic += "Symbol error" 
  |                                                     break; 
  |  
  |                   case lexer::token::e_err_number : diagnostic += "Invalid numeric token" 
  |                                                     break; 
  |  
  |                   case lexer::token::e_err_string : diagnostic += "Invalid string token" 
  |                                                     break; 
  |  
  |                   case lexer::token::e_err_sfunc  : diagnostic += "Invalid special function token" 
  |                                                     break; 
  |  
  |                   default                         : diagnostic += "Unknown compiler error" 
  |                } 
  |  
  |                set_error(make_error( 
  |                   parser_error::e_lexer, 
  |                   lexer()[i], 
  |                   diagnostic + ": " + lexer()[i].value, 
  |                   exprtk_error_location)); 
  |             } 
  |          } 
  |       } 
  |  
  |       inline bool run_assemblies() 
  |       { 
  |          if (settings_.commutative_check_enabled()) 
  |          { 
  |             helper_assembly_.run_inserters(lexer()); 
  |          } 
  |  
  |          if (settings_.joiner_enabled()) 
  |          { 
  |             helper_assembly_.run_joiners(lexer()); 
  |          } 
  |  
  |          if (settings_.replacer_enabled()) 
  |          { 
  |             helper_assembly_.run_modifiers(lexer()); 
  |          } 
  |  
  |          if ( 
  |               settings_.numeric_check_enabled () || 
  |               settings_.bracket_check_enabled () || 
  |               settings_.sequence_check_enabled() 
  |             ) 
  |          { 
  |             if (!helper_assembly_.run_scanners(lexer())) 
  |             { 
  |                if (helper_assembly_.error_token_scanner) 
  |                { 
  |                   lexer::helper::bracket_checker*            bracket_checker_ptr     = 0; 
  |                   lexer::helper::numeric_checker<T>*         numeric_checker_ptr     = 0; 
  |                   lexer::helper::sequence_validator*         sequence_validator_ptr  = 0; 
  |                   lexer::helper::sequence_validator_3tokens* sequence_validator3_ptr = 0; 
  |  
  |                   if (0 != (bracket_checker_ptr = dynamic_cast<lexer::helper::bracket_checker*>(helper_assembly_.error_token_scanner))) 
  |                   { 
  |                      set_error(make_error( 
  |                         parser_error::e_token, 
  |                         bracket_checker_ptr->error_token(), 
  |                         "ERR005 - Mismatched brackets: '" + bracket_checker_ptr->error_token().value + "'", 
  |                         exprtk_error_location)); 
  |                   } 
  |                   else if (0 != (numeric_checker_ptr = dynamic_cast<lexer::helper::numeric_checker<T>*>(helper_assembly_.error_token_scanner))) 
  |                   { 
  |                      for (std::size_t i = 0; i < numeric_checker_ptr->error_count(); ++i) 
  |                      { 
  |                         lexer::token error_token = lexer()[numeric_checker_ptr->error_index(i)]; 
  |  
  |                         set_error(make_error( 
  |                            parser_error::e_token, 
  |                            error_token, 
  |                            "ERR006 - Invalid numeric token: '" + error_token.value + "'", 
  |                            exprtk_error_location)); 
  |                      } 
  |  
  |                      if (numeric_checker_ptr->error_count()) 
  |                      { 
  |                         numeric_checker_ptr->clear_errors(); 
  |                      } 
  |                   } 
  |                   else if (0 != (sequence_validator_ptr = dynamic_cast<lexer::helper::sequence_validator*>(helper_assembly_.error_token_scanner))) 
  |                   { 
  |                      for (std::size_t i = 0; i < sequence_validator_ptr->error_count(); ++i) 
  |                      { 
  |                         std::pair<lexer::token,lexer::token> error_token = sequence_validator_ptr->error(i); 
  |  
  |                         set_error(make_error( 
  |                            parser_error::e_token, 
  |                            error_token.first, 
  |                            "ERR007 - Invalid token sequence: '" + 
  |                            error_token.first.value  + "' and '" + 
  |                            error_token.second.value + "'", 
  |                            exprtk_error_location)); 
  |                      } 
  |  
  |                      if (sequence_validator_ptr->error_count()) 
  |                      { 
  |                         sequence_validator_ptr->clear_errors(); 
  |                      } 
  |                   } 
  |                   else if (0 != (sequence_validator3_ptr = dynamic_cast<lexer::helper::sequence_validator_3tokens*>(helper_assembly_.error_token_scanner))) 
  |                   { 
  |                      for (std::size_t i = 0; i < sequence_validator3_ptr->error_count(); ++i) 
  |                      { 
  |                         std::pair<lexer::token,lexer::token> error_token = sequence_validator3_ptr->error(i); 
  |  
  |                         set_error(make_error( 
  |                            parser_error::e_token, 
  |                            error_token.first, 
  |                            "ERR008 - Invalid token sequence: '" + 
  |                            error_token.first.value  + "' and '" + 
  |                            error_token.second.value + "'", 
  |                            exprtk_error_location)); 
  |                      } 
  |  
  |                      if (sequence_validator3_ptr->error_count()) 
  |                      { 
  |                         sequence_validator3_ptr->clear_errors(); 
  |                      } 
  |                   } 
  |                } 
  |  
  |                return false; 
  |             } 
  |          } 
  |  
  |          return true; 
  |       } 
  |  
  |       inline settings_store& settings() 
  |       { 
  |          return settings_; 
  |       } 
  |  
  |       inline parser_error::type get_error(const std::size_t& index) const 
  |       { 
  |          if (index < error_list_.size()) 
  |          { 
  |             return error_list_[index]; 
  |          } 
  |  
  |          throw std::invalid_argument("parser::get_error() - Invalid error index specified"); 
  |       } 
  |  
  |       inline std::string error() const 
  |       { 
  |          if (!error_list_.empty()) 
  |          { 
  |             return error_list_[0].diagnostic; 
  |          } 
  |          else 
  |             return std::string("No Error"); 
  |       } 
  |  
  |       inline std::size_t error_count() const 
  |       { 
  |          return error_list_.size(); 
  |       } 
  |  
  |       inline dependent_entity_collector& dec() 
  |       { 
  |          return dec_; 
  |       } 
  |  
  |       inline bool replace_symbol(const std::string& old_symbol, const std::string& new_symbol) 
  |       { 
  |          if (!settings_.replacer_enabled()) 
  |             return false; 
  |          else if (details::is_reserved_word(old_symbol)) 
  |             return false; 
  |          else 
  |             return symbol_replacer_.add_replace(old_symbol,new_symbol,lexer::token::e_symbol); 
  |       } 
  |  
  |       inline bool remove_replace_symbol(const std::string& symbol) 
  |       { 
  |          if (!settings_.replacer_enabled()) 
  |             return false; 
  |          else if (details::is_reserved_word(symbol)) 
  |             return false; 
  |          else 
  |             return symbol_replacer_.remove(symbol); 
  |       } 
  |  
  |       inline void enable_unknown_symbol_resolver(unknown_symbol_resolver* usr = reinterpret_cast<unknown_symbol_resolver*>(0)) 
  |       { 
  |          resolve_unknown_symbol_ = true; 
  |  
  |          if (usr) 
  |             unknown_symbol_resolver_ = usr; 
  |          else 
  |             unknown_symbol_resolver_ = &default_usr_; 
  |       } 
  |  
  |       inline void enable_unknown_symbol_resolver(unknown_symbol_resolver& usr) 
  |       { 
  |          enable_unknown_symbol_resolver(&usr); 
  |       } 
  |  
  |       inline void disable_unknown_symbol_resolver() 
  |       { 
  |          resolve_unknown_symbol_  = false; 
  |          unknown_symbol_resolver_ = &default_usr_; 
  |       } 
  |  
  |       inline void register_loop_runtime_check(loop_runtime_check& lrtchk) 
  |       { 
  |          loop_runtime_check_ = &lrtchk; 
  |       } 
  |  
  |       inline void register_vector_access_runtime_check(vector_access_runtime_check& vartchk) 
  |       { 
  |          vector_access_runtime_check_ = &vartchk; 
  |       } 
  |  
  |       inline void register_compilation_timeout_check(compilation_check& compchk) 
  |       { 
  |          compilation_check_ptr_ = &compchk; 
  |       } 
  |  
  |       inline void register_assert_check(assert_check& assrt_chck) 
  |       { 
  |          assert_check_ = &assrt_chck; 
  |       } 
  |  
  |       inline void clear_loop_runtime_check() 
  |       { 
  |          loop_runtime_check_ = loop_runtime_check_ptr(0); 
  |       } 
  |  
  |       inline void clear_vector_access_runtime_check() 
  |       { 
  |          vector_access_runtime_check_ = vector_access_runtime_check_ptr(0); 
  |       } 
  |  
  |       inline void clear_compilation_timeout_check() 
  |       { 
  |          compilation_check_ptr_ = compilation_check_ptr(0); 
  |       } 
  |  
  |       inline void clear_assert_check() 
  |       { 
  |          assert_check_ = assert_check_ptr(0); 
  |       } 
  |  
  |    private: 
  |  
  |       inline bool valid_base_operation(const std::string& symbol) const 
  |       { 
  |          const std::size_t length = symbol.size(); 
  |  
  |          if ( 
  |               (length < 3) || // Shortest base op symbol length 
  |               (length > 9)    // Longest base op symbol length 
  |             ) 
  |             return false; 
  |          else 
  |             return settings_.function_enabled(symbol) && 
  |                    (base_ops_map_.end() != base_ops_map_.find(symbol)); 
  |       } 
  |  
  |       inline bool valid_vararg_operation(const std::string& symbol) const 
  |       { 
  |          static const std::string s_sum     = "sum" ; 
  |          static const std::string s_mul     = "mul" ; 
  |          static const std::string s_avg     = "avg" ; 
  |          static const std::string s_min     = "min" ; 
  |          static const std::string s_max     = "max" ; 
  |          static const std::string s_mand    = "mand" 
  |          static const std::string s_mor     = "mor" ; 
  |          static const std::string s_multi   = "~"   ; 
  |          static const std::string s_mswitch = "[*]" ; 
  |  
  |          return 
  |                ( 
  |                   details::imatch(symbol,s_sum    ) || 
  |                   details::imatch(symbol,s_mul    ) || 
  |                   details::imatch(symbol,s_avg    ) || 
  |                   details::imatch(symbol,s_min    ) || 
  |                   details::imatch(symbol,s_max    ) || 
  |                   details::imatch(symbol,s_mand   ) || 
  |                   details::imatch(symbol,s_mor    ) || 
  |                   details::imatch(symbol,s_multi  ) || 
  |                   details::imatch(symbol,s_mswitch) 
  |                ) && 
  |                settings_.function_enabled(symbol); 
  |       } 
  |  
  |       bool is_invalid_logic_operation(const details::operator_type operation) const 
  |       { 
  |          return settings_.logic_disabled(operation); 
  |       } 
  |  
  |       bool is_invalid_arithmetic_operation(const details::operator_type operation) const 
  |       { 
  |          return settings_.arithmetic_disabled(operation); 
  |       } 
  |  
  |       bool is_invalid_assignment_operation(const details::operator_type operation) const 
  |       { 
  |          return settings_.assignment_disabled(operation); 
  |       } 
  |  
  |       bool is_invalid_inequality_operation(const details::operator_type operation) const 
  |       { 
  |          return settings_.inequality_disabled(operation); 
  |       } 
  |  
  |       #ifdef exprtk_enable_debugging 
  |       inline void next_token() 
  |       { 
  |          const std::string ct_str = current_token().value; 
  |          const std::size_t ct_pos = current_token().position; 
  |          parser_helper::next_token(); 
  |          const std::string depth(2 * state_.scope_depth,' '); 
  |          exprtk_debug(("%s" 
  |                        "prev[%s | %04d] --> curr[%s | %04d]  stack_level: %3d\n", 
  |                        depth.c_str(), 
  |                        ct_str.c_str(), 
  |                        static_cast<unsigned int>(ct_pos), 
  |                        current_token().value.c_str(), 
  |                        static_cast<unsigned int>(current_token().position), 
  |                        static_cast<unsigned int>(state_.stack_depth))); 
  |       } 
  |       #endif 
  |  
  |       inline expression_node_ptr parse_corpus() 
  |       { 
  |          std::vector<expression_node_ptr> arg_list; 
  |          std::vector<bool> side_effect_list; 
  |  
  |          scoped_vec_delete<expression_node_t> sdd((*this),arg_list); 
  |  
  |          lexer::token begin_token; 
  |          lexer::token end_token; 
  |  
  |          for ( ; ; ) 
  |          { 
  |             state_.side_effect_present = false; 
  |  
  |             begin_token = current_token(); 
  |  
  |             expression_node_ptr arg = parse_expression(); 
  |  
  |             if (0 == arg) 
  |             { 
  |                if (error_list_.empty()) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR009 - Invalid expression encountered", 
  |                      exprtk_error_location)); 
  |                } 
  |  
  |                return error_node(); 
  |             } 
  |             else 
  |             { 
  |                arg_list.push_back(arg); 
  |  
  |                side_effect_list.push_back(state_.side_effect_present); 
  |  
  |                end_token = current_token(); 
  |  
  |                const std::string sub_expr = construct_subexpr(begin_token, end_token); 
  |  
  |                exprtk_debug(("parse_corpus(%02d) Subexpr: %s\n", 
  |                              static_cast<int>(arg_list.size() - 1), 
  |                              sub_expr.c_str())); 
  |  
  |                exprtk_debug(("parse_corpus(%02d) - Side effect present: %s\n", 
  |                              static_cast<int>(arg_list.size() - 1), 
  |                              state_.side_effect_present ? "true" : "false")); 
  |  
  |                exprtk_debug(("-------------------------------------------------\n")); 
  |             } 
  |  
  |             if (token_is(token_t::e_eof,prsrhlpr_t::e_hold)) 
  |             { 
  |                if (lexer().finished()) 
  |                   break; 
  |                else 
  |                   next_token(); 
  |             } 
  |             else if ( 
  |                       !settings_.commutative_check_enabled() && 
  |                       ( 
  |                         current_token().type == token_t::e_symbol || 
  |                         current_token().type == token_t::e_number || 
  |                         current_token().type == token_t::e_string || 
  |                         token_is_bracket(prsrhlpr_t::e_hold) 
  |                       ) 
  |                     ) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR010 - Invalid syntax '" + current_token().value  + "' possible missing operator or context", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |  
  |          if ( 
  |               !arg_list.empty() && 
  |               is_return_node(arg_list.back()) 
  |             ) 
  |          { 
  |             dec_.final_stmt_return_ = true; 
  |          } 
  |  
  |          const expression_node_ptr result = simplify(arg_list,side_effect_list); 
  |  
  |          sdd.delete_ptr = (0 == result); 
  |  
  |          return result; 
  |       } 
  |  
  |       std::string construct_subexpr(lexer::token& begin_token, 
  |                                     lexer::token& end_token, 
  |                                     const bool cleanup_whitespace = true) 
  |       { 
  |          std::string result = lexer().substr(begin_token.position,end_token.position); 
  |          if (cleanup_whitespace) 
  |          { 
  |             for (std::size_t i = 0; i < result.size(); ++i) 
  |             { 
  |                if (details::is_whitespace(result[i])) result[i] = ' '; 
  |             } 
  |          } 
  |  
  |          return result; 
  |       } 
  |  
  |       static const precedence_level default_precedence = e_level00; 
  |  
  |       struct state_t 
  |       { 
  |          inline void set(const precedence_level& l, 
  |                          const precedence_level& r, 
  |                          const details::operator_type& o, 
  |                          const token_t tkn = token_t()) 
  |          { 
  |             left      = l; 
  |             right     = r; 
  |             operation = o; 
  |             token     = tkn; 
  |          } 
  |  
  |          inline void reset() 
  |          { 
  |             left      = e_level00; 
  |             right     = e_level00; 
  |             operation = details::e_default; 
  |          } 
  |  
  |          precedence_level left; 
  |          precedence_level right; 
  |          details::operator_type operation; 
  |          token_t token; 
  |       }; 
  |  
  |       inline void push_current_state(const state_t current_state) 
  |       { 
  |          current_state_stack_.push_back(current_state); 
  |       } 
  |  
  |       inline void pop_current_state() 
  |       { 
  |          if (!current_state_stack_.empty()) 
  |          { 
  |             current_state_stack_.pop_back(); 
  |          } 
  |       } 
  |  
  |       inline state_t current_state() const 
  |       { 
  |          return (!current_state_stack_.empty()) ? 
  |                 current_state_stack_.back()     : 
  |                 state_t(); 
  |       } 
  |  
  |       inline bool halt_compilation_check() 
  |       { 
  |          compilation_check::compilation_context context; 
  |  
  |          if (compilation_check_ptr_ && !compilation_check_ptr_->continue_compilation(context)) 
  |          { 
  |             const std::string error_message = 
  |                !context.error_message.empty() ? " Details: " + context.error_message : "" 
  |  
  |             set_error(make_error( 
  |                parser_error::e_parser, 
  |                token_t(), 
  |                "ERR011 - Internal compilation check failed." + error_message, 
  |                exprtk_error_location)); 
  |  
  |             return true; 
  |          } 
  |  
  |          return false; 
  |       } 
  |  
  |       inline expression_node_ptr parse_expression(precedence_level precedence = e_level00) 
  |       { 
  |          if (halt_compilation_check()) 
  |          { 
  |             exprtk_debug(("halt_compilation_check() - parse_expression checkpoint 2\n")); 
  |             return error_node(); 
  |          } 
  |  
  |          stack_limit_handler slh(*this); 
  |  
  |          if (!slh) 
  |          { 
  |             return error_node(); 
  |          } 
  |  
  |          expression_node_ptr expression = parse_branch(precedence); 
  |  
  |          if (0 == expression) 
  |          { 
  |             return error_node(); 
  |          } 
  |  
  |          if (token_is(token_t::e_eof,prsrhlpr_t::e_hold)) 
  |          { 
  |             return expression; 
  |          } 
  |  
  |          bool break_loop = false; 
  |  
  |          state_t current_state; 
  |  
  |          for ( ; ; ) 
  |          { 
  |             current_state.reset(); 
  |  
  |             switch (current_token().type) 
  |             { 
  |                case token_t::e_assign : current_state.set(e_level00, e_level00, details::e_assign, current_token()); break; 
  |                case token_t::e_addass : current_state.set(e_level00, e_level00, details::e_addass, current_token()); break; 
  |                case token_t::e_subass : current_state.set(e_level00, e_level00, details::e_subass, current_token()); break; 
  |                case token_t::e_mulass : current_state.set(e_level00, e_level00, details::e_mulass, current_token()); break; 
  |                case token_t::e_divass : current_state.set(e_level00, e_level00, details::e_divass, current_token()); break; 
  |                case token_t::e_modass : current_state.set(e_level00, e_level00, details::e_modass, current_token()); break; 
  |                case token_t::e_swap   : current_state.set(e_level00, e_level00, details::e_swap  , current_token()); break; 
  |                case token_t::e_lt     : current_state.set(e_level05, e_level06, details::e_lt    , current_token()); break; 
  |                case token_t::e_lte    : current_state.set(e_level05, e_level06, details::e_lte   , current_token()); break; 
  |                case token_t::e_eq     : current_state.set(e_level05, e_level06, details::e_eq    , current_token()); break; 
  |                case token_t::e_ne     : current_state.set(e_level05, e_level06, details::e_ne    , current_token()); break; 
  |                case token_t::e_gte    : current_state.set(e_level05, e_level06, details::e_gte   , current_token()); break; 
  |                case token_t::e_gt     : current_state.set(e_level05, e_level06, details::e_gt    , current_token()); break; 
  |                case token_t::e_add    : current_state.set(e_level07, e_level08, details::e_add   , current_token()); break; 
  |                case token_t::e_sub    : current_state.set(e_level07, e_level08, details::e_sub   , current_token()); break; 
  |                case token_t::e_div    : current_state.set(e_level10, e_level11, details::e_div   , current_token()); break; 
  |                case token_t::e_mul    : current_state.set(e_level10, e_level11, details::e_mul   , current_token()); break; 
  |                case token_t::e_mod    : current_state.set(e_level10, e_level11, details::e_mod   , current_token()); break; 
  |                case token_t::e_pow    : current_state.set(e_level12, e_level12, details::e_pow   , current_token()); break; 
  |                default                : 
  |                   if (token_t::e_symbol == current_token().type) 
  |                   { 
  |                      static const std::string s_and   = "and"  ; 
  |                      static const std::string s_nand  = "nand" ; 
  |                      static const std::string s_or    = "or"   ; 
  |                      static const std::string s_nor   = "nor"  ; 
  |                      static const std::string s_xor   = "xor"  ; 
  |                      static const std::string s_xnor  = "xnor" ; 
  |                      static const std::string s_in    = "in"   ; 
  |                      static const std::string s_like  = "like" ; 
  |                      static const std::string s_ilike = "ilike" 
  |                      static const std::string s_and1  = "&"    ; 
  |                      static const std::string s_or1   = "|"    ; 
  |                      static const std::string s_not   = "not"  ; 
  |  
  |                      if (details::imatch(current_token().value,s_and)) 
  |                      { 
  |                         current_state.set(e_level03, e_level04, details::e_and, current_token()); 
  |                         break; 
  |                      } 
  |                      else if (details::imatch(current_token().value,s_and1)) 
  |                      { 
  |                         #ifndef exprtk_disable_sc_andor 
  |                         current_state.set(e_level03, e_level04, details::e_scand, current_token()); 
  |                         #else 
  |                         current_state.set(e_level03, e_level04, details::e_and, current_token()); 
  |                         #endif 
  |                         break; 
  |                      } 
  |                      else if (details::imatch(current_token().value,s_nand)) 
  |                      { 
  |                         current_state.set(e_level03, e_level04, details::e_nand, current_token()); 
  |                         break; 
  |                      } 
  |                      else if (details::imatch(current_token().value,s_or)) 
  |                      { 
  |                         current_state.set(e_level01, e_level02, details::e_or, current_token()); 
  |                         break; 
  |                      } 
  |                      else if (details::imatch(current_token().value,s_or1)) 
  |                      { 
  |                         #ifndef exprtk_disable_sc_andor 
  |                         current_state.set(e_level01, e_level02, details::e_scor, current_token()); 
  |                         #else 
  |                         current_state.set(e_level01, e_level02, details::e_or, current_token()); 
  |                         #endif 
  |                         break; 
  |                      } 
  |                      else if (details::imatch(current_token().value,s_nor)) 
  |                      { 
  |                         current_state.set(e_level01, e_level02, details::e_nor, current_token()); 
  |                         break; 
  |                      } 
  |                      else if (details::imatch(current_token().value,s_xor)) 
  |                      { 
  |                         current_state.set(e_level01, e_level02, details::e_xor, current_token()); 
  |                         break; 
  |                      } 
  |                      else if (details::imatch(current_token().value,s_xnor)) 
  |                      { 
  |                         current_state.set(e_level01, e_level02, details::e_xnor, current_token()); 
  |                         break; 
  |                      } 
  |                      else if (details::imatch(current_token().value,s_in)) 
  |                      { 
  |                         current_state.set(e_level04, e_level04, details::e_in, current_token()); 
  |                         break; 
  |                      } 
  |                      else if (details::imatch(current_token().value,s_like)) 
  |                      { 
  |                         current_state.set(e_level04, e_level04, details::e_like, current_token()); 
  |                         break; 
  |                      } 
  |                      else if (details::imatch(current_token().value,s_ilike)) 
  |                      { 
  |                         current_state.set(e_level04, e_level04, details::e_ilike, current_token()); 
  |                         break; 
  |                      } 
  |                      else if (details::imatch(current_token().value,s_not)) 
  |                      { 
  |                         break; 
  |                      } 
  |                   } 
  |  
  |                   break_loop = true; 
  |             } 
  |  
  |             if (break_loop) 
  |             { 
  |                parse_pending_string_rangesize(expression); 
  |                break; 
  |             } 
  |             else if (current_state.left < precedence) 
  |                break; 
  |  
  |             const lexer::token prev_token = current_token(); 
  |  
  |             next_token(); 
  |  
  |             expression_node_ptr right_branch   = error_node(); 
  |             expression_node_ptr new_expression = error_node(); 
  |  
  |             if (is_invalid_logic_operation(current_state.operation)) 
  |             { 
  |                free_node(node_allocator_, expression); 
  |  
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   prev_token, 
  |                   "ERR012 - Invalid or disabled logic operation '" + details::to_str(current_state.operation) + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (is_invalid_arithmetic_operation(current_state.operation)) 
  |             { 
  |                free_node(node_allocator_, expression); 
  |  
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   prev_token, 
  |                   "ERR013 - Invalid or disabled arithmetic operation '" + details::to_str(current_state.operation) + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (is_invalid_inequality_operation(current_state.operation)) 
  |             { 
  |                free_node(node_allocator_, expression); 
  |  
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   prev_token, 
  |                   "ERR014 - Invalid inequality operation '" + details::to_str(current_state.operation) + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (is_invalid_assignment_operation(current_state.operation)) 
  |             { 
  |                free_node(node_allocator_, expression); 
  |  
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   prev_token, 
  |                   "ERR015 - Invalid or disabled assignment operation '" + details::to_str(current_state.operation) + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             if (0 != (right_branch = parse_expression(current_state.right))) 
  |             { 
  |                if ( 
  |                     details::is_return_node(expression  ) || 
  |                     details::is_return_node(right_branch) 
  |                   ) 
  |                { 
  |                   free_node(node_allocator_, expression  ); 
  |                   free_node(node_allocator_, right_branch); 
  |  
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      prev_token, 
  |                      "ERR016 - Return statements cannot be part of sub-expressions", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |  
  |                push_current_state(current_state); 
  |  
  |                new_expression = expression_generator_ 
  |                                   ( 
  |                                     current_state.operation, 
  |                                     expression, 
  |                                     right_branch 
  |                                   ); 
  |  
  |                pop_current_state(); 
  |             } 
  |  
  |             if (0 == new_expression) 
  |             { 
  |                if (error_list_.empty()) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      prev_token, 
  |                      !synthesis_error_.empty() ? 
  |                      synthesis_error_ : 
  |                      "ERR017 - General parsing error at token: '" + prev_token.value + "'", 
  |                      exprtk_error_location)); 
  |                } 
  |  
  |                free_node(node_allocator_, expression  ); 
  |                free_node(node_allocator_, right_branch); 
  |  
  |                return error_node(); 
  |             } 
  |             else 
  |             { 
  |                if ( 
  |                     token_is(token_t::e_ternary,prsrhlpr_t::e_hold) && 
  |                     (e_level00 == precedence) 
  |                   ) 
  |                { 
  |                   expression = parse_ternary_conditional_statement(new_expression); 
  |                } 
  |                else 
  |                   expression = new_expression; 
  |  
  |                parse_pending_string_rangesize(expression); 
  |             } 
  |          } 
  |  
  |          if ((0 != expression) && (expression->node_depth() > settings_.max_node_depth_)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR018 - Expression depth of " + details::to_str(static_cast<int>(expression->node_depth())) + 
  |                " exceeds maximum allowed expression depth of " + details::to_str(static_cast<int>(settings_.max_node_depth_)), 
  |                exprtk_error_location)); 
  |  
  |             free_node(node_allocator_, expression); 
  |  
  |             return error_node(); 
  |          } 
  |          else if ( 
  |                    !settings_.commutative_check_enabled()          && 
  |                    !details::is_logic_opr(current_token().value)   && 
  |                    (current_state.operation == details::e_default) && 
  |                    ( 
  |                      current_token().type == token_t::e_symbol || 
  |                      current_token().type == token_t::e_number || 
  |                      current_token().type == token_t::e_string 
  |                    ) 
  |                  ) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR019 - Invalid syntax '" + current_token().value  + "' possible missing operator or context", 
  |                exprtk_error_location)); 
  |  
  |             free_node(node_allocator_, expression); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          return expression; 
  |       } 
  |  
  |       bool simplify_unary_negation_branch(expression_node_ptr& node) 
  |       { 
  |          { 
  |             typedef details::unary_branch_node<T,details::neg_op<T> > ubn_t; 
  |             ubn_t* n = dynamic_cast<ubn_t*>(node); 
  |  
  |             if (n) 
  |             { 
  |                expression_node_ptr un_r = n->branch(0); 
  |                n->release(); 
  |                free_node(node_allocator_, node); 
  |                node = un_r; 
  |  
  |                return true; 
  |             } 
  |          } 
  |  
  |          { 
  |             typedef details::unary_variable_node<T,details::neg_op<T> > uvn_t; 
  |  
  |             uvn_t* n = dynamic_cast<uvn_t*>(node); 
  |  
  |             if (n) 
  |             { 
  |                const T& v = n->v(); 
  |                expression_node_ptr return_node = error_node(); 
  |  
  |                if ( 
  |                     (0 != (return_node = symtab_store_.get_variable(v))) || 
  |                     (0 != (return_node = sem_         .get_variable(v))) 
  |                   ) 
  |                { 
  |                   free_node(node_allocator_, node); 
  |                   node = return_node; 
  |  
  |                   return true; 
  |                } 
  |                else 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR020 - Failed to find variable node in symbol table", 
  |                      exprtk_error_location)); 
  |  
  |                   free_node(node_allocator_, node); 
  |  
  |                   return false; 
  |                } 
  |             } 
  |          } 
  |  
  |          return false; 
  |       } 
  |  
  |       static inline expression_node_ptr error_node() 
  |       { 
  |          return reinterpret_cast<expression_node_ptr>(0); 
  |       } 
  |  
  |       struct scoped_expression_delete 
  |       { 
  |          scoped_expression_delete(parser<T>& pr, expression_node_ptr& expression) 
  |          : delete_ptr(true) 
  |          , parser_(pr) 
  |          , expression_(expression) 
  |          {} 
  |  
  |         ~scoped_expression_delete() 
  |          { 
  |             if (delete_ptr) 
  |             { 
  |                free_node(parser_.node_allocator_, expression_); 
  |             } 
  |          } 
  |  
  |          bool delete_ptr; 
  |          parser<T>& parser_; 
  |          expression_node_ptr& expression_; 
  |  
  |       private: 
  |  
  |          scoped_expression_delete(const scoped_expression_delete&) exprtk_delete; 
  |          scoped_expression_delete& operator=(const scoped_expression_delete&) exprtk_delete; 
  |       }; 
  |  
  |       template <typename Type, std::size_t N> 
  |       struct scoped_delete 
  |       { 
  |          typedef Type* ptr_t; 
  |  
  |          scoped_delete(parser<T>& pr, ptr_t& p) 
  |          : delete_ptr(true) 
  |          , parser_(pr) 
  |          , p_(&p) 
  |          {} 
  |  
  |          scoped_delete(parser<T>& pr, ptr_t (&p)[N]) 
  |          : delete_ptr(true) 
  |          , parser_(pr) 
  |          , p_(&p[0]) 
  |          {} 
  |  
  |         ~scoped_delete() 
  |          { 
  |             if (delete_ptr) 
  |             { 
  |                for (std::size_t i = 0; i < N; ++i) 
  |                { 
  |                   free_node(parser_.node_allocator_, p_[i]); 
  |                } 
  |             } 
  |          } 
  |  
  |          bool delete_ptr; 
  |          parser<T>& parser_; 
  |          ptr_t* p_; 
  |  
  |       private: 
  |  
  |          scoped_delete(const scoped_delete<Type,N>&) exprtk_delete; 
  |          scoped_delete<Type,N>& operator=(const scoped_delete<Type,N>&) exprtk_delete; 
  |       }; 
  |  
  |       template <typename Type> 
  |       struct scoped_deq_delete 
  |       { 
  |          typedef Type* ptr_t; 
  |  
  |          scoped_deq_delete(parser<T>& pr, std::deque<ptr_t>& deq) 
  |          : delete_ptr(true) 
  |          , parser_(pr) 
  |          , deq_(deq) 
  |          {} 
  |  
  |         ~scoped_deq_delete() 
  |          { 
  |             if (delete_ptr && !deq_.empty()) 
  |             { 
  |                for (std::size_t i = 0; i < deq_.size(); ++i) 
  |                { 
  |                   exprtk_debug(("~scoped_deq_delete() - deleting node: %p\n", reinterpret_cast<void*>(deq_[i]))); 
  |                   free_node(parser_.node_allocator_,deq_[i]); 
  |                } 
  |  
  |                deq_.clear(); 
  |             } 
  |          } 
  |  
  |          bool delete_ptr; 
  |          parser<T>& parser_; 
  |          std::deque<ptr_t>& deq_; 
  |  
  |       private: 
  |  
  |          scoped_deq_delete(const scoped_deq_delete<Type>&) exprtk_delete; 
  |          scoped_deq_delete<Type>& operator=(const scoped_deq_delete<Type>&) exprtk_delete; 
  |       }; 
  |  
  |       template <typename Type> 
  |       struct scoped_vec_delete 
  |       { 
  |          typedef Type* ptr_t; 
  |  
  |          scoped_vec_delete(parser<T>& pr, std::vector<ptr_t>& vec) 
  |          : delete_ptr(true) 
  |          , parser_(pr) 
  |          , vec_(vec) 
  |          {} 
  |  
  |         ~scoped_vec_delete() 
  |          { 
  |             if (delete_ptr && !vec_.empty()) 
  |             { 
  |                for (std::size_t i = 0; i < vec_.size(); ++i) 
  |                { 
  |                   exprtk_debug(("~scoped_vec_delete() - deleting node: %p\n", reinterpret_cast<void*>(vec_[i]))); 
  |                   free_node(parser_.node_allocator_,vec_[i]); 
  |                } 
  |  
  |                vec_.clear(); 
  |             } 
  |          } 
  |  
  |          ptr_t operator[](const std::size_t index) 
  |          { 
  |             return vec_[index]; 
  |          } 
  |  
  |          bool delete_ptr; 
  |          parser<T>& parser_; 
  |          std::vector<ptr_t>& vec_; 
  |  
  |       private: 
  |  
  |          scoped_vec_delete(const scoped_vec_delete<Type>&) exprtk_delete; 
  |          scoped_vec_delete<Type>& operator=(const scoped_vec_delete<Type>&) exprtk_delete; 
  |       }; 
  |  
  |       struct scoped_bool_negator 
  |       { 
  |          explicit scoped_bool_negator(bool& bb) 
  |          : b(bb) 
  |          { b = !b; } 
  |  
  |         ~scoped_bool_negator() 
  |          { b = !b; } 
  |  
  |          bool& b; 
  |       }; 
  |  
  |       struct scoped_bool_or_restorer 
  |       { 
  |          explicit scoped_bool_or_restorer(bool& bb) 
  |          : b(bb) 
  |          , original_value_(bb) 
  |          {} 
  |  
  |         ~scoped_bool_or_restorer() 
  |          { 
  |             b = b || original_value_; 
  |          } 
  |  
  |          bool& b; 
  |          bool original_value_; 
  |       }; 
  |  
  |       struct scoped_inc_dec 
  |       { 
  |          explicit scoped_inc_dec(std::size_t& v) 
  |          : v_(v) 
  |          { ++v_; } 
  |  
  |         ~scoped_inc_dec() 
  |          { 
  |            assert(v_ > 0); 
  |            --v_; 
  |          } 
  |  
  |          std::size_t& v_; 
  |       }; 
  |  
  |       inline expression_node_ptr parse_function_invocation(ifunction<T>* function, const std::string& function_name) 
  |       { 
  |          expression_node_ptr func_node = reinterpret_cast<expression_node_ptr>(0); 
  |  
  |          switch (function->param_count) 
  |          { 
  |             case  0 : func_node = parse_function_call_0  (function,function_name); break; 
  |             case  1 : func_node = parse_function_call< 1>(function,function_name); break; 
  |             case  2 : func_node = parse_function_call< 2>(function,function_name); break; 
  |             case  3 : func_node = parse_function_call< 3>(function,function_name); break; 
  |             case  4 : func_node = parse_function_call< 4>(function,function_name); break; 
  |             case  5 : func_node = parse_function_call< 5>(function,function_name); break; 
  |             case  6 : func_node = parse_function_call< 6>(function,function_name); break; 
  |             case  7 : func_node = parse_function_call< 7>(function,function_name); break; 
  |             case  8 : func_node = parse_function_call< 8>(function,function_name); break; 
  |             case  9 : func_node = parse_function_call< 9>(function,function_name); break; 
  |             case 10 : func_node = parse_function_call<10>(function,function_name); break; 
  |             case 11 : func_node = parse_function_call<11>(function,function_name); break; 
  |             case 12 : func_node = parse_function_call<12>(function,function_name); break; 
  |             case 13 : func_node = parse_function_call<13>(function,function_name); break; 
  |             case 14 : func_node = parse_function_call<14>(function,function_name); break; 
  |             case 15 : func_node = parse_function_call<15>(function,function_name); break; 
  |             case 16 : func_node = parse_function_call<16>(function,function_name); break; 
  |             case 17 : func_node = parse_function_call<17>(function,function_name); break; 
  |             case 18 : func_node = parse_function_call<18>(function,function_name); break; 
  |             case 19 : func_node = parse_function_call<19>(function,function_name); break; 
  |             case 20 : func_node = parse_function_call<20>(function,function_name); break; 
  |             default : { 
  |                          set_error(make_error( 
  |                            parser_error::e_syntax, 
  |                            current_token(), 
  |                            "ERR021 - Invalid number of parameters for function: '" + function_name + "'", 
  |                            exprtk_error_location)); 
  |  
  |                          return error_node(); 
  |                       } 
  |          } 
  |  
  |          if (func_node) 
  |             return func_node; 
  |          else 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR022 - Failed to generate call to function: '" + function_name + "'", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |       } 
  |  
  |       template <std::size_t NumberofParameters> 
  |       inline expression_node_ptr parse_function_call(ifunction<T>* function, const std::string& function_name) 
  |       { 
  |          #ifdef _MSC_VER 
  |             #pragma warning(push) 
  |             #pragma warning(disable: 4127) 
  |          #endif 
  |          if (0 == NumberofParameters) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR023 - Expecting ifunction '" + function_name + "' to have non-zero parameter count", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          #ifdef _MSC_VER 
  |             #pragma warning(pop) 
  |          #endif 
  |  
  |          expression_node_ptr branch[NumberofParameters]; 
  |          expression_node_ptr result  = error_node(); 
  |  
  |          std::fill_n(branch, NumberofParameters, reinterpret_cast<expression_node_ptr>(0)); 
  |  
  |          scoped_delete<expression_node_t,NumberofParameters> sd((*this),branch); 
  |  
  |          next_token(); 
  |  
  |          if (!token_is(token_t::e_lbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR024 - Expecting argument list for function: '" + function_name + "'", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          for (int i = 0; i < static_cast<int>(NumberofParameters); ++i) 
  |          { 
  |             branch[i] = parse_expression(); 
  |  
  |             if (0 == branch[i]) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR025 - Failed to parse argument " + details::to_str(i) + " for function: '" + function_name + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (i < static_cast<int>(NumberofParameters - 1)) 
  |             { 
  |                if (!token_is(token_t::e_comma)) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR026 - Invalid number of arguments for function: '" + function_name + "'", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |             } 
  |          } 
  |  
  |          if (!token_is(token_t::e_rbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR027 - Invalid number of arguments for function: '" + function_name + "'", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else 
  |             result = expression_generator_.function(function,branch); 
  |  
  |          sd.delete_ptr = (0 == result); 
  |  
  |          return result; 
  |       } 
  |  
  |       inline expression_node_ptr parse_function_call_0(ifunction<T>* function, const std::string& function_name) 
  |       { 
  |          expression_node_ptr result = expression_generator_.function(function); 
  |  
  |          state_.side_effect_present = function->has_side_effects(); 
  |  
  |          next_token(); 
  |  
  |          if ( 
  |                token_is(token_t::e_lbracket) && 
  |               !token_is(token_t::e_rbracket) 
  |             ) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR028 - Expecting '()' to proceed call to function: '" + function_name + "'", 
  |                exprtk_error_location)); 
  |  
  |             free_node(node_allocator_, result); 
  |  
  |             return error_node(); 
  |          } 
  |          else 
  |             return result; 
  |       } 
  |  
  |       template <std::size_t MaxNumberofParameters> 
  |       inline std::size_t parse_base_function_call(expression_node_ptr (&param_list)[MaxNumberofParameters], const std::string& function_name = "") 
  |       { 
  |          std::fill_n(param_list, MaxNumberofParameters, reinterpret_cast<expression_node_ptr>(0)); 
  |  
  |          scoped_delete<expression_node_t,MaxNumberofParameters> sd((*this),param_list); 
  |  
  |          next_token(); 
  |  
  |          if (!token_is(token_t::e_lbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR029 - Expected a '(' at start of function call to '" + function_name  + 
  |                "', instead got: '" + current_token().value + "'", 
  |                exprtk_error_location)); 
  |  
  |             return 0; 
  |          } 
  |  
  |          if (token_is(token_t::e_rbracket, e_hold)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR030 - Expected at least one input parameter for function call '" + function_name + "'", 
  |                exprtk_error_location)); 
  |  
  |             return 0; 
  |          } 
  |  
  |          std::size_t param_index = 0; 
  |  
  |          for (; param_index < MaxNumberofParameters; ++param_index) 
  |          { 
  |             param_list[param_index] = parse_expression(); 
  |  
  |             if (0 == param_list[param_index]) 
  |                return 0; 
  |             else if (token_is(token_t::e_rbracket)) 
  |             { 
  |                sd.delete_ptr = false; 
  |                break; 
  |             } 
  |             else if (token_is(token_t::e_comma)) 
  |                continue; 
  |             else 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR031 - Expected a ',' between function input parameters, instead got: '" + current_token().value + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return 0; 
  |             } 
  |          } 
  |  
  |          if (sd.delete_ptr) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR032 - Invalid number of input parameters passed to function '" + function_name  + "'", 
  |                exprtk_error_location)); 
  |  
  |             return 0; 
  |          } 
  |  
  |          return (param_index + 1); 
  |       } 
  |  
  |       inline expression_node_ptr parse_base_operation() 
  |       { 
  |          typedef std::pair<base_ops_map_t::iterator,base_ops_map_t::iterator> map_range_t; 
  |  
  |          const std::string operation_name   = current_token().value; 
  |          const token_t     diagnostic_token = current_token(); 
  |  
  |          map_range_t itr_range = base_ops_map_.equal_range(operation_name); 
  |  
  |          if (0 == std::distance(itr_range.first,itr_range.second)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                diagnostic_token, 
  |                "ERR033 - No entry found for base operation: " + operation_name, 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          static const std::size_t MaxNumberofParameters = 4; 
  |          expression_node_ptr param_list[MaxNumberofParameters] = {0}; 
  |  
  |          const std::size_t parameter_count = parse_base_function_call(param_list, operation_name); 
  |  
  |          if ((parameter_count > 0) && (parameter_count <= MaxNumberofParameters)) 
  |          { 
  |             for (base_ops_map_t::iterator itr = itr_range.first; itr != itr_range.second; ++itr) 
  |             { 
  |                const details::base_operation_t& operation = itr->second; 
  |  
  |                if (operation.num_params == parameter_count) 
  |                { 
  |                   switch (parameter_count) 
  |                   { 
  |                      #define base_opr_case(N)                                         \ 
  |                      case N : {                                                       \ 
  |                                  expression_node_ptr pl##N[N] = {0};                  \ 
  |                                  std::copy(param_list, param_list + N, pl##N);        \ 
  |                                  lodge_symbol(operation_name, e_st_function);         \ 
  |                                  return expression_generator_(operation.type, pl##N); \ 
  |                               }                                                       \ 
  |  
  |                      base_opr_case(1) 
  |                      base_opr_case(2) 
  |                      base_opr_case(3) 
  |                      base_opr_case(4) 
  |                      #undef base_opr_case 
  |                   } 
  |                } 
  |             } 
  |          } 
  |  
  |          for (std::size_t i = 0; i < MaxNumberofParameters; ++i) 
  |          { 
  |             free_node(node_allocator_, param_list[i]); 
  |          } 
  |  
  |          set_error(make_error( 
  |             parser_error::e_syntax, 
  |             diagnostic_token, 
  |             "ERR034 - Invalid number of input parameters for call to function: '" + operation_name + "'", 
  |             exprtk_error_location)); 
  |  
  |          return error_node(); 
  |       } 
  |  
  |       inline expression_node_ptr parse_conditional_statement_01(expression_node_ptr condition) 
  |       { 
  |          // Parse: [if][(][condition][,][consequent][,][alternative][)] 
  |  
  |          expression_node_ptr consequent  = error_node(); 
  |          expression_node_ptr alternative = error_node(); 
  |  
  |          bool result = true; 
  |  
  |          if (!token_is(token_t::e_comma)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR035 - Expected ',' between if-statement condition and consequent", 
  |                exprtk_error_location)); 
  |  
  |             result = false; 
  |          } 
  |          else if (0 == (consequent = parse_expression())) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR036 - Failed to parse consequent for if-statement", 
  |                exprtk_error_location)); 
  |  
  |             result = false; 
  |          } 
  |          else if (!token_is(token_t::e_comma)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR037 - Expected ',' between if-statement consequent and alternative", 
  |                exprtk_error_location)); 
  |  
  |             result = false; 
  |          } 
  |          else if (0 == (alternative = parse_expression())) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR038 - Failed to parse alternative for if-statement", 
  |                exprtk_error_location)); 
  |  
  |             result = false; 
  |          } 
  |          else if (!token_is(token_t::e_rbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR039 - Expected ')' at the end of if-statement", 
  |                exprtk_error_location)); 
  |  
  |             result = false; 
  |          } 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          if (result) 
  |          { 
  |             const bool consq_is_str = is_generally_string_node(consequent ); 
  |             const bool alter_is_str = is_generally_string_node(alternative); 
  |  
  |             if (consq_is_str || alter_is_str) 
  |             { 
  |                if (consq_is_str && alter_is_str) 
  |                { 
  |                   expression_node_ptr result_node = 
  |                      expression_generator_ 
  |                         .conditional_string(condition, consequent, alternative); 
  |  
  |                   if (result_node && result_node->valid()) 
  |                   { 
  |                      return result_node; 
  |                   } 
  |  
  |                   set_error(make_error( 
  |                      parser_error::e_synthesis, 
  |                      current_token(), 
  |                      "ERR040 - Failed to synthesize node: conditional_string", 
  |                      exprtk_error_location)); 
  |  
  |                   free_node(node_allocator_, result_node); 
  |                   return error_node(); 
  |                } 
  |  
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR041 - Return types of if-statement differ: string/non-string", 
  |                   exprtk_error_location)); 
  |  
  |                result = false; 
  |             } 
  |          } 
  |          #endif 
  |  
  |          if (result) 
  |          { 
  |             const bool consq_is_vec = is_ivector_node(consequent ); 
  |             const bool alter_is_vec = is_ivector_node(alternative); 
  |  
  |             if (consq_is_vec || alter_is_vec) 
  |             { 
  |                if (consq_is_vec && alter_is_vec) 
  |                { 
  |                   return expression_generator_ 
  |                            .conditional_vector(condition, consequent, alternative); 
  |                } 
  |  
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR042 - Return types of if-statement differ: vector/non-vector", 
  |                   exprtk_error_location)); 
  |  
  |                result = false; 
  |             } 
  |          } 
  |  
  |          if (!result) 
  |          { 
  |             free_node(node_allocator_, condition  ); 
  |             free_node(node_allocator_, consequent ); 
  |             free_node(node_allocator_, alternative); 
  |  
  |             return error_node(); 
  |          } 
  |          else 
  |             return expression_generator_ 
  |                       .conditional(condition, consequent, alternative); 
  |       } 
  |  
  |       inline expression_node_ptr parse_conditional_statement_02(expression_node_ptr condition) 
  |       { 
  |          expression_node_ptr consequent  = error_node(); 
  |          expression_node_ptr alternative = error_node(); 
  |  
  |          bool result = true; 
  |  
  |          if (token_is(token_t::e_lcrlbracket,prsrhlpr_t::e_hold)) 
  |          { 
  |             if (0 == (consequent = parse_multi_sequence("if-statement-01"))) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR043 - Failed to parse body of consequent for if-statement", 
  |                   exprtk_error_location)); 
  |  
  |                result = false; 
  |             } 
  |             else if 
  |             ( 
  |               !settings_.commutative_check_enabled()           && 
  |               !token_is("else",prsrhlpr_t::e_hold)             && 
  |               !token_is_loop(prsrhlpr_t::e_hold)               && 
  |               !token_is_arithmetic_opr(prsrhlpr_t::e_hold)     && 
  |               !token_is_right_bracket (prsrhlpr_t::e_hold)     && 
  |               !token_is_ineq_opr      (prsrhlpr_t::e_hold)     && 
  |               !token_is(token_t::e_ternary,prsrhlpr_t::e_hold) && 
  |               !token_is(token_t::e_eof    ,prsrhlpr_t::e_hold) 
  |             ) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR044 - Expected ';' at the end of the consequent for if-statement (1)", 
  |                   exprtk_error_location)); 
  |  
  |                result = false; 
  |             } 
  |          } 
  |          else 
  |          { 
  |             if ( 
  |                  settings_.commutative_check_enabled() && 
  |                  token_is(token_t::e_mul,prsrhlpr_t::e_hold) 
  |                ) 
  |             { 
  |                next_token(); 
  |             } 
  |  
  |             if (0 != (consequent = parse_expression())) 
  |             { 
  |                if (!token_is(token_t::e_eof, prsrhlpr_t::e_hold)) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR045 - Expected ';' at the end of the consequent for if-statement (2)", 
  |                      exprtk_error_location)); 
  |  
  |                   result = false; 
  |                } 
  |             } 
  |             else 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR046 - Failed to parse body of consequent for if-statement", 
  |                   exprtk_error_location)); 
  |  
  |                result = false; 
  |             } 
  |          } 
  |  
  |          if (result) 
  |          { 
  |             if ( 
  |                  details::imatch(current_token().value,"else") || 
  |                  (token_is(token_t::e_eof, prsrhlpr_t::e_hold) && peek_token_is("else")) 
  |                ) 
  |             { 
  |                next_token(); 
  |  
  |                if (details::imatch(current_token().value,"else")) 
  |                { 
  |                   next_token(); 
  |                } 
  |  
  |                if (token_is(token_t::e_lcrlbracket,prsrhlpr_t::e_hold)) 
  |                { 
  |                   if (0 == (alternative = parse_multi_sequence("else-statement-01"))) 
  |                   { 
  |                      set_error(make_error( 
  |                         parser_error::e_syntax, 
  |                         current_token(), 
  |                         "ERR047 - Failed to parse body of the 'else' for if-statement", 
  |                         exprtk_error_location)); 
  |  
  |                      result = false; 
  |                   } 
  |                } 
  |                else if (details::imatch(current_token().value,"if")) 
  |                { 
  |                   if (0 == (alternative = parse_conditional_statement())) 
  |                   { 
  |                      set_error(make_error( 
  |                         parser_error::e_syntax, 
  |                         current_token(), 
  |                         "ERR048 - Failed to parse body of if-else statement", 
  |                         exprtk_error_location)); 
  |  
  |                      result = false; 
  |                   } 
  |                } 
  |                else if (0 != (alternative = parse_expression())) 
  |                { 
  |                   if ( 
  |                        !token_is(token_t::e_ternary    , prsrhlpr_t::e_hold) && 
  |                        !token_is(token_t::e_rcrlbracket, prsrhlpr_t::e_hold) && 
  |                        !token_is(token_t::e_eof) 
  |                      ) 
  |                   { 
  |                      set_error(make_error( 
  |                         parser_error::e_syntax, 
  |                         current_token(), 
  |                         "ERR049 - Expected ';' at the end of the 'else-if' for the if-statement", 
  |                         exprtk_error_location)); 
  |  
  |                      result = false; 
  |                   } 
  |                } 
  |                else 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR050 - Failed to parse body of the 'else' for if-statement", 
  |                      exprtk_error_location)); 
  |  
  |                   result = false; 
  |                } 
  |             } 
  |          } 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          if (result) 
  |          { 
  |             const bool consq_is_str = is_generally_string_node(consequent ); 
  |             const bool alter_is_str = is_generally_string_node(alternative); 
  |  
  |             if (consq_is_str || alter_is_str) 
  |             { 
  |                if (consq_is_str && alter_is_str) 
  |                { 
  |                   return expression_generator_ 
  |                            .conditional_string(condition, consequent, alternative); 
  |                } 
  |  
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR051 - Return types of if-statement differ: string/non-string", 
  |                   exprtk_error_location)); 
  |  
  |                result = false; 
  |             } 
  |          } 
  |          #endif 
  |  
  |          if (result) 
  |          { 
  |             const bool consq_is_vec = is_ivector_node(consequent ); 
  |             const bool alter_is_vec = is_ivector_node(alternative); 
  |  
  |             if (consq_is_vec || alter_is_vec) 
  |             { 
  |                if (consq_is_vec && alter_is_vec) 
  |                { 
  |                   return expression_generator_ 
  |                            .conditional_vector(condition, consequent, alternative); 
  |                } 
  |  
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR052 - Return types of if-statement differ: vector/non-vector", 
  |                   exprtk_error_location)); 
  |  
  |                result = false; 
  |             } 
  |          } 
  |  
  |          if (!result) 
  |          { 
  |             free_node(node_allocator_, condition  ); 
  |             free_node(node_allocator_, consequent ); 
  |             free_node(node_allocator_, alternative); 
  |  
  |             return error_node(); 
  |          } 
  |          else 
  |             return expression_generator_ 
  |                       .conditional(condition, consequent, alternative); 
  |       } 
  |  
  |       inline expression_node_ptr parse_conditional_statement() 
  |       { 
  |          expression_node_ptr condition = error_node(); 
  |  
  |          next_token(); 
  |  
  |          if (!token_is(token_t::e_lbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR053 - Expected '(' at start of if-statement, instead got: '" + current_token().value + "'", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (0 == (condition = parse_expression())) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR054 - Failed to parse condition for if-statement", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (token_is(token_t::e_comma,prsrhlpr_t::e_hold)) 
  |          { 
  |             // if (x,y,z) 
  |             return parse_conditional_statement_01(condition); 
  |          } 
  |          else if (token_is(token_t::e_rbracket)) 
  |          { 
  |             /* 
  |                00. if (x) y; 
  |                01. if (x) y; else z; 
  |                02. if (x) y; else {z0; ... zn;} 
  |                03. if (x) y; else if (z) w; 
  |                04. if (x) y; else if (z) w; else u; 
  |                05. if (x) y; else if (z) w; else {u0; ... un;} 
  |                06. if (x) y; else if (z) {w0; ... wn;} 
  |                07. if (x) {y0; ... yn;} 
  |                08. if (x) {y0; ... yn;} else z; 
  |                09. if (x) {y0; ... yn;} else {z0; ... zn;}; 
  |                10. if (x) {y0; ... yn;} else if (z) w; 
  |                11. if (x) {y0; ... yn;} else if (z) w; else u; 
  |                12. if (x) {y0; ... nex;} else if (z) w; else {u0 ... un;} 
  |                13. if (x) {y0; ... yn;} else if (z) {w0; ... wn;} 
  |             */ 
  |             return parse_conditional_statement_02(condition); 
  |          } 
  |  
  |          set_error(make_error( 
  |             parser_error::e_syntax, 
  |             current_token(), 
  |             "ERR055 - Invalid if-statement", 
  |             exprtk_error_location)); 
  |  
  |          free_node(node_allocator_, condition); 
  |  
  |          return error_node(); 
  |       } 
  |  
  |       inline expression_node_ptr parse_ternary_conditional_statement(expression_node_ptr condition) 
  |       { 
  |          // Parse: [condition][?][consequent][:][alternative] 
  |          expression_node_ptr consequent  = error_node(); 
  |          expression_node_ptr alternative = error_node(); 
  |  
  |          bool result = true; 
  |  
  |          if (0 == condition) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR056 - Encountered invalid condition branch for ternary if-statement", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (!token_is(token_t::e_ternary)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR057 - Expected '?' after condition of ternary if-statement", 
  |                exprtk_error_location)); 
  |  
  |             result = false; 
  |          } 
  |          else if (0 == (consequent = parse_expression())) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR058 - Failed to parse consequent for ternary if-statement", 
  |                exprtk_error_location)); 
  |  
  |             result = false; 
  |          } 
  |          else if (!token_is(token_t::e_colon)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR059 - Expected ':' between ternary if-statement consequent and alternative", 
  |                exprtk_error_location)); 
  |  
  |             result = false; 
  |          } 
  |          else if (0 == (alternative = parse_expression())) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR060 - Failed to parse alternative for ternary if-statement", 
  |                exprtk_error_location)); 
  |  
  |             result = false; 
  |          } 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          if (result) 
  |          { 
  |             const bool consq_is_str = is_generally_string_node(consequent ); 
  |             const bool alter_is_str = is_generally_string_node(alternative); 
  |  
  |             if (consq_is_str || alter_is_str) 
  |             { 
  |                if (consq_is_str && alter_is_str) 
  |                { 
  |                   return expression_generator_ 
  |                            .conditional_string(condition, consequent, alternative); 
  |                } 
  |  
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR061 - Return types of ternary differ: string/non-string", 
  |                   exprtk_error_location)); 
  |  
  |                result = false; 
  |             } 
  |          } 
  |          #endif 
  |  
  |          if (result) 
  |          { 
  |             const bool consq_is_vec = is_ivector_node(consequent ); 
  |             const bool alter_is_vec = is_ivector_node(alternative); 
  |  
  |             if (consq_is_vec || alter_is_vec) 
  |             { 
  |                if (consq_is_vec && alter_is_vec) 
  |                { 
  |                   return expression_generator_ 
  |                            .conditional_vector(condition, consequent, alternative); 
  |                } 
  |  
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR062 - Return types of ternary differ: vector/non-vector", 
  |                   exprtk_error_location)); 
  |  
  |                result = false; 
  |             } 
  |          } 
  |  
  |          if (!result) 
  |          { 
  |             free_node(node_allocator_, condition  ); 
  |             free_node(node_allocator_, consequent ); 
  |             free_node(node_allocator_, alternative); 
  |  
  |             return error_node(); 
  |          } 
  |          else 
  |             return expression_generator_ 
  |                       .conditional(condition, consequent, alternative); 
  |       } 
  |  
  |       inline expression_node_ptr parse_not_statement() 
  |       { 
  |          if (settings_.logic_disabled("not")) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR063 - Invalid or disabled logic operation 'not'", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          return parse_base_operation(); 
  |       } 
  |  
  |       void handle_brkcnt_scope_exit() 
  |       { 
  |          assert(!brkcnt_list_.empty()); 
  |          brkcnt_list_.pop_front(); 
  |       } 
  |  
  |       inline expression_node_ptr parse_while_loop() 
  |       { 
  |          // Parse: [while][(][test expr][)][{][expression][}] 
  |          expression_node_ptr condition   = error_node(); 
  |          expression_node_ptr branch      = error_node(); 
  |          expression_node_ptr result_node = error_node(); 
  |  
  |          bool result = true; 
  |  
  |          next_token(); 
  |  
  |          if (!token_is(token_t::e_lbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR064 - Expected '(' at start of while-loop condition statement", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (0 == (condition = parse_expression())) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR065 - Failed to parse condition for while-loop", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (!token_is(token_t::e_rbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR066 - Expected ')' at end of while-loop condition statement", 
  |                exprtk_error_location)); 
  |  
  |             result = false; 
  |          } 
  |  
  |          brkcnt_list_.push_front(false); 
  |  
  |          if (result) 
  |          { 
  |             scoped_inc_dec sid(state_.parsing_loop_stmt_count); 
  |  
  |             if (0 == (branch = parse_multi_sequence("while-loop", true))) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR067 - Failed to parse body of while-loop")); 
  |                result = false; 
  |             } 
  |             else if (0 == (result_node = expression_generator_.while_loop(condition, 
  |                                                                           branch, 
  |                                                                           brkcnt_list_.front()))) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR068 - Failed to synthesize while-loop", 
  |                   exprtk_error_location)); 
  |  
  |                result = false; 
  |             } 
  |          } 
  |  
  |          handle_brkcnt_scope_exit(); 
  |  
  |          if (!result) 
  |          { 
  |             free_node(node_allocator_, branch     ); 
  |             free_node(node_allocator_, condition  ); 
  |             free_node(node_allocator_, result_node); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          if (result_node && result_node->valid()) 
  |          { 
  |             return result_node; 
  |          } 
  |  
  |          set_error(make_error( 
  |             parser_error::e_synthesis, 
  |             current_token(), 
  |             "ERR069 - Failed to synthesize 'valid' while-loop", 
  |             exprtk_error_location)); 
  |  
  |          free_node(node_allocator_, result_node); 
  |  
  |          return error_node(); 
  |       } 
  |  
  |       inline expression_node_ptr parse_repeat_until_loop() 
  |       { 
  |          // Parse: [repeat][{][expression][}][until][(][test expr][)] 
  |          expression_node_ptr condition = error_node(); 
  |          expression_node_ptr branch    = error_node(); 
  |          next_token(); 
  |  
  |          std::vector<expression_node_ptr> arg_list; 
  |          std::vector<bool> side_effect_list; 
  |  
  |          scoped_vec_delete<expression_node_t> sdd((*this),arg_list); 
  |  
  |          brkcnt_list_.push_front(false); 
  |  
  |          if (details::imatch(current_token().value,"until")) 
  |          { 
  |             next_token(); 
  |             branch = node_allocator_.allocate<details::null_node<T> >(); 
  |          } 
  |          else 
  |          { 
  |             const token_t::token_type separator = token_t::e_eof; 
  |  
  |             scope_handler sh(*this); 
  |  
  |             scoped_bool_or_restorer sbr(state_.side_effect_present); 
  |  
  |             scoped_inc_dec sid(state_.parsing_loop_stmt_count); 
  |  
  |             for ( ; ; ) 
  |             { 
  |                state_.side_effect_present = false; 
  |  
  |                expression_node_ptr arg = parse_expression(); 
  |  
  |                if (0 == arg) 
  |                   return error_node(); 
  |                else 
  |                { 
  |                   arg_list.push_back(arg); 
  |                   side_effect_list.push_back(state_.side_effect_present); 
  |                } 
  |  
  |                if (details::imatch(current_token().value,"until")) 
  |                { 
  |                   next_token(); 
  |                   break; 
  |                } 
  |  
  |                const bool is_next_until = peek_token_is(token_t::e_symbol) && 
  |                                           peek_token_is("until"); 
  |  
  |                if (!token_is(separator) && is_next_until) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR070 - Expected '" + token_t::to_str(separator) + "' in body of repeat until loop", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |  
  |                if (details::imatch(current_token().value,"until")) 
  |                { 
  |                   next_token(); 
  |                   break; 
  |                } 
  |             } 
  |  
  |             branch = simplify(arg_list,side_effect_list); 
  |  
  |             sdd.delete_ptr = (0 == branch); 
  |  
  |             if (sdd.delete_ptr) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR071 - Failed to parse body of repeat until loop", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |  
  |          if (!token_is(token_t::e_lbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR072 - Expected '(' before condition statement of repeat until loop", 
  |                exprtk_error_location)); 
  |  
  |             free_node(node_allocator_, branch); 
  |             return error_node(); 
  |          } 
  |          else if (0 == (condition = parse_expression())) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR073 - Failed to parse condition for repeat until loop", 
  |                exprtk_error_location)); 
  |  
  |             free_node(node_allocator_, branch); 
  |             return error_node(); 
  |          } 
  |          else if (!token_is(token_t::e_rbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR074 - Expected ')' after condition of repeat until loop", 
  |                exprtk_error_location)); 
  |  
  |             free_node(node_allocator_, branch   ); 
  |             free_node(node_allocator_, condition); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          expression_node_ptr result_node = 
  |             expression_generator_ 
  |                .repeat_until_loop( 
  |                   condition, 
  |                   branch, 
  |                   brkcnt_list_.front()); 
  |  
  |          if (0 == result_node) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR075 - Failed to synthesize repeat until loop", 
  |                exprtk_error_location)); 
  |  
  |             free_node(node_allocator_, condition); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          handle_brkcnt_scope_exit(); 
  |  
  |          if (result_node && result_node->valid()) 
  |          { 
  |             return result_node; 
  |          } 
  |  
  |          set_error(make_error( 
  |             parser_error::e_synthesis, 
  |             current_token(), 
  |             "ERR076 - Failed to synthesize 'valid' repeat until loop", 
  |             exprtk_error_location)); 
  |  
  |          free_node(node_allocator_, result_node); 
  |  
  |          return error_node(); 
  |       } 
  |  
  |       inline expression_node_ptr parse_for_loop() 
  |       { 
  |          expression_node_ptr initialiser = error_node(); 
  |          expression_node_ptr condition   = error_node(); 
  |          expression_node_ptr incrementor = error_node(); 
  |          expression_node_ptr loop_body   = error_node(); 
  |  
  |          scope_element* se = 0; 
  |          bool result       = true; 
  |  
  |          next_token(); 
  |  
  |          scope_handler sh(*this); 
  |  
  |          if (!token_is(token_t::e_lbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR077 - Expected '(' at start of for-loop", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          if (!token_is(token_t::e_eof)) 
  |          { 
  |             if ( 
  |                  !token_is(token_t::e_symbol,prsrhlpr_t::e_hold) && 
  |                  details::imatch(current_token().value,"var") 
  |                ) 
  |             { 
  |                next_token(); 
  |  
  |                if (!token_is(token_t::e_symbol,prsrhlpr_t::e_hold)) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR078 - Expected a variable at the start of initialiser section of for-loop", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |                else if (!peek_token_is(token_t::e_assign)) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR079 - Expected variable assignment of initialiser section of for-loop", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |  
  |                const std::string loop_counter_symbol = current_token().value; 
  |  
  |                se = &sem_.get_element(loop_counter_symbol); 
  |  
  |                if ((se->name == loop_counter_symbol) && se->active) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR080 - For-loop variable '" + loop_counter_symbol+ "' is being shadowed by a previous declaration", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |                else if (!symtab_store_.is_variable(loop_counter_symbol)) 
  |                { 
  |                   if ( 
  |                        !se->active && 
  |                        (se->name == loop_counter_symbol) && 
  |                        (se->type == scope_element::e_variable) 
  |                      ) 
  |                   { 
  |                      se->active = true; 
  |                      se->ref_count++; 
  |                   } 
  |                   else 
  |                   { 
  |                      scope_element nse; 
  |                      nse.name      = loop_counter_symbol; 
  |                      nse.active    = true; 
  |                      nse.ref_count = 1; 
  |                      nse.type      = scope_element::e_variable; 
  |                      nse.depth     = state_.scope_depth; 
  |                      nse.data      = new T(T(0)); 
  |                      nse.var_node  = node_allocator_.allocate<variable_node_t>(*reinterpret_cast<T*>(nse.data)); 
  |  
  |                      if (!sem_.add_element(nse)) 
  |                      { 
  |                         set_error(make_error( 
  |                            parser_error::e_syntax, 
  |                            current_token(), 
  |                            "ERR081 - Failed to add new local variable '" + loop_counter_symbol + "' to SEM", 
  |                            exprtk_error_location)); 
  |  
  |                         sem_.free_element(nse); 
  |  
  |                         result = false; 
  |                      } 
  |                      else 
  |                      { 
  |                         exprtk_debug(("parse_for_loop() - INFO - Added new local variable: %s\n", nse.name.c_str())); 
  |  
  |                         state_.activate_side_effect("parse_for_loop()"); 
  |                      } 
  |                   } 
  |                } 
  |             } 
  |  
  |             if (0 == (initialiser = parse_expression())) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR082 - Failed to parse initialiser of for-loop", 
  |                   exprtk_error_location)); 
  |  
  |                result = false; 
  |             } 
  |             else if (!token_is(token_t::e_eof)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR083 - Expected ';' after initialiser of for-loop", 
  |                   exprtk_error_location)); 
  |  
  |                result = false; 
  |             } 
  |          } 
  |  
  |          if (!token_is(token_t::e_eof)) 
  |          { 
  |             if (0 == (condition = parse_expression())) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR084 - Failed to parse condition of for-loop", 
  |                   exprtk_error_location)); 
  |  
  |                result = false; 
  |             } 
  |             else if (!token_is(token_t::e_eof)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR085 - Expected ';' after condition section of for-loop", 
  |                   exprtk_error_location)); 
  |  
  |                result = false; 
  |             } 
  |          } 
  |  
  |          if (!token_is(token_t::e_rbracket)) 
  |          { 
  |             if (0 == (incrementor = parse_expression())) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR086 - Failed to parse incrementor of for-loop", 
  |                   exprtk_error_location)); 
  |  
  |                result = false; 
  |             } 
  |             else if (!token_is(token_t::e_rbracket)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR087 - Expected ')' after incrementor section of for-loop", 
  |                   exprtk_error_location)); 
  |  
  |                result = false; 
  |             } 
  |          } 
  |  
  |          if (result) 
  |          { 
  |             brkcnt_list_.push_front(false); 
  |  
  |             scoped_inc_dec sid(state_.parsing_loop_stmt_count); 
  |  
  |             if (0 == (loop_body = parse_multi_sequence("for-loop", true))) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR088 - Failed to parse body of for-loop", 
  |                   exprtk_error_location)); 
  |  
  |                result = false; 
  |             } 
  |          } 
  |  
  |          if (!result) 
  |          { 
  |             if (se) 
  |             { 
  |                se->ref_count--; 
  |             } 
  |  
  |             free_node(node_allocator_, initialiser); 
  |             free_node(node_allocator_, condition  ); 
  |             free_node(node_allocator_, incrementor); 
  |             free_node(node_allocator_, loop_body  ); 
  |             return error_node(); 
  |          } 
  |  
  |          expression_node_ptr result_node = 
  |             expression_generator_.for_loop(initialiser, 
  |                                            condition, 
  |                                            incrementor, 
  |                                            loop_body, 
  |                                            brkcnt_list_.front()); 
  |          handle_brkcnt_scope_exit(); 
  |  
  |          if (result_node && result_node->valid()) 
  |          { 
  |             return result_node; 
  |          } 
  |  
  |          set_error(make_error( 
  |             parser_error::e_synthesis, 
  |             current_token(), 
  |             "ERR089 - Failed to synthesize 'valid' for-loop", 
  |             exprtk_error_location)); 
  |  
  |          free_node(node_allocator_, result_node); 
  |  
  |          return error_node(); 
  |       } 
  |  
  |       inline expression_node_ptr parse_switch_statement() 
  |       { 
  |          std::vector<expression_node_ptr> arg_list; 
  |          expression_node_ptr result = error_node(); 
  |  
  |          if (!details::imatch(current_token().value,"switch")) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR090 - Expected keyword 'switch'", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          scoped_vec_delete<expression_node_t> svd((*this),arg_list); 
  |  
  |          next_token(); 
  |  
  |          if (!token_is(token_t::e_lcrlbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR091 - Expected '{' for call to switch statement", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          expression_node_ptr default_statement = error_node(); 
  |  
  |          scoped_expression_delete defstmt_delete((*this), default_statement); 
  |  
  |          for ( ; ; ) 
  |          { 
  |             if (details::imatch("case",current_token().value)) 
  |             { 
  |                next_token(); 
  |  
  |                expression_node_ptr condition = parse_expression(); 
  |  
  |                if (0 == condition) 
  |                   return error_node(); 
  |                else if (!token_is(token_t::e_colon)) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR092 - Expected ':' for case of switch statement", 
  |                      exprtk_error_location)); 
  |  
  |                   free_node(node_allocator_, condition); 
  |  
  |                   return error_node(); 
  |                } 
  |  
  |                expression_node_ptr consequent = 
  |                   (token_is(token_t::e_lcrlbracket,prsrhlpr_t::e_hold)) ? 
  |                   parse_multi_sequence("switch-consequent") : 
  |                   parse_expression(); 
  |  
  |                if (0 == consequent) 
  |                { 
  |                   free_node(node_allocator_, condition); 
  |  
  |                   return error_node(); 
  |                } 
  |                else if (!token_is(token_t::e_eof)) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR093 - Expected ';' at end of case for switch statement", 
  |                      exprtk_error_location)); 
  |  
  |                   free_node(node_allocator_, condition ); 
  |                   free_node(node_allocator_, consequent); 
  |  
  |                   return error_node(); 
  |                } 
  |  
  |                // Can we optimise away the case statement? 
  |                if (is_constant_node(condition) && is_false(condition)) 
  |                { 
  |                   free_node(node_allocator_, condition ); 
  |                   free_node(node_allocator_, consequent); 
  |                } 
  |                else 
  |                { 
  |                   arg_list.push_back(condition ); 
  |                   arg_list.push_back(consequent); 
  |                } 
  |  
  |             } 
  |             else if (details::imatch("default",current_token().value)) 
  |             { 
  |                if (0 != default_statement) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR094 - Multiple default cases for switch statement", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |  
  |                next_token(); 
  |  
  |                if (!token_is(token_t::e_colon)) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR095 - Expected ':' for default of switch statement", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |  
  |                default_statement = 
  |                   (token_is(token_t::e_lcrlbracket,prsrhlpr_t::e_hold)) ? 
  |                   parse_multi_sequence("switch-default"): 
  |                   parse_expression(); 
  |  
  |                if (0 == default_statement) 
  |                   return error_node(); 
  |                else if (!token_is(token_t::e_eof)) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR096 - Expected ';' at end of default for switch statement", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |             } 
  |             else if (token_is(token_t::e_rcrlbracket)) 
  |                break; 
  |             else 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR097 - Expected '}' at end of switch statement", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |  
  |          const bool default_statement_present = (0 != default_statement); 
  |  
  |          if (default_statement_present) 
  |          { 
  |             arg_list.push_back(default_statement); 
  |          } 
  |          else 
  |          { 
  |             arg_list.push_back(node_allocator_.allocate_c<literal_node_t>(std::numeric_limits<T>::quiet_NaN())); 
  |          } 
  |  
  |          result = expression_generator_.switch_statement(arg_list, (0 != default_statement)); 
  |  
  |          svd.delete_ptr = (0 == result); 
  |          defstmt_delete.delete_ptr = (0 == result); 
  |  
  |          return result; 
  |       } 
  |  
  |       inline expression_node_ptr parse_multi_switch_statement() 
  |       { 
  |          std::vector<expression_node_ptr> arg_list; 
  |  
  |          if (!details::imatch(current_token().value,"[*]")) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR098 - Expected token '[*]'", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          scoped_vec_delete<expression_node_t> svd((*this),arg_list); 
  |  
  |          next_token(); 
  |  
  |          if (!token_is(token_t::e_lcrlbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR099 - Expected '{' for call to [*] statement", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          for ( ; ; ) 
  |          { 
  |             if (!details::imatch("case",current_token().value)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR100 - Expected a 'case' statement for multi-switch", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             next_token(); 
  |  
  |             expression_node_ptr condition = parse_expression(); 
  |  
  |             if (0 == condition) 
  |                return error_node(); 
  |  
  |             if (!token_is(token_t::e_colon)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR101 - Expected ':' for case of [*] statement", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             expression_node_ptr consequent = 
  |                (token_is(token_t::e_lcrlbracket,prsrhlpr_t::e_hold)) ? 
  |                parse_multi_sequence("multi-switch-consequent") : 
  |                parse_expression(); 
  |  
  |             if (0 == consequent) 
  |                return error_node(); 
  |  
  |             if (!token_is(token_t::e_eof)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR102 - Expected ';' at end of case for [*] statement", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             // Can we optimise away the case statement? 
  |             if (is_constant_node(condition) && is_false(condition)) 
  |             { 
  |                free_node(node_allocator_, condition ); 
  |                free_node(node_allocator_, consequent); 
  |             } 
  |             else 
  |             { 
  |                arg_list.push_back(condition ); 
  |                arg_list.push_back(consequent); 
  |             } 
  |  
  |             if (token_is(token_t::e_rcrlbracket,prsrhlpr_t::e_hold)) 
  |             { 
  |                break; 
  |             } 
  |          } 
  |  
  |          if (!token_is(token_t::e_rcrlbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR103 - Expected '}' at end of [*] statement", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          const expression_node_ptr result = expression_generator_.multi_switch_statement(arg_list); 
  |  
  |          svd.delete_ptr = (0 == result); 
  |  
  |          return result; 
  |       } 
  |  
  |       inline expression_node_ptr parse_vararg_function() 
  |       { 
  |          std::vector<expression_node_ptr> arg_list; 
  |  
  |          details::operator_type opt_type = details::e_default; 
  |          const std::string symbol = current_token().value; 
  |  
  |          if (details::imatch(symbol,"~")) 
  |          { 
  |             next_token(); 
  |             return check_block_statement_closure(parse_multi_sequence()); 
  |          } 
  |          else if (details::imatch(symbol,"[*]")) 
  |          { 
  |             return check_block_statement_closure(parse_multi_switch_statement()); 
  |          } 
  |          else if (details::imatch(symbol, "avg" )) opt_type = details::e_avg ; 
  |          else if (details::imatch(symbol, "mand")) opt_type = details::e_mand; 
  |          else if (details::imatch(symbol, "max" )) opt_type = details::e_max ; 
  |          else if (details::imatch(symbol, "min" )) opt_type = details::e_min ; 
  |          else if (details::imatch(symbol, "mor" )) opt_type = details::e_mor ; 
  |          else if (details::imatch(symbol, "mul" )) opt_type = details::e_prod; 
  |          else if (details::imatch(symbol, "sum" )) opt_type = details::e_sum ; 
  |          else 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR104 - Unsupported built-in vararg function: " + symbol, 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          scoped_vec_delete<expression_node_t> sdd((*this),arg_list); 
  |  
  |          lodge_symbol(symbol, e_st_function); 
  |  
  |          next_token(); 
  |  
  |          if (!token_is(token_t::e_lbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR105 - Expected '(' for call to vararg function: " + symbol, 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          if (token_is(token_t::e_rbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR106 - vararg function: " + symbol + 
  |                " requires at least one input parameter", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          for ( ; ; ) 
  |          { 
  |             expression_node_ptr arg = parse_expression(); 
  |  
  |             if (0 == arg) 
  |                return error_node(); 
  |             else 
  |                arg_list.push_back(arg); 
  |  
  |             if (token_is(token_t::e_rbracket)) 
  |                break; 
  |             else if (!token_is(token_t::e_comma)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR107 - Expected ',' for call to vararg function: " + symbol, 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |  
  |          const expression_node_ptr result = expression_generator_.vararg_function(opt_type,arg_list); 
  |  
  |          sdd.delete_ptr = (0 == result); 
  |          return result; 
  |       } 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       inline expression_node_ptr parse_string_range_statement(expression_node_ptr& expression) 
  |       { 
  |          if (!token_is(token_t::e_lsqrbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR108 - Expected '[' as start of string range definition", 
  |                exprtk_error_location)); 
  |  
  |             free_node(node_allocator_, expression); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (token_is(token_t::e_rsqrbracket)) 
  |          { 
  |             return node_allocator_.allocate<details::string_size_node<T> >(expression); 
  |          } 
  |  
  |          range_t rp; 
  |  
  |          if (!parse_range(rp,true)) 
  |          { 
  |             free_node(node_allocator_, expression); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          expression_node_ptr result = expression_generator_(expression,rp); 
  |  
  |          if (0 == result) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR109 - Failed to generate string range node", 
  |                exprtk_error_location)); 
  |  
  |             free_node(node_allocator_, expression); 
  |             rp.free(); 
  |          } 
  |  
  |          rp.clear(); 
  |  
  |          if (result && result->valid()) 
  |          { 
  |             return result; 
  |          } 
  |  
  |          set_error(make_error( 
  |             parser_error::e_synthesis, 
  |             current_token(), 
  |             "ERR110 - Failed to synthesize node: string_range_node", 
  |             exprtk_error_location)); 
  |  
  |          free_node(node_allocator_, result); 
  |          rp.free(); 
  |          return error_node(); 
  |       } 
  |       #else 
  |       inline expression_node_ptr parse_string_range_statement(expression_node_ptr&) 
  |       { 
  |          return error_node(); 
  |       } 
  |       #endif 
  |  
  |       inline bool parse_pending_string_rangesize(expression_node_ptr& expression) 
  |       { 
  |          // Allow no more than 100 range calls, eg: s[][][]...[][] 
  |          const std::size_t max_rangesize_parses = 100; 
  |  
  |          std::size_t i = 0; 
  |  
  |          while 
  |             ( 
  |               (0 != expression)                     && 
  |               (i++ < max_rangesize_parses)          && 
  |               error_list_.empty()                   && 
  |               is_generally_string_node(expression)  && 
  |               token_is(token_t::e_lsqrbracket,prsrhlpr_t::e_hold) 
  |             ) 
  |          { 
  |             expression = parse_string_range_statement(expression); 
  |          } 
  |  
  |          return (i > 1); 
  |       } 
  |  
  |       inline void parse_pending_vector_index_operator(expression_node_ptr& expression) 
  |       { 
  |          if 
  |             ( 
  |               (0 != expression)           && 
  |               error_list_.empty()         && 
  |               is_ivector_node(expression) 
  |             ) 
  |          { 
  |             if ( 
  |                  settings_.commutative_check_enabled()       && 
  |                  token_is(token_t::e_mul,prsrhlpr_t::e_hold) && 
  |                  peek_token_is(token_t::e_lsqrbracket) 
  |                ) 
  |             { 
  |                token_is(token_t::e_mul); 
  |                token_is(token_t::e_lsqrbracket); 
  |             } 
  |             else if (token_is(token_t::e_lsqrbracket,prsrhlpr_t::e_hold)) 
  |             { 
  |                token_is(token_t::e_lsqrbracket); 
  |             } 
  |             else if ( 
  |                       token_is(token_t::e_rbracket,prsrhlpr_t::e_hold) && 
  |                       peek_token_is(token_t::e_lsqrbracket) 
  |                     ) 
  |             { 
  |                token_is(token_t::e_rbracket   ); 
  |                token_is(token_t::e_lsqrbracket); 
  |             } 
  |             else 
  |                return; 
  |  
  |             details::vector_interface<T>* vi = dynamic_cast<details::vector_interface<T>*>(expression); 
  |  
  |             if (vi) 
  |             { 
  |                details::vector_holder<T>& vec = vi->vec()->vec_holder(); 
  |                const std::string vector_name  = sem_.get_vector_name(vec.data()); 
  |                expression_node_ptr index      = parse_vector_index(vector_name); 
  |  
  |                if (index) 
  |                { 
  |                   expression = synthesize_vector_element(vector_name, &vec, expression, index); 
  |                   return; 
  |                } 
  |             } 
  |  
  |             free_node(node_allocator_, expression); 
  |             expression = error_node(); 
  |          } 
  |       } 
  |  
  |       template <typename Allocator1, 
  |                 typename Allocator2, 
  |                 template <typename, typename> class Sequence> 
  |       inline expression_node_ptr simplify(Sequence<expression_node_ptr,Allocator1>& expression_list, 
  |                                           Sequence<bool,Allocator2>& side_effect_list, 
  |                                           const bool specialise_on_final_type = false) 
  |       { 
  |          if (expression_list.empty()) 
  |             return error_node(); 
  |          else if (1 == expression_list.size()) 
  |             return expression_list[0]; 
  |  
  |          Sequence<expression_node_ptr,Allocator1> tmp_expression_list; 
  |  
  |          exprtk_debug(("simplify() - expression_list.size: %d  side_effect_list.size(): %d\n", 
  |                        static_cast<int>(expression_list .size()), 
  |                        static_cast<int>(side_effect_list.size()))); 
  |  
  |          bool return_node_present = false; 
  |  
  |          for (std::size_t i = 0; i < (expression_list.size() - 1); ++i) 
  |          { 
  |             if (is_variable_node(expression_list[i])) 
  |                continue; 
  |             else if ( 
  |                       is_return_node  (expression_list[i]) || 
  |                       is_break_node   (expression_list[i]) || 
  |                       is_continue_node(expression_list[i]) 
  |                     ) 
  |             { 
  |                tmp_expression_list.push_back(expression_list[i]); 
  |  
  |                // Remove all subexpressions after first short-circuit 
  |                // node has been encountered. 
  |  
  |                for (std::size_t j = i + 1; j < expression_list.size(); ++j) 
  |                { 
  |                   free_node(node_allocator_, expression_list[j]); 
  |                } 
  |  
  |                return_node_present = true; 
  |  
  |                break; 
  |             } 
  |             else if ( 
  |                       is_constant_node(expression_list[i]) || 
  |                       is_null_node    (expression_list[i]) || 
  |                       !side_effect_list[i] 
  |                     ) 
  |             { 
  |                free_node(node_allocator_, expression_list[i]); 
  |                continue; 
  |             } 
  |             else 
  |                tmp_expression_list.push_back(expression_list[i]); 
  |          } 
  |  
  |          if (!return_node_present) 
  |          { 
  |             tmp_expression_list.push_back(expression_list.back()); 
  |          } 
  |  
  |          expression_list.swap(tmp_expression_list); 
  |  
  |          if (tmp_expression_list.size() > expression_list.size()) 
  |          { 
  |             exprtk_debug(("simplify() - Reduced subexpressions from %d to %d\n", 
  |                           static_cast<int>(tmp_expression_list.size()), 
  |                           static_cast<int>(expression_list    .size()))); 
  |          } 
  |  
  |          if ( 
  |               return_node_present     || 
  |               side_effect_list.back() || 
  |               (expression_list.size() > 1) 
  |             ) 
  |             state_.activate_side_effect("simplify()"); 
  |  
  |          if (1 == expression_list.size()) 
  |             return expression_list[0]; 
  |          else if (specialise_on_final_type && is_generally_string_node(expression_list.back())) 
  |             return expression_generator_.vararg_function(details::e_smulti,expression_list); 
  |          else 
  |             return expression_generator_.vararg_function(details::e_multi,expression_list); 
  |       } 
  |  
  |       inline expression_node_ptr parse_multi_sequence(const std::string& source = "", 
  |                                                       const bool enforce_crlbrackets = false) 
  |       { 
  |          token_t::token_type open_bracket  = token_t::e_lcrlbracket; 
  |          token_t::token_type close_bracket = token_t::e_rcrlbracket; 
  |          token_t::token_type separator     = token_t::e_eof; 
  |  
  |          if (!token_is(open_bracket)) 
  |          { 
  |             if (!enforce_crlbrackets && token_is(token_t::e_lbracket)) 
  |             { 
  |                open_bracket  = token_t::e_lbracket; 
  |                close_bracket = token_t::e_rbracket; 
  |                separator     = token_t::e_comma; 
  |             } 
  |             else 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR111 - Expected '" + token_t::to_str(open_bracket) + "' for call to multi-sequence" + 
  |                   ((!source.empty()) ? std::string(" section of " + source): ""), 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |          else if (token_is(close_bracket)) 
  |          { 
  |             return node_allocator_.allocate<details::null_node<T> >(); 
  |          } 
  |  
  |          std::vector<expression_node_ptr> arg_list; 
  |          std::vector<bool> side_effect_list; 
  |  
  |          expression_node_ptr result = error_node(); 
  |  
  |          scoped_vec_delete<expression_node_t> sdd((*this),arg_list); 
  |  
  |          scope_handler sh(*this); 
  |  
  |          scoped_bool_or_restorer sbr(state_.side_effect_present); 
  |  
  |          for ( ; ; ) 
  |          { 
  |             state_.side_effect_present = false; 
  |  
  |             expression_node_ptr arg = parse_expression(); 
  |  
  |             if (0 == arg) 
  |                return error_node(); 
  |             else 
  |             { 
  |                arg_list.push_back(arg); 
  |                side_effect_list.push_back(state_.side_effect_present); 
  |             } 
  |  
  |             if (token_is(close_bracket)) 
  |                break; 
  |  
  |             const bool is_next_close = peek_token_is(close_bracket); 
  |  
  |             if (!token_is(separator) && is_next_close) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR112 - Expected '" + lexer::token::seperator_to_str(separator) + "' for call to multi-sequence section of " + source, 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             if (token_is(close_bracket)) 
  |                break; 
  |          } 
  |  
  |          result = simplify(arg_list, side_effect_list, source.empty()); 
  |  
  |          sdd.delete_ptr = (0 == result); 
  |          return result; 
  |       } 
  |  
  |       inline bool parse_range(range_t& rp, const bool skip_lsqr = false) 
  |       { 
  |          // Examples of valid ranges: 
  |          // 1. [1:5]     -> [1,5) 
  |          // 2. [ :5]     -> [0,5) 
  |          // 3. [1: ]     -> [1,end) 
  |          // 4. [x:y]     -> [x,y) where x <= y 
  |          // 5. [x+1:y/2] -> [x+1,y/2) where x+1 <= y/2 
  |          // 6. [ :y]     -> [0,y) where 0 <= y 
  |          // 7. [x: ]     -> [x,end) where x <= end 
  |  
  |          rp.clear(); 
  |  
  |          if (!skip_lsqr && !token_is(token_t::e_lsqrbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR113 - Expected '[' for start of range", 
  |                exprtk_error_location)); 
  |  
  |             return false; 
  |          } 
  |  
  |          if (token_is(token_t::e_colon)) 
  |          { 
  |             rp.n0_c.first  = true; 
  |             rp.n0_c.second = 0; 
  |             rp.cache.first = 0; 
  |          } 
  |          else 
  |          { 
  |             expression_node_ptr r0 = parse_expression(); 
  |  
  |             if (0 == r0) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR114 - Failed parse begin section of range", 
  |                   exprtk_error_location)); 
  |  
  |                return false; 
  |             } 
  |             else if (is_constant_node(r0)) 
  |             { 
  |                const T r0_value = r0->value(); 
  |  
  |                if (r0_value >= T(0)) 
  |                { 
  |                   rp.n0_c.first  = true; 
  |                   rp.n0_c.second = static_cast<std::size_t>(details::numeric::to_int64(r0_value)); 
  |                   rp.cache.first = rp.n0_c.second; 
  |                } 
  |  
  |                free_node(node_allocator_, r0); 
  |  
  |                if (r0_value < T(0)) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR115 - Range lower bound less than zero! Constraint: r0 >= 0", 
  |                      exprtk_error_location)); 
  |  
  |                   return false; 
  |                } 
  |             } 
  |             else 
  |             { 
  |                rp.n0_e.first  = true; 
  |                rp.n0_e.second = r0; 
  |             } 
  |  
  |             if (!token_is(token_t::e_colon)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR116 - Expected ':' for break  in range", 
  |                   exprtk_error_location)); 
  |  
  |                rp.free(); 
  |  
  |                return false; 
  |             } 
  |          } 
  |  
  |          if (token_is(token_t::e_rsqrbracket)) 
  |          { 
  |             rp.n1_c.first  = true; 
  |             rp.n1_c.second = std::numeric_limits<std::size_t>::max(); 
  |          } 
  |          else 
  |          { 
  |             expression_node_ptr r1 = parse_expression(); 
  |  
  |             if (0 == r1) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR117 - Failed parse end section of range", 
  |                   exprtk_error_location)); 
  |  
  |                rp.free(); 
  |  
  |                return false; 
  |             } 
  |             else if (is_constant_node(r1)) 
  |             { 
  |                const T r1_value = r1->value(); 
  |  
  |                if (r1_value >= T(0)) 
  |                { 
  |                   rp.n1_c.first   = true; 
  |                   rp.n1_c.second  = static_cast<std::size_t>(details::numeric::to_int64(r1_value)); 
  |                   rp.cache.second = rp.n1_c.second; 
  |                } 
  |  
  |                free_node(node_allocator_, r1); 
  |  
  |                if (r1_value < T(0)) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR118 - Range upper bound less than zero! Constraint: r1 >= 0", 
  |                      exprtk_error_location)); 
  |  
  |                   rp.free(); 
  |  
  |                   return false; 
  |                } 
  |             } 
  |             else 
  |             { 
  |                rp.n1_e.first  = true; 
  |                rp.n1_e.second = r1; 
  |             } 
  |  
  |             if (!token_is(token_t::e_rsqrbracket)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR119 - Expected ']' for start of range", 
  |                   exprtk_error_location)); 
  |  
  |                rp.free(); 
  |  
  |                return false; 
  |             } 
  |          } 
  |  
  |          if (rp.const_range()) 
  |          { 
  |             std::size_t r0 = 0; 
  |             std::size_t r1 = 0; 
  |  
  |             bool rp_result = false; 
  |  
  |             try 
  |             { 
  |                rp_result = rp(r0, r1); 
  |             } 
  |             catch (std::runtime_error&) 
  |             {} 
  |  
  |             if (!rp_result || (r0 > r1)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR120 - Invalid range, Constraint: r0 <= r1", 
  |                   exprtk_error_location)); 
  |  
  |                return false; 
  |             } 
  |          } 
  |  
  |          return true; 
  |       } 
  |  
  |       inline void lodge_symbol(const std::string& symbol, 
  |                                const symbol_type st) 
  |       { 
  |          dec_.add_symbol(symbol,st); 
  |       } 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       inline expression_node_ptr parse_string() 
  |       { 
  |          const std::string symbol = current_token().value; 
  |  
  |          typedef details::stringvar_node<T>* strvar_node_t; 
  |  
  |          expression_node_ptr result   = error_node(); 
  |          strvar_node_t const_str_node = static_cast<strvar_node_t>(0); 
  |  
  |          scope_element& se = sem_.get_active_element(symbol); 
  |  
  |          if (scope_element::e_string == se.type) 
  |          { 
  |             se.active = true; 
  |             result    = se.str_node; 
  |             lodge_symbol(symbol, e_st_local_string); 
  |          } 
  |          else 
  |          { 
  |             typedef typename symtab_store::string_context str_ctxt_t; 
  |             str_ctxt_t str_ctx = symtab_store_.get_string_context(symbol); 
  |  
  |             if ((0 == str_ctx.str_var) || !symtab_store_.is_conststr_stringvar(symbol)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR121 - Unknown string symbol", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             assert(str_ctx.str_var != 0); 
  |             assert(str_ctx.symbol_table != 0); 
  |  
  |             result = str_ctx.str_var; 
  |  
  |             if (symtab_store_.is_constant_string(symbol)) 
  |             { 
  |                const_str_node = static_cast<strvar_node_t>(result); 
  |                result = expression_generator_(const_str_node->str()); 
  |             } 
  |             else if (symbol_table_t::e_immutable == str_ctx.symbol_table->mutability()) 
  |             { 
  |                lodge_immutable_symbol( 
  |                   current_token(), 
  |                   make_memory_range(str_ctx.str_var->base(), str_ctx.str_var->size())); 
  |             } 
  |  
  |             lodge_symbol(symbol, e_st_string); 
  |          } 
  |  
  |          if (peek_token_is(token_t::e_lsqrbracket)) 
  |          { 
  |             next_token(); 
  |  
  |             if (peek_token_is(token_t::e_rsqrbracket)) 
  |             { 
  |                next_token(); 
  |                next_token(); 
  |  
  |                if (const_str_node) 
  |                { 
  |                   free_node(node_allocator_, result); 
  |  
  |                   return expression_generator_(T(const_str_node->size())); 
  |                } 
  |                else 
  |                   return node_allocator_.allocate<details::stringvar_size_node<T> > 
  |                             (static_cast<details::stringvar_node<T>*>(result)->ref()); 
  |             } 
  |  
  |             range_t rp; 
  |  
  |             if (!parse_range(rp)) 
  |             { 
  |                free_node(node_allocator_, result); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (const_str_node) 
  |             { 
  |                free_node(node_allocator_, result); 
  |                result = expression_generator_(const_str_node->ref(),rp); 
  |             } 
  |             else 
  |                result = expression_generator_(static_cast<details::stringvar_node<T>*> 
  |                            (result)->ref(), rp); 
  |  
  |             if (result) 
  |                rp.clear(); 
  |          } 
  |          else 
  |             next_token(); 
  |  
  |          return result; 
  |       } 
  |       #else 
  |       inline expression_node_ptr parse_string() 
  |       { 
  |          return error_node(); 
  |       } 
  |       #endif 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       inline expression_node_ptr parse_const_string() 
  |       { 
  |          const std::string   const_str = current_token().value; 
  |          expression_node_ptr result    = expression_generator_(const_str); 
  |  
  |          if (peek_token_is(token_t::e_lsqrbracket)) 
  |          { 
  |             next_token(); 
  |  
  |             if (peek_token_is(token_t::e_rsqrbracket)) 
  |             { 
  |                next_token(); 
  |                next_token(); 
  |  
  |                free_node(node_allocator_, result); 
  |  
  |                return expression_generator_(T(const_str.size())); 
  |             } 
  |  
  |             range_t rp; 
  |  
  |             if (!parse_range(rp)) 
  |             { 
  |                free_node(node_allocator_, result); 
  |                rp.free(); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             free_node(node_allocator_, result); 
  |  
  |             if (rp.n1_c.first && (rp.n1_c.second == std::numeric_limits<std::size_t>::max())) 
  |             { 
  |                rp.n1_c.second  = const_str.size() - 1; 
  |                rp.cache.second = rp.n1_c.second; 
  |             } 
  |  
  |             if ( 
  |                  (rp.n0_c.first && (rp.n0_c.second >= const_str.size())) || 
  |                  (rp.n1_c.first && (rp.n1_c.second >= const_str.size())) 
  |                ) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR122 - Overflow in range for string: '" + const_str + "'[" + 
  |                   (rp.n0_c.first ? details::to_str(static_cast<int>(rp.n0_c.second)) : "?") + ":" + 
  |                   (rp.n1_c.first ? details::to_str(static_cast<int>(rp.n1_c.second)) : "?") + "]", 
  |                   exprtk_error_location)); 
  |  
  |                rp.free(); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             result = expression_generator_(const_str,rp); 
  |  
  |             if (result) 
  |                rp.clear(); 
  |          } 
  |          else 
  |             next_token(); 
  |  
  |          return result; 
  |       } 
  |       #else 
  |       inline expression_node_ptr parse_const_string() 
  |       { 
  |          return error_node(); 
  |       } 
  |       #endif 
  |  
  |       inline expression_node_ptr parse_vector_index(const std::string& vector_name = "") 
  |       { 
  |          expression_node_ptr index_expr = error_node(); 
  |  
  |          if (0 == (index_expr = parse_expression())) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR123 - Failed to parse index for vector: '" + vector_name + "'", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (!token_is(token_t::e_rsqrbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR124 - Expected ']' for index of vector: '" + vector_name + "'", 
  |                exprtk_error_location)); 
  |  
  |             free_node(node_allocator_, index_expr); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          return index_expr; 
  |       } 
  |  
  |       inline expression_node_ptr parse_vector() 
  |       { 
  |          const std::string vector_name = current_token().value; 
  |  
  |          vector_holder_ptr vec = vector_holder_ptr(0); 
  |  
  |          const scope_element& se = sem_.get_active_element(vector_name); 
  |  
  |          if ( 
  |               !details::imatch(se.name, vector_name) || 
  |               (se.depth > state_.scope_depth)   || 
  |               (scope_element::e_vector != se.type) 
  |             ) 
  |          { 
  |             typedef typename symtab_store::vector_context vec_ctxt_t; 
  |             vec_ctxt_t vec_ctx = symtab_store_.get_vector_context(vector_name); 
  |  
  |             if (0 == vec_ctx.vector_holder) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR125 - Symbol '" + vector_name + " not a vector", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             assert(0 != vec_ctx.vector_holder); 
  |             assert(0 != vec_ctx.symbol_table ); 
  |  
  |             vec = vec_ctx.vector_holder; 
  |  
  |             if (symbol_table_t::e_immutable == vec_ctx.symbol_table->mutability()) 
  |             { 
  |                lodge_immutable_symbol( 
  |                   current_token(), 
  |                   make_memory_range(vec->data(), vec->size())); 
  |             } 
  |          } 
  |          else 
  |          { 
  |             vec = se.vec_node; 
  |          } 
  |  
  |          assert(0 != vec); 
  |  
  |          next_token(); 
  |  
  |          if (!token_is(token_t::e_lsqrbracket)) 
  |          { 
  |             return node_allocator_.allocate<vector_node_t>(vec); 
  |          } 
  |          else if (token_is(token_t::e_rsqrbracket)) 
  |          { 
  |             return (vec->rebaseable()) ? 
  |                node_allocator_.allocate<vector_size_node_t>(vec) : 
  |                expression_generator_(T(vec->size())); 
  |          } 
  |  
  |          expression_node_ptr index_expr = parse_vector_index(vector_name); 
  |  
  |          if (index_expr) 
  |          { 
  |             expression_node_ptr vec_node = node_allocator_.allocate<vector_node_t>(vec); 
  |  
  |             return synthesize_vector_element(vector_name, vec, vec_node, index_expr); 
  |          } 
  |  
  |          return error_node(); 
  |       } 
  |  
  |       inline expression_node_ptr synthesize_vector_element(const std::string& vector_name, 
  |                                                            vector_holder_ptr vec, 
  |                                                            expression_node_ptr vec_node, 
  |                                                            expression_node_ptr index_expr) 
  |       { 
  |          // Perform compile-time range check 
  |          if (details::is_constant_node(index_expr)) 
  |          { 
  |             const std::size_t index    = static_cast<std::size_t>(details::numeric::to_int32(index_expr->value())); 
  |             const std::size_t vec_size = vec->size(); 
  |  
  |             if (index >= vec_size) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR126 - Index of " + details::to_str(index) + " out of range for " 
  |                   "vector '" + vector_name + "' of size " + details::to_str(vec_size), 
  |                   exprtk_error_location)); 
  |  
  |                free_node(node_allocator_, vec_node  ); 
  |                free_node(node_allocator_, index_expr); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |  
  |          return expression_generator_.vector_element(vector_name, vec, vec_node, index_expr); 
  |       } 
  |  
  |       inline expression_node_ptr parse_vararg_function_call(ivararg_function<T>* vararg_function, const std::string& vararg_function_name) 
  |       { 
  |          std::vector<expression_node_ptr> arg_list; 
  |  
  |          expression_node_ptr result = error_node(); 
  |  
  |          scoped_vec_delete<expression_node_t> sdd((*this),arg_list); 
  |  
  |          next_token(); 
  |  
  |          if (token_is(token_t::e_lbracket)) 
  |          { 
  |             if (token_is(token_t::e_rbracket)) 
  |             { 
  |                if (!vararg_function->allow_zero_parameters()) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR127 - Zero parameter call to vararg function: " 
  |                      + vararg_function_name + " not allowed", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |             } 
  |             else 
  |             { 
  |                for ( ; ; ) 
  |                { 
  |                   expression_node_ptr arg = parse_expression(); 
  |  
  |                   if (0 == arg) 
  |                      return error_node(); 
  |                   else 
  |                      arg_list.push_back(arg); 
  |  
  |                   if (token_is(token_t::e_rbracket)) 
  |                      break; 
  |                   else if (!token_is(token_t::e_comma)) 
  |                   { 
  |                      set_error(make_error( 
  |                         parser_error::e_syntax, 
  |                         current_token(), 
  |                         "ERR128 - Expected ',' for call to vararg function: " 
  |                         + vararg_function_name, 
  |                         exprtk_error_location)); 
  |  
  |                      return error_node(); 
  |                   } 
  |                } 
  |             } 
  |          } 
  |          else if (!vararg_function->allow_zero_parameters()) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR129 - Zero parameter call to vararg function: " 
  |                + vararg_function_name + " not allowed", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          if (arg_list.size() < vararg_function->min_num_args()) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR130 - Invalid number of parameters to call to vararg function: " 
  |                + vararg_function_name + ", require at least " 
  |                + details::to_str(static_cast<int>(vararg_function->min_num_args())) + " parameters", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (arg_list.size() > vararg_function->max_num_args()) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR131 - Invalid number of parameters to call to vararg function: " 
  |                + vararg_function_name + ", require no more than " 
  |                + details::to_str(static_cast<int>(vararg_function->max_num_args())) + " parameters", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          result = expression_generator_.vararg_function_call(vararg_function,arg_list); 
  |  
  |          sdd.delete_ptr = (0 == result); 
  |  
  |          return result; 
  |       } 
  |  
  |       class type_checker 
  |       { 
  |       public: 
  |  
  |          enum return_type_t 
  |          { 
  |             e_overload = ' ', 
  |             e_numeric  = 'T', 
  |             e_string   = 'S' 
  |          }; 
  |  
  |          struct function_prototype_t 
  |          { 
  |              return_type_t return_type; 
  |              std::string   param_seq; 
  |          }; 
  |  
  |          typedef parser<T> parser_t; 
  |          typedef std::vector<function_prototype_t> function_definition_list_t; 
  |  
  |          type_checker(parser_t& p, 
  |                       const std::string& func_name, 
  |                       const std::string& func_prototypes, 
  |                       const return_type_t default_return_type) 
  |          : invalid_state_(true) 
  |          , parser_(p) 
  |          , function_name_(func_name) 
  |          , default_return_type_(default_return_type) 
  |          { 
  |             parse_function_prototypes(func_prototypes); 
  |          } 
  |  
  |          bool verify(const std::string& param_seq, std::size_t& pseq_index) 
  |          { 
  |             if (function_definition_list_.empty()) 
  |                return true; 
  |  
  |             std::vector<std::pair<std::size_t,char> > error_list; 
  |  
  |             for (std::size_t i = 0; i < function_definition_list_.size(); ++i) 
  |             { 
  |                details::char_t diff_value = 0; 
  |                std::size_t     diff_index = 0; 
  |  
  |                const bool result = details::sequence_match(function_definition_list_[i].param_seq, 
  |                                                            param_seq, 
  |                                                            diff_index, diff_value); 
  |  
  |               if (result) 
  |               { 
  |                  pseq_index = i; 
  |                  return true; 
  |               } 
  |               else 
  |                  error_list.push_back(std::make_pair(diff_index, diff_value)); 
  |             } 
  |  
  |             if (1 == error_list.size()) 
  |             { 
  |                parser_.set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   parser_.current_token(), 
  |                   "ERR132 - Failed parameter type check for function '" + function_name_ + "', " 
  |                   "Expected '" + function_definition_list_[0].param_seq + 
  |                   "' call set: '" + param_seq + "'", 
  |                   exprtk_error_location)); 
  |             } 
  |             else 
  |             { 
  |                // find first with largest diff_index; 
  |                std::size_t max_diff_index = 0; 
  |  
  |                for (std::size_t i = 1; i < error_list.size(); ++i) 
  |                { 
  |                   if (error_list[i].first > error_list[max_diff_index].first) 
  |                   { 
  |                      max_diff_index = i; 
  |                   } 
  |                } 
  |  
  |                parser_.set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   parser_.current_token(), 
  |                   "ERR133 - Failed parameter type check for function '" + function_name_ + "', " 
  |                   "Best match: '" + function_definition_list_[max_diff_index].param_seq + 
  |                   "' call set: '" + param_seq + "'", 
  |                   exprtk_error_location)); 
  |             } 
  |  
  |             return false; 
  |          } 
  |  
  |          std::size_t paramseq_count() const 
  |          { 
  |             return function_definition_list_.size(); 
  |          } 
  |  
  |          std::string paramseq(const std::size_t& index) const 
  |          { 
  |             return function_definition_list_[index].param_seq; 
  |          } 
  |  
  |          return_type_t return_type(const std::size_t& index) const 
  |          { 
  |             return function_definition_list_[index].return_type; 
  |          } 
  |  
  |          bool invalid() const 
  |          { 
  |             return !invalid_state_; 
  |          } 
  |  
  |          bool allow_zero_parameters() const 
  |          { 
  |  
  |             for (std::size_t i = 0; i < function_definition_list_.size(); ++i) 
  |             { 
  |                if (std::string::npos != function_definition_list_[i].param_seq.find("Z")) 
  |                { 
  |                   return true; 
  |                } 
  |             } 
  |  
  |             return false; 
  |          } 
  |  
  |       private: 
  |  
  |          std::vector<std::string> split_param_seq(const std::string& param_seq, const details::char_t delimiter = '|') const 
  |          { 
  |              std::string::const_iterator current_begin = param_seq.begin(); 
  |              std::string::const_iterator iter          = param_seq.begin(); 
  |  
  |              std::vector<std::string> result; 
  |  
  |              while (iter != param_seq.end()) 
  |              { 
  |                  if (*iter == delimiter) 
  |                  { 
  |                      result.push_back(std::string(current_begin, iter)); 
  |                      current_begin = ++iter; 
  |                  } 
  |                  else 
  |                      ++iter; 
  |              } 
  |  
  |              if (current_begin != iter) 
  |              { 
  |                  result.push_back(std::string(current_begin, iter)); 
  |              } 
  |  
  |              return result; 
  |          } 
  |  
  |          inline bool is_valid_token(std::string param_seq, 
  |                                     function_prototype_t& funcproto) const 
  |          { 
  |             // Determine return type 
  |             funcproto.return_type = default_return_type_; 
  |  
  |             if (param_seq.size() > 2) 
  |             { 
  |                if (':' == param_seq[1]) 
  |                { 
  |                   // Note: Only overloaded igeneric functions can have return 
  |                   // type definitions. 
  |                   if (type_checker::e_overload != default_return_type_) 
  |                      return false; 
  |  
  |                   switch (param_seq[0]) 
  |                   { 
  |                      case 'T' : funcproto.return_type = type_checker::e_numeric; 
  |                                 break; 
  |  
  |                      case 'S' : funcproto.return_type = type_checker::e_string; 
  |                                 break; 
  |  
  |                      default  : return false; 
  |                   } 
  |  
  |                   param_seq.erase(0,2); 
  |                } 
  |             } 
  |  
  |             if ( 
  |                  (std::string::npos != param_seq.find("?*")) || 
  |                  (std::string::npos != param_seq.find("**")) 
  |                ) 
  |             { 
  |                return false; 
  |             } 
  |             else if ( 
  |                       (std::string::npos == param_seq.find_first_not_of("STV*?|")) || 
  |                       ("Z" == param_seq) 
  |                     ) 
  |             { 
  |                funcproto.param_seq = param_seq; 
  |                return true; 
  |             } 
  |  
  |             return false; 
  |          } 
  |  
  |          void parse_function_prototypes(const std::string& func_prototypes) 
  |          { 
  |             if (func_prototypes.empty()) 
  |                return; 
  |  
  |             std::vector<std::string> param_seq_list = split_param_seq(func_prototypes); 
  |  
  |             typedef std::map<std::string,std::size_t> param_seq_map_t; 
  |             param_seq_map_t param_seq_map; 
  |  
  |             for (std::size_t i = 0; i < param_seq_list.size(); ++i) 
  |             { 
  |                function_prototype_t func_proto; 
  |  
  |                if (!is_valid_token(param_seq_list[i], func_proto)) 
  |                { 
  |                   invalid_state_ = false; 
  |  
  |                   parser_.set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      parser_.current_token(), 
  |                      "ERR134 - Invalid parameter sequence of '" + param_seq_list[i] + 
  |                      "' for function: " + function_name_, 
  |                      exprtk_error_location)); 
  |                   return; 
  |                } 
  |  
  |                param_seq_map_t::const_iterator seq_itr = param_seq_map.find(param_seq_list[i]); 
  |  
  |                if (param_seq_map.end() != seq_itr) 
  |                { 
  |                   invalid_state_ = false; 
  |  
  |                   parser_.set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      parser_.current_token(), 
  |                      "ERR135 - Function '" + function_name_ + "' has a parameter sequence conflict between " + 
  |                      "pseq_idx[" + details::to_str(seq_itr->second) + "] and" + 
  |                      "pseq_idx[" + details::to_str(i) + "] " + 
  |                      "param seq: " + param_seq_list[i], 
  |                      exprtk_error_location)); 
  |                   return; 
  |                } 
  |  
  |                function_definition_list_.push_back(func_proto); 
  |             } 
  |          } 
  |  
  |          type_checker(const type_checker&) exprtk_delete; 
  |          type_checker& operator=(const type_checker&) exprtk_delete; 
  |  
  |          bool invalid_state_; 
  |          parser_t& parser_; 
  |          std::string function_name_; 
  |          const return_type_t default_return_type_; 
  |          function_definition_list_t function_definition_list_; 
  |       }; 
  |  
  |       inline expression_node_ptr parse_generic_function_call(igeneric_function<T>* function, const std::string& function_name) 
  |       { 
  |          std::vector<expression_node_ptr> arg_list; 
  |  
  |          scoped_vec_delete<expression_node_t> sdd((*this),arg_list); 
  |  
  |          next_token(); 
  |  
  |          std::string param_type_list; 
  |  
  |          type_checker tc( 
  |             (*this), 
  |             function_name, 
  |             function->parameter_sequence, 
  |             type_checker::e_string); 
  |  
  |          if (tc.invalid()) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR136 - Type checker instantiation failure for generic function: " + function_name, 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          if (token_is(token_t::e_lbracket)) 
  |          { 
  |             if (token_is(token_t::e_rbracket)) 
  |             { 
  |                if ( 
  |                     !function->allow_zero_parameters() && 
  |                     !tc       .allow_zero_parameters() 
  |                   ) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR137 - Zero parameter call to generic function: " 
  |                      + function_name + " not allowed", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |             } 
  |             else 
  |             { 
  |                for ( ; ; ) 
  |                { 
  |                   expression_node_ptr arg = parse_expression(); 
  |  
  |                   if (0 == arg) 
  |                      return error_node(); 
  |  
  |                   if (is_ivector_node(arg)) 
  |                      param_type_list += 'V'; 
  |                   else if (is_generally_string_node(arg)) 
  |                      param_type_list += 'S'; 
  |                   else // Everything else is assumed to be a scalar returning expression 
  |                      param_type_list += 'T'; 
  |  
  |                   arg_list.push_back(arg); 
  |  
  |                   if (token_is(token_t::e_rbracket)) 
  |                      break; 
  |                   else if (!token_is(token_t::e_comma)) 
  |                   { 
  |                      set_error(make_error( 
  |                         parser_error::e_syntax, 
  |                         current_token(), 
  |                         "ERR138 - Expected ',' for call to generic function: " + function_name, 
  |                         exprtk_error_location)); 
  |  
  |                      return error_node(); 
  |                   } 
  |                } 
  |             } 
  |          } 
  |          else if ( 
  |                    !function->parameter_sequence.empty() && 
  |                    function->allow_zero_parameters    () && 
  |                    !tc      .allow_zero_parameters    () 
  |                  ) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR139 - Zero parameter call to generic function: " 
  |                + function_name + " not allowed", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          std::size_t param_seq_index = 0; 
  |  
  |          if ( 
  |               state_.type_check_enabled && 
  |               !tc.verify(param_type_list, param_seq_index) 
  |             ) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR140 - Invalid input parameter sequence for call to generic function: " + function_name, 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          expression_node_ptr result = error_node(); 
  |  
  |          result = (tc.paramseq_count() <= 1) ? 
  |                   expression_generator_ 
  |                        .generic_function_call(function, arg_list) : 
  |                   expression_generator_ 
  |                        .generic_function_call(function, arg_list, param_seq_index); 
  |  
  |          sdd.delete_ptr = (0 == result); 
  |  
  |          return result; 
  |       } 
  |  
  |       inline bool parse_igeneric_function_params(std::string& param_type_list, 
  |                                                  std::vector<expression_node_ptr>& arg_list, 
  |                                                  const std::string& function_name, 
  |                                                  igeneric_function<T>* function, 
  |                                                  const type_checker& tc) 
  |       { 
  |          if (token_is(token_t::e_lbracket)) 
  |          { 
  |             if (token_is(token_t::e_rbracket)) 
  |             { 
  |                if ( 
  |                     !function->allow_zero_parameters() && 
  |                     !tc       .allow_zero_parameters() 
  |                   ) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR141 - Zero parameter call to generic function: " 
  |                      + function_name + " not allowed", 
  |                      exprtk_error_location)); 
  |  
  |                   return false; 
  |                } 
  |             } 
  |             else 
  |             { 
  |                for ( ; ; ) 
  |                { 
  |                   expression_node_ptr arg = parse_expression(); 
  |  
  |                   if (0 == arg) 
  |                      return false; 
  |  
  |                   if (is_ivector_node(arg)) 
  |                      param_type_list += 'V'; 
  |                   else if (is_generally_string_node(arg)) 
  |                      param_type_list += 'S'; 
  |                   else // Everything else is a scalar returning expression 
  |                      param_type_list += 'T'; 
  |  
  |                   arg_list.push_back(arg); 
  |  
  |                   if (token_is(token_t::e_rbracket)) 
  |                      break; 
  |                   else if (!token_is(token_t::e_comma)) 
  |                   { 
  |                      set_error(make_error( 
  |                         parser_error::e_syntax, 
  |                         current_token(), 
  |                         "ERR142 - Expected ',' for call to string function: " + function_name, 
  |                         exprtk_error_location)); 
  |  
  |                      return false; 
  |                   } 
  |                } 
  |             } 
  |  
  |             return true; 
  |          } 
  |          else 
  |             return false; 
  |       } 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       inline expression_node_ptr parse_string_function_call(igeneric_function<T>* function, const std::string& function_name) 
  |       { 
  |          // Move pass the function name 
  |          next_token(); 
  |  
  |          std::string param_type_list; 
  |  
  |          type_checker tc((*this), function_name, function->parameter_sequence, type_checker::e_string); 
  |  
  |          if ( 
  |               (!function->parameter_sequence.empty()) && 
  |               (0 == tc.paramseq_count()) 
  |             ) 
  |          { 
  |             return error_node(); 
  |          } 
  |  
  |          std::vector<expression_node_ptr> arg_list; 
  |          scoped_vec_delete<expression_node_t> sdd((*this),arg_list); 
  |  
  |          if (!parse_igeneric_function_params(param_type_list, arg_list, function_name, function, tc)) 
  |          { 
  |             return error_node(); 
  |          } 
  |  
  |          std::size_t param_seq_index = 0; 
  |  
  |          if (!tc.verify(param_type_list, param_seq_index)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR143 - Invalid input parameter sequence for call to string function: " + function_name, 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          expression_node_ptr result = error_node(); 
  |  
  |          result = (tc.paramseq_count() <= 1) ? 
  |                   expression_generator_ 
  |                        .string_function_call(function, arg_list) : 
  |                   expression_generator_ 
  |                        .string_function_call(function, arg_list, param_seq_index); 
  |  
  |          sdd.delete_ptr = (0 == result); 
  |  
  |          return result; 
  |       } 
  |  
  |       inline expression_node_ptr parse_overload_function_call(igeneric_function<T>* function, const std::string& function_name) 
  |       { 
  |          // Move pass the function name 
  |          next_token(); 
  |  
  |          std::string param_type_list; 
  |  
  |          type_checker tc((*this), function_name, function->parameter_sequence, type_checker::e_overload); 
  |  
  |          if ( 
  |               (!function->parameter_sequence.empty()) && 
  |               (0 == tc.paramseq_count()) 
  |             ) 
  |          { 
  |             return error_node(); 
  |          } 
  |  
  |          std::vector<expression_node_ptr> arg_list; 
  |          scoped_vec_delete<expression_node_t> sdd((*this),arg_list); 
  |  
  |          if (!parse_igeneric_function_params(param_type_list, arg_list, function_name, function, tc)) 
  |          { 
  |             return error_node(); 
  |          } 
  |  
  |          std::size_t param_seq_index = 0; 
  |  
  |          if (!tc.verify(param_type_list, param_seq_index)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR144 - Invalid input parameter sequence for call to overloaded function: " + function_name, 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          expression_node_ptr result = error_node(); 
  |  
  |          if (type_checker::e_numeric == tc.return_type(param_seq_index)) 
  |          { 
  |             if (tc.paramseq_count() <= 1) 
  |                result = expression_generator_ 
  |                           .generic_function_call(function, arg_list); 
  |             else 
  |                result = expression_generator_ 
  |                           .generic_function_call(function, arg_list, param_seq_index); 
  |          } 
  |          else if (type_checker::e_string == tc.return_type(param_seq_index)) 
  |          { 
  |             if (tc.paramseq_count() <= 1) 
  |                result = expression_generator_ 
  |                           .string_function_call(function, arg_list); 
  |             else 
  |                result = expression_generator_ 
  |                           .string_function_call(function, arg_list, param_seq_index); 
  |          } 
  |          else 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR145 - Invalid return type for call to overloaded function: " + function_name, 
  |                exprtk_error_location)); 
  |          } 
  |  
  |          sdd.delete_ptr = (0 == result); 
  |          return result; 
  |       } 
  |       #endif 
  |  
  |       template <typename Type, std::size_t NumberOfParameters> 
  |       struct parse_special_function_impl 
  |       { 
  |          static inline expression_node_ptr process(parser<Type>& p, const details::operator_type opt_type, const std::string& sf_name) 
  |          { 
  |             expression_node_ptr branch[NumberOfParameters]; 
  |             expression_node_ptr result = error_node(); 
  |  
  |             std::fill_n(branch, NumberOfParameters, reinterpret_cast<expression_node_ptr>(0)); 
  |  
  |             scoped_delete<expression_node_t,NumberOfParameters> sd(p,branch); 
  |  
  |             p.next_token(); 
  |  
  |             if (!p.token_is(token_t::e_lbracket)) 
  |             { 
  |                p.set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   p.current_token(), 
  |                   "ERR146 - Expected '(' for special function '" + sf_name + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             for (std::size_t i = 0; i < NumberOfParameters; ++i) 
  |             { 
  |                branch[i] = p.parse_expression(); 
  |  
  |                if (0 == branch[i]) 
  |                { 
  |                   return p.error_node(); 
  |                } 
  |                else if (i < (NumberOfParameters - 1)) 
  |                { 
  |                   if (!p.token_is(token_t::e_comma)) 
  |                   { 
  |                      p.set_error(make_error( 
  |                         parser_error::e_syntax, 
  |                         p.current_token(), 
  |                         "ERR147 - Expected ',' before next parameter of special function '" + sf_name + "'", 
  |                         exprtk_error_location)); 
  |  
  |                      return p.error_node(); 
  |                   } 
  |                } 
  |             } 
  |  
  |             if (!p.token_is(token_t::e_rbracket)) 
  |             { 
  |                p.set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   p.current_token(), 
  |                   "ERR148 - Invalid number of parameters for special function '" + sf_name + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return p.error_node(); 
  |             } 
  |             else 
  |                result = p.expression_generator_.special_function(opt_type,branch); 
  |  
  |             sd.delete_ptr = (0 == result); 
  |  
  |             return result; 
  |          } 
  |       }; 
  |  
  |       inline expression_node_ptr parse_special_function() 
  |       { 
  |          const std::string sf_name = current_token().value; 
  |  
  |          // Expect: $fDD(expr0,expr1,expr2) or $fDD(expr0,expr1,expr2,expr3) 
  |          if ( 
  |               !details::is_digit(sf_name[2]) || 
  |               !details::is_digit(sf_name[3]) 
  |             ) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_token, 
  |                current_token(), 
  |                "ERR149 - Invalid special function[1]: " + sf_name, 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          const int id = (sf_name[2] - '0') * 10 + 
  |                         (sf_name[3] - '0'); 
  |  
  |          if (id >= details::e_sffinal) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_token, 
  |                current_token(), 
  |                "ERR150 - Invalid special function[2]: " + sf_name, 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          const int sf_3_to_4                   = details::e_sf48; 
  |          const details::operator_type opt_type = details::operator_type(id + 1000); 
  |          const std::size_t NumberOfParameters  = (id < (sf_3_to_4 - 1000)) ? 3U : 4U; 
  |  
  |          switch (NumberOfParameters) 
  |          { 
  |             case 3  : return parse_special_function_impl<T,3>::process((*this), opt_type, sf_name); 
  |             case 4  : return parse_special_function_impl<T,4>::process((*this), opt_type, sf_name); 
  |             default : return error_node(); 
  |          } 
  |       } 
  |  
  |       inline expression_node_ptr parse_null_statement() 
  |       { 
  |          next_token(); 
  |          return node_allocator_.allocate<details::null_node<T> >(); 
  |       } 
  |  
  |       #ifndef exprtk_disable_break_continue 
  |       inline expression_node_ptr parse_break_statement() 
  |       { 
  |          if (state_.parsing_break_stmt) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR151 - Invoking 'break' within a break call is not allowed", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (0 == state_.parsing_loop_stmt_count) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR152 - Invalid use of 'break', allowed only in the scope of a loop", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          scoped_bool_negator sbn(state_.parsing_break_stmt); 
  |  
  |          if (!brkcnt_list_.empty()) 
  |          { 
  |             next_token(); 
  |  
  |             brkcnt_list_.front() = true; 
  |  
  |             expression_node_ptr return_expr = error_node(); 
  |  
  |             if (token_is(token_t::e_lsqrbracket)) 
  |             { 
  |                if (0 == (return_expr = parse_expression())) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR153 - Failed to parse return expression for 'break' statement", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |                else if (!token_is(token_t::e_rsqrbracket)) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR154 - Expected ']' at the completion of break's return expression", 
  |                      exprtk_error_location)); 
  |  
  |                   free_node(node_allocator_, return_expr); 
  |  
  |                   return error_node(); 
  |                } 
  |             } 
  |  
  |             state_.activate_side_effect("parse_break_statement()"); 
  |  
  |             return node_allocator_.allocate<details::break_node<T> >(return_expr); 
  |          } 
  |          else 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR155 - Invalid use of 'break', allowed only in the scope of a loop", 
  |                exprtk_error_location)); 
  |          } 
  |  
  |          return error_node(); 
  |       } 
  |  
  |       inline expression_node_ptr parse_continue_statement() 
  |       { 
  |          if (0 == state_.parsing_loop_stmt_count) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR156 - Invalid use of 'continue', allowed only in the scope of a loop", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else 
  |          { 
  |             next_token(); 
  |  
  |             brkcnt_list_.front() = true; 
  |             state_.activate_side_effect("parse_continue_statement()"); 
  |  
  |             return node_allocator_.allocate<details::continue_node<T> >(); 
  |          } 
  |       } 
  |       #endif 
  |  
  |       inline expression_node_ptr parse_define_vector_statement(const std::string& vec_name) 
  |       { 
  |          expression_node_ptr size_expression_node = error_node(); 
  |  
  |          if (!token_is(token_t::e_lsqrbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR157 - Expected '[' as part of vector size definition", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (0 == (size_expression_node = parse_expression())) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR158 - Failed to determine size of vector '" + vec_name + "'", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (!is_constant_node(size_expression_node)) 
  |          { 
  |             const bool is_rebaseble_vector = 
  |                (size_expression_node->type() == details::expression_node<T>::e_vecsize) && 
  |                static_cast<details::vector_size_node<T>*>(size_expression_node)->vec_holder()->rebaseable(); 
  |  
  |             free_node(node_allocator_, size_expression_node); 
  |  
  |             const std::string error_msg = (is_rebaseble_vector) ? 
  |                                           std::string("Rebasable/Resizable vector cannot be used to define the size of vector") : 
  |                                           std::string("Expected a constant literal number as size of vector"); 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR159 - " + error_msg + " '" + vec_name + "'", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          const T vector_size = size_expression_node->value(); 
  |  
  |          free_node(node_allocator_, size_expression_node); 
  |  
  |          const std::size_t max_vector_size = settings_.max_local_vector_size(); 
  |  
  |          if ( 
  |               (vector_size <= T(0)) || 
  |               std::not_equal_to<T>() 
  |               (T(0),vector_size - details::numeric::trunc(vector_size)) || 
  |               (static_cast<std::size_t>(vector_size) > max_vector_size) 
  |             ) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR160 - Invalid vector size. Must be an integer in the " 
  |                "range [0," + details::to_str(static_cast<std::size_t>(max_vector_size)) + "], size: " + 
  |                details::to_str(details::numeric::to_int32(vector_size)), 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          typename symbol_table_t::vector_holder_ptr vec_holder = typename symbol_table_t::vector_holder_ptr(0); 
  |  
  |          const std::size_t vec_size = static_cast<std::size_t>(details::numeric::to_int32(vector_size)); 
  |  
  |          scope_element& se = sem_.get_element(vec_name); 
  |  
  |          if (se.name == vec_name) 
  |          { 
  |             if (se.active) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR161 - Illegal redefinition of local vector: '" + vec_name + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else if ( 
  |                       (se.size == vec_size) && 
  |                       (scope_element::e_vector == se.type) 
  |                     ) 
  |             { 
  |                vec_holder = se.vec_node; 
  |                se.active  = true; 
  |                se.depth   = state_.scope_depth; 
  |                se.ref_count++; 
  |             } 
  |          } 
  |  
  |          if (0 == vec_holder) 
  |          { 
  |             scope_element nse; 
  |             nse.name      = vec_name; 
  |             nse.active    = true; 
  |             nse.ref_count = 1; 
  |             nse.type      = scope_element::e_vector; 
  |             nse.depth     = state_.scope_depth; 
  |             nse.size      = vec_size; 
  |             nse.data      = new T[vec_size]; 
  |             nse.vec_node  = new typename scope_element::vector_holder_t(reinterpret_cast<T*>(nse.data),nse.size); 
  |  
  |             details::set_zero_value(reinterpret_cast<T*>(nse.data),vec_size); 
  |  
  |             if (!sem_.add_element(nse)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR162 - Failed to add new local vector '" + vec_name + "' to SEM", 
  |                   exprtk_error_location)); 
  |  
  |                sem_.free_element(nse); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             vec_holder = nse.vec_node; 
  |  
  |             exprtk_debug(("parse_define_vector_statement() - INFO - Added new local vector: %s[%d]\n", 
  |                           nse.name.c_str(), 
  |                           static_cast<int>(nse.size))); 
  |          } 
  |  
  |          state_.activate_side_effect("parse_define_vector_statement()"); 
  |  
  |          lodge_symbol(vec_name, e_st_local_vector); 
  |  
  |          std::vector<expression_node_ptr> vec_initilizer_list; 
  |  
  |          scoped_vec_delete<expression_node_t> svd((*this),vec_initilizer_list); 
  |  
  |          bool single_value_initialiser = false; 
  |          bool range_value_initialiser  = false; 
  |          bool vec_to_vec_initialiser   = false; 
  |          bool null_initialisation      = false; 
  |  
  |          if (!token_is(token_t::e_rsqrbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR163 - Expected ']' as part of vector size definition", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (!token_is(token_t::e_eof, prsrhlpr_t::e_hold)) 
  |          { 
  |             if (!token_is(token_t::e_assign)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR164 - Expected ':=' as part of vector definition", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (token_is(token_t::e_lsqrbracket)) 
  |             { 
  |                expression_node_ptr initialiser_component = parse_expression(); 
  |  
  |                if (0 == initialiser_component) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR165 - Failed to parse first component of vector initialiser for vector: " + vec_name, 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |  
  |                vec_initilizer_list.push_back(initialiser_component); 
  |  
  |                if (token_is(token_t::e_colon)) 
  |                { 
  |                   initialiser_component = parse_expression(); 
  |  
  |                   if (0 == initialiser_component) 
  |                   { 
  |                      set_error(make_error( 
  |                         parser_error::e_syntax, 
  |                         current_token(), 
  |                         "ERR166 - Failed to parse second component of vector initialiser for vector: " + vec_name, 
  |                         exprtk_error_location)); 
  |  
  |                      return error_node(); 
  |                   } 
  |  
  |                   vec_initilizer_list.push_back(initialiser_component); 
  |                } 
  |  
  |                if (!token_is(token_t::e_rsqrbracket)) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR167 - Expected ']' to close single value vector initialiser", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |  
  |                switch (vec_initilizer_list.size()) 
  |                { 
  |                   case 1 : single_value_initialiser = true; break; 
  |                   case 2 : range_value_initialiser  = true; break; 
  |                } 
  |             } 
  |             else if (!token_is(token_t::e_lcrlbracket)) 
  |             { 
  |                expression_node_ptr initialiser = error_node(); 
  |  
  |                // Is this a vector to vector assignment and initialisation? 
  |                if (token_t::e_symbol == current_token().type) 
  |                { 
  |                   // Is it a locally defined vector? 
  |                   const scope_element& lcl_se = sem_.get_active_element(current_token().value); 
  |  
  |                   if (scope_element::e_vector == lcl_se.type) 
  |                   { 
  |                      if (0 != (initialiser = parse_expression())) 
  |                         vec_initilizer_list.push_back(initialiser); 
  |                      else 
  |                         return error_node(); 
  |                   } 
  |                   // Are we dealing with a user defined vector? 
  |                   else if (symtab_store_.is_vector(current_token().value)) 
  |                   { 
  |                      lodge_symbol(current_token().value, e_st_vector); 
  |  
  |                      if (0 != (initialiser = parse_expression())) 
  |                         vec_initilizer_list.push_back(initialiser); 
  |                      else 
  |                         return error_node(); 
  |                   } 
  |                   // Are we dealing with a null initialisation vector definition? 
  |                   else if (token_is(token_t::e_symbol,"null")) 
  |                      null_initialisation = true; 
  |                } 
  |  
  |                if (!null_initialisation) 
  |                { 
  |                   if (0 == initialiser) 
  |                   { 
  |                      set_error(make_error( 
  |                         parser_error::e_syntax, 
  |                         current_token(), 
  |                         "ERR168 - Expected '{' as part of vector initialiser list", 
  |                         exprtk_error_location)); 
  |  
  |                      return error_node(); 
  |                   } 
  |                   else 
  |                      vec_to_vec_initialiser = true; 
  |                } 
  |             } 
  |             else if (!token_is(token_t::e_rcrlbracket)) 
  |             { 
  |                for ( ; ; ) 
  |                { 
  |                   expression_node_ptr initialiser = parse_expression(); 
  |  
  |                   if (0 == initialiser) 
  |                   { 
  |                      set_error(make_error( 
  |                         parser_error::e_syntax, 
  |                         current_token(), 
  |                         "ERR169 - Expected '{' as part of vector initialiser list", 
  |                         exprtk_error_location)); 
  |  
  |                      return error_node(); 
  |                   } 
  |                   else 
  |                      vec_initilizer_list.push_back(initialiser); 
  |  
  |                   if (token_is(token_t::e_rcrlbracket)) 
  |                      break; 
  |  
  |                   const bool is_next_close = peek_token_is(token_t::e_rcrlbracket); 
  |  
  |                   if (!token_is(token_t::e_comma) && is_next_close) 
  |                   { 
  |                      set_error(make_error( 
  |                         parser_error::e_syntax, 
  |                         current_token(), 
  |                         "ERR170 - Expected ',' between vector initialisers", 
  |                         exprtk_error_location)); 
  |  
  |                      return error_node(); 
  |                   } 
  |  
  |                   if (token_is(token_t::e_rcrlbracket)) 
  |                      break; 
  |                } 
  |             } 
  |  
  |             if ( 
  |                  !token_is(token_t::e_rbracket   , prsrhlpr_t::e_hold) && 
  |                  !token_is(token_t::e_rcrlbracket, prsrhlpr_t::e_hold) && 
  |                  !token_is(token_t::e_rsqrbracket, prsrhlpr_t::e_hold) 
  |                ) 
  |             { 
  |                if (!token_is(token_t::e_eof,prsrhlpr_t::e_hold)) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR171 - Expected ';' at end of vector definition", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |             } 
  |  
  |             if ( 
  |                  !single_value_initialiser && 
  |                  !range_value_initialiser  && 
  |                  (T(vec_initilizer_list.size()) > vector_size) 
  |                ) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR172 - Initialiser list larger than the number of elements in the vector: '" + vec_name + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |  
  |          expression_node_ptr result = error_node(); 
  |  
  |          if ( 
  |               (vec_initilizer_list.size() == 1) && 
  |               single_value_initialiser 
  |             ) 
  |          { 
  |             if (details::is_constant_node(vec_initilizer_list[0])) 
  |             { 
  |               // vector_init_zero_value_node   var v[10] := [0] 
  |                if (T(0) == vec_initilizer_list[0]->value()) 
  |                { 
  |                   result = node_allocator_ 
  |                               .allocate<details::vector_init_zero_value_node<T> >( 
  |                                  (*vec_holder)[0], 
  |                                  vec_size, 
  |                                  vec_initilizer_list); 
  |                } 
  |                else 
  |                { 
  |                   // vector_init_single_constvalue_node   var v[10] := [123] 
  |                   result = node_allocator_ 
  |                               .allocate<details::vector_init_single_constvalue_node<T> >( 
  |                                  (*vec_holder)[0], 
  |                                  vec_size, 
  |                                  vec_initilizer_list); 
  |                } 
  |             } 
  |             else 
  |             { 
  |                // vector_init_single_value_node   var v[10] := [123 + (x / y)] 
  |                result = node_allocator_ 
  |                            .allocate<details::vector_init_single_value_node<T> >( 
  |                               (*vec_holder)[0], 
  |                               vec_size, 
  |                               vec_initilizer_list); 
  |             } 
  |          } 
  |          else if ( 
  |                    (vec_initilizer_list.size() == 2) && 
  |                    range_value_initialiser 
  |                  ) 
  |          { 
  |             bool base_const = details::is_constant_node(vec_initilizer_list[0]); 
  |             bool inc_const  = details::is_constant_node(vec_initilizer_list[1]); 
  |  
  |             if (base_const && inc_const) 
  |             { 
  |                // vector_init_single_value_node   var v[10] := [1 : 3.5] 
  |                result = node_allocator_ 
  |                            .allocate<details::vector_init_iota_constconst_node<T> >( 
  |                               (*vec_holder)[0], 
  |                               vec_size, 
  |                               vec_initilizer_list); 
  |             } 
  |             else if (base_const && !inc_const) 
  |             { 
  |                // vector_init_single_value_node   var v[10] := [1 : x + y] 
  |                result = node_allocator_ 
  |                            .allocate<details::vector_init_iota_constnconst_node<T> >( 
  |                               (*vec_holder)[0], 
  |                               vec_size, 
  |                               vec_initilizer_list); 
  |             } 
  |             else if (!base_const && inc_const) 
  |             { 
  |                // vector_init_single_value_node   var v[10] := [x + y : 3] 
  |                result = node_allocator_ 
  |                            .allocate<details::vector_init_iota_nconstconst_node<T> >( 
  |                               (*vec_holder)[0], 
  |                               vec_size, 
  |                               vec_initilizer_list); 
  |             } 
  |             else if (!base_const && !inc_const) 
  |             { 
  |                // vector_init_single_value_node   var v[10] := [x + y :  z / w] 
  |                result = node_allocator_ 
  |                            .allocate<details::vector_init_iota_nconstnconst_node<T> >( 
  |                               (*vec_holder)[0], 
  |                               vec_size, 
  |                               vec_initilizer_list); 
  |             } 
  |          } 
  |          else if (null_initialisation) 
  |             result = expression_generator_(T(0.0)); 
  |          else if (vec_to_vec_initialiser) 
  |          { 
  |             expression_node_ptr vec_node = node_allocator_.allocate<vector_node_t>(vec_holder); 
  |  
  |             result = expression_generator_( 
  |                         details::e_assign, 
  |                         vec_node, 
  |                         vec_initilizer_list[0]); 
  |          } 
  |          else 
  |          { 
  |             result = node_allocator_ 
  |                         .allocate<details::vector_initialisation_node<T> >( 
  |                            (*vec_holder)[0], 
  |                            vec_size, 
  |                            vec_initilizer_list, 
  |                            single_value_initialiser); 
  |          } 
  |  
  |          svd.delete_ptr = false; 
  |  
  |          if (result && result->valid()) 
  |          { 
  |             return result; 
  |          } 
  |  
  |          details::free_node(node_allocator_, result); 
  |  
  |          set_error(make_error( 
  |             parser_error::e_synthesis, 
  |             current_token(), 
  |             "ERR173 - Failed to generate initialisation node for vector: " + vec_name, 
  |             exprtk_error_location)); 
  |  
  |          return error_node(); 
  |       } 
  |  
  |       #ifndef exprtk_disable_string_capabilities 
  |       inline expression_node_ptr parse_define_string_statement(const std::string& str_name, expression_node_ptr initialisation_expression) 
  |       { 
  |          stringvar_node_t* str_node = reinterpret_cast<stringvar_node_t*>(0); 
  |  
  |          scope_element& se = sem_.get_element(str_name); 
  |  
  |          if (se.name == str_name) 
  |          { 
  |             if (se.active) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR174 - Illegal redefinition of local variable: '" + str_name + "'", 
  |                   exprtk_error_location)); 
  |  
  |                free_node(node_allocator_, initialisation_expression); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (scope_element::e_string == se.type) 
  |             { 
  |                str_node  = se.str_node; 
  |                se.active = true; 
  |                se.depth  = state_.scope_depth; 
  |                se.ref_count++; 
  |             } 
  |          } 
  |  
  |          if (0 == str_node) 
  |          { 
  |             scope_element nse; 
  |             nse.name      = str_name; 
  |             nse.active    = true; 
  |             nse.ref_count = 1; 
  |             nse.type      = scope_element::e_string; 
  |             nse.depth     = state_.scope_depth; 
  |             nse.data      = new std::string; 
  |             nse.str_node  = new stringvar_node_t(*reinterpret_cast<std::string*>(nse.data)); 
  |  
  |             if (!sem_.add_element(nse)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR175 - Failed to add new local string variable '" + str_name + "' to SEM", 
  |                   exprtk_error_location)); 
  |  
  |                free_node(node_allocator_, initialisation_expression); 
  |  
  |                sem_.free_element(nse); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             str_node = nse.str_node; 
  |  
  |             exprtk_debug(("parse_define_string_statement() - INFO - Added new local string variable: %s\n", nse.name.c_str())); 
  |          } 
  |  
  |          lodge_symbol(str_name, e_st_local_string); 
  |  
  |          state_.activate_side_effect("parse_define_string_statement()"); 
  |  
  |          expression_node_ptr branch[2] = {0}; 
  |  
  |          branch[0] = str_node; 
  |          branch[1] = initialisation_expression; 
  |  
  |          return expression_generator_(details::e_assign,branch); 
  |       } 
  |       #else 
  |       inline expression_node_ptr parse_define_string_statement(const std::string&, expression_node_ptr) 
  |       { 
  |          return error_node(); 
  |       } 
  |       #endif 
  |  
  |       inline bool local_variable_is_shadowed(const std::string& symbol) 
  |       { 
  |          const scope_element& se = sem_.get_element(symbol); 
  |          return (se.name == symbol) && se.active; 
  |       } 
  |  
  |       inline expression_node_ptr parse_define_var_statement() 
  |       { 
  |          if (settings_.vardef_disabled()) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR176 - Illegal variable definition", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (!details::imatch(current_token().value,"var")) 
  |          { 
  |             return error_node(); 
  |          } 
  |          else 
  |             next_token(); 
  |  
  |          const std::string var_name = current_token().value; 
  |  
  |          expression_node_ptr initialisation_expression = error_node(); 
  |  
  |          if (!token_is(token_t::e_symbol)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR177 - Expected a symbol for variable definition", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (details::is_reserved_symbol(var_name)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR178 - Illegal redefinition of reserved keyword: '" + var_name + "'", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (symtab_store_.symbol_exists(var_name)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR179 - Illegal redefinition of variable '" + var_name + "'", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (local_variable_is_shadowed(var_name)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR180 - Illegal redefinition of local variable: '" + var_name + "'", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (token_is(token_t::e_lsqrbracket,prsrhlpr_t::e_hold)) 
  |          { 
  |             return parse_define_vector_statement(var_name); 
  |          } 
  |          else if (token_is(token_t::e_lcrlbracket,prsrhlpr_t::e_hold)) 
  |          { 
  |             return parse_uninitialised_var_statement(var_name); 
  |          } 
  |          else if (token_is(token_t::e_assign)) 
  |          { 
  |             if (0 == (initialisation_expression = parse_expression())) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR181 - Failed to parse initialisation expression for variable '" + var_name + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |  
  |          if ( 
  |               !token_is(token_t::e_rbracket   , prsrhlpr_t::e_hold) && 
  |               !token_is(token_t::e_rcrlbracket, prsrhlpr_t::e_hold) && 
  |               !token_is(token_t::e_rsqrbracket, prsrhlpr_t::e_hold) 
  |             ) 
  |          { 
  |             if (!token_is(token_t::e_eof,prsrhlpr_t::e_hold)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR182 - Expected ';' after variable '" + var_name + "' definition", 
  |                   exprtk_error_location)); 
  |  
  |                free_node(node_allocator_, initialisation_expression); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |  
  |          if ( 
  |               (0 != initialisation_expression) && 
  |               details::is_generally_string_node(initialisation_expression) 
  |             ) 
  |          { 
  |             return parse_define_string_statement(var_name,initialisation_expression); 
  |          } 
  |  
  |          expression_node_ptr var_node = reinterpret_cast<expression_node_ptr>(0); 
  |  
  |          scope_element& se = sem_.get_element(var_name); 
  |  
  |          if (se.name == var_name) 
  |          { 
  |             if (se.active) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR183 - Illegal redefinition of local variable: '" + var_name + "'", 
  |                   exprtk_error_location)); 
  |  
  |                free_node(node_allocator_, initialisation_expression); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (scope_element::e_variable == se.type) 
  |             { 
  |                var_node  = se.var_node; 
  |                se.active = true; 
  |                se.depth  = state_.scope_depth; 
  |                se.ref_count++; 
  |             } 
  |          } 
  |  
  |          if (0 == var_node) 
  |          { 
  |             scope_element nse; 
  |             nse.name      = var_name; 
  |             nse.active    = true; 
  |             nse.ref_count = 1; 
  |             nse.type      = scope_element::e_variable; 
  |             nse.depth     = state_.scope_depth; 
  |             nse.data      = new T(T(0)); 
  |             nse.var_node  = node_allocator_.allocate<variable_node_t>(*reinterpret_cast<T*>(nse.data)); 
  |  
  |             if (!sem_.add_element(nse)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR184 - Failed to add new local variable '" + var_name + "' to SEM", 
  |                   exprtk_error_location)); 
  |  
  |                free_node(node_allocator_, initialisation_expression); 
  |  
  |                sem_.free_element(nse); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             var_node = nse.var_node; 
  |  
  |             exprtk_debug(("parse_define_var_statement() - INFO - Added new local variable: %s\n", nse.name.c_str())); 
  |          } 
  |  
  |          state_.activate_side_effect("parse_define_var_statement()"); 
  |  
  |          lodge_symbol(var_name, e_st_local_variable); 
  |  
  |          expression_node_ptr branch[2] = {0}; 
  |  
  |          branch[0] = var_node; 
  |          branch[1] = initialisation_expression ? initialisation_expression : expression_generator_(T(0)); 
  |  
  |          return expression_generator_(details::e_assign,branch); 
  |       } 
  |  
  |       inline expression_node_ptr parse_define_constvar_statement() 
  |       { 
  |          if (settings_.vardef_disabled()) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR185 - Illegal const variable definition", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (!token_is("const")) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR186 - Expected 'const' keyword for const-variable definition", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (!token_is("var")) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR187 - Expected 'var' keyword for const-variable definition", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          const std::string var_name = current_token().value; 
  |  
  |          expression_node_ptr initialisation_expression = error_node(); 
  |  
  |          if (!token_is(token_t::e_symbol)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR188 - Expected a symbol for const-variable definition", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (details::is_reserved_symbol(var_name)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR189 - Illegal redefinition of reserved keyword: '" + var_name + "'", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (symtab_store_.symbol_exists(var_name)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR190 - Illegal redefinition of variable '" + var_name + "'", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (local_variable_is_shadowed(var_name)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR191 - Illegal redefinition of local variable: '" + var_name + "'", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (token_is(token_t::e_assign)) 
  |          { 
  |             if (0 == (initialisation_expression = parse_expression())) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR192 - Failed to parse initialisation expression for const-variable: '" + var_name + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (!details::is_literal_node(initialisation_expression)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR193 - initialisation expression for const-variable: '" + var_name + "' must be a constant/literal", 
  |                   exprtk_error_location)); 
  |  
  |                free_node(node_allocator_, initialisation_expression); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |  
  |          const T init_value = initialisation_expression->value(); 
  |  
  |          free_node(node_allocator_, initialisation_expression); 
  |  
  |          expression_node_ptr var_node = reinterpret_cast<expression_node_ptr>(0); 
  |  
  |          scope_element& se = sem_.get_element(var_name); 
  |  
  |          if (se.name == var_name) 
  |          { 
  |             if (se.active) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR194 - Illegal redefinition of local variable: '" + var_name + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (scope_element::e_literal == se.type) 
  |             { 
  |                var_node  = se.var_node; 
  |                se.active = true; 
  |                se.depth  = state_.scope_depth; 
  |                se.ref_count++; 
  |             } 
  |          } 
  |  
  |          if (0 == var_node) 
  |          { 
  |             scope_element nse; 
  |             nse.name      = var_name; 
  |             nse.active    = true; 
  |             nse.ref_count = 1; 
  |             nse.type      = scope_element::e_literal; 
  |             nse.depth     = state_.scope_depth; 
  |             nse.data      = 0; 
  |             nse.var_node  = node_allocator_.allocate<literal_node_t>(init_value); 
  |  
  |             if (!sem_.add_element(nse)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR195 - Failed to add new local const-variable '" + var_name + "' to SEM", 
  |                   exprtk_error_location)); 
  |  
  |                sem_.free_element(nse); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             var_node = nse.var_node; 
  |  
  |             exprtk_debug(("parse_define_constvar_statement() - INFO - Added new local const-variable: %s\n", nse.name.c_str())); 
  |          } 
  |  
  |          state_.activate_side_effect("parse_define_constvar_statement()"); 
  |  
  |          lodge_symbol(var_name, e_st_local_variable); 
  |  
  |          return expression_generator_(var_node->value()); 
  |       } 
  |  
  |       inline expression_node_ptr parse_uninitialised_var_statement(const std::string& var_name) 
  |       { 
  |          if ( 
  |               !token_is(token_t::e_lcrlbracket) || 
  |               !token_is(token_t::e_rcrlbracket) 
  |             ) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR196 - Expected a '{}' for uninitialised var definition", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (!token_is(token_t::e_eof,prsrhlpr_t::e_hold)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR197 - Expected ';' after uninitialised variable definition", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          expression_node_ptr var_node = reinterpret_cast<expression_node_ptr>(0); 
  |  
  |          scope_element& se = sem_.get_element(var_name); 
  |  
  |          if (se.name == var_name) 
  |          { 
  |             if (se.active) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR198 - Illegal redefinition of local variable: '" + var_name + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (scope_element::e_variable == se.type) 
  |             { 
  |                var_node  = se.var_node; 
  |                se.active = true; 
  |                se.ref_count++; 
  |             } 
  |          } 
  |  
  |          if (0 == var_node) 
  |          { 
  |             scope_element nse; 
  |             nse.name      = var_name; 
  |             nse.active    = true; 
  |             nse.ref_count = 1; 
  |             nse.type      = scope_element::e_variable; 
  |             nse.depth     = state_.scope_depth; 
  |             nse.ip_index  = sem_.next_ip_index(); 
  |             nse.data      = new T(T(0)); 
  |             nse.var_node  = node_allocator_.allocate<variable_node_t>(*reinterpret_cast<T*>(nse.data)); 
  |  
  |             if (!sem_.add_element(nse)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR199 - Failed to add new local variable '" + var_name + "' to SEM", 
  |                   exprtk_error_location)); 
  |  
  |                sem_.free_element(nse); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             exprtk_debug(("parse_uninitialised_var_statement() - INFO - Added new local variable: %s\n", 
  |                           nse.name.c_str())); 
  |          } 
  |  
  |          lodge_symbol(var_name, e_st_local_variable); 
  |  
  |          state_.activate_side_effect("parse_uninitialised_var_statement()"); 
  |  
  |          return expression_generator_(T(0)); 
  |       } 
  |  
  |       inline expression_node_ptr parse_swap_statement() 
  |       { 
  |          if (!details::imatch(current_token().value,"swap")) 
  |          { 
  |             return error_node(); 
  |          } 
  |          else 
  |             next_token(); 
  |  
  |          if (!token_is(token_t::e_lbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR200 - Expected '(' at start of swap statement", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          expression_node_ptr variable0 = error_node(); 
  |          expression_node_ptr variable1 = error_node(); 
  |  
  |          bool variable0_generated = false; 
  |          bool variable1_generated = false; 
  |  
  |          const std::string var0_name = current_token().value; 
  |  
  |          if (!token_is(token_t::e_symbol,prsrhlpr_t::e_hold)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR201 - Expected a symbol for variable or vector element definition", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (peek_token_is(token_t::e_lsqrbracket)) 
  |          { 
  |             if (0 == (variable0 = parse_vector())) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR202 - First parameter to swap is an invalid vector element: '" + var0_name + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             variable0_generated = true; 
  |          } 
  |          else 
  |          { 
  |             if (symtab_store_.is_variable(var0_name)) 
  |             { 
  |                variable0 = symtab_store_.get_variable(var0_name); 
  |             } 
  |  
  |             const scope_element& se = sem_.get_element(var0_name); 
  |  
  |             if ( 
  |                  (se.active)            && 
  |                  (se.name == var0_name) && 
  |                  (scope_element::e_variable == se.type) 
  |                ) 
  |             { 
  |                variable0 = se.var_node; 
  |             } 
  |  
  |             lodge_symbol(var0_name, e_st_variable); 
  |  
  |             if (0 == variable0) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR203 - First parameter to swap is an invalid variable: '" + var0_name + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else 
  |                next_token(); 
  |          } 
  |  
  |          if (!token_is(token_t::e_comma)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR204 - Expected ',' between parameters to swap", 
  |                exprtk_error_location)); 
  |  
  |             if (variable0_generated) 
  |             { 
  |                free_node(node_allocator_, variable0); 
  |             } 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          const std::string var1_name = current_token().value; 
  |  
  |          if (!token_is(token_t::e_symbol,prsrhlpr_t::e_hold)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR205 - Expected a symbol for variable or vector element definition", 
  |                exprtk_error_location)); 
  |  
  |             if (variable0_generated) 
  |             { 
  |                free_node(node_allocator_, variable0); 
  |             } 
  |  
  |             return error_node(); 
  |          } 
  |          else if (peek_token_is(token_t::e_lsqrbracket)) 
  |          { 
  |             if (0 == (variable1 = parse_vector())) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR206 - Second parameter to swap is an invalid vector element: '" + var1_name + "'", 
  |                   exprtk_error_location)); 
  |  
  |                if (variable0_generated) 
  |                { 
  |                   free_node(node_allocator_, variable0); 
  |                } 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             variable1_generated = true; 
  |          } 
  |          else 
  |          { 
  |             if (symtab_store_.is_variable(var1_name)) 
  |             { 
  |                variable1 = symtab_store_.get_variable(var1_name); 
  |             } 
  |  
  |             const scope_element& se = sem_.get_element(var1_name); 
  |  
  |             if ( 
  |                  (se.active) && 
  |                  (se.name == var1_name) && 
  |                  (scope_element::e_variable == se.type) 
  |                ) 
  |             { 
  |                variable1 = se.var_node; 
  |             } 
  |  
  |             lodge_symbol(var1_name, e_st_variable); 
  |  
  |             if (0 == variable1) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR207 - Second parameter to swap is an invalid variable: '" + var1_name + "'", 
  |                   exprtk_error_location)); 
  |  
  |                if (variable0_generated) 
  |                { 
  |                   free_node(node_allocator_, variable0); 
  |                } 
  |  
  |                return error_node(); 
  |             } 
  |             else 
  |                next_token(); 
  |          } 
  |  
  |          if (!token_is(token_t::e_rbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR208 - Expected ')' at end of swap statement", 
  |                exprtk_error_location)); 
  |  
  |             if (variable0_generated) 
  |             { 
  |                free_node(node_allocator_, variable0); 
  |             } 
  |  
  |             if (variable1_generated) 
  |             { 
  |                free_node(node_allocator_, variable1); 
  |             } 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          typedef details::variable_node<T>* variable_node_ptr; 
  |  
  |          variable_node_ptr v0 = variable_node_ptr(0); 
  |          variable_node_ptr v1 = variable_node_ptr(0); 
  |  
  |          expression_node_ptr result = error_node(); 
  |  
  |          if ( 
  |               (0 != (v0 = dynamic_cast<variable_node_ptr>(variable0))) && 
  |               (0 != (v1 = dynamic_cast<variable_node_ptr>(variable1))) 
  |             ) 
  |          { 
  |             result = node_allocator_.allocate<details::swap_node<T> >(v0, v1); 
  |  
  |             if (variable0_generated) 
  |             { 
  |                free_node(node_allocator_, variable0); 
  |             } 
  |  
  |             if (variable1_generated) 
  |             { 
  |                free_node(node_allocator_, variable1); 
  |             } 
  |          } 
  |          else 
  |             result = node_allocator_.allocate<details::swap_generic_node<T> > 
  |                         (variable0, variable1); 
  |  
  |          state_.activate_side_effect("parse_swap_statement()"); 
  |  
  |          return result; 
  |       } 
  |  
  |       #ifndef exprtk_disable_return_statement 
  |       inline expression_node_ptr parse_return_statement() 
  |       { 
  |          if (state_.parsing_return_stmt) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR209 - Return call within a return call is not allowed", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          scoped_bool_negator sbn(state_.parsing_return_stmt); 
  |  
  |          std::vector<expression_node_ptr> arg_list; 
  |  
  |          scoped_vec_delete<expression_node_t> sdd((*this),arg_list); 
  |  
  |          if (!details::imatch(current_token().value,"return")) 
  |          { 
  |             return error_node(); 
  |          } 
  |          else 
  |             next_token(); 
  |  
  |          if (!token_is(token_t::e_lsqrbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR210 - Expected '[' at start of return statement", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else if (!token_is(token_t::e_rsqrbracket)) 
  |          { 
  |             for ( ; ; ) 
  |             { 
  |                expression_node_ptr arg = parse_expression(); 
  |  
  |                if (0 == arg) 
  |                   return error_node(); 
  |  
  |                arg_list.push_back(arg); 
  |  
  |                if (token_is(token_t::e_rsqrbracket)) 
  |                   break; 
  |                else if (!token_is(token_t::e_comma)) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR211 - Expected ',' between values during call to return", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |             } 
  |          } 
  |          else if (settings_.zero_return_disabled()) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR212 - Zero parameter return statement not allowed", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          const lexer::token prev_token = current_token(); 
  |  
  |          if (token_is(token_t::e_rsqrbracket)) 
  |          { 
  |             if (!arg_list.empty()) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   prev_token, 
  |                   "ERR213 - Invalid ']' found during return call", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |  
  |          std::string ret_param_type_list; 
  |  
  |          for (std::size_t i = 0; i < arg_list.size(); ++i) 
  |          { 
  |             if (0 == arg_list[i]) 
  |                return error_node(); 
  |             else if (is_ivector_node(arg_list[i])) 
  |                ret_param_type_list += 'V'; 
  |             else if (is_generally_string_node(arg_list[i])) 
  |                ret_param_type_list += 'S'; 
  |             else 
  |                ret_param_type_list += 'T'; 
  |          } 
  |  
  |          dec_.retparam_list_.push_back(ret_param_type_list); 
  |  
  |          expression_node_ptr result = expression_generator_.return_call(arg_list); 
  |  
  |          sdd.delete_ptr = (0 == result); 
  |  
  |          state_.return_stmt_present = true; 
  |  
  |          state_.activate_side_effect("parse_return_statement()"); 
  |  
  |          return result; 
  |       } 
  |       #else 
  |       inline expression_node_ptr parse_return_statement() 
  |       { 
  |          return error_node(); 
  |       } 
  |       #endif 
  |  
  |       inline expression_node_ptr parse_assert_statement() 
  |       { 
  |          assert(details::imatch(current_token().value, "assert")); 
  |  
  |          if (state_.parsing_assert_stmt) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR214 - Assert statement within an assert statement is not allowed", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          scoped_bool_negator sbn(state_.parsing_assert_stmt); 
  |  
  |          next_token(); 
  |  
  |          std::vector<expression_node_ptr> assert_arg_list(3, error_node()); 
  |          scoped_vec_delete<expression_node_t> sdd((*this), assert_arg_list); 
  |  
  |          expression_node_ptr& assert_condition = assert_arg_list[0]; 
  |          expression_node_ptr& assert_message   = assert_arg_list[1]; 
  |          expression_node_ptr& assert_id        = assert_arg_list[2]; 
  |  
  |          if (!token_is(token_t::e_lbracket)) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR215 - Expected '(' at start of assert statement", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          const token_t start_token = current_token(); 
  |  
  |          // Parse the assert condition 
  |          if (0 == (assert_condition = parse_expression())) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR216 - Failed to parse condition for assert statement", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          const token_t end_token = current_token(); 
  |  
  |          if (!token_is(token_t::e_rbracket)) 
  |          { 
  |             if (!token_is(token_t::e_comma)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR217 - Expected ',' between condition and message for assert statement", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             // Parse the assert message 
  |             else if ( 
  |                       (0 == (assert_message = parse_expression())) || 
  |                       !details::is_generally_string_node(assert_message) 
  |                     ) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR218 - " + 
  |                   (assert_message ? 
  |                   std::string("Expected string for assert message") : 
  |                   std::string("Failed to parse message for assert statement")), 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (!token_is(token_t::e_rbracket)) 
  |             { 
  |                if (!token_is(token_t::e_comma)) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR219 - Expected ',' between message and ID for assert statement", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |                // Parse assert ID 
  |                else if ( 
  |                          (0 == (assert_id = parse_expression())) || 
  |                          !details::is_const_string_node(assert_id) 
  |                        ) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR220 - " + 
  |                      (assert_id ? 
  |                      std::string("Expected literal string for assert ID") : 
  |                      std::string("Failed to parse string for assert ID")), 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |                else if (!token_is(token_t::e_rbracket)) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR221 - Expected ')' at start of assert statement", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |             } 
  |          } 
  |  
  |          exprtk::assert_check::assert_context context; 
  |          context.condition = lexer().substr(start_token.position, end_token.position); 
  |          context.offet     = start_token.position; 
  |  
  |          if (0 == assert_check_) 
  |          { 
  |             exprtk_debug(("parse_assert_statement() - assert functionality is disabled. assert condition: %s\n", 
  |                           context.condition.c_str())); 
  |  
  |             return new details::null_node<T>(); 
  |          } 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          if (assert_message && details::is_const_string_node(assert_message)) 
  |          { 
  |             context.message = dynamic_cast<details::string_base_node<T>*>(assert_message)->str(); 
  |          } 
  |  
  |          if (assert_id && details::is_const_string_node(assert_id)) 
  |          { 
  |             context.id = dynamic_cast<details::string_base_node<T>*>(assert_id)->str(); 
  |  
  |             if (assert_ids_.end() != assert_ids_.find(context.id)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR222 - Duplicate assert ID: " + context.id, 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             assert_ids_.insert(context.id); 
  |             free_node(node_allocator_, assert_id); 
  |          } 
  |          #endif 
  |  
  |          expression_node_ptr result_node = 
  |             expression_generator_.assert_call( 
  |                assert_condition, 
  |                assert_message, 
  |                context); 
  |  
  |          exprtk_debug(("parse_assert_statement() - assert condition: [%s]\n", context.condition.c_str()      )); 
  |          exprtk_debug(("parse_assert_statement() - assert message:   [%s]\n", context.message  .c_str()      )); 
  |          exprtk_debug(("parse_assert_statement() - assert id:        [%s]\n", context.id       .c_str()      )); 
  |          exprtk_debug(("parse_assert_statement() - assert offset:    [%d]\n", static_cast<int>(context.offet))); 
  |  
  |          if (0 == result_node) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR223 - Failed to synthesize assert", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          sdd.delete_ptr = false; 
  |          return result_node; 
  |       } 
  |  
  |       inline bool post_variable_process(const std::string& symbol) 
  |       { 
  |          if ( 
  |               peek_token_is(token_t::e_lbracket   ) || 
  |               peek_token_is(token_t::e_lcrlbracket) || 
  |               peek_token_is(token_t::e_lsqrbracket) 
  |             ) 
  |          { 
  |             if (!settings_.commutative_check_enabled()) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR224 - Invalid sequence of variable '" + symbol + "' and bracket", 
  |                   exprtk_error_location)); 
  |  
  |                return false; 
  |             } 
  |  
  |             lexer().insert_front(token_t::e_mul); 
  |          } 
  |  
  |          return true; 
  |       } 
  |  
  |       inline bool post_bracket_process(const typename token_t::token_type& token, expression_node_ptr& branch) 
  |       { 
  |          bool implied_mul = false; 
  |  
  |          if (details::is_generally_string_node(branch)) 
  |             return true; 
  |  
  |          if (details::is_ivector_node(branch)) 
  |             return true; 
  |  
  |          const lexer::parser_helper::token_advance_mode hold = prsrhlpr_t::e_hold; 
  |  
  |          switch (token) 
  |          { 
  |             case token_t::e_lcrlbracket : implied_mul = token_is(token_t::e_lbracket   , hold) || 
  |                                                         token_is(token_t::e_lcrlbracket, hold) || 
  |                                                         token_is(token_t::e_lsqrbracket, hold) ; 
  |                                           break; 
  |  
  |             case token_t::e_lbracket    : implied_mul = token_is(token_t::e_lbracket   , hold) || 
  |                                                         token_is(token_t::e_lcrlbracket, hold) || 
  |                                                         token_is(token_t::e_lsqrbracket, hold) ; 
  |                                           break; 
  |  
  |             case token_t::e_lsqrbracket : implied_mul = token_is(token_t::e_lbracket   , hold) || 
  |                                                         token_is(token_t::e_lcrlbracket, hold) || 
  |                                                         token_is(token_t::e_lsqrbracket, hold) ; 
  |                                           break; 
  |  
  |             default                     : return true; 
  |          } 
  |  
  |          if (implied_mul) 
  |          { 
  |             if (!settings_.commutative_check_enabled()) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR225 - Invalid sequence of brackets", 
  |                   exprtk_error_location)); 
  |  
  |                return false; 
  |             } 
  |             else if (token_t::e_eof != current_token().type) 
  |             { 
  |                lexer().insert_front(current_token().type); 
  |                lexer().insert_front(token_t::e_mul); 
  |                next_token(); 
  |             } 
  |          } 
  |  
  |          return true; 
  |       } 
  |  
  |       typedef typename interval_container_t<const void*>::interval_t interval_t; 
  |       typedef interval_container_t<const void*> immutable_memory_map_t; 
  |       typedef std::map<interval_t,token_t> immutable_symtok_map_t; 
  |  
  |       inline interval_t make_memory_range(const T& t) 
  |       { 
  |          const T* begin = reinterpret_cast<const T*>(&t); 
  |          const T* end   = begin + 1; 
  |          return interval_t(begin, end); 
  |       } 
  |  
  |       inline interval_t make_memory_range(const T* begin, const std::size_t size) 
  |       { 
  |          return interval_t(begin, begin + size); 
  |       } 
  |  
  |       inline interval_t make_memory_range(details::char_cptr begin, const std::size_t size) 
  |       { 
  |          return interval_t(begin, begin + size); 
  |       } 
  |  
  |       void lodge_immutable_symbol(const lexer::token& token, const interval_t interval) 
  |       { 
  |          immutable_memory_map_.add_interval(interval); 
  |          immutable_symtok_map_[interval] = token; 
  |       } 
  |  
  |       inline expression_node_ptr parse_symtab_symbol() 
  |       { 
  |          const std::string symbol = current_token().value; 
  |  
  |          // Are we dealing with a variable or a special constant? 
  |          typedef typename symtab_store::variable_context var_ctxt_t; 
  |          var_ctxt_t var_ctx = symtab_store_.get_variable_context(symbol); 
  |  
  |          if (var_ctx.variable) 
  |          { 
  |             assert(var_ctx.symbol_table); 
  |  
  |             expression_node_ptr result_variable = var_ctx.variable; 
  |  
  |             if (symtab_store_.is_constant_node(symbol)) 
  |             { 
  |                result_variable = expression_generator_(var_ctx.variable->value()); 
  |             } 
  |             else if (symbol_table_t::e_immutable == var_ctx.symbol_table->mutability()) 
  |             { 
  |                lodge_immutable_symbol(current_token(), make_memory_range(var_ctx.variable->ref())); 
  |                result_variable = var_ctx.variable; 
  |             } 
  |  
  |             if (!post_variable_process(symbol)) 
  |                return error_node(); 
  |  
  |             lodge_symbol(symbol, e_st_variable); 
  |  
  |             next_token(); 
  |  
  |             return result_variable; 
  |          } 
  |  
  |          // Are we dealing with a locally defined variable, vector or string? 
  |          if (!sem_.empty()) 
  |          { 
  |             scope_element& se = sem_.get_active_element(symbol); 
  |  
  |             if (se.active && details::imatch(se.name, symbol)) 
  |             { 
  |                if ( 
  |                     (scope_element::e_variable == se.type) || 
  |                     (scope_element::e_literal  == se.type) 
  |                   ) 
  |                { 
  |                   se.active = true; 
  |                   lodge_symbol(symbol, e_st_local_variable); 
  |  
  |                   if (!post_variable_process(symbol)) 
  |                      return error_node(); 
  |  
  |                   next_token(); 
  |  
  |                   return (scope_element::e_variable == se.type) ? 
  |                            se.var_node : 
  |                            expression_generator_(se.var_node->value()); 
  |                } 
  |                else if (scope_element::e_vector == se.type) 
  |                { 
  |                   return parse_vector(); 
  |                } 
  |                #ifndef exprtk_disable_string_capabilities 
  |                else if (scope_element::e_string == se.type) 
  |                { 
  |                   return parse_string(); 
  |                } 
  |                #endif 
  |             } 
  |          } 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          // Are we dealing with a string variable? 
  |          if (symtab_store_.is_stringvar(symbol)) 
  |          { 
  |             return parse_string(); 
  |          } 
  |          #endif 
  |  
  |          { 
  |             // Are we dealing with a function? 
  |             ifunction<T>* function = symtab_store_.get_function(symbol); 
  |  
  |             if (function) 
  |             { 
  |                lodge_symbol(symbol, e_st_function); 
  |  
  |                expression_node_ptr func_node = 
  |                                       parse_function_invocation(function,symbol); 
  |  
  |                if (func_node) 
  |                   return func_node; 
  |                else 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR226 - Failed to generate node for function: '" + symbol + "'", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |             } 
  |          } 
  |  
  |          { 
  |             // Are we dealing with a vararg function? 
  |             ivararg_function<T>* vararg_function = symtab_store_.get_vararg_function(symbol); 
  |  
  |             if (vararg_function) 
  |             { 
  |                lodge_symbol(symbol, e_st_function); 
  |  
  |                expression_node_ptr vararg_func_node = 
  |                                       parse_vararg_function_call(vararg_function, symbol); 
  |  
  |                if (vararg_func_node) 
  |                   return vararg_func_node; 
  |                else 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR227 - Failed to generate node for vararg function: '" + symbol + "'", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |             } 
  |          } 
  |  
  |          { 
  |             // Are we dealing with a vararg generic function? 
  |             igeneric_function<T>* generic_function = symtab_store_.get_generic_function(symbol); 
  |  
  |             if (generic_function) 
  |             { 
  |                lodge_symbol(symbol, e_st_function); 
  |  
  |                expression_node_ptr genericfunc_node = 
  |                                       parse_generic_function_call(generic_function, symbol); 
  |  
  |                if (genericfunc_node) 
  |                   return genericfunc_node; 
  |                else 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR228 - Failed to generate node for generic function: '" + symbol + "'", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |             } 
  |          } 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          { 
  |             // Are we dealing with a vararg string returning function? 
  |             igeneric_function<T>* string_function = symtab_store_.get_string_function(symbol); 
  |  
  |             if (string_function) 
  |             { 
  |                lodge_symbol(symbol, e_st_function); 
  |  
  |                expression_node_ptr stringfunc_node = 
  |                                       parse_string_function_call(string_function, symbol); 
  |  
  |                if (stringfunc_node) 
  |                   return stringfunc_node; 
  |                else 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR229 - Failed to generate node for string function: '" + symbol + "'", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |             } 
  |          } 
  |  
  |          { 
  |             // Are we dealing with a vararg overloaded scalar/string returning function? 
  |             igeneric_function<T>* overload_function = symtab_store_.get_overload_function(symbol); 
  |  
  |             if (overload_function) 
  |             { 
  |                lodge_symbol(symbol, e_st_function); 
  |  
  |                expression_node_ptr overloadfunc_node = 
  |                                       parse_overload_function_call(overload_function, symbol); 
  |  
  |                if (overloadfunc_node) 
  |                   return overloadfunc_node; 
  |                else 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR230 - Failed to generate node for overload function: '" + symbol + "'", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |             } 
  |          } 
  |          #endif 
  |  
  |          // Are we dealing with a vector? 
  |          if (symtab_store_.is_vector(symbol)) 
  |          { 
  |             lodge_symbol(symbol, e_st_vector); 
  |             return parse_vector(); 
  |          } 
  |  
  |          if (details::is_reserved_symbol(symbol)) 
  |          { 
  |                if ( 
  |                     settings_.function_enabled(symbol) || 
  |                     !details::is_base_function(symbol) 
  |                   ) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_syntax, 
  |                      current_token(), 
  |                      "ERR231 - Invalid use of reserved symbol '" + symbol + "'", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |          } 
  |  
  |          // Should we handle unknown symbols? 
  |          if (resolve_unknown_symbol_ && unknown_symbol_resolver_) 
  |          { 
  |             if (!(settings_.rsrvd_sym_usr_disabled() && details::is_reserved_symbol(symbol))) 
  |             { 
  |                symbol_table_t& symtab = symtab_store_.get_symbol_table(); 
  |  
  |                std::string error_message; 
  |  
  |                if (unknown_symbol_resolver::e_usrmode_default == unknown_symbol_resolver_->mode) 
  |                { 
  |                   T default_value = T(0); 
  |  
  |                   typename unknown_symbol_resolver::usr_symbol_type usr_symbol_type = unknown_symbol_resolver::e_usr_unknown_type; 
  |  
  |                   if (unknown_symbol_resolver_->process(symbol, usr_symbol_type, default_value, error_message)) 
  |                   { 
  |                      bool create_result = false; 
  |  
  |                      switch (usr_symbol_type) 
  |                      { 
  |                         case unknown_symbol_resolver::e_usr_variable_type : 
  |                            create_result = symtab.create_variable(symbol, default_value); 
  |                            break; 
  |  
  |                         case unknown_symbol_resolver::e_usr_constant_type : 
  |                            create_result = symtab.add_constant(symbol, default_value); 
  |                            break; 
  |  
  |                         default                                           : create_result = false; 
  |                      } 
  |  
  |                      if (create_result) 
  |                      { 
  |                         expression_node_ptr var = symtab_store_.get_variable(symbol); 
  |  
  |                         if (var) 
  |                         { 
  |                            if (symtab_store_.is_constant_node(symbol)) 
  |                            { 
  |                               var = expression_generator_(var->value()); 
  |                            } 
  |  
  |                            lodge_symbol(symbol, e_st_variable); 
  |  
  |                            if (!post_variable_process(symbol)) 
  |                               return error_node(); 
  |  
  |                            next_token(); 
  |  
  |                            return var; 
  |                         } 
  |                      } 
  |                   } 
  |  
  |                   set_error(make_error( 
  |                      parser_error::e_symtab, 
  |                      current_token(), 
  |                      "ERR232 - Failed to create variable: '" + symbol + "'" + 
  |                      (error_message.empty() ? "" : " - " + error_message), 
  |                      exprtk_error_location)); 
  |  
  |                } 
  |                else if (unknown_symbol_resolver::e_usrmode_extended == unknown_symbol_resolver_->mode) 
  |                { 
  |                   if (unknown_symbol_resolver_->process(symbol, symtab, error_message)) 
  |                   { 
  |                      expression_node_ptr result = parse_symtab_symbol(); 
  |  
  |                      if (result) 
  |                      { 
  |                         return result; 
  |                      } 
  |                   } 
  |  
  |                   set_error(make_error( 
  |                      parser_error::e_symtab, 
  |                      current_token(), 
  |                      "ERR233 - Failed to resolve symbol: '" + symbol + "'" + 
  |                      (error_message.empty() ? "" : " - " + error_message), 
  |                      exprtk_error_location)); 
  |                } 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |  
  |          set_error(make_error( 
  |             parser_error::e_syntax, 
  |             current_token(), 
  |             "ERR234 - Undefined symbol: '" + symbol + "'", 
  |             exprtk_error_location)); 
  |  
  |          return error_node(); 
  |       } 
  |  
  |       inline expression_node_ptr check_block_statement_closure(expression_node_ptr expression) 
  |       { 
  |          if ( 
  |               expression && 
  |               ( 
  |                 (current_token().type == token_t::e_symbol) || 
  |                 (current_token().type == token_t::e_number) 
  |               ) 
  |             ) 
  |          { 
  |             free_node(node_allocator_, expression); 
  |  
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR235 - Invalid syntax '" + current_token().value  + "' possible missing operator or context", 
  |                exprtk_error_location)); 
  |  
  |                return error_node(); 
  |          } 
  |  
  |          return expression; 
  |       } 
  |  
  |       inline expression_node_ptr parse_symbol() 
  |       { 
  |          static const std::string symbol_if       = "if"      ; 
  |          static const std::string symbol_while    = "while"   ; 
  |          static const std::string symbol_repeat   = "repeat"  ; 
  |          static const std::string symbol_for      = "for"     ; 
  |          static const std::string symbol_switch   = "switch"  ; 
  |          static const std::string symbol_null     = "null"    ; 
  |          static const std::string symbol_break    = "break"   ; 
  |          static const std::string symbol_continue = "continue" 
  |          static const std::string symbol_var      = "var"     ; 
  |          static const std::string symbol_const    = "const"   ; 
  |          static const std::string symbol_swap     = "swap"    ; 
  |          static const std::string symbol_return   = "return"  ; 
  |          static const std::string symbol_not      = "not"     ; 
  |          static const std::string symbol_assert   = "assert"  ; 
  |  
  |          const std::string symbol = current_token().value; 
  |  
  |          if (valid_vararg_operation(symbol)) 
  |          { 
  |             return parse_vararg_function(); 
  |          } 
  |          else if (details::imatch(symbol, symbol_not)) 
  |          { 
  |             return parse_not_statement(); 
  |          } 
  |          else if (valid_base_operation(symbol)) 
  |          { 
  |             return parse_base_operation(); 
  |          } 
  |          else if ( 
  |                    details::imatch(symbol, symbol_if) && 
  |                    settings_.control_struct_enabled(symbol) 
  |                  ) 
  |          { 
  |             return parse_conditional_statement(); 
  |          } 
  |          else if ( 
  |                    details::imatch(symbol, symbol_while) && 
  |                    settings_.control_struct_enabled(symbol) 
  |                  ) 
  |          { 
  |             return check_block_statement_closure(parse_while_loop()); 
  |          } 
  |          else if ( 
  |                    details::imatch(symbol, symbol_repeat) && 
  |                    settings_.control_struct_enabled(symbol) 
  |                  ) 
  |          { 
  |             return check_block_statement_closure(parse_repeat_until_loop()); 
  |          } 
  |          else if ( 
  |                    details::imatch(symbol, symbol_for) && 
  |                    settings_.control_struct_enabled(symbol) 
  |                  ) 
  |          { 
  |             return check_block_statement_closure(parse_for_loop()); 
  |          } 
  |          else if ( 
  |                    details::imatch(symbol, symbol_switch) && 
  |                    settings_.control_struct_enabled(symbol) 
  |                  ) 
  |          { 
  |             return check_block_statement_closure(parse_switch_statement()); 
  |          } 
  |          else if (details::is_valid_sf_symbol(symbol)) 
  |          { 
  |             return parse_special_function(); 
  |          } 
  |          else if (details::imatch(symbol, symbol_null)) 
  |          { 
  |             return parse_null_statement(); 
  |          } 
  |          #ifndef exprtk_disable_break_continue 
  |          else if (details::imatch(symbol, symbol_break)) 
  |          { 
  |             return parse_break_statement(); 
  |          } 
  |          else if (details::imatch(symbol, symbol_continue)) 
  |          { 
  |             return parse_continue_statement(); 
  |          } 
  |          #endif 
  |          else if (details::imatch(symbol, symbol_var)) 
  |          { 
  |             return parse_define_var_statement(); 
  |          } 
  |          else if (details::imatch(symbol, symbol_const)) 
  |          { 
  |             return parse_define_constvar_statement(); 
  |          } 
  |          else if (details::imatch(symbol, symbol_swap)) 
  |          { 
  |             return parse_swap_statement(); 
  |          } 
  |          #ifndef exprtk_disable_return_statement 
  |          else if ( 
  |                    details::imatch(symbol, symbol_return) && 
  |                    settings_.control_struct_enabled(symbol) 
  |                  ) 
  |          { 
  |             return check_block_statement_closure(parse_return_statement()); 
  |          } 
  |          #endif 
  |          else if (details::imatch(symbol, symbol_assert)) 
  |          { 
  |             return parse_assert_statement(); 
  |          } 
  |          else if (symtab_store_.valid() || !sem_.empty()) 
  |          { 
  |             return parse_symtab_symbol(); 
  |          } 
  |          else 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_symtab, 
  |                current_token(), 
  |                "ERR236 - Unknown variable or function encountered. Symbol table(s) " 
  |                "is either invalid or does not contain symbol: '" + symbol + "'", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |       } 
  |  
  |       inline expression_node_ptr parse_branch(precedence_level precedence = e_level00) 
  |       { 
  |          stack_limit_handler slh(*this); 
  |  
  |          if (!slh) 
  |          { 
  |             return error_node(); 
  |          } 
  |  
  |          expression_node_ptr branch = error_node(); 
  |  
  |          if (token_t::e_number == current_token().type) 
  |          { 
  |             T numeric_value = T(0); 
  |  
  |             if (details::string_to_real(current_token().value, numeric_value)) 
  |             { 
  |                expression_node_ptr literal_exp = expression_generator_(numeric_value); 
  |  
  |                if (0 == literal_exp) 
  |                { 
  |                   set_error(make_error( 
  |                      parser_error::e_numeric, 
  |                      current_token(), 
  |                      "ERR237 - Failed generate node for scalar: '" + current_token().value + "'", 
  |                      exprtk_error_location)); 
  |  
  |                   return error_node(); 
  |                } 
  |  
  |                next_token(); 
  |                branch = literal_exp; 
  |             } 
  |             else 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_numeric, 
  |                   current_token(), 
  |                   "ERR238 - Failed to convert '" + current_token().value + "' to a number", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |          else if (token_t::e_symbol == current_token().type) 
  |          { 
  |             branch = parse_symbol(); 
  |          } 
  |          #ifndef exprtk_disable_string_capabilities 
  |          else if (token_t::e_string == current_token().type) 
  |          { 
  |             branch = parse_const_string(); 
  |          } 
  |          #endif 
  |          else if (token_t::e_lbracket == current_token().type) 
  |          { 
  |             next_token(); 
  |  
  |             if (0 == (branch = parse_expression())) 
  |             { 
  |                return error_node(); 
  |             } 
  |  
  |             token_is(token_t::e_eof); 
  |  
  |             if (!token_is(token_t::e_rbracket)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR239 - Expected ')' instead of: '" + current_token().value + "'", 
  |                   exprtk_error_location)); 
  |  
  |                details::free_node(node_allocator_, branch); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (!post_bracket_process(token_t::e_lbracket,branch)) 
  |             { 
  |                details::free_node(node_allocator_, branch); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             parse_pending_vector_index_operator(branch); 
  |          } 
  |          else if (token_t::e_lsqrbracket == current_token().type) 
  |          { 
  |             next_token(); 
  |  
  |             if (0 == (branch = parse_expression())) 
  |                return error_node(); 
  |             else if (!token_is(token_t::e_rsqrbracket)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR240 - Expected ']' instead of: '" + current_token().value + "'", 
  |                   exprtk_error_location)); 
  |  
  |                details::free_node(node_allocator_, branch); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (!post_bracket_process(token_t::e_lsqrbracket,branch)) 
  |             { 
  |                details::free_node(node_allocator_, branch); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |          else if (token_t::e_lcrlbracket == current_token().type) 
  |          { 
  |             next_token(); 
  |  
  |             if (0 == (branch = parse_expression())) 
  |                return error_node(); 
  |             else if (!token_is(token_t::e_rcrlbracket)) 
  |             { 
  |                set_error(make_error( 
  |                   parser_error::e_syntax, 
  |                   current_token(), 
  |                   "ERR241 - Expected '}' instead of: '" + current_token().value + "'", 
  |                   exprtk_error_location)); 
  |  
  |                details::free_node(node_allocator_, branch); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (!post_bracket_process(token_t::e_lcrlbracket,branch)) 
  |             { 
  |                details::free_node(node_allocator_, branch); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |          else if (token_t::e_sub == current_token().type) 
  |          { 
  |             next_token(); 
  |             branch = parse_expression(e_level11); 
  |  
  |             if ( 
  |                  branch && 
  |                  !( 
  |                     details::is_neg_unary_node    (branch) && 
  |                     simplify_unary_negation_branch(branch) 
  |                   ) 
  |                ) 
  |             { 
  |                expression_node_ptr result = expression_generator_(details::e_neg,branch); 
  |  
  |                if (0 == result) 
  |                { 
  |                   details::free_node(node_allocator_, branch); 
  |  
  |                   return error_node(); 
  |                } 
  |                else 
  |                   branch = result; 
  |             } 
  |          } 
  |          else if (token_t::e_add == current_token().type) 
  |          { 
  |             next_token(); 
  |             branch = parse_expression(e_level13); 
  |          } 
  |          else if (token_t::e_eof == current_token().type) 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR242 - Premature end of expression[1]", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |          else 
  |          { 
  |             set_error(make_error( 
  |                parser_error::e_syntax, 
  |                current_token(), 
  |                "ERR243 - Premature end of expression[2]", 
  |                exprtk_error_location)); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          if ( 
  |               branch                    && 
  |               (e_level00 == precedence) && 
  |               token_is(token_t::e_ternary,prsrhlpr_t::e_hold) 
  |             ) 
  |          { 
  |             branch = parse_ternary_conditional_statement(branch); 
  |          } 
  |  
  |          parse_pending_string_rangesize(branch); 
  |  
  |          return branch; 
  |       } 
  |  
  |       template <typename Type> 
  |       class expression_generator 
  |       { 
  |       public: 
  |  
  |          typedef details::expression_node<Type>* expression_node_ptr; 
  |          typedef expression_node_ptr (*synthesize_functor_t)(expression_generator<T>&, const details::operator_type& operation, expression_node_ptr (&branch)[2]); 
  |          typedef std::map<std::string,synthesize_functor_t> synthesize_map_t; 
  |          typedef typename exprtk::parser<Type> parser_t; 
  |          typedef const Type& vtype; 
  |          typedef const Type  ctype; 
  |  
  |          inline void init_synthesize_map() 
  |          { 
  |             #ifndef exprtk_disable_enhanced_features 
  |             synthesize_map_["(v)o(v)"] = synthesize_vov_expression::process; 
  |             synthesize_map_["(c)o(v)"] = synthesize_cov_expression::process; 
  |             synthesize_map_["(v)o(c)"] = synthesize_voc_expression::process; 
  |  
  |             #define register_synthezier(S)                      \ 
  |             synthesize_map_[S ::node_type::id()] = S ::process; \ 
  |  
  |             register_synthezier(synthesize_vovov_expression0) 
  |             register_synthezier(synthesize_vovov_expression1) 
  |             register_synthezier(synthesize_vovoc_expression0) 
  |             register_synthezier(synthesize_vovoc_expression1) 
  |             register_synthezier(synthesize_vocov_expression0) 
  |             register_synthezier(synthesize_vocov_expression1) 
  |             register_synthezier(synthesize_covov_expression0) 
  |             register_synthezier(synthesize_covov_expression1) 
  |             register_synthezier(synthesize_covoc_expression0) 
  |             register_synthezier(synthesize_covoc_expression1) 
  |             register_synthezier(synthesize_cocov_expression1) 
  |             register_synthezier(synthesize_vococ_expression0) 
  |  
  |             register_synthezier(synthesize_vovovov_expression0) 
  |             register_synthezier(synthesize_vovovoc_expression0) 
  |             register_synthezier(synthesize_vovocov_expression0) 
  |             register_synthezier(synthesize_vocovov_expression0) 
  |             register_synthezier(synthesize_covovov_expression0) 
  |             register_synthezier(synthesize_covocov_expression0) 
  |             register_synthezier(synthesize_vocovoc_expression0) 
  |             register_synthezier(synthesize_covovoc_expression0) 
  |             register_synthezier(synthesize_vococov_expression0) 
  |  
  |             register_synthezier(synthesize_vovovov_expression1) 
  |             register_synthezier(synthesize_vovovoc_expression1) 
  |             register_synthezier(synthesize_vovocov_expression1) 
  |             register_synthezier(synthesize_vocovov_expression1) 
  |             register_synthezier(synthesize_covovov_expression1) 
  |             register_synthezier(synthesize_covocov_expression1) 
  |             register_synthezier(synthesize_vocovoc_expression1) 
  |             register_synthezier(synthesize_covovoc_expression1) 
  |             register_synthezier(synthesize_vococov_expression1) 
  |  
  |             register_synthezier(synthesize_vovovov_expression2) 
  |             register_synthezier(synthesize_vovovoc_expression2) 
  |             register_synthezier(synthesize_vovocov_expression2) 
  |             register_synthezier(synthesize_vocovov_expression2) 
  |             register_synthezier(synthesize_covovov_expression2) 
  |             register_synthezier(synthesize_covocov_expression2) 
  |             register_synthezier(synthesize_vocovoc_expression2) 
  |             register_synthezier(synthesize_covovoc_expression2) 
  |  
  |             register_synthezier(synthesize_vovovov_expression3) 
  |             register_synthezier(synthesize_vovovoc_expression3) 
  |             register_synthezier(synthesize_vovocov_expression3) 
  |             register_synthezier(synthesize_vocovov_expression3) 
  |             register_synthezier(synthesize_covovov_expression3) 
  |             register_synthezier(synthesize_covocov_expression3) 
  |             register_synthezier(synthesize_vocovoc_expression3) 
  |             register_synthezier(synthesize_covovoc_expression3) 
  |             register_synthezier(synthesize_vococov_expression3) 
  |  
  |             register_synthezier(synthesize_vovovov_expression4) 
  |             register_synthezier(synthesize_vovovoc_expression4) 
  |             register_synthezier(synthesize_vovocov_expression4) 
  |             register_synthezier(synthesize_vocovov_expression4) 
  |             register_synthezier(synthesize_covovov_expression4) 
  |             register_synthezier(synthesize_covocov_expression4) 
  |             register_synthezier(synthesize_vocovoc_expression4) 
  |             register_synthezier(synthesize_covovoc_expression4) 
  |  
  |             #undef register_synthezier 
  |             #endif 
  |          } 
  |  
  |          inline void set_parser(parser_t& p) 
  |          { 
  |             parser_ = &p; 
  |          } 
  |  
  |          inline void set_uom(unary_op_map_t& unary_op_map) 
  |          { 
  |             unary_op_map_ = &unary_op_map; 
  |          } 
  |  
  |          inline void set_bom(binary_op_map_t& binary_op_map) 
  |          { 
  |             binary_op_map_ = &binary_op_map; 
  |          } 
  |  
  |          inline void set_ibom(inv_binary_op_map_t& inv_binary_op_map) 
  |          { 
  |             inv_binary_op_map_ = &inv_binary_op_map; 
  |          } 
  |  
  |          inline void set_sf3m(sf3_map_t& sf3_map) 
  |          { 
  |             sf3_map_ = &sf3_map; 
  |          } 
  |  
  |          inline void set_sf4m(sf4_map_t& sf4_map) 
  |          { 
  |             sf4_map_ = &sf4_map; 
  |          } 
  |  
  |          inline void set_allocator(details::node_allocator& na) 
  |          { 
  |             node_allocator_ = &na; 
  |          } 
  |  
  |          inline void set_strength_reduction_state(const bool enabled) 
  |          { 
  |             strength_reduction_enabled_ = enabled; 
  |          } 
  |  
  |          inline bool strength_reduction_enabled() const 
  |          { 
  |             return strength_reduction_enabled_; 
  |          } 
  |  
  |          inline bool valid_operator(const details::operator_type& operation, binary_functor_t& bop) 
  |          { 
  |             typename binary_op_map_t::iterator bop_itr = binary_op_map_->find(operation); 
  |  
  |             if (binary_op_map_->end() == bop_itr) 
  |                return false; 
  |  
  |             bop = bop_itr->second; 
  |  
  |             return true; 
  |          } 
  |  
  |          inline bool valid_operator(const details::operator_type& operation, unary_functor_t& uop) 
  |          { 
  |             typename unary_op_map_t::iterator uop_itr = unary_op_map_->find(operation); 
  |  
  |             if ((*unary_op_map_).end() == uop_itr) 
  |                return false; 
  |  
  |             uop = uop_itr->second; 
  |  
  |             return true; 
  |          } 
  |  
  |          inline details::operator_type get_operator(const binary_functor_t& bop) const 
  |          { 
  |             return (*inv_binary_op_map_).find(bop)->second; 
  |          } 
  |  
  |          inline expression_node_ptr operator() (const Type& v) const 
  |          { 
  |             return node_allocator_->allocate<literal_node_t>(v); 
  |          } 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          inline expression_node_ptr operator() (const std::string& s) const 
  |          { 
  |             return node_allocator_->allocate<string_literal_node_t>(s); 
  |          } 
  |  
  |          inline expression_node_ptr operator() (std::string& s, range_t& rp) const 
  |          { 
  |             return node_allocator_->allocate_rr<string_range_node_t>(s,rp); 
  |          } 
  |  
  |          inline expression_node_ptr operator() (const std::string& s, range_t& rp) const 
  |          { 
  |             return node_allocator_->allocate_tt<const_string_range_node_t>(s,rp); 
  |          } 
  |  
  |          inline expression_node_ptr operator() (expression_node_ptr branch, range_t& rp) const 
  |          { 
  |             if (is_generally_string_node(branch)) 
  |                return node_allocator_->allocate_tt<generic_string_range_node_t>(branch,rp); 
  |             else 
  |                return error_node(); 
  |          } 
  |          #endif 
  |  
  |          inline bool unary_optimisable(const details::operator_type& operation) const 
  |          { 
  |             return (details::e_abs   == operation) || (details::e_acos  == operation) || 
  |                    (details::e_acosh == operation) || (details::e_asin  == operation) || 
  |                    (details::e_asinh == operation) || (details::e_atan  == operation) || 
  |                    (details::e_atanh == operation) || (details::e_ceil  == operation) || 
  |                    (details::e_cos   == operation) || (details::e_cosh  == operation) || 
  |                    (details::e_exp   == operation) || (details::e_expm1 == operation) || 
  |                    (details::e_floor == operation) || (details::e_log   == operation) || 
  |                    (details::e_log10 == operation) || (details::e_log2  == operation) || 
  |                    (details::e_log1p == operation) || (details::e_neg   == operation) || 
  |                    (details::e_pos   == operation) || (details::e_round == operation) || 
  |                    (details::e_sin   == operation) || (details::e_sinc  == operation) || 
  |                    (details::e_sinh  == operation) || (details::e_sqrt  == operation) || 
  |                    (details::e_tan   == operation) || (details::e_tanh  == operation) || 
  |                    (details::e_cot   == operation) || (details::e_sec   == operation) || 
  |                    (details::e_csc   == operation) || (details::e_r2d   == operation) || 
  |                    (details::e_d2r   == operation) || (details::e_d2g   == operation) || 
  |                    (details::e_g2d   == operation) || (details::e_notl  == operation) || 
  |                    (details::e_sgn   == operation) || (details::e_erf   == operation) || 
  |                    (details::e_erfc  == operation) || (details::e_ncdf  == operation) || 
  |                    (details::e_frac  == operation) || (details::e_trunc == operation) ; 
  |          } 
  |  
  |          inline bool sf3_optimisable(const std::string& sf3id, trinary_functor_t& tfunc) const 
  |          { 
  |             typename sf3_map_t::const_iterator itr = sf3_map_->find(sf3id); 
  |  
  |             if (sf3_map_->end() == itr) 
  |                return false; 
  |             else 
  |                tfunc = itr->second.first; 
  |  
  |             return true; 
  |          } 
  |  
  |          inline bool sf4_optimisable(const std::string& sf4id, quaternary_functor_t& qfunc) const 
  |          { 
  |             typename sf4_map_t::const_iterator itr = sf4_map_->find(sf4id); 
  |  
  |             if (sf4_map_->end() == itr) 
  |                return false; 
  |             else 
  |                qfunc = itr->second.first; 
  |  
  |             return true; 
  |          } 
  |  
  |          inline bool sf3_optimisable(const std::string& sf3id, details::operator_type& operation) const 
  |          { 
  |             typename sf3_map_t::const_iterator itr = sf3_map_->find(sf3id); 
  |  
  |             if (sf3_map_->end() == itr) 
  |                return false; 
  |             else 
  |                operation = itr->second.second; 
  |  
  |             return true; 
  |          } 
  |  
  |          inline bool sf4_optimisable(const std::string& sf4id, details::operator_type& operation) const 
  |          { 
  |             typename sf4_map_t::const_iterator itr = sf4_map_->find(sf4id); 
  |  
  |             if (sf4_map_->end() == itr) 
  |                return false; 
  |             else 
  |                operation = itr->second.second; 
  |  
  |             return true; 
  |          } 
  |  
  |          inline expression_node_ptr operator() (const details::operator_type& operation, expression_node_ptr (&branch)[1]) 
  |          { 
  |             if (0 == branch[0]) 
  |             { 
  |                return error_node(); 
  |             } 
  |             else if (details::is_null_node(branch[0])) 
  |             { 
  |                return branch[0]; 
  |             } 
  |             else if (details::is_break_node(branch[0])) 
  |             { 
  |                return error_node(); 
  |             } 
  |             else if (details::is_continue_node(branch[0])) 
  |             { 
  |                return error_node(); 
  |             } 
  |             else if (details::is_constant_node(branch[0])) 
  |             { 
  |                return synthesize_expression<unary_node_t,1>(operation,branch); 
  |             } 
  |             else if (unary_optimisable(operation) && details::is_variable_node(branch[0])) 
  |             { 
  |                return synthesize_uv_expression(operation,branch); 
  |             } 
  |             else if (unary_optimisable(operation) && details::is_ivector_node(branch[0])) 
  |             { 
  |                return synthesize_uvec_expression(operation,branch); 
  |             } 
  |             else 
  |                return synthesize_unary_expression(operation,branch); 
  |          } 
  |  
  |          inline bool is_assignment_operation(const details::operator_type& operation) const 
  |          { 
  |             return ( 
  |                      (details::e_addass == operation) || 
  |                      (details::e_subass == operation) || 
  |                      (details::e_mulass == operation) || 
  |                      (details::e_divass == operation) || 
  |                      (details::e_modass == operation) 
  |                    ) && 
  |                    parser_->settings_.assignment_enabled(operation); 
  |          } 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          inline bool valid_string_operation(const details::operator_type& operation) const 
  |          { 
  |             return (details::e_add    == operation) || 
  |                    (details::e_lt     == operation) || 
  |                    (details::e_lte    == operation) || 
  |                    (details::e_gt     == operation) || 
  |                    (details::e_gte    == operation) || 
  |                    (details::e_eq     == operation) || 
  |                    (details::e_ne     == operation) || 
  |                    (details::e_in     == operation) || 
  |                    (details::e_like   == operation) || 
  |                    (details::e_ilike  == operation) || 
  |                    (details::e_assign == operation) || 
  |                    (details::e_addass == operation) || 
  |                    (details::e_swap   == operation) ; 
  |          } 
  |          #else 
  |          inline bool valid_string_operation(const details::operator_type&) const 
  |          { 
  |             return false; 
  |          } 
  |          #endif 
  |  
  |          inline std::string to_str(const details::operator_type& operation) const 
  |          { 
  |             switch (operation) 
  |             { 
  |                case details::e_add  : return "+"      ; 
  |                case details::e_sub  : return "-"      ; 
  |                case details::e_mul  : return "*"      ; 
  |                case details::e_div  : return "/"      ; 
  |                case details::e_mod  : return "%"      ; 
  |                case details::e_pow  : return "^"      ; 
  |                case details::e_lt   : return "<"      ; 
  |                case details::e_lte  : return "<="     ; 
  |                case details::e_gt   : return ">"      ; 
  |                case details::e_gte  : return ">="     ; 
  |                case details::e_eq   : return "=="     ; 
  |                case details::e_ne   : return "!="     ; 
  |                case details::e_and  : return "and"    ; 
  |                case details::e_nand : return "nand"   ; 
  |                case details::e_or   : return "or"     ; 
  |                case details::e_nor  : return "nor"    ; 
  |                case details::e_xor  : return "xor"    ; 
  |                case details::e_xnor : return "xnor"   ; 
  |                default              : return "UNKNOWN" 
  |             } 
  |          } 
  |  
  |          inline bool operation_optimisable(const details::operator_type& operation) const 
  |          { 
  |             return (details::e_add  == operation) || 
  |                    (details::e_sub  == operation) || 
  |                    (details::e_mul  == operation) || 
  |                    (details::e_div  == operation) || 
  |                    (details::e_mod  == operation) || 
  |                    (details::e_pow  == operation) || 
  |                    (details::e_lt   == operation) || 
  |                    (details::e_lte  == operation) || 
  |                    (details::e_gt   == operation) || 
  |                    (details::e_gte  == operation) || 
  |                    (details::e_eq   == operation) || 
  |                    (details::e_ne   == operation) || 
  |                    (details::e_and  == operation) || 
  |                    (details::e_nand == operation) || 
  |                    (details::e_or   == operation) || 
  |                    (details::e_nor  == operation) || 
  |                    (details::e_xor  == operation) || 
  |                    (details::e_xnor == operation) ; 
  |          } 
  |  
  |          inline std::string branch_to_id(expression_node_ptr branch) const 
  |          { 
  |             static const std::string null_str   ("(null)" ); 
  |             static const std::string const_str  ("(c)"    ); 
  |             static const std::string var_str    ("(v)"    ); 
  |             static const std::string vov_str    ("(vov)"  ); 
  |             static const std::string cov_str    ("(cov)"  ); 
  |             static const std::string voc_str    ("(voc)"  ); 
  |             static const std::string str_str    ("(s)"    ); 
  |             static const std::string strrng_str ("(rngs)" ); 
  |             static const std::string cs_str     ("(cs)"   ); 
  |             static const std::string cstrrng_str("(crngs)"); 
  |  
  |             if (details::is_null_node(branch)) 
  |                return null_str; 
  |             else if (details::is_constant_node(branch)) 
  |                return const_str; 
  |             else if (details::is_variable_node(branch)) 
  |                return var_str; 
  |             else if (details::is_vov_node(branch)) 
  |                return vov_str; 
  |             else if (details::is_cov_node(branch)) 
  |                return cov_str; 
  |             else if (details::is_voc_node(branch)) 
  |                return voc_str; 
  |             else if (details::is_string_node(branch)) 
  |                return str_str; 
  |             else if (details::is_const_string_node(branch)) 
  |                return cs_str; 
  |             else if (details::is_string_range_node(branch)) 
  |                return strrng_str; 
  |             else if (details::is_const_string_range_node(branch)) 
  |                return cstrrng_str; 
  |             else if (details::is_t0ot1ot2_node(branch)) 
  |                return "(" + dynamic_cast<details::T0oT1oT2_base_node<T>*>(branch)->type_id() + ")" 
  |             else if (details::is_t0ot1ot2ot3_node(branch)) 
  |                return "(" + dynamic_cast<details::T0oT1oT2oT3_base_node<T>*>(branch)->type_id() + ")" 
  |             else 
  |                return "ERROR" 
  |          } 
  |  
  |          inline std::string branch_to_id(expression_node_ptr (&branch)[2]) const 
  |          { 
  |             return branch_to_id(branch[0]) + std::string("o") + branch_to_id(branch[1]); 
  |          } 
  |  
  |          inline bool cov_optimisable(const details::operator_type& operation, expression_node_ptr (&branch)[2]) const 
  |          { 
  |             if (!operation_optimisable(operation)) 
  |                return false; 
  |             else 
  |                return details::is_constant_node(branch[0]) && 
  |                       details::is_variable_node(branch[1]) ; 
  |          } 
  |  
  |          inline bool voc_optimisable(const details::operator_type& operation, expression_node_ptr (&branch)[2]) const 
  |          { 
  |             if (!operation_optimisable(operation)) 
  |                return false; 
  |             else 
  |                return details::is_variable_node(branch[0]) && 
  |                       details::is_constant_node(branch[1]) ; 
  |          } 
  |  
  |          inline bool vov_optimisable(const details::operator_type& operation, expression_node_ptr (&branch)[2]) const 
  |          { 
  |             if (!operation_optimisable(operation)) 
  |                return false; 
  |             else 
  |                return details::is_variable_node(branch[0]) && 
  |                       details::is_variable_node(branch[1]) ; 
  |          } 
  |  
  |          inline bool cob_optimisable(const details::operator_type& operation, expression_node_ptr (&branch)[2]) const 
  |          { 
  |             if (!operation_optimisable(operation)) 
  |                return false; 
  |             else 
  |                return details::is_constant_node(branch[0]) && 
  |                      !details::is_constant_node(branch[1]) ; 
  |          } 
  |  
  |          inline bool boc_optimisable(const details::operator_type& operation, expression_node_ptr (&branch)[2]) const 
  |          { 
  |             if (!operation_optimisable(operation)) 
  |                return false; 
  |             else 
  |                return !details::is_constant_node(branch[0]) && 
  |                        details::is_constant_node(branch[1]) ; 
  |          } 
  |  
  |          inline bool cocob_optimisable(const details::operator_type& operation, expression_node_ptr (&branch)[2]) const 
  |          { 
  |             if ( 
  |                  (details::e_add == operation) || 
  |                  (details::e_sub == operation) || 
  |                  (details::e_mul == operation) || 
  |                  (details::e_div == operation) 
  |                ) 
  |             { 
  |                return (details::is_constant_node(branch[0]) && details::is_cob_node(branch[1])) || 
  |                       (details::is_constant_node(branch[1]) && details::is_cob_node(branch[0])) ; 
  |             } 
  |             else 
  |                return false; 
  |          } 
  |  
  |          inline bool coboc_optimisable(const details::operator_type& operation, expression_node_ptr (&branch)[2]) const 
  |          { 
  |             if ( 
  |                  (details::e_add == operation) || 
  |                  (details::e_sub == operation) || 
  |                  (details::e_mul == operation) || 
  |                  (details::e_div == operation) 
  |                ) 
  |             { 
  |                return (details::is_constant_node(branch[0]) && details::is_boc_node(branch[1])) || 
  |                       (details::is_constant_node(branch[1]) && details::is_boc_node(branch[0])) ; 
  |             } 
  |             else 
  |                return false; 
  |          } 
  |  
  |          inline bool uvouv_optimisable(const details::operator_type& operation, expression_node_ptr (&branch)[2]) const 
  |          { 
  |             if (!operation_optimisable(operation)) 
  |                return false; 
  |             else 
  |                return details::is_uv_node(branch[0]) && 
  |                       details::is_uv_node(branch[1]) ; 
  |          } 
  |  
  |          inline bool vob_optimisable(const details::operator_type& operation, expression_node_ptr (&branch)[2]) const 
  |          { 
  |             if (!operation_optimisable(operation)) 
  |                return false; 
  |             else 
  |                return details::is_variable_node(branch[0]) && 
  |                      !details::is_variable_node(branch[1]) ; 
  |          } 
  |  
  |          inline bool bov_optimisable(const details::operator_type& operation, expression_node_ptr (&branch)[2]) const 
  |          { 
  |             if (!operation_optimisable(operation)) 
  |                return false; 
  |             else 
  |                return !details::is_variable_node(branch[0]) && 
  |                        details::is_variable_node(branch[1]) ; 
  |          } 
  |  
  |          inline bool binext_optimisable(const details::operator_type& operation, expression_node_ptr (&branch)[2]) const 
  |          { 
  |             if (!operation_optimisable(operation)) 
  |                return false; 
  |             else 
  |                return !details::is_constant_node(branch[0]) || 
  |                       !details::is_constant_node(branch[1]) ; 
  |          } 
  |  
  |          inline bool is_invalid_assignment_op(const details::operator_type& operation, expression_node_ptr (&branch)[2]) const 
  |          { 
  |             if (is_assignment_operation(operation)) 
  |             { 
  |                const bool b1_is_genstring = details::is_generally_string_node(branch[1]); 
  |  
  |                if (details::is_string_node(branch[0])) 
  |                   return !b1_is_genstring; 
  |                else if (details::is_literal_node(branch[0])) 
  |                   return true; 
  |                else 
  |                   return ( 
  |                            !details::is_variable_node              (branch[0]) && 
  |                            !details::is_vector_elem_node           (branch[0]) && 
  |                            !details::is_vector_celem_node          (branch[0]) && 
  |                            !details::is_vector_elem_rtc_node       (branch[0]) && 
  |                            !details::is_vector_celem_rtc_node      (branch[0]) && 
  |                            !details::is_rebasevector_elem_node     (branch[0]) && 
  |                            !details::is_rebasevector_celem_node    (branch[0]) && 
  |                            !details::is_rebasevector_elem_rtc_node (branch[0]) && 
  |                            !details::is_rebasevector_celem_rtc_node(branch[0]) && 
  |                            !details::is_vector_node                (branch[0]) 
  |                          ) 
  |                          || b1_is_genstring; 
  |             } 
  |             else 
  |                return false; 
  |          } 
  |  
  |          inline bool is_constpow_operation(const details::operator_type& operation, expression_node_ptr(&branch)[2]) const 
  |          { 
  |             if ( 
  |                  !details::is_constant_node(branch[1]) || 
  |                   details::is_constant_node(branch[0]) || 
  |                   details::is_variable_node(branch[0]) || 
  |                   details::is_vector_node  (branch[0]) || 
  |                   details::is_generally_string_node(branch[0]) 
  |                ) 
  |                return false; 
  |  
  |             const Type c = static_cast<details::literal_node<Type>*>(branch[1])->value(); 
  |  
  |             return cardinal_pow_optimisable(operation, c); 
  |          } 
  |  
  |          inline bool is_invalid_break_continue_op(expression_node_ptr (&branch)[2]) const 
  |          { 
  |             return ( 
  |                      details::is_break_node   (branch[0]) || 
  |                      details::is_break_node   (branch[1]) || 
  |                      details::is_continue_node(branch[0]) || 
  |                      details::is_continue_node(branch[1]) 
  |                    ); 
  |          } 
  |  
  |          inline bool is_invalid_string_op(const details::operator_type& operation, expression_node_ptr (&branch)[2]) const 
  |          { 
  |             const bool b0_string = is_generally_string_node(branch[0]); 
  |             const bool b1_string = is_generally_string_node(branch[1]); 
  |  
  |             bool result = false; 
  |  
  |             if (b0_string != b1_string) 
  |                result = true; 
  |             else if (!valid_string_operation(operation) && b0_string && b1_string) 
  |                result = true; 
  |  
  |             if (result) 
  |             { 
  |                parser_->set_synthesis_error("Invalid string operation"); 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          inline bool is_invalid_string_op(const details::operator_type& operation, expression_node_ptr (&branch)[3]) const 
  |          { 
  |             const bool b0_string = is_generally_string_node(branch[0]); 
  |             const bool b1_string = is_generally_string_node(branch[1]); 
  |             const bool b2_string = is_generally_string_node(branch[2]); 
  |  
  |             bool result = false; 
  |  
  |             if ((b0_string != b1_string) || (b1_string != b2_string)) 
  |                result = true; 
  |             else if ((details::e_inrange != operation) && b0_string && b1_string && b2_string) 
  |                result = true; 
  |  
  |             if (result) 
  |             { 
  |                parser_->set_synthesis_error("Invalid string operation"); 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          inline bool is_string_operation(const details::operator_type& operation, expression_node_ptr (&branch)[2]) const 
  |          { 
  |             const bool b0_string = is_generally_string_node(branch[0]); 
  |             const bool b1_string = is_generally_string_node(branch[1]); 
  |  
  |             return (b0_string && b1_string && valid_string_operation(operation)); 
  |          } 
  |  
  |          inline bool is_string_operation(const details::operator_type& operation, expression_node_ptr (&branch)[3]) const 
  |          { 
  |             const bool b0_string = is_generally_string_node(branch[0]); 
  |             const bool b1_string = is_generally_string_node(branch[1]); 
  |             const bool b2_string = is_generally_string_node(branch[2]); 
  |  
  |             return (b0_string && b1_string && b2_string && (details::e_inrange == operation)); 
  |          } 
  |  
  |          #ifndef exprtk_disable_sc_andor 
  |          inline bool is_shortcircuit_expression(const details::operator_type& operation) const 
  |          { 
  |             return ( 
  |                      (details::e_scand == operation) || 
  |                      (details::e_scor  == operation) 
  |                    ); 
  |          } 
  |          #else 
  |          inline bool is_shortcircuit_expression(const details::operator_type&) const 
  |          { 
  |             return false; 
  |          } 
  |          #endif 
  |  
  |          inline bool is_null_present(expression_node_ptr (&branch)[2]) const 
  |          { 
  |             return ( 
  |                      details::is_null_node(branch[0]) || 
  |                      details::is_null_node(branch[1]) 
  |                    ); 
  |          } 
  |  
  |          inline bool is_vector_eqineq_logic_operation(const details::operator_type& operation, expression_node_ptr (&branch)[2]) const 
  |          { 
  |             if (!is_ivector_node(branch[0]) && !is_ivector_node(branch[1])) 
  |                return false; 
  |             else 
  |                return ( 
  |                         (details::e_lt    == operation) || 
  |                         (details::e_lte   == operation) || 
  |                         (details::e_gt    == operation) || 
  |                         (details::e_gte   == operation) || 
  |                         (details::e_eq    == operation) || 
  |                         (details::e_ne    == operation) || 
  |                         (details::e_equal == operation) || 
  |                         (details::e_and   == operation) || 
  |                         (details::e_nand  == operation) || 
  |                         (details::e_or    == operation) || 
  |                         (details::e_nor   == operation) || 
  |                         (details::e_xor   == operation) || 
  |                         (details::e_xnor  == operation) 
  |                       ); 
  |          } 
  |  
  |          inline bool is_vector_arithmetic_operation(const details::operator_type& operation, expression_node_ptr (&branch)[2]) const 
  |          { 
  |             if (!is_ivector_node(branch[0]) && !is_ivector_node(branch[1])) 
  |                return false; 
  |             else 
  |                return ( 
  |                         (details::e_add == operation) || 
  |                         (details::e_sub == operation) || 
  |                         (details::e_mul == operation) || 
  |                         (details::e_div == operation) || 
  |                         (details::e_pow == operation) 
  |                       ); 
  |          } 
  |  
  |          inline expression_node_ptr operator() (const details::operator_type& operation, expression_node_ptr (&branch)[2]) 
  |          { 
  |             if ((0 == branch[0]) || (0 == branch[1])) 
  |             { 
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_syntax, 
  |                   parser_->current_state().token, 
  |                   "ERR244 - Invalid branches received for operator '" + details::to_str(operation) + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (is_invalid_string_op(operation,branch)) 
  |             { 
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_syntax, 
  |                   parser_->current_state().token, 
  |                   "ERR245 - Invalid branch pair for string operator '" + details::to_str(operation) + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (is_invalid_assignment_op(operation,branch)) 
  |             { 
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_syntax, 
  |                   parser_->current_state().token, 
  |                   "ERR246 - Invalid branch pair for assignment operator '" + details::to_str(operation) + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (is_invalid_break_continue_op(branch)) 
  |             { 
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_syntax, 
  |                   parser_->current_state().token, 
  |                   "ERR247 - Invalid branch pair for break/continue operator '" + details::to_str(operation) + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (details::e_assign == operation) 
  |             { 
  |                return synthesize_assignment_expression(operation, branch); 
  |             } 
  |             else if (details::e_swap == operation) 
  |             { 
  |                return synthesize_swap_expression(branch); 
  |             } 
  |             else if (is_assignment_operation(operation)) 
  |             { 
  |                return synthesize_assignment_operation_expression(operation, branch); 
  |             } 
  |             else if (is_vector_eqineq_logic_operation(operation, branch)) 
  |             { 
  |                return synthesize_veceqineqlogic_operation_expression(operation, branch); 
  |             } 
  |             else if (is_vector_arithmetic_operation(operation, branch)) 
  |             { 
  |                return synthesize_vecarithmetic_operation_expression(operation, branch); 
  |             } 
  |             else if (is_shortcircuit_expression(operation)) 
  |             { 
  |                return synthesize_shortcircuit_expression(operation, branch); 
  |             } 
  |             else if (is_string_operation(operation, branch)) 
  |             { 
  |                return synthesize_string_expression(operation, branch); 
  |             } 
  |             else if (is_null_present(branch)) 
  |             { 
  |                return synthesize_null_expression(operation, branch); 
  |             } 
  |             #ifndef exprtk_disable_cardinal_pow_optimisation 
  |             else if (is_constpow_operation(operation, branch)) 
  |             { 
  |                return cardinal_pow_optimisation(branch); 
  |             } 
  |             #endif 
  |  
  |             expression_node_ptr result = error_node(); 
  |  
  |             #ifndef exprtk_disable_enhanced_features 
  |             if (synthesize_expression(operation, branch, result)) 
  |             { 
  |                return result; 
  |             } 
  |             else 
  |             #endif 
  |  
  |             { 
  |                /* 
  |                   Possible reductions: 
  |                   1. c o cob -> cob 
  |                   2. cob o c -> cob 
  |                   3. c o boc -> boc 
  |                   4. boc o c -> boc 
  |                */ 
  |                result = error_node(); 
  |  
  |                if (cocob_optimisable(operation, branch)) 
  |                { 
  |                   result = synthesize_cocob_expression::process((*this), operation, branch); 
  |                } 
  |                else if (coboc_optimisable(operation, branch) && (0 == result)) 
  |                { 
  |                   result = synthesize_coboc_expression::process((*this), operation, branch); 
  |                } 
  |  
  |                if (result) 
  |                   return result; 
  |             } 
  |  
  |             if (uvouv_optimisable(operation, branch)) 
  |             { 
  |                return synthesize_uvouv_expression(operation, branch); 
  |             } 
  |             else if (vob_optimisable(operation, branch)) 
  |             { 
  |                return synthesize_vob_expression::process((*this), operation, branch); 
  |             } 
  |             else if (bov_optimisable(operation, branch)) 
  |             { 
  |                return synthesize_bov_expression::process((*this), operation, branch); 
  |             } 
  |             else if (cob_optimisable(operation, branch)) 
  |             { 
  |                return synthesize_cob_expression::process((*this), operation, branch); 
  |             } 
  |             else if (boc_optimisable(operation, branch)) 
  |             { 
  |                return synthesize_boc_expression::process((*this), operation, branch); 
  |             } 
  |             #ifndef exprtk_disable_enhanced_features 
  |             else if (cov_optimisable(operation, branch)) 
  |             { 
  |                return synthesize_cov_expression::process((*this), operation, branch); 
  |             } 
  |             #endif 
  |             else if (binext_optimisable(operation, branch)) 
  |             { 
  |                return synthesize_binary_ext_expression::process((*this), operation, branch); 
  |             } 
  |             else 
  |                return synthesize_expression<binary_node_t,2>(operation, branch); 
  |          } 
  |  
  |          inline expression_node_ptr operator() (const details::operator_type& operation, expression_node_ptr (&branch)[3]) 
  |          { 
  |             if ( 
  |                  (0 == branch[0]) || 
  |                  (0 == branch[1]) || 
  |                  (0 == branch[2]) 
  |                ) 
  |             { 
  |                details::free_all_nodes(*node_allocator_,branch); 
  |  
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_syntax, 
  |                   parser_->current_state().token, 
  |                   "ERR248 - Invalid branches operator '" + details::to_str(operation) + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (is_invalid_string_op(operation, branch)) 
  |             { 
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_syntax, 
  |                   parser_->current_state().token, 
  |                   "ERR249 - Invalid branches for string operator '" + details::to_str(operation) + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (is_string_operation(operation, branch)) 
  |             { 
  |                return synthesize_string_expression(operation, branch); 
  |             } 
  |             else 
  |                return synthesize_expression<trinary_node_t,3>(operation, branch); 
  |          } 
  |  
  |          inline expression_node_ptr operator() (const details::operator_type& operation, expression_node_ptr (&branch)[4]) 
  |          { 
  |             return synthesize_expression<quaternary_node_t,4>(operation,branch); 
  |          } 
  |  
  |          inline expression_node_ptr operator() (const details::operator_type& operation, expression_node_ptr b0) 
  |          { 
  |             expression_node_ptr branch[1] = { b0 }; 
  |             return (*this)(operation,branch); 
  |          } 
  |  
  |          inline expression_node_ptr operator() (const details::operator_type& operation, expression_node_ptr& b0, expression_node_ptr& b1) 
  |          { 
  |             expression_node_ptr result = error_node(); 
  |  
  |             if ((0 != b0) && (0 != b1)) 
  |             { 
  |                expression_node_ptr branch[2] = { b0, b1 }; 
  |                result = expression_generator<Type>::operator()(operation, branch); 
  |                b0 = branch[0]; 
  |                b1 = branch[1]; 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          inline expression_node_ptr conditional(expression_node_ptr condition, 
  |                                                 expression_node_ptr consequent, 
  |                                                 expression_node_ptr alternative) const 
  |          { 
  |             if ((0 == condition) || (0 == consequent)) 
  |             { 
  |                details::free_node(*node_allocator_, condition  ); 
  |                details::free_node(*node_allocator_, consequent ); 
  |                details::free_node(*node_allocator_, alternative); 
  |  
  |                const std::string invalid_branches = 
  |                                  ((0 == condition ) ? std::string("condition ") : "") + 
  |                                  ((0 == consequent) ? std::string("consequent") : "") ; 
  |  
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_parser, 
  |                   parser_->current_state().token, 
  |                   "ERR250 - Invalid " + invalid_branches + " for conditional statement", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             // Can the condition be immediately evaluated? if so optimise. 
  |             else if (details::is_constant_node(condition)) 
  |             { 
  |                // True branch 
  |                if (details::is_true(condition)) 
  |                { 
  |                   details::free_node(*node_allocator_, condition  ); 
  |                   details::free_node(*node_allocator_, alternative); 
  |  
  |                   return consequent; 
  |                } 
  |                // False branch 
  |                else 
  |                { 
  |                   details::free_node(*node_allocator_, condition ); 
  |                   details::free_node(*node_allocator_, consequent); 
  |  
  |                   if (alternative) 
  |                      return alternative; 
  |                   else 
  |                      return node_allocator_->allocate<details::null_node<T> >(); 
  |                } 
  |             } 
  |  
  |             expression_node_ptr result = error_node(); 
  |             std::string node_name      = "Unknown!" 
  |  
  |             if ((0 != consequent) && (0 != alternative)) 
  |             { 
  |                result = node_allocator_->allocate<conditional_node_t>(condition, consequent, alternative); 
  |                node_name = "conditional_node_t" 
  |             } 
  |             else 
  |             { 
  |                result = node_allocator_->allocate<cons_conditional_node_t>(condition, consequent); 
  |                node_name = "cons_conditional_node_t" 
  |             } 
  |  
  |             if (result && result->valid()) 
  |             { 
  |                return result; 
  |             } 
  |  
  |             parser_->set_error(parser_error::make_error( 
  |                parser_error::e_parser, 
  |                token_t(), 
  |                "ERR251 - Failed to synthesize node: " + node_name, 
  |                exprtk_error_location)); 
  |  
  |             details::free_node(*node_allocator_, result); 
  |             return error_node(); 
  |          } 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          inline expression_node_ptr conditional_string(expression_node_ptr condition, 
  |                                                        expression_node_ptr consequent, 
  |                                                        expression_node_ptr alternative) const 
  |          { 
  |             if ((0 == condition) || (0 == consequent)) 
  |             { 
  |                details::free_node(*node_allocator_, condition  ); 
  |                details::free_node(*node_allocator_, consequent ); 
  |                details::free_node(*node_allocator_, alternative); 
  |  
  |                const std::string invalid_branches = 
  |                                  ((0 == condition ) ? std::string("condition ") : "") + 
  |                                  ((0 == consequent) ? std::string("consequent") : "") ; 
  |  
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_parser, 
  |                   parser_->current_state().token, 
  |                   "ERR252 - Invalid " + invalid_branches + " for string conditional statement", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             // Can the condition be immediately evaluated? if so optimise. 
  |             else if (details::is_constant_node(condition)) 
  |             { 
  |                // True branch 
  |                if (details::is_true(condition)) 
  |                { 
  |                   details::free_node(*node_allocator_, condition  ); 
  |                   details::free_node(*node_allocator_, alternative); 
  |  
  |                   return consequent; 
  |                } 
  |                // False branch 
  |                else 
  |                { 
  |                   details::free_node(*node_allocator_, condition ); 
  |                   details::free_node(*node_allocator_, consequent); 
  |  
  |                   if (alternative) 
  |                      return alternative; 
  |                   else 
  |                      return node_allocator_-> 
  |                               allocate_c<details::string_literal_node<Type> >(""); 
  |                } 
  |             } 
  |             else if ((0 != consequent) && (0 != alternative)) 
  |             { 
  |                expression_node_ptr result = 
  |                   node_allocator_->allocate<conditional_string_node_t>(condition, consequent, alternative); 
  |  
  |                if (result && result->valid()) 
  |                { 
  |                   return result; 
  |                } 
  |  
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_parser, 
  |                   token_t(), 
  |                   "ERR253 - Failed to synthesize node: conditional_string_node_t", 
  |                   exprtk_error_location)); 
  |  
  |                details::free_node(*node_allocator_, result); 
  |             } 
  |  
  |             return error_node(); 
  |          } 
  |          #else 
  |          inline expression_node_ptr conditional_string(expression_node_ptr, 
  |                                                        expression_node_ptr, 
  |                                                        expression_node_ptr) const 
  |          { 
  |             return error_node(); 
  |          } 
  |          #endif 
  |  
  |          inline expression_node_ptr conditional_vector(expression_node_ptr condition, 
  |                                                        expression_node_ptr consequent, 
  |                                                        expression_node_ptr alternative) const 
  |          { 
  |             if ((0 == condition) || (0 == consequent)) 
  |             { 
  |                details::free_node(*node_allocator_, condition  ); 
  |                details::free_node(*node_allocator_, consequent ); 
  |                details::free_node(*node_allocator_, alternative); 
  |  
  |                const std::string invalid_branches = 
  |                                  ((0 == condition ) ? std::string("condition ") : "") + 
  |                                  ((0 == consequent) ? std::string("consequent") : "") ; 
  |  
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_parser, 
  |                   parser_->current_state().token, 
  |                   "ERR254 - Invalid " + invalid_branches + " for vector conditional statement", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             // Can the condition be immediately evaluated? if so optimise. 
  |             else if (details::is_constant_node(condition)) 
  |             { 
  |                // True branch 
  |                if (details::is_true(condition)) 
  |                { 
  |                   details::free_node(*node_allocator_, condition  ); 
  |                   details::free_node(*node_allocator_, alternative); 
  |  
  |                   return consequent; 
  |                } 
  |                // False branch 
  |                else 
  |                { 
  |                   details::free_node(*node_allocator_, condition ); 
  |                   details::free_node(*node_allocator_, consequent); 
  |  
  |                   if (alternative) 
  |                      return alternative; 
  |                   else 
  |                      return node_allocator_->allocate<details::null_node<T> >(); 
  |  
  |                } 
  |             } 
  |             else if ((0 != consequent) && (0 != alternative)) 
  |             { 
  |                return node_allocator_-> 
  |                         allocate<conditional_vector_node_t>(condition, consequent, alternative); 
  |             } 
  |             else 
  |                return error_node(); 
  |          } 
  |  
  |          inline loop_runtime_check_ptr get_loop_runtime_check(const loop_runtime_check::loop_types loop_type) const 
  |          { 
  |             if ( 
  |                  parser_->loop_runtime_check_ && 
  |                  (loop_type == (parser_->loop_runtime_check_->loop_set & loop_type)) 
  |                ) 
  |             { 
  |                return parser_->loop_runtime_check_; 
  |             } 
  |  
  |             return loop_runtime_check_ptr(0); 
  |          } 
  |  
  |          inline vector_access_runtime_check_ptr get_vector_access_runtime_check() const 
  |          { 
  |             return parser_->vector_access_runtime_check_; 
  |          } 
  |  
  |          inline expression_node_ptr while_loop(expression_node_ptr& condition, 
  |                                                expression_node_ptr& branch, 
  |                                                const bool break_continue_present = false) const 
  |          { 
  |             if ( 
  |                  !break_continue_present              && 
  |                  !parser_->state_.return_stmt_present && 
  |                  details::is_constant_node(condition) 
  |                ) 
  |             { 
  |                expression_node_ptr result = error_node(); 
  |                if (details::is_true(condition)) 
  |                { 
  |                   // Infinite loops are not allowed. 
  |  
  |                   parser_->set_error(parser_error::make_error( 
  |                      parser_error::e_parser, 
  |                      parser_->current_state().token, 
  |                      "ERR255 - Infinite loop condition without 'break' or 'return' not allowed in while-loops", 
  |                      exprtk_error_location)); 
  |  
  |                   result = error_node(); 
  |                } 
  |                else 
  |                   result = node_allocator_->allocate<details::null_node<Type> >(); 
  |  
  |                details::free_node(*node_allocator_, condition); 
  |                details::free_node(*node_allocator_, branch   ); 
  |  
  |                return result; 
  |             } 
  |             else if (details::is_null_node(condition)) 
  |             { 
  |                details::free_node(*node_allocator_,condition); 
  |  
  |                return branch; 
  |             } 
  |  
  |             loop_runtime_check_ptr rtc = get_loop_runtime_check(loop_runtime_check::e_while_loop); 
  |  
  |             if (!break_continue_present) 
  |             { 
  |                if (rtc) 
  |                   return node_allocator_->allocate<while_loop_rtc_node_t> 
  |                            (condition, branch,  rtc); 
  |                else 
  |                   return node_allocator_->allocate<while_loop_node_t> 
  |                            (condition, branch); 
  |             } 
  |             #ifndef exprtk_disable_break_continue 
  |             else 
  |             { 
  |                if (rtc) 
  |                   return node_allocator_->allocate<while_loop_bc_rtc_node_t> 
  |                            (condition, branch, rtc); 
  |                else 
  |                   return node_allocator_->allocate<while_loop_bc_node_t> 
  |                            (condition, branch); 
  |             } 
  |             #else 
  |                return error_node(); 
  |             #endif 
  |          } 
  |  
  |          inline expression_node_ptr repeat_until_loop(expression_node_ptr& condition, 
  |                                                       expression_node_ptr& branch, 
  |                                                       const bool break_continue_present = false) const 
  |          { 
  |             if (!break_continue_present && details::is_constant_node(condition)) 
  |             { 
  |                if ( 
  |                     details::is_true(condition) && 
  |                     details::is_constant_node(branch) 
  |                   ) 
  |                { 
  |                   free_node(*node_allocator_,condition); 
  |  
  |                   return branch; 
  |                } 
  |  
  |                details::free_node(*node_allocator_, condition); 
  |                details::free_node(*node_allocator_, branch   ); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (details::is_null_node(condition)) 
  |             { 
  |                details::free_node(*node_allocator_,condition); 
  |  
  |                return branch; 
  |             } 
  |  
  |             loop_runtime_check_ptr rtc = get_loop_runtime_check(loop_runtime_check::e_repeat_until_loop); 
  |  
  |             if (!break_continue_present) 
  |             { 
  |                if (rtc) 
  |                   return node_allocator_->allocate<repeat_until_loop_rtc_node_t> 
  |                            (condition, branch,  rtc); 
  |                else 
  |                   return node_allocator_->allocate<repeat_until_loop_node_t> 
  |                            (condition, branch); 
  |             } 
  |             #ifndef exprtk_disable_break_continue 
  |             else 
  |             { 
  |                if (rtc) 
  |                   return node_allocator_->allocate<repeat_until_loop_bc_rtc_node_t> 
  |                            (condition, branch, rtc); 
  |                else 
  |                   return node_allocator_->allocate<repeat_until_loop_bc_node_t> 
  |                            (condition, branch); 
  |             } 
  |             #else 
  |                return error_node(); 
  |             #endif 
  |          } 
  |  
  |          inline expression_node_ptr for_loop(expression_node_ptr& initialiser, 
  |                                              expression_node_ptr& condition, 
  |                                              expression_node_ptr& incrementor, 
  |                                              expression_node_ptr& loop_body, 
  |                                              bool break_continue_present = false) const 
  |          { 
  |             if ( 
  |                  !break_continue_present              && 
  |                  !parser_->state_.return_stmt_present && 
  |                  details::is_constant_node(condition) 
  |                ) 
  |             { 
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (details::is_true(condition)) 
  |                { 
  |                   // Infinite loops are not allowed. 
  |  
  |                   parser_->set_error(parser_error::make_error( 
  |                      parser_error::e_parser, 
  |                      parser_->current_state().token, 
  |                      "ERR256 - Infinite loop condition without 'break' or 'return' not allowed in for-loop", 
  |                      exprtk_error_location)); 
  |  
  |                   result = error_node(); 
  |                } 
  |                else 
  |                   result = node_allocator_->allocate<details::null_node<Type> >(); 
  |  
  |                details::free_node(*node_allocator_, initialiser); 
  |                details::free_node(*node_allocator_, condition  ); 
  |                details::free_node(*node_allocator_, incrementor); 
  |                details::free_node(*node_allocator_, loop_body  ); 
  |  
  |                return result; 
  |             } 
  |             else if (details::is_null_node(condition) || (0 == condition)) 
  |             { 
  |                details::free_node(*node_allocator_, initialiser); 
  |                details::free_node(*node_allocator_, condition  ); 
  |                details::free_node(*node_allocator_, incrementor); 
  |  
  |                return loop_body; 
  |             } 
  |  
  |             loop_runtime_check_ptr rtc = get_loop_runtime_check(loop_runtime_check::e_for_loop); 
  |  
  |             if (!break_continue_present) 
  |             { 
  |                if (rtc) 
  |                   return node_allocator_->allocate<for_loop_rtc_node_t> 
  |                                           ( 
  |                                              initialiser, 
  |                                              condition, 
  |                                              incrementor, 
  |                                              loop_body, 
  |                                              rtc 
  |                                           ); 
  |                else 
  |                   return node_allocator_->allocate<for_loop_node_t> 
  |                                           ( 
  |                                              initialiser, 
  |                                              condition, 
  |                                              incrementor, 
  |                                              loop_body 
  |                                           ); 
  |             } 
  |             #ifndef exprtk_disable_break_continue 
  |             else 
  |             { 
  |                if (rtc) 
  |                   return node_allocator_->allocate<for_loop_bc_rtc_node_t> 
  |                                           ( 
  |                                              initialiser, 
  |                                              condition, 
  |                                              incrementor, 
  |                                              loop_body, 
  |                                              rtc 
  |                                           ); 
  |                else 
  |                   return node_allocator_->allocate<for_loop_bc_node_t> 
  |                                           ( 
  |                                              initialiser, 
  |                                              condition, 
  |                                              incrementor, 
  |                                              loop_body 
  |                                           ); 
  |             } 
  |             #else 
  |                return error_node(); 
  |             #endif 
  |          } 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          inline expression_node_ptr const_optimise_switch(Sequence<expression_node_ptr,Allocator>& arg_list) 
  |          { 
  |             expression_node_ptr result = error_node(); 
  |  
  |             for (std::size_t i = 0; i < (arg_list.size() / 2); ++i) 
  |             { 
  |                expression_node_ptr condition  = arg_list[(2 * i)    ]; 
  |                expression_node_ptr consequent = arg_list[(2 * i) + 1]; 
  |  
  |                if ((0 == result) && details::is_true(condition)) 
  |                { 
  |                   result = consequent; 
  |                   break; 
  |                } 
  |             } 
  |  
  |             if (0 == result) 
  |             { 
  |                result = arg_list.back(); 
  |             } 
  |  
  |             for (std::size_t i = 0; i < arg_list.size(); ++i) 
  |             { 
  |                expression_node_ptr current_expr = arg_list[i]; 
  |  
  |                if (current_expr && (current_expr != result)) 
  |                { 
  |                   free_node(*node_allocator_,current_expr); 
  |                } 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          inline expression_node_ptr const_optimise_mswitch(Sequence<expression_node_ptr,Allocator>& arg_list) 
  |          { 
  |             expression_node_ptr result = error_node(); 
  |  
  |             for (std::size_t i = 0; i < (arg_list.size() / 2); ++i) 
  |             { 
  |                expression_node_ptr condition  = arg_list[(2 * i)    ]; 
  |                expression_node_ptr consequent = arg_list[(2 * i) + 1]; 
  |  
  |                if (details::is_true(condition)) 
  |                { 
  |                   result = consequent; 
  |                } 
  |             } 
  |  
  |             if (0 == result) 
  |             { 
  |                const T zero = T(0); 
  |                result       = node_allocator_->allocate<literal_node_t>(zero); 
  |             } 
  |  
  |             for (std::size_t i = 0; i < arg_list.size(); ++i) 
  |             { 
  |                expression_node_ptr& current_expr = arg_list[i]; 
  |  
  |                if (current_expr && (current_expr != result)) 
  |                { 
  |                   details::free_node(*node_allocator_,current_expr); 
  |                } 
  |             } 
  |  
  |             return result; 
  |          } 
  |  
  |          struct switch_nodes 
  |          { 
  |             typedef std::vector<std::pair<expression_node_ptr,bool> > arg_list_t; 
  |  
  |             #define case_stmt(N)                                                         \ 
  |             if (is_true(arg[(2 * N)].first)) { return arg[(2 * N) + 1].first->value(); } \ 
  |  
  |             struct switch_impl_1 
  |             { 
  |                static inline T process(const arg_list_t& arg) 
  |                { 
  |                   case_stmt(0) 
  |  
  |                   assert(arg.size() == ((2 * 1) + 1)); 
  |  
  |                   return arg.back().first->value(); 
  |                } 
  |             }; 
  |  
  |             struct switch_impl_2 
  |             { 
  |                static inline T process(const arg_list_t& arg) 
  |                { 
  |                   case_stmt(0) case_stmt(1) 
  |  
  |                   assert(arg.size() == ((2 * 2) + 1)); 
  |  
  |                   return arg.back().first->value(); 
  |                } 
  |             }; 
  |  
  |             struct switch_impl_3 
  |             { 
  |                static inline T process(const arg_list_t& arg) 
  |                { 
  |                   case_stmt(0) case_stmt(1) 
  |                   case_stmt(2) 
  |  
  |                   assert(arg.size() == ((2 * 3) + 1)); 
  |  
  |                   return arg.back().first->value(); 
  |                } 
  |             }; 
  |  
  |             struct switch_impl_4 
  |             { 
  |                static inline T process(const arg_list_t& arg) 
  |                { 
  |                   case_stmt(0) case_stmt(1) 
  |                   case_stmt(2) case_stmt(3) 
  |  
  |                   assert(arg.size() == ((2 * 4) + 1)); 
  |  
  |                   return arg.back().first->value(); 
  |                } 
  |             }; 
  |  
  |             struct switch_impl_5 
  |             { 
  |                static inline T process(const arg_list_t& arg) 
  |                { 
  |                   case_stmt(0) case_stmt(1) 
  |                   case_stmt(2) case_stmt(3) 
  |                   case_stmt(4) 
  |  
  |                   assert(arg.size() == ((2 * 5) + 1)); 
  |  
  |                   return arg.back().first->value(); 
  |                } 
  |             }; 
  |  
  |             struct switch_impl_6 
  |             { 
  |                static inline T process(const arg_list_t& arg) 
  |                { 
  |                   case_stmt(0) case_stmt(1) 
  |                   case_stmt(2) case_stmt(3) 
  |                   case_stmt(4) case_stmt(5) 
  |  
  |                   assert(arg.size() == ((2 * 6) + 1)); 
  |  
  |                   return arg.back().first->value(); 
  |                } 
  |             }; 
  |  
  |             struct switch_impl_7 
  |             { 
  |                static inline T process(const arg_list_t& arg) 
  |                { 
  |                   case_stmt(0) case_stmt(1) 
  |                   case_stmt(2) case_stmt(3) 
  |                   case_stmt(4) case_stmt(5) 
  |                   case_stmt(6) 
  |  
  |                   assert(arg.size() == ((2 * 7) + 1)); 
  |  
  |                   return arg.back().first->value(); 
  |                } 
  |             }; 
  |  
  |             #undef case_stmt 
  |          }; 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          inline expression_node_ptr switch_statement(Sequence<expression_node_ptr,Allocator>& arg_list, const bool default_statement_present) 
  |          { 
  |             if (arg_list.empty()) 
  |                return error_node(); 
  |             else if ( 
  |                       !all_nodes_valid(arg_list) || 
  |                       (!default_statement_present && (arg_list.size() < 2)) 
  |                     ) 
  |             { 
  |                details::free_all_nodes(*node_allocator_,arg_list); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (is_constant_foldable(arg_list)) 
  |                return const_optimise_switch(arg_list); 
  |  
  |             switch ((arg_list.size() - 1) / 2) 
  |             { 
  |                #define case_stmt(N)                                                       \ 
  |                case N :                                                                   \ 
  |                   return node_allocator_->                                                \ 
  |                             allocate<details::switch_n_node                               \ 
  |                               <Type,typename switch_nodes::switch_impl_##N > >(arg_list); \ 
  |  
  |                case_stmt(1) 
  |                case_stmt(2) 
  |                case_stmt(3) 
  |                case_stmt(4) 
  |                case_stmt(5) 
  |                case_stmt(6) 
  |                case_stmt(7) 
  |                #undef case_stmt 
  |  
  |                default : return node_allocator_->allocate<details::switch_node<Type> >(arg_list); 
  |             } 
  |          } 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          inline expression_node_ptr multi_switch_statement(Sequence<expression_node_ptr,Allocator>& arg_list) 
  |          { 
  |             if (!all_nodes_valid(arg_list)) 
  |             { 
  |                details::free_all_nodes(*node_allocator_,arg_list); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (is_constant_foldable(arg_list)) 
  |                return const_optimise_mswitch(arg_list); 
  |             else 
  |                return node_allocator_->allocate<details::multi_switch_node<Type> >(arg_list); 
  |          } 
  |  
  |          inline expression_node_ptr assert_call(expression_node_ptr& assert_condition, 
  |                                                 expression_node_ptr& assert_message, 
  |                                                 const assert_check::assert_context& context) 
  |          { 
  |             typedef details::assert_node<Type> alloc_type; 
  |  
  |             expression_node_ptr result = node_allocator_->allocate_rrrr<alloc_type> 
  |                (assert_condition, assert_message, parser_->assert_check_, context); 
  |  
  |             if (result && result->valid()) 
  |             { 
  |                parser_->state_.activate_side_effect("assert_call()"); 
  |                return result; 
  |             } 
  |  
  |             details::free_node(*node_allocator_, result          ); 
  |             details::free_node(*node_allocator_, assert_condition); 
  |             details::free_node(*node_allocator_, assert_message  ); 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          #define unary_opr_switch_statements             \ 
  |          case_stmt(details::e_abs   , details::abs_op  ) \ 
  |          case_stmt(details::e_acos  , details::acos_op ) \ 
  |          case_stmt(details::e_acosh , details::acosh_op) \ 
  |          case_stmt(details::e_asin  , details::asin_op ) \ 
  |          case_stmt(details::e_asinh , details::asinh_op) \ 
  |          case_stmt(details::e_atan  , details::atan_op ) \ 
  |          case_stmt(details::e_atanh , details::atanh_op) \ 
  |          case_stmt(details::e_ceil  , details::ceil_op ) \ 
  |          case_stmt(details::e_cos   , details::cos_op  ) \ 
  |          case_stmt(details::e_cosh  , details::cosh_op ) \ 
  |          case_stmt(details::e_exp   , details::exp_op  ) \ 
  |          case_stmt(details::e_expm1 , details::expm1_op) \ 
  |          case_stmt(details::e_floor , details::floor_op) \ 
  |          case_stmt(details::e_log   , details::log_op  ) \ 
  |          case_stmt(details::e_log10 , details::log10_op) \ 
  |          case_stmt(details::e_log2  , details::log2_op ) \ 
  |          case_stmt(details::e_log1p , details::log1p_op) \ 
  |          case_stmt(details::e_neg   , details::neg_op  ) \ 
  |          case_stmt(details::e_pos   , details::pos_op  ) \ 
  |          case_stmt(details::e_round , details::round_op) \ 
  |          case_stmt(details::e_sin   , details::sin_op  ) \ 
  |          case_stmt(details::e_sinc  , details::sinc_op ) \ 
  |          case_stmt(details::e_sinh  , details::sinh_op ) \ 
  |          case_stmt(details::e_sqrt  , details::sqrt_op ) \ 
  |          case_stmt(details::e_tan   , details::tan_op  ) \ 
  |          case_stmt(details::e_tanh  , details::tanh_op ) \ 
  |          case_stmt(details::e_cot   , details::cot_op  ) \ 
  |          case_stmt(details::e_sec   , details::sec_op  ) \ 
  |          case_stmt(details::e_csc   , details::csc_op  ) \ 
  |          case_stmt(details::e_r2d   , details::r2d_op  ) \ 
  |          case_stmt(details::e_d2r   , details::d2r_op  ) \ 
  |          case_stmt(details::e_d2g   , details::d2g_op  ) \ 
  |          case_stmt(details::e_g2d   , details::g2d_op  ) \ 
  |          case_stmt(details::e_notl  , details::notl_op ) \ 
  |          case_stmt(details::e_sgn   , details::sgn_op  ) \ 
  |          case_stmt(details::e_erf   , details::erf_op  ) \ 
  |          case_stmt(details::e_erfc  , details::erfc_op ) \ 
  |          case_stmt(details::e_ncdf  , details::ncdf_op ) \ 
  |          case_stmt(details::e_frac  , details::frac_op ) \ 
  |          case_stmt(details::e_trunc , details::trunc_op) \ 
  |  
  |          inline expression_node_ptr synthesize_uv_expression(const details::operator_type& operation, 
  |                                                              expression_node_ptr (&branch)[1]) 
  |          { 
  |             T& v = static_cast<details::variable_node<T>*>(branch[0])->ref(); 
  |  
  |             switch (operation) 
  |             { 
  |                #define case_stmt(op0, op1)                                                         \ 
  |                case op0 : return node_allocator_->                                                 \ 
  |                              allocate<typename details::unary_variable_node<Type,op1<Type> > >(v); \ 
  |  
  |                unary_opr_switch_statements 
  |                #undef case_stmt 
  |                default : return error_node(); 
  |             } 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_uvec_expression(const details::operator_type& operation, 
  |                                                                expression_node_ptr (&branch)[1]) 
  |          { 
  |             switch (operation) 
  |             { 
  |                #define case_stmt(op0, op1)                                                   \ 
  |                case op0 : return node_allocator_->                                           \ 
  |                              allocate<typename details::unary_vector_node<Type,op1<Type> > > \ 
  |                                 (operation, branch[0]);                                      \ 
  |  
  |                unary_opr_switch_statements 
  |                #undef case_stmt 
  |                default : return error_node(); 
  |             } 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_unary_expression(const details::operator_type& operation, 
  |                                                                 expression_node_ptr (&branch)[1]) 
  |          { 
  |             switch (operation) 
  |             { 
  |                #define case_stmt(op0, op1)                                                               \ 
  |                case op0 : return node_allocator_->                                                       \ 
  |                              allocate<typename details::unary_branch_node<Type,op1<Type> > >(branch[0]); \ 
  |  
  |                unary_opr_switch_statements 
  |                #undef case_stmt 
  |                default : return error_node(); 
  |             } 
  |          } 
  |  
  |          inline expression_node_ptr const_optimise_sf3(const details::operator_type& operation, 
  |                                                        expression_node_ptr (&branch)[3]) 
  |          { 
  |             expression_node_ptr temp_node = error_node(); 
  |  
  |             switch (operation) 
  |             { 
  |                #define case_stmt(op)                                                        \ 
  |                case details::e_sf##op : temp_node = node_allocator_->                       \ 
  |                              allocate<details::sf3_node<Type,details::sf##op##_op<Type> > > \ 
  |                                 (operation, branch);                                        \ 
  |                              break;                                                         \ 
  |  
  |                case_stmt(00) case_stmt(01) case_stmt(02) case_stmt(03) 
  |                case_stmt(04) case_stmt(05) case_stmt(06) case_stmt(07) 
  |                case_stmt(08) case_stmt(09) case_stmt(10) case_stmt(11) 
  |                case_stmt(12) case_stmt(13) case_stmt(14) case_stmt(15) 
  |                case_stmt(16) case_stmt(17) case_stmt(18) case_stmt(19) 
  |                case_stmt(20) case_stmt(21) case_stmt(22) case_stmt(23) 
  |                case_stmt(24) case_stmt(25) case_stmt(26) case_stmt(27) 
  |                case_stmt(28) case_stmt(29) case_stmt(30) case_stmt(31) 
  |                case_stmt(32) case_stmt(33) case_stmt(34) case_stmt(35) 
  |                case_stmt(36) case_stmt(37) case_stmt(38) case_stmt(39) 
  |                case_stmt(40) case_stmt(41) case_stmt(42) case_stmt(43) 
  |                case_stmt(44) case_stmt(45) case_stmt(46) case_stmt(47) 
  |                #undef case_stmt 
  |                default : return error_node(); 
  |             } 
  |  
  |             assert(temp_node); 
  |  
  |             const T v = temp_node->value(); 
  |  
  |             details::free_node(*node_allocator_,temp_node); 
  |  
  |             return node_allocator_->allocate<literal_node_t>(v); 
  |          } 
  |  
  |          inline expression_node_ptr varnode_optimise_sf3(const details::operator_type& operation, expression_node_ptr (&branch)[3]) 
  |          { 
  |             typedef details::variable_node<Type>* variable_ptr; 
  |  
  |             const Type& v0 = static_cast<variable_ptr>(branch[0])->ref(); 
  |             const Type& v1 = static_cast<variable_ptr>(branch[1])->ref(); 
  |             const Type& v2 = static_cast<variable_ptr>(branch[2])->ref(); 
  |  
  |             switch (operation) 
  |             { 
  |                #define case_stmt(op)                                                                \ 
  |                case details::e_sf##op : return node_allocator_->                                    \ 
  |                              allocate_rrr<details::sf3_var_node<Type,details::sf##op##_op<Type> > > \ 
  |                                 (v0, v1, v2);                                                       \ 
  |  
  |                case_stmt(00) case_stmt(01) case_stmt(02) case_stmt(03) 
  |                case_stmt(04) case_stmt(05) case_stmt(06) case_stmt(07) 
  |                case_stmt(08) case_stmt(09) case_stmt(10) case_stmt(11) 
  |                case_stmt(12) case_stmt(13) case_stmt(14) case_stmt(15) 
  |                case_stmt(16) case_stmt(17) case_stmt(18) case_stmt(19) 
  |                case_stmt(20) case_stmt(21) case_stmt(22) case_stmt(23) 
  |                case_stmt(24) case_stmt(25) case_stmt(26) case_stmt(27) 
  |                case_stmt(28) case_stmt(29) case_stmt(30) case_stmt(31) 
  |                case_stmt(32) case_stmt(33) case_stmt(34) case_stmt(35) 
  |                case_stmt(36) case_stmt(37) case_stmt(38) case_stmt(39) 
  |                case_stmt(40) case_stmt(41) case_stmt(42) case_stmt(43) 
  |                case_stmt(44) case_stmt(45) case_stmt(46) case_stmt(47) 
  |                #undef case_stmt 
  |                default : return error_node(); 
  |             } 
  |          } 
  |  
  |          inline expression_node_ptr special_function(const details::operator_type& operation, expression_node_ptr (&branch)[3]) 
  |          { 
  |             if (!all_nodes_valid(branch)) 
  |                return error_node(); 
  |             else if (is_constant_foldable(branch)) 
  |                return const_optimise_sf3(operation,branch); 
  |             else if (all_nodes_variables(branch)) 
  |                return varnode_optimise_sf3(operation,branch); 
  |             else 
  |             { 
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op)                                                        \ 
  |                   case details::e_sf##op : return node_allocator_->                            \ 
  |                                 allocate<details::sf3_node<Type,details::sf##op##_op<Type> > > \ 
  |                                    (operation, branch);                                        \ 
  |  
  |                   case_stmt(00) case_stmt(01) case_stmt(02) case_stmt(03) 
  |                   case_stmt(04) case_stmt(05) case_stmt(06) case_stmt(07) 
  |                   case_stmt(08) case_stmt(09) case_stmt(10) case_stmt(11) 
  |                   case_stmt(12) case_stmt(13) case_stmt(14) case_stmt(15) 
  |                   case_stmt(16) case_stmt(17) case_stmt(18) case_stmt(19) 
  |                   case_stmt(20) case_stmt(21) case_stmt(22) case_stmt(23) 
  |                   case_stmt(24) case_stmt(25) case_stmt(26) case_stmt(27) 
  |                   case_stmt(28) case_stmt(29) case_stmt(30) case_stmt(31) 
  |                   case_stmt(32) case_stmt(33) case_stmt(34) case_stmt(35) 
  |                   case_stmt(36) case_stmt(37) case_stmt(38) case_stmt(39) 
  |                   case_stmt(40) case_stmt(41) case_stmt(42) case_stmt(43) 
  |                   case_stmt(44) case_stmt(45) case_stmt(46) case_stmt(47) 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |          } 
  |  
  |          inline expression_node_ptr const_optimise_sf4(const details::operator_type& operation, expression_node_ptr (&branch)[4]) 
  |          { 
  |             expression_node_ptr temp_node = error_node(); 
  |  
  |             switch (operation) 
  |             { 
  |                #define case_stmt(op)                                                                    \ 
  |                case details::e_sf##op : temp_node = node_allocator_->                                   \ 
  |                                          allocate<details::sf4_node<Type,details::sf##op##_op<Type> > > \ 
  |                                             (operation, branch);                                        \ 
  |                                         break;                                                          \ 
  |  
  |                case_stmt(48) case_stmt(49) case_stmt(50) case_stmt(51) 
  |                case_stmt(52) case_stmt(53) case_stmt(54) case_stmt(55) 
  |                case_stmt(56) case_stmt(57) case_stmt(58) case_stmt(59) 
  |                case_stmt(60) case_stmt(61) case_stmt(62) case_stmt(63) 
  |                case_stmt(64) case_stmt(65) case_stmt(66) case_stmt(67) 
  |                case_stmt(68) case_stmt(69) case_stmt(70) case_stmt(71) 
  |                case_stmt(72) case_stmt(73) case_stmt(74) case_stmt(75) 
  |                case_stmt(76) case_stmt(77) case_stmt(78) case_stmt(79) 
  |                case_stmt(80) case_stmt(81) case_stmt(82) case_stmt(83) 
  |                case_stmt(84) case_stmt(85) case_stmt(86) case_stmt(87) 
  |                case_stmt(88) case_stmt(89) case_stmt(90) case_stmt(91) 
  |                case_stmt(92) case_stmt(93) case_stmt(94) case_stmt(95) 
  |                case_stmt(96) case_stmt(97) case_stmt(98) case_stmt(99) 
  |                #undef case_stmt 
  |                default : return error_node(); 
  |             } 
  |  
  |             assert(temp_node); 
  |  
  |             const T v = temp_node->value(); 
  |  
  |             details::free_node(*node_allocator_,temp_node); 
  |  
  |             return node_allocator_->allocate<literal_node_t>(v); 
  |          } 
  |  
  |          inline expression_node_ptr varnode_optimise_sf4(const details::operator_type& operation, expression_node_ptr (&branch)[4]) 
  |          { 
  |             typedef details::variable_node<Type>* variable_ptr; 
  |  
  |             const Type& v0 = static_cast<variable_ptr>(branch[0])->ref(); 
  |             const Type& v1 = static_cast<variable_ptr>(branch[1])->ref(); 
  |             const Type& v2 = static_cast<variable_ptr>(branch[2])->ref(); 
  |             const Type& v3 = static_cast<variable_ptr>(branch[3])->ref(); 
  |  
  |             switch (operation) 
  |             { 
  |                #define case_stmt(op)                                                                 \ 
  |                case details::e_sf##op : return node_allocator_->                                     \ 
  |                              allocate_rrrr<details::sf4_var_node<Type,details::sf##op##_op<Type> > > \ 
  |                                 (v0, v1, v2, v3);                                                    \ 
  |  
  |                case_stmt(48) case_stmt(49) case_stmt(50) case_stmt(51) 
  |                case_stmt(52) case_stmt(53) case_stmt(54) case_stmt(55) 
  |                case_stmt(56) case_stmt(57) case_stmt(58) case_stmt(59) 
  |                case_stmt(60) case_stmt(61) case_stmt(62) case_stmt(63) 
  |                case_stmt(64) case_stmt(65) case_stmt(66) case_stmt(67) 
  |                case_stmt(68) case_stmt(69) case_stmt(70) case_stmt(71) 
  |                case_stmt(72) case_stmt(73) case_stmt(74) case_stmt(75) 
  |                case_stmt(76) case_stmt(77) case_stmt(78) case_stmt(79) 
  |                case_stmt(80) case_stmt(81) case_stmt(82) case_stmt(83) 
  |                case_stmt(84) case_stmt(85) case_stmt(86) case_stmt(87) 
  |                case_stmt(88) case_stmt(89) case_stmt(90) case_stmt(91) 
  |                case_stmt(92) case_stmt(93) case_stmt(94) case_stmt(95) 
  |                case_stmt(96) case_stmt(97) case_stmt(98) case_stmt(99) 
  |                #undef case_stmt 
  |                default : return error_node(); 
  |             } 
  |          } 
  |  
  |          inline expression_node_ptr special_function(const details::operator_type& operation, expression_node_ptr (&branch)[4]) 
  |          { 
  |             if (!all_nodes_valid(branch)) 
  |                return error_node(); 
  |             else if (is_constant_foldable(branch)) 
  |                return const_optimise_sf4(operation,branch); 
  |             else if (all_nodes_variables(branch)) 
  |                return varnode_optimise_sf4(operation,branch); 
  |             switch (operation) 
  |             { 
  |                #define case_stmt(op)                                                        \ 
  |                case details::e_sf##op : return node_allocator_->                            \ 
  |                              allocate<details::sf4_node<Type,details::sf##op##_op<Type> > > \ 
  |                                 (operation, branch);                                        \ 
  |  
  |                case_stmt(48) case_stmt(49) case_stmt(50) case_stmt(51) 
  |                case_stmt(52) case_stmt(53) case_stmt(54) case_stmt(55) 
  |                case_stmt(56) case_stmt(57) case_stmt(58) case_stmt(59) 
  |                case_stmt(60) case_stmt(61) case_stmt(62) case_stmt(63) 
  |                case_stmt(64) case_stmt(65) case_stmt(66) case_stmt(67) 
  |                case_stmt(68) case_stmt(69) case_stmt(70) case_stmt(71) 
  |                case_stmt(72) case_stmt(73) case_stmt(74) case_stmt(75) 
  |                case_stmt(76) case_stmt(77) case_stmt(78) case_stmt(79) 
  |                case_stmt(80) case_stmt(81) case_stmt(82) case_stmt(83) 
  |                case_stmt(84) case_stmt(85) case_stmt(86) case_stmt(87) 
  |                case_stmt(88) case_stmt(89) case_stmt(90) case_stmt(91) 
  |                case_stmt(92) case_stmt(93) case_stmt(94) case_stmt(95) 
  |                case_stmt(96) case_stmt(97) case_stmt(98) case_stmt(99) 
  |                #undef case_stmt 
  |                default : return error_node(); 
  |             } 
  |          } 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          inline expression_node_ptr const_optimise_varargfunc(const details::operator_type& operation, Sequence<expression_node_ptr,Allocator>& arg_list) 
  |          { 
  |             expression_node_ptr temp_node = error_node(); 
  |  
  |             switch (operation) 
  |             { 
  |                #define case_stmt(op0, op1)                                                \ 
  |                case op0 : temp_node = node_allocator_->                                   \ 
  |                                          allocate<details::vararg_node<Type,op1<Type> > > \ 
  |                                             (arg_list);                                   \ 
  |                           break;                                                          \ 
  |  
  |                case_stmt(details::e_sum   , details::vararg_add_op  ) 
  |                case_stmt(details::e_prod  , details::vararg_mul_op  ) 
  |                case_stmt(details::e_avg   , details::vararg_avg_op  ) 
  |                case_stmt(details::e_min   , details::vararg_min_op  ) 
  |                case_stmt(details::e_max   , details::vararg_max_op  ) 
  |                case_stmt(details::e_mand  , details::vararg_mand_op ) 
  |                case_stmt(details::e_mor   , details::vararg_mor_op  ) 
  |                case_stmt(details::e_multi , details::vararg_multi_op) 
  |                #undef case_stmt 
  |                default : return error_node(); 
  |             } 
  |  
  |             const T v = temp_node->value(); 
  |  
  |             details::free_node(*node_allocator_,temp_node); 
  |  
  |             return node_allocator_->allocate<literal_node_t>(v); 
  |          } 
  |  
  |          inline bool special_one_parameter_vararg(const details::operator_type& operation) const 
  |          { 
  |             return ( 
  |                      (details::e_sum  == operation) || 
  |                      (details::e_prod == operation) || 
  |                      (details::e_avg  == operation) || 
  |                      (details::e_min  == operation) || 
  |                      (details::e_max  == operation) 
  |                    ); 
  |          } 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          inline expression_node_ptr varnode_optimise_varargfunc(const details::operator_type& operation, 
  |                                                                 Sequence<expression_node_ptr,Allocator>& arg_list) 
  |          { 
  |             switch (operation) 
  |             { 
  |                #define case_stmt(op0, op1)                                                  \ 
  |                case op0 : return node_allocator_->                                          \ 
  |                              allocate<details::vararg_varnode<Type,op1<Type> > >(arg_list); \ 
  |  
  |                case_stmt(details::e_sum   , details::vararg_add_op  ) 
  |                case_stmt(details::e_prod  , details::vararg_mul_op  ) 
  |                case_stmt(details::e_avg   , details::vararg_avg_op  ) 
  |                case_stmt(details::e_min   , details::vararg_min_op  ) 
  |                case_stmt(details::e_max   , details::vararg_max_op  ) 
  |                case_stmt(details::e_mand  , details::vararg_mand_op ) 
  |                case_stmt(details::e_mor   , details::vararg_mor_op  ) 
  |                case_stmt(details::e_multi , details::vararg_multi_op) 
  |                #undef case_stmt 
  |                default : return error_node(); 
  |             } 
  |          } 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          inline expression_node_ptr vectorize_func(const details::operator_type& operation, 
  |                                                    Sequence<expression_node_ptr,Allocator>& arg_list) 
  |          { 
  |             if (1 == arg_list.size()) 
  |             { 
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                     \ 
  |                   case op0 : return node_allocator_->                                             \ 
  |                                 allocate<details::vectorize_node<Type,op1<Type> > >(arg_list[0]); \ 
  |  
  |                   case_stmt(details::e_sum  , details::vec_add_op) 
  |                   case_stmt(details::e_prod , details::vec_mul_op) 
  |                   case_stmt(details::e_avg  , details::vec_avg_op) 
  |                   case_stmt(details::e_min  , details::vec_min_op) 
  |                   case_stmt(details::e_max  , details::vec_max_op) 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |             else 
  |                return error_node(); 
  |          } 
  |  
  |          template <typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          inline expression_node_ptr vararg_function(const details::operator_type& operation, 
  |                                                     Sequence<expression_node_ptr,Allocator>& arg_list) 
  |          { 
  |             if (!all_nodes_valid(arg_list)) 
  |             { 
  |                details::free_all_nodes(*node_allocator_,arg_list); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (is_constant_foldable(arg_list)) 
  |                return const_optimise_varargfunc(operation,arg_list); 
  |             else if ((1 == arg_list.size()) && details::is_ivector_node(arg_list[0])) 
  |                return vectorize_func(operation,arg_list); 
  |             else if ((1 == arg_list.size()) && special_one_parameter_vararg(operation)) 
  |                return arg_list[0]; 
  |             else if (all_nodes_variables(arg_list)) 
  |                return varnode_optimise_varargfunc(operation,arg_list); 
  |  
  |             #ifndef exprtk_disable_string_capabilities 
  |             if (details::e_smulti == operation) 
  |             { 
  |                expression_node_ptr result = node_allocator_-> 
  |                  allocate<details::str_vararg_node<Type,details::vararg_multi_op<Type> > >(arg_list); 
  |                if (result && result->valid()) 
  |                { 
  |                   return result; 
  |                } 
  |  
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_synthesis, 
  |                   token_t(), 
  |                   "ERR257 - Failed to synthesize node: str_vararg_node<vararg_multi_op>", 
  |                   exprtk_error_location)); 
  |  
  |                details::free_node(*node_allocator_, result); 
  |             } 
  |             else 
  |             #endif 
  |             { 
  |                expression_node_ptr result = error_node(); 
  |  
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                               \ 
  |                   case op0 : result = node_allocator_->                                     \ 
  |                                 allocate<details::vararg_node<Type,op1<Type> > >(arg_list); \ 
  |                              break;                                                         \ 
  |  
  |                   case_stmt(details::e_sum   , details::vararg_add_op  ) 
  |                   case_stmt(details::e_prod  , details::vararg_mul_op  ) 
  |                   case_stmt(details::e_avg   , details::vararg_avg_op  ) 
  |                   case_stmt(details::e_min   , details::vararg_min_op  ) 
  |                   case_stmt(details::e_max   , details::vararg_max_op  ) 
  |                   case_stmt(details::e_mand  , details::vararg_mand_op ) 
  |                   case_stmt(details::e_mor   , details::vararg_mor_op  ) 
  |                   case_stmt(details::e_multi , details::vararg_multi_op) 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |  
  |                if (result && result->valid()) 
  |                { 
  |                   return result; 
  |                } 
  |  
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_synthesis, 
  |                   token_t(), 
  |                   "ERR258 - Failed to synthesize node: vararg_node", 
  |                   exprtk_error_location)); 
  |  
  |                details::free_node(*node_allocator_, result); 
  |             } 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          template <std::size_t N> 
  |          inline expression_node_ptr function(ifunction_t* f, expression_node_ptr (&b)[N]) 
  |          { 
  |             typedef typename details::function_N_node<T,ifunction_t,N> function_N_node_t; 
  |             expression_node_ptr result = synthesize_expression<function_N_node_t,N>(f,b); 
  |  
  |             if (0 == result) 
  |                return error_node(); 
  |             else 
  |             { 
  |                // Can the function call be completely optimised? 
  |                if (details::is_constant_node(result)) 
  |                   return result; 
  |                else if (!all_nodes_valid(b)) 
  |                { 
  |                   details::free_node(*node_allocator_,result); 
  |                   std::fill_n(b, N, reinterpret_cast<expression_node_ptr>(0)); 
  |  
  |                   return error_node(); 
  |                } 
  |                else if (N != f->param_count) 
  |                { 
  |                   details::free_node(*node_allocator_,result); 
  |                   std::fill_n(b, N, reinterpret_cast<expression_node_ptr>(0)); 
  |  
  |                   return error_node(); 
  |                } 
  |  
  |                function_N_node_t* func_node_ptr = reinterpret_cast<function_N_node_t*>(result); 
  |  
  |                if (!func_node_ptr->init_branches(b)) 
  |                { 
  |                   details::free_node(*node_allocator_,result); 
  |                   std::fill_n(b, N, reinterpret_cast<expression_node_ptr>(0)); 
  |  
  |                   return error_node(); 
  |                } 
  |  
  |                if (result && result->valid()) 
  |                { 
  |                   return result; 
  |                } 
  |  
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_synthesis, 
  |                   token_t(), 
  |                   "ERR259 - Failed to synthesize node: function_N_node_t", 
  |                   exprtk_error_location)); 
  |  
  |                details::free_node(*node_allocator_, result); 
  |                return error_node(); 
  |             } 
  |          } 
  |  
  |          inline expression_node_ptr function(ifunction_t* f) 
  |          { 
  |             typedef typename details::function_N_node<Type,ifunction_t,0> function_N_node_t; 
  |             return node_allocator_->allocate<function_N_node_t>(f); 
  |          } 
  |  
  |          inline expression_node_ptr vararg_function_call(ivararg_function_t* vaf, 
  |                                                          std::vector<expression_node_ptr>& arg_list) 
  |          { 
  |             if (!all_nodes_valid(arg_list)) 
  |             { 
  |                details::free_all_nodes(*node_allocator_,arg_list); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             typedef details::vararg_function_node<Type,ivararg_function_t> alloc_type; 
  |  
  |             expression_node_ptr result = node_allocator_->allocate<alloc_type>(vaf,arg_list); 
  |  
  |             if ( 
  |                  !arg_list.empty()        && 
  |                  !vaf->has_side_effects() && 
  |                  is_constant_foldable(arg_list) 
  |                ) 
  |             { 
  |                const Type v = result->value(); 
  |                details::free_node(*node_allocator_,result); 
  |                result = node_allocator_->allocate<literal_node_t>(v); 
  |             } 
  |  
  |             parser_->state_.activate_side_effect("vararg_function_call()"); 
  |  
  |             if (result && result->valid()) 
  |             { 
  |                return result; 
  |             } 
  |  
  |             parser_->set_error(parser_error::make_error( 
  |                parser_error::e_synthesis, 
  |                token_t(), 
  |                "ERR260 - Failed to synthesize node: vararg_function_node<ivararg_function_t>", 
  |                exprtk_error_location)); 
  |  
  |             details::free_node(*node_allocator_, result); 
  |             return error_node(); 
  |          } 
  |  
  |          inline expression_node_ptr generic_function_call(igeneric_function_t* gf, 
  |                                                           std::vector<expression_node_ptr>& arg_list, 
  |                                                           const std::size_t& param_seq_index = std::numeric_limits<std::size_t>::max()) 
  |          { 
  |             if (!all_nodes_valid(arg_list)) 
  |             { 
  |                details::free_all_nodes(*node_allocator_,arg_list); 
  |                return error_node(); 
  |             } 
  |  
  |             typedef details::generic_function_node     <Type,igeneric_function_t> alloc_type1; 
  |             typedef details::multimode_genfunction_node<Type,igeneric_function_t> alloc_type2; 
  |  
  |             const std::size_t no_psi = std::numeric_limits<std::size_t>::max(); 
  |  
  |             expression_node_ptr result = error_node(); 
  |             std::string node_name = "Unknown" 
  |  
  |             if (no_psi == param_seq_index) 
  |             { 
  |                result = node_allocator_->allocate<alloc_type1>(arg_list,gf); 
  |                node_name = "generic_function_node<igeneric_function_t>" 
  |             } 
  |             else 
  |             { 
  |                result = node_allocator_->allocate<alloc_type2>(gf, param_seq_index, arg_list); 
  |                node_name = "multimode_genfunction_node<igeneric_function_t>" 
  |             } 
  |  
  |             alloc_type1* genfunc_node_ptr = static_cast<alloc_type1*>(result); 
  |  
  |             assert(genfunc_node_ptr); 
  |  
  |             if ( 
  |                  !arg_list.empty()                  && 
  |                  !gf->has_side_effects()            && 
  |                  parser_->state_.type_check_enabled && 
  |                  is_constant_foldable(arg_list) 
  |                ) 
  |             { 
  |                genfunc_node_ptr->init_branches(); 
  |  
  |                const Type v = result->value(); 
  |  
  |                details::free_node(*node_allocator_,result); 
  |  
  |                return node_allocator_->allocate<literal_node_t>(v); 
  |             } 
  |             else if (genfunc_node_ptr->init_branches()) 
  |             { 
  |                if (result && result->valid()) 
  |                { 
  |                   parser_->state_.activate_side_effect("generic_function_call()"); 
  |                   return result; 
  |                } 
  |  
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_synthesis, 
  |                   token_t(), 
  |                   "ERR261 - Failed to synthesize node: " + node_name, 
  |                   exprtk_error_location)); 
  |  
  |                details::free_node(*node_allocator_, result); 
  |                return error_node(); 
  |             } 
  |             else 
  |             { 
  |                details::free_node(*node_allocator_, result); 
  |                details::free_all_nodes(*node_allocator_, arg_list); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          inline expression_node_ptr string_function_call(igeneric_function_t* gf, 
  |                                                          std::vector<expression_node_ptr>& arg_list, 
  |                                                          const std::size_t& param_seq_index = std::numeric_limits<std::size_t>::max()) 
  |          { 
  |             if (!all_nodes_valid(arg_list)) 
  |             { 
  |                details::free_all_nodes(*node_allocator_,arg_list); 
  |                return error_node(); 
  |             } 
  |  
  |             typedef details::string_function_node      <Type,igeneric_function_t> alloc_type1; 
  |             typedef details::multimode_strfunction_node<Type,igeneric_function_t> alloc_type2; 
  |  
  |             const std::size_t no_psi = std::numeric_limits<std::size_t>::max(); 
  |  
  |             expression_node_ptr result = error_node(); 
  |             std::string node_name = "Unknown" 
  |  
  |             if (no_psi == param_seq_index) 
  |             { 
  |                result = node_allocator_->allocate<alloc_type1>(gf,arg_list); 
  |                node_name = "string_function_node<igeneric_function_t>" 
  |             } 
  |             else 
  |             { 
  |                result = node_allocator_->allocate<alloc_type2>(gf, param_seq_index, arg_list); 
  |                node_name = "multimode_strfunction_node<igeneric_function_t>" 
  |             } 
  |  
  |             alloc_type1* strfunc_node_ptr = static_cast<alloc_type1*>(result); 
  |  
  |             assert(strfunc_node_ptr); 
  |  
  |             if ( 
  |                  !arg_list.empty()       && 
  |                  !gf->has_side_effects() && 
  |                  is_constant_foldable(arg_list) 
  |                ) 
  |             { 
  |                strfunc_node_ptr->init_branches(); 
  |  
  |                const Type v = result->value(); 
  |  
  |                details::free_node(*node_allocator_,result); 
  |  
  |                return node_allocator_->allocate<literal_node_t>(v); 
  |             } 
  |             else if (strfunc_node_ptr->init_branches()) 
  |             { 
  |                if (result && result->valid()) 
  |                { 
  |                   parser_->state_.activate_side_effect("string_function_call()"); 
  |                   return result; 
  |                } 
  |  
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_synthesis, 
  |                   token_t(), 
  |                   "ERR262 - Failed to synthesize node: " + node_name, 
  |                   exprtk_error_location)); 
  |  
  |                details::free_node(*node_allocator_, result); 
  |                return error_node(); 
  |             } 
  |             else 
  |             { 
  |                details::free_node     (*node_allocator_,result  ); 
  |                details::free_all_nodes(*node_allocator_,arg_list); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |          #endif 
  |  
  |          #ifndef exprtk_disable_return_statement 
  |          inline expression_node_ptr return_call(std::vector<expression_node_ptr>& arg_list) 
  |          { 
  |             if (!all_nodes_valid(arg_list)) 
  |             { 
  |                details::free_all_nodes(*node_allocator_,arg_list); 
  |                return error_node(); 
  |             } 
  |  
  |             typedef details::return_node<Type> alloc_type; 
  |  
  |             expression_node_ptr result = node_allocator_-> 
  |                                             allocate_rr<alloc_type>(arg_list,parser_->results_ctx()); 
  |  
  |             alloc_type* return_node_ptr = static_cast<alloc_type*>(result); 
  |  
  |             assert(return_node_ptr); 
  |  
  |             if (return_node_ptr->init_branches()) 
  |             { 
  |                if (result && result->valid()) 
  |                { 
  |                   parser_->state_.activate_side_effect("return_call()"); 
  |                   return result; 
  |                } 
  |  
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_synthesis, 
  |                   token_t(), 
  |                   "ERR263 - Failed to synthesize node: return_node", 
  |                   exprtk_error_location)); 
  |  
  |                details::free_node(*node_allocator_, result); 
  |                return error_node(); 
  |             } 
  |             else 
  |             { 
  |                details::free_node     (*node_allocator_, result  ); 
  |                details::free_all_nodes(*node_allocator_, arg_list); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |  
  |          inline expression_node_ptr return_envelope(expression_node_ptr body, 
  |                                                     results_context_t* rc, 
  |                                                     bool*& return_invoked) 
  |          { 
  |             typedef details::return_envelope_node<Type> alloc_type; 
  |  
  |             expression_node_ptr result = node_allocator_-> 
  |                                             allocate_cr<alloc_type>(body,(*rc)); 
  |  
  |             return_invoked = static_cast<alloc_type*>(result)->retinvk_ptr(); 
  |  
  |             return result; 
  |          } 
  |          #else 
  |          inline expression_node_ptr return_call(std::vector<expression_node_ptr>&) 
  |          { 
  |             return error_node(); 
  |          } 
  |  
  |          inline expression_node_ptr return_envelope(expression_node_ptr, 
  |                                                     results_context_t*, 
  |                                                     bool*&) 
  |          { 
  |             return error_node(); 
  |          } 
  |          #endif 
  |  
  |          inline expression_node_ptr vector_element(const std::string&  symbol, 
  |                                                    vector_holder_ptr   vector_base, 
  |                                                    expression_node_ptr vec_node, 
  |                                                    expression_node_ptr index) 
  |          { 
  |             expression_node_ptr result = error_node(); 
  |             std::string node_name = "Unknown" 
  |  
  |             if (details::is_constant_node(index)) 
  |             { 
  |                const std::size_t vec_index = static_cast<std::size_t>(details::numeric::to_int64(index->value())); 
  |  
  |                details::free_node(*node_allocator_,index); 
  |  
  |                if (vec_index >= vector_base->size()) 
  |                { 
  |                   parser_->set_error(parser_error::make_error( 
  |                      parser_error::e_parser, 
  |                      token_t(), 
  |                      "ERR264 - Index of " + details::to_str(vec_index) + " out of range for " 
  |                      "vector '" + symbol + "' of size " + details::to_str(vector_base->size()), 
  |                      exprtk_error_location)); 
  |  
  |                   details::free_node(*node_allocator_,vec_node); 
  |  
  |                   return error_node(); 
  |                } 
  |  
  |                if (vector_base->rebaseable()) 
  |                { 
  |                   vector_access_runtime_check_ptr rtc = get_vector_access_runtime_check(); 
  |  
  |                   result = (rtc) ? 
  |                      node_allocator_->allocate<rebasevector_celem_rtc_node_t>(vec_node, vec_index, vector_base, rtc) : 
  |                      node_allocator_->allocate<rebasevector_celem_node_t    >(vec_node, vec_index, vector_base     ) ; 
  |  
  |                   node_name = (rtc) ? 
  |                      "rebasevector_elem_rtc_node_t" : 
  |                      "rebasevector_elem_node_t"     ; 
  |  
  |                   if (result && result->valid()) 
  |                   { 
  |                      return result; 
  |                   } 
  |  
  |                   parser_->set_error(parser_error::make_error( 
  |                      parser_error::e_synthesis, 
  |                      token_t(), 
  |                      "ERR265 - Failed to synthesize node: " + node_name + " for vector: " + symbol, 
  |                      exprtk_error_location)); 
  |  
  |                   details::free_node(*node_allocator_, result); 
  |                   return error_node(); 
  |                } 
  |                else if (details::is_ivector_node(vec_node) && !details::is_vector_node(vec_node)) 
  |                { 
  |                   vector_access_runtime_check_ptr rtc = get_vector_access_runtime_check(); 
  |  
  |                   result = (rtc) ? 
  |                      node_allocator_->allocate<vector_celem_rtc_node_t>(vec_node, vec_index, vector_base, rtc) : 
  |                      node_allocator_->allocate<vector_celem_node_t    >(vec_node, vec_index, vector_base     ) ; 
  |  
  |                   node_name = (rtc) ? 
  |                      "vector_elem_rtc_node_t" : 
  |                      "vector_elem_node_t"     ; 
  |  
  |                   if (result && result->valid()) 
  |                   { 
  |                      return result; 
  |                   } 
  |  
  |                   parser_->set_error(parser_error::make_error( 
  |                      parser_error::e_synthesis, 
  |                      token_t(), 
  |                      "ERR266 - Failed to synthesize node: " + node_name + " for vector: " + symbol, 
  |                      exprtk_error_location)); 
  |  
  |                   details::free_node(*node_allocator_, result); 
  |                   return error_node(); 
  |                } 
  |  
  |                const scope_element& se = parser_->sem_.get_element(symbol,vec_index); 
  |  
  |                if (se.index == vec_index) 
  |                { 
  |                   result = se.var_node; 
  |                   details::free_node(*node_allocator_,vec_node); 
  |                } 
  |                else 
  |                { 
  |                   scope_element nse; 
  |                   nse.name      = symbol; 
  |                   nse.active    = true; 
  |                   nse.ref_count = 1; 
  |                   nse.type      = scope_element::e_vecelem; 
  |                   nse.index     = vec_index; 
  |                   nse.depth     = parser_->state_.scope_depth; 
  |                   nse.data      = 0; 
  |                   nse.var_node  = node_allocator_->allocate<variable_node_t>((*(*vector_base)[vec_index])); 
  |  
  |                   if (!parser_->sem_.add_element(nse)) 
  |                   { 
  |                      parser_->set_synthesis_error("Failed to add new local vector element to SEM [1]"); 
  |  
  |                      parser_->sem_.free_element(nse); 
  |  
  |                      result = error_node(); 
  |                   } 
  |  
  |                   details::free_node(*node_allocator_,vec_node); 
  |  
  |                   exprtk_debug(("vector_element() - INFO - Added new local vector element: %s\n", nse.name.c_str())); 
  |  
  |                   parser_->state_.activate_side_effect("vector_element()"); 
  |  
  |                   result = nse.var_node; 
  |                   node_name = "variable_node_t" 
  |                } 
  |             } 
  |             else 
  |             { 
  |                vector_access_runtime_check_ptr rtc = get_vector_access_runtime_check(); 
  |  
  |                if (vector_base->rebaseable()) 
  |                { 
  |                   result = (rtc) ? 
  |                      node_allocator_->allocate<rebasevector_elem_rtc_node_t>(vec_node, index, vector_base, rtc) : 
  |                      node_allocator_->allocate<rebasevector_elem_node_t    >(vec_node, index, vector_base     ) ; 
  |  
  |                   node_name = (rtc) ? 
  |                      "rebasevector_elem_rtc_node_t" : 
  |                      "rebasevector_elem_node_t"     ; 
  |                } 
  |                else 
  |                { 
  |                   result = rtc ? 
  |                      node_allocator_->allocate<vector_elem_rtc_node_t>(vec_node, index, vector_base, rtc) : 
  |                      node_allocator_->allocate<vector_elem_node_t    >(vec_node, index, vector_base     ) ; 
  |  
  |                   node_name = (rtc) ? 
  |                      "vector_elem_rtc_node_t" : 
  |                      "vector_elem_node_t"     ; 
  |                } 
  |             } 
  |  
  |             if (result && result->valid()) 
  |             { 
  |                return result; 
  |             } 
  |  
  |             parser_->set_error(parser_error::make_error( 
  |                parser_error::e_synthesis, 
  |                token_t(), 
  |                "ERR267 - Failed to synthesize node: " + node_name, 
  |                exprtk_error_location)); 
  |  
  |             details::free_node(*node_allocator_, result); 
  |             return error_node(); 
  |          } 
  |  
  |       private: 
  |  
  |          template <std::size_t N, typename NodePtr> 
  |          inline bool is_constant_foldable(NodePtr (&b)[N]) const 
  |          { 
  |             for (std::size_t i = 0; i < N; ++i) 
  |             { 
  |                if (0 == b[i]) 
  |                   return false; 
  |                else if (!details::is_constant_node(b[i])) 
  |                   return false; 
  |             } 
  |  
  |             return true; 
  |          } 
  |  
  |          template <typename NodePtr, 
  |                    typename Allocator, 
  |                    template <typename, typename> class Sequence> 
  |          inline bool is_constant_foldable(const Sequence<NodePtr,Allocator>& b) const 
  |          { 
  |             for (std::size_t i = 0; i < b.size(); ++i) 
  |             { 
  |                if (0 == b[i]) 
  |                   return false; 
  |                else if (!details::is_constant_node(b[i])) 
  |                   return false; 
  |             } 
  |  
  |             return true; 
  |          } 
  |  
  |          void lodge_assignment(symbol_type cst, expression_node_ptr node) 
  |          { 
  |             parser_->state_.activate_side_effect("lodge_assignment()"); 
  |  
  |             if (!parser_->dec_.collect_assignments()) 
  |                return; 
  |  
  |             std::string symbol_name; 
  |  
  |             switch (cst) 
  |             { 
  |                case e_st_variable : symbol_name = parser_->symtab_store_ 
  |                                                      .get_variable_name(node); 
  |                                     break; 
  |  
  |                #ifndef exprtk_disable_string_capabilities 
  |                case e_st_string   : symbol_name = parser_->symtab_store_ 
  |                                                      .get_stringvar_name(node); 
  |                                     break; 
  |                #endif 
  |  
  |                case e_st_vector   : { 
  |                                        typedef details::vector_holder<T> vector_holder_t; 
  |  
  |                                        vector_holder_t& vh = static_cast<vector_node_t*>(node)->vec_holder(); 
  |  
  |                                        symbol_name = parser_->symtab_store_.get_vector_name(&vh); 
  |                                     } 
  |                                     break; 
  |  
  |                case e_st_vecelem  : { 
  |                                        typedef details::vector_holder<T> vector_holder_t; 
  |  
  |                                        vector_holder_t& vh = static_cast<vector_elem_node_t*>(node)->vec_holder(); 
  |  
  |                                        symbol_name = parser_->symtab_store_.get_vector_name(&vh); 
  |  
  |                                        cst = e_st_vector; 
  |                                     } 
  |                                     break; 
  |  
  |                default            : return; 
  |             } 
  |  
  |             if (!symbol_name.empty()) 
  |             { 
  |                parser_->dec_.add_assignment(symbol_name,cst); 
  |             } 
  |          } 
  |  
  |          const void* base_ptr(expression_node_ptr node) 
  |          { 
  |             if (node) 
  |             { 
  |                switch(node->type()) 
  |                { 
  |                   case details::expression_node<T>::e_variable: 
  |                      return reinterpret_cast<const void*>(&static_cast<variable_node_t*>(node)->ref()); 
  |  
  |                   case details::expression_node<T>::e_vecelem: 
  |                      return reinterpret_cast<const void*>(&static_cast<vector_elem_node_t*>(node)->ref()); 
  |  
  |                   case details::expression_node<T>::e_veccelem: 
  |                      return reinterpret_cast<const void*>(&static_cast<vector_celem_node_t*>(node)->ref()); 
  |  
  |                   case details::expression_node<T>::e_vecelemrtc: 
  |                      return reinterpret_cast<const void*>(&static_cast<vector_elem_rtc_node_t*>(node)->ref()); 
  |  
  |                   case details::expression_node<T>::e_veccelemrtc: 
  |                      return reinterpret_cast<const void*>(&static_cast<vector_celem_rtc_node_t*>(node)->ref()); 
  |  
  |                   case details::expression_node<T>::e_rbvecelem: 
  |                      return reinterpret_cast<const void*>(&static_cast<rebasevector_elem_node_t*>(node)->ref()); 
  |  
  |                   case details::expression_node<T>::e_rbvecelemrtc: 
  |                      return reinterpret_cast<const void*>(&static_cast<rebasevector_elem_rtc_node_t*>(node)->ref()); 
  |  
  |                   case details::expression_node<T>::e_rbveccelem: 
  |                      return reinterpret_cast<const void*>(&static_cast<rebasevector_celem_node_t*>(node)->ref()); 
  |  
  |                   case details::expression_node<T>::e_rbveccelemrtc: 
  |                      return reinterpret_cast<const void*>(&static_cast<rebasevector_celem_rtc_node_t*>(node)->ref()); 
  |  
  |                   case details::expression_node<T>::e_vector: 
  |                      return reinterpret_cast<const void*>(static_cast<vector_node_t*>(node)->vec_holder().data()); 
  |  
  |                   #ifndef exprtk_disable_string_capabilities 
  |                   case details::expression_node<T>::e_stringvar: 
  |                      return reinterpret_cast<const void*>((static_cast<stringvar_node_t*>(node)->base())); 
  |  
  |                   case details::expression_node<T>::e_stringvarrng: 
  |                      return reinterpret_cast<const void*>((static_cast<string_range_node_t*>(node)->base())); 
  |                   #endif 
  |                   default : return reinterpret_cast<const void*>(0); 
  |                } 
  |             } 
  |  
  |             return reinterpret_cast<const void*>(0); 
  |          } 
  |  
  |          bool assign_immutable_symbol(expression_node_ptr node) 
  |          { 
  |             interval_t interval; 
  |             const void* baseptr_addr = base_ptr(node); 
  |  
  |             exprtk_debug(("assign_immutable_symbol - base ptr addr: %p\n", baseptr_addr)); 
  |  
  |             if (parser_->immutable_memory_map_.in_interval(baseptr_addr,interval)) 
  |             { 
  |                typename immutable_symtok_map_t::iterator itr = parser_->immutable_symtok_map_.find(interval); 
  |  
  |                if (parser_->immutable_symtok_map_.end() != itr) 
  |                { 
  |                   token_t& token = itr->second; 
  |                   parser_->set_error(parser_error::make_error( 
  |                      parser_error::e_parser, 
  |                      token, 
  |                      "ERR268 - Symbol '" + token.value + "' cannot be assigned-to as it is immutable.", 
  |                      exprtk_error_location)); 
  |                } 
  |                else 
  |                   parser_->set_synthesis_error("Unable to assign symbol is immutable."); 
  |  
  |                return true; 
  |             } 
  |  
  |             return false; 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_assignment_expression(const details::operator_type& operation, expression_node_ptr (&branch)[2]) 
  |          { 
  |             if (assign_immutable_symbol(branch[0])) 
  |             { 
  |                return error_node(); 
  |             } 
  |             else if (details::is_variable_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_variable,branch[0]); 
  |                return synthesize_expression<assignment_node_t,2>(operation,branch); 
  |             } 
  |             else if (details::is_vector_elem_node(branch[0]) || details::is_vector_celem_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_vecelem,branch[0]); 
  |                return synthesize_expression<assignment_vec_elem_node_t, 2>(operation, branch); 
  |             } 
  |             else if (details::is_vector_elem_rtc_node(branch[0]) || details::is_vector_celem_rtc_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_vecelem,branch[0]); 
  |                return synthesize_expression<assignment_vec_elem_rtc_node_t, 2>(operation, branch); 
  |             } 
  |             else if (details::is_rebasevector_elem_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_vecelem,branch[0]); 
  |                return synthesize_expression<assignment_rebasevec_elem_node_t, 2>(operation, branch); 
  |             } 
  |             else if (details::is_rebasevector_elem_rtc_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_vecelem,branch[0]); 
  |                return synthesize_expression<assignment_rebasevec_elem_rtc_node_t, 2>(operation, branch); 
  |             } 
  |             else if (details::is_rebasevector_celem_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_vecelem,branch[0]); 
  |                return synthesize_expression<assignment_rebasevec_celem_node_t, 2>(operation, branch); 
  |             } 
  |             #ifndef exprtk_disable_string_capabilities 
  |             else if (details::is_string_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_string,branch[0]); 
  |                return synthesize_expression<assignment_string_node_t,2>(operation, branch); 
  |             } 
  |             else if (details::is_string_range_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_string,branch[0]); 
  |                return synthesize_expression<assignment_string_range_node_t,2>(operation, branch); 
  |             } 
  |             #endif 
  |             else if (details::is_vector_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_vector,branch[0]); 
  |  
  |                if (details::is_ivector_node(branch[1])) 
  |                   return synthesize_expression<assignment_vecvec_node_t,2>(operation, branch); 
  |                else 
  |                   return synthesize_expression<assignment_vec_node_t,2>(operation, branch); 
  |             } 
  |             else if (details::is_literal_node(branch[0])) 
  |             { 
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_syntax, 
  |                   parser_->current_state().token, 
  |                   "ERR269 - Cannot assign value to const variable", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |             else 
  |             { 
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_syntax, 
  |                   parser_->current_state().token, 
  |                   "ERR270 - Invalid branches for assignment operator '" + details::to_str(operation) + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_assignment_operation_expression(const details::operator_type& operation, 
  |                                                                                expression_node_ptr (&branch)[2]) 
  |          { 
  |             if (assign_immutable_symbol(branch[0])) 
  |             { 
  |                return error_node(); 
  |             } 
  |  
  |             expression_node_ptr result = error_node(); 
  |             std::string node_name = "Unknown" 
  |  
  |             if (details::is_variable_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_variable,branch[0]); 
  |  
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                                 \ 
  |                   case op0 : result = node_allocator_->                                                       \ 
  |                                 template allocate_rrr<typename details::assignment_op_node<Type,op1<Type> > > \ 
  |                                    (operation, branch[0], branch[1]);                                         \ 
  |                              node_name = "assignment_op_node"                                                \ 
  |                              break;                                                                           \ 
  |  
  |                   case_stmt(details::e_addass , details::add_op) 
  |                   case_stmt(details::e_subass , details::sub_op) 
  |                   case_stmt(details::e_mulass , details::mul_op) 
  |                   case_stmt(details::e_divass , details::div_op) 
  |                   case_stmt(details::e_modass , details::mod_op) 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |             else if (details::is_vector_elem_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_vecelem,branch[0]); 
  |  
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                                           \ 
  |                   case op0 : result = node_allocator_->                                                                 \ 
  |                                  template allocate_rrr<typename details::assignment_vec_elem_op_node<Type,op1<Type> > > \ 
  |                                     (operation, branch[0], branch[1]);                                                  \ 
  |                              node_name = "assignment_vec_elem_op_node"                                                 \ 
  |                              break;                                                                                     \ 
  |  
  |                   case_stmt(details::e_addass , details::add_op) 
  |                   case_stmt(details::e_subass , details::sub_op) 
  |                   case_stmt(details::e_mulass , details::mul_op) 
  |                   case_stmt(details::e_divass , details::div_op) 
  |                   case_stmt(details::e_modass , details::mod_op) 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |             else if (details::is_vector_elem_rtc_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_vecelem,branch[0]); 
  |  
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                                               \ 
  |                   case op0 : result = node_allocator_->                                                                     \ 
  |                                  template allocate_rrr<typename details::assignment_vec_elem_op_rtc_node<Type,op1<Type> > > \ 
  |                                     (operation, branch[0], branch[1]);                                                      \ 
  |                              node_name = "assignment_vec_elem_op_rtc_node"                                                 \ 
  |                              break;                                                                                         \ 
  |  
  |                   case_stmt(details::e_addass , details::add_op) 
  |                   case_stmt(details::e_subass , details::sub_op) 
  |                   case_stmt(details::e_mulass , details::mul_op) 
  |                   case_stmt(details::e_divass , details::div_op) 
  |                   case_stmt(details::e_modass , details::mod_op) 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |             else if (details::is_vector_celem_rtc_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_vecelem,branch[0]); 
  |  
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                                                \ 
  |                   case op0 : result = node_allocator_->                                                                      \ 
  |                                  template allocate_rrr<typename details::assignment_vec_celem_op_rtc_node<Type,op1<Type> > > \ 
  |                                     (operation, branch[0], branch[1]);                                                       \ 
  |                              node_name = "assignment_vec_celem_op_rtc_node"                                                 \ 
  |                              break;                                                                                          \ 
  |  
  |                   case_stmt(details::e_addass , details::add_op) 
  |                   case_stmt(details::e_subass , details::sub_op) 
  |                   case_stmt(details::e_mulass , details::mul_op) 
  |                   case_stmt(details::e_divass , details::div_op) 
  |                   case_stmt(details::e_modass , details::mod_op) 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |             else if (details::is_rebasevector_elem_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_vecelem,branch[0]); 
  |  
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                                                 \ 
  |                   case op0 : result = node_allocator_->                                                                       \ 
  |                                  template allocate_rrr<typename details::assignment_rebasevec_elem_op_node<Type,op1<Type> > > \ 
  |                                     (operation, branch[0], branch[1]);                                                        \ 
  |                              node_name = "assignment_rebasevec_elem_op_node"                                                 \ 
  |                              break;                                                                                           \ 
  |  
  |                   case_stmt(details::e_addass , details::add_op) 
  |                   case_stmt(details::e_subass , details::sub_op) 
  |                   case_stmt(details::e_mulass , details::mul_op) 
  |                   case_stmt(details::e_divass , details::div_op) 
  |                   case_stmt(details::e_modass , details::mod_op) 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |             else if (details::is_rebasevector_celem_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_vecelem,branch[0]); 
  |  
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                                                  \ 
  |                   case op0 : result = node_allocator_->                                                                        \ 
  |                                  template allocate_rrr<typename details::assignment_rebasevec_celem_op_node<Type,op1<Type> > > \ 
  |                                     (operation, branch[0], branch[1]);                                                         \ 
  |                              node_name = "assignment_rebasevec_celem_op_node"                                                 \ 
  |                              break;                                                                                            \ 
  |  
  |                   case_stmt(details::e_addass , details::add_op) 
  |                   case_stmt(details::e_subass , details::sub_op) 
  |                   case_stmt(details::e_mulass , details::mul_op) 
  |                   case_stmt(details::e_divass , details::div_op) 
  |                   case_stmt(details::e_modass , details::mod_op) 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |             else if (details::is_rebasevector_elem_rtc_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_vecelem,branch[0]); 
  |  
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                                                     \ 
  |                   case op0 : result = node_allocator_->                                                                           \ 
  |                                  template allocate_rrr<typename details::assignment_rebasevec_elem_op_rtc_node<Type,op1<Type> > > \ 
  |                                     (operation, branch[0], branch[1]);                                                            \ 
  |                              node_name = "assignment_rebasevec_elem_op_rtc_node"                                                 \ 
  |                              break;                                                                                               \ 
  |  
  |                   case_stmt(details::e_addass , details::add_op) 
  |                   case_stmt(details::e_subass , details::sub_op) 
  |                   case_stmt(details::e_mulass , details::mul_op) 
  |                   case_stmt(details::e_divass , details::div_op) 
  |                   case_stmt(details::e_modass , details::mod_op) 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |             else if (details::is_rebasevector_celem_rtc_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_vecelem,branch[0]); 
  |  
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                                                      \ 
  |                   case op0 : result = node_allocator_->                                                                            \ 
  |                                  template allocate_rrr<typename details::assignment_rebasevec_celem_op_rtc_node<Type,op1<Type> > > \ 
  |                                     (operation, branch[0], branch[1]);                                                             \ 
  |                              node_name = "assignment_rebasevec_celem_op_rtc_node"                                                 \ 
  |                              break;                                                                                                \ 
  |  
  |                   case_stmt(details::e_addass , details::add_op) 
  |                   case_stmt(details::e_subass , details::sub_op) 
  |                   case_stmt(details::e_mulass , details::mul_op) 
  |                   case_stmt(details::e_divass , details::div_op) 
  |                   case_stmt(details::e_modass , details::mod_op) 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |             else if (details::is_vector_node(branch[0])) 
  |             { 
  |                lodge_assignment(e_st_vector,branch[0]); 
  |  
  |                if (details::is_ivector_node(branch[1])) 
  |                { 
  |                   switch (operation) 
  |                   { 
  |                      #define case_stmt(op0, op1)                                                                        \ 
  |                      case op0 : result = node_allocator_->                                                              \ 
  |                                    template allocate_rrr<typename details::assignment_vecvec_op_node<Type,op1<Type> > > \ 
  |                                       (operation, branch[0], branch[1]);                                                \ 
  |                                 node_name = "assignment_rebasevec_celem_op_node"                                       \ 
  |                                 break;                                                                                  \ 
  |  
  |                      case_stmt(details::e_addass , details::add_op) 
  |                      case_stmt(details::e_subass , details::sub_op) 
  |                      case_stmt(details::e_mulass , details::mul_op) 
  |                      case_stmt(details::e_divass , details::div_op) 
  |                      case_stmt(details::e_modass , details::mod_op) 
  |                      #undef case_stmt 
  |                      default : return error_node(); 
  |                   } 
  |                } 
  |                else 
  |                { 
  |                   switch (operation) 
  |                   { 
  |                      #define case_stmt(op0, op1)                                                                     \ 
  |                      case op0 : result = node_allocator_->                                                           \ 
  |                                    template allocate_rrr<typename details::assignment_vec_op_node<Type,op1<Type> > > \ 
  |                                       (operation, branch[0], branch[1]);                                             \ 
  |                                 node_name = "assignment_vec_op_node"                                                \ 
  |                                 break;                                                                               \ 
  |  
  |                      case_stmt(details::e_addass , details::add_op) 
  |                      case_stmt(details::e_subass , details::sub_op) 
  |                      case_stmt(details::e_mulass , details::mul_op) 
  |                      case_stmt(details::e_divass , details::div_op) 
  |                      case_stmt(details::e_modass , details::mod_op) 
  |                      #undef case_stmt 
  |                      default : return error_node(); 
  |                   } 
  |                } 
  |             } 
  |             #ifndef exprtk_disable_string_capabilities 
  |             else if ( 
  |                       (details::e_addass == operation) && 
  |                       details::is_string_node(branch[0]) 
  |                     ) 
  |             { 
  |                typedef details::assignment_string_node<T,details::asn_addassignment> addass_t; 
  |  
  |                lodge_assignment(e_st_string,branch[0]); 
  |  
  |                result = synthesize_expression<addass_t,2>(operation,branch); 
  |                node_name = "assignment_string_node<T,details::asn_addassignment>" 
  |             } 
  |             #endif 
  |             else 
  |             { 
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_syntax, 
  |                   parser_->current_state().token, 
  |                   "ERR271 - Invalid branches for assignment operator '" + details::to_str(operation) + "'", 
  |                   exprtk_error_location)); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             if (result && result->valid()) 
  |             { 
  |                return result; 
  |             } 
  |  
  |             parser_->set_error(parser_error::make_error( 
  |                parser_error::e_synthesis, 
  |                token_t(), 
  |                "ERR272 - Failed to synthesize node: " + node_name, 
  |                exprtk_error_location)); 
  |  
  |             details::free_node(*node_allocator_, result); 
  |             return error_node(); 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_veceqineqlogic_operation_expression(const details::operator_type& operation, 
  |                                                                                    expression_node_ptr (&branch)[2]) 
  |          { 
  |             const bool is_b0_ivec = details::is_ivector_node(branch[0]); 
  |             const bool is_b1_ivec = details::is_ivector_node(branch[1]); 
  |  
  |             #define batch_eqineq_logic_case                 \ 
  |             case_stmt(details::e_lt    , details::lt_op   ) \ 
  |             case_stmt(details::e_lte   , details::lte_op  ) \ 
  |             case_stmt(details::e_gt    , details::gt_op   ) \ 
  |             case_stmt(details::e_gte   , details::gte_op  ) \ 
  |             case_stmt(details::e_eq    , details::eq_op   ) \ 
  |             case_stmt(details::e_ne    , details::ne_op   ) \ 
  |             case_stmt(details::e_equal , details::equal_op) \ 
  |             case_stmt(details::e_and   , details::and_op  ) \ 
  |             case_stmt(details::e_nand  , details::nand_op ) \ 
  |             case_stmt(details::e_or    , details::or_op   ) \ 
  |             case_stmt(details::e_nor   , details::nor_op  ) \ 
  |             case_stmt(details::e_xor   , details::xor_op  ) \ 
  |             case_stmt(details::e_xnor  , details::xnor_op ) \ 
  |  
  |             expression_node_ptr result = error_node(); 
  |             std::string node_name = "Unknown" 
  |  
  |             if (is_b0_ivec && is_b1_ivec) 
  |             { 
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                                    \ 
  |                   case op0 : result = node_allocator_->                                                          \ 
  |                                 template allocate_rrr<typename details::vec_binop_vecvec_node<Type,op1<Type> > > \ 
  |                                    (operation, branch[0], branch[1]);                                            \ 
  |                              node_name = "vec_binop_vecvec_node"                                                \ 
  |                              break;                                                                              \ 
  |  
  |                   batch_eqineq_logic_case 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |             else if (is_b0_ivec && !is_b1_ivec) 
  |             { 
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                                    \ 
  |                   case op0 : result = node_allocator_->                                                          \ 
  |                                 template allocate_rrr<typename details::vec_binop_vecval_node<Type,op1<Type> > > \ 
  |                                    (operation, branch[0], branch[1]);                                            \ 
  |                              node_name = "vec_binop_vecval_node"                                                \ 
  |                              break;                                                                              \ 
  |  
  |                   batch_eqineq_logic_case 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |             else if (!is_b0_ivec && is_b1_ivec) 
  |             { 
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                                    \ 
  |                   case op0 : result = node_allocator_->                                                          \ 
  |                                 template allocate_rrr<typename details::vec_binop_valvec_node<Type,op1<Type> > > \ 
  |                                    (operation, branch[0], branch[1]);                                            \ 
  |                              node_name = "vec_binop_valvec_node"                                                \ 
  |                              break;                                                                              \ 
  |  
  |                   batch_eqineq_logic_case 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |             else 
  |                return error_node(); 
  |  
  |             if (result && result->valid()) 
  |             { 
  |                return result; 
  |             } 
  |  
  |             parser_->set_error(parser_error::make_error( 
  |                parser_error::e_synthesis, 
  |                token_t(), 
  |                "ERR273 - Failed to synthesize node: " + node_name, 
  |                exprtk_error_location)); 
  |  
  |             details::free_node(*node_allocator_, result); 
  |             return error_node(); 
  |  
  |             #undef batch_eqineq_logic_case 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_vecarithmetic_operation_expression(const details::operator_type& operation, 
  |                                                                                   expression_node_ptr (&branch)[2]) 
  |          { 
  |             const bool is_b0_ivec = details::is_ivector_node(branch[0]); 
  |             const bool is_b1_ivec = details::is_ivector_node(branch[1]); 
  |  
  |             #define vector_ops                          \ 
  |             case_stmt(details::e_add , details::add_op) \ 
  |             case_stmt(details::e_sub , details::sub_op) \ 
  |             case_stmt(details::e_mul , details::mul_op) \ 
  |             case_stmt(details::e_div , details::div_op) \ 
  |             case_stmt(details::e_mod , details::mod_op) \ 
  |  
  |             expression_node_ptr result = error_node(); 
  |             std::string node_name = "Unknown" 
  |  
  |             if (is_b0_ivec && is_b1_ivec) 
  |             { 
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                                    \ 
  |                   case op0 : result = node_allocator_->                                                          \ 
  |                                 template allocate_rrr<typename details::vec_binop_vecvec_node<Type,op1<Type> > > \ 
  |                                    (operation, branch[0], branch[1]);                                            \ 
  |                              node_name = "vec_binop_vecvec_node"                                                \ 
  |                              break;                                                                              \ 
  |  
  |                   vector_ops 
  |                   case_stmt(details::e_pow,details:: pow_op) 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |             else if (is_b0_ivec && !is_b1_ivec) 
  |             { 
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                                    \ 
  |                   case op0 : result = node_allocator_->                                                          \ 
  |                                 template allocate_rrr<typename details::vec_binop_vecval_node<Type,op1<Type> > > \ 
  |                                    (operation, branch[0], branch[1]);                                            \ 
  |                              node_name = "vec_binop_vecval_node(b0ivec,!b1ivec)"                                \ 
  |                              break;                                                                              \ 
  |  
  |                   vector_ops 
  |                   case_stmt(details::e_pow,details:: pow_op) 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |             else if (!is_b0_ivec && is_b1_ivec) 
  |             { 
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                                    \ 
  |                   case op0 : result = node_allocator_->                                                          \ 
  |                                 template allocate_rrr<typename details::vec_binop_valvec_node<Type,op1<Type> > > \ 
  |                                    (operation, branch[0], branch[1]);                                            \ 
  |                              node_name = "vec_binop_vecval_node(!b0ivec,b1ivec)"                                \ 
  |                              break;                                                                              \ 
  |  
  |                   vector_ops 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |             else 
  |                return error_node(); 
  |  
  |             if (result && result->valid()) 
  |             { 
  |                return result; 
  |             } 
  |  
  |             parser_->set_error(parser_error::make_error( 
  |                parser_error::e_synthesis, 
  |                token_t(), 
  |                "ERR274 - Failed to synthesize node: " + node_name, 
  |                exprtk_error_location)); 
  |  
  |             details::free_node(*node_allocator_, result); 
  |             return error_node(); 
  |  
  |             #undef vector_ops 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_swap_expression(expression_node_ptr (&branch)[2]) 
  |          { 
  |             const bool v0_is_ivar = details::is_ivariable_node(branch[0]); 
  |             const bool v1_is_ivar = details::is_ivariable_node(branch[1]); 
  |  
  |             const bool v0_is_ivec = details::is_ivector_node  (branch[0]); 
  |             const bool v1_is_ivec = details::is_ivector_node  (branch[1]); 
  |  
  |             #ifndef exprtk_disable_string_capabilities 
  |             const bool v0_is_str = details::is_generally_string_node(branch[0]); 
  |             const bool v1_is_str = details::is_generally_string_node(branch[1]); 
  |             #endif 
  |  
  |             expression_node_ptr result = error_node(); 
  |             std::string node_name      = "Unknown" 
  |  
  |             if (v0_is_ivar && v1_is_ivar) 
  |             { 
  |                typedef details::variable_node<T>* variable_node_ptr; 
  |  
  |                variable_node_ptr v0 = variable_node_ptr(0); 
  |                variable_node_ptr v1 = variable_node_ptr(0); 
  |  
  |                if ( 
  |                     (0 != (v0 = dynamic_cast<variable_node_ptr>(branch[0]))) && 
  |                     (0 != (v1 = dynamic_cast<variable_node_ptr>(branch[1]))) 
  |                   ) 
  |                { 
  |                   result    = node_allocator_->allocate<details::swap_node<T> >(v0,v1); 
  |                   node_name = "swap_node" 
  |                } 
  |                else 
  |                { 
  |                   result    = node_allocator_->allocate<details::swap_generic_node<T> >(branch[0],branch[1]); 
  |                   node_name = "swap_generic_node" 
  |                } 
  |             } 
  |             else if (v0_is_ivec && v1_is_ivec) 
  |             { 
  |                result    = node_allocator_->allocate<details::swap_vecvec_node<T> >(branch[0],branch[1]); 
  |                node_name = "swap_vecvec_node" 
  |             } 
  |             #ifndef exprtk_disable_string_capabilities 
  |             else if (v0_is_str && v1_is_str) 
  |             { 
  |                if (is_string_node(branch[0]) && is_string_node(branch[1])) 
  |                { 
  |                   result = node_allocator_->allocate<details::swap_string_node<T> > 
  |                                                (branch[0], branch[1]); 
  |                   node_name = "swap_string_node" 
  |                } 
  |                else 
  |                { 
  |                   result = node_allocator_->allocate<details::swap_genstrings_node<T> > 
  |                                                (branch[0], branch[1]); 
  |                   node_name = "swap_genstrings_node" 
  |                } 
  |             } 
  |             #endif 
  |             else 
  |             { 
  |                parser_->set_synthesis_error("Only variables, strings, vectors or vector elements can be swapped"); 
  |                return error_node(); 
  |             } 
  |  
  |             if (result && result->valid()) 
  |             { 
  |                parser_->state_.activate_side_effect("synthesize_swap_expression()"); 
  |                return result; 
  |             } 
  |  
  |             parser_->set_error(parser_error::make_error( 
  |                parser_error::e_synthesis, 
  |                token_t(), 
  |                "ERR275 - Failed to synthesize node: " + node_name, 
  |                exprtk_error_location)); 
  |  
  |             details::free_node(*node_allocator_, result); 
  |             return error_node(); 
  |          } 
  |  
  |          #ifndef exprtk_disable_sc_andor 
  |          inline expression_node_ptr synthesize_shortcircuit_expression(const details::operator_type& operation, expression_node_ptr (&branch)[2]) 
  |          { 
  |             expression_node_ptr result = error_node(); 
  |  
  |             if (details::is_constant_node(branch[0])) 
  |             { 
  |                if ( 
  |                     (details::e_scand == operation) && 
  |                     std::equal_to<T>()(T(0),branch[0]->value()) 
  |                   ) 
  |                   result = node_allocator_->allocate_c<literal_node_t>(T(0)); 
  |                else if ( 
  |                          (details::e_scor == operation) && 
  |                          std::not_equal_to<T>()(T(0),branch[0]->value()) 
  |                        ) 
  |                   result = node_allocator_->allocate_c<literal_node_t>(T(1)); 
  |             } 
  |  
  |             if (details::is_constant_node(branch[1]) && (0 == result)) 
  |             { 
  |                if ( 
  |                     (details::e_scand == operation) && 
  |                     std::equal_to<T>()(T(0),branch[1]->value()) 
  |                   ) 
  |                   result = node_allocator_->allocate_c<literal_node_t>(T(0)); 
  |                else if ( 
  |                          (details::e_scor == operation) && 
  |                          std::not_equal_to<T>()(T(0),branch[1]->value()) 
  |                        ) 
  |                   result = node_allocator_->allocate_c<literal_node_t>(T(1)); 
  |             } 
  |  
  |             if (result) 
  |             { 
  |                details::free_node(*node_allocator_, branch[0]); 
  |                details::free_node(*node_allocator_, branch[1]); 
  |  
  |                return result; 
  |             } 
  |             else if (details::e_scand == operation) 
  |             { 
  |                return synthesize_expression<scand_node_t,2>(operation, branch); 
  |             } 
  |             else if (details::e_scor == operation) 
  |             { 
  |                return synthesize_expression<scor_node_t,2>(operation, branch); 
  |             } 
  |             else 
  |                return error_node(); 
  |          } 
  |          #else 
  |          inline expression_node_ptr synthesize_shortcircuit_expression(const details::operator_type&, expression_node_ptr (&)[2]) 
  |          { 
  |             return error_node(); 
  |          } 
  |          #endif 
  |  
  |          #define basic_opr_switch_statements         \ 
  |          case_stmt(details::e_add , details::add_op) \ 
  |          case_stmt(details::e_sub , details::sub_op) \ 
  |          case_stmt(details::e_mul , details::mul_op) \ 
  |          case_stmt(details::e_div , details::div_op) \ 
  |          case_stmt(details::e_mod , details::mod_op) \ 
  |          case_stmt(details::e_pow , details::pow_op) \ 
  |  
  |          #define extended_opr_switch_statements        \ 
  |          case_stmt(details::e_lt   , details::lt_op  ) \ 
  |          case_stmt(details::e_lte  , details::lte_op ) \ 
  |          case_stmt(details::e_gt   , details::gt_op  ) \ 
  |          case_stmt(details::e_gte  , details::gte_op ) \ 
  |          case_stmt(details::e_eq   , details::eq_op  ) \ 
  |          case_stmt(details::e_ne   , details::ne_op  ) \ 
  |          case_stmt(details::e_and  , details::and_op ) \ 
  |          case_stmt(details::e_nand , details::nand_op) \ 
  |          case_stmt(details::e_or   , details::or_op  ) \ 
  |          case_stmt(details::e_nor  , details::nor_op ) \ 
  |          case_stmt(details::e_xor  , details::xor_op ) \ 
  |          case_stmt(details::e_xnor , details::xnor_op) \ 
  |  
  |          #ifndef exprtk_disable_cardinal_pow_optimisation 
  |          template <typename TType, template <typename, typename> class IPowNode> 
  |          inline expression_node_ptr cardinal_pow_optimisation_impl(const TType& v, const unsigned int& p) 
  |          { 
  |             switch (p) 
  |             { 
  |                #define case_stmt(cp)                                                     \ 
  |                case cp : return node_allocator_->                                        \ 
  |                             allocate<IPowNode<T,details::numeric::fast_exp<T,cp> > >(v); \ 
  |  
  |                case_stmt( 1) case_stmt( 2) case_stmt( 3) case_stmt( 4) 
  |                case_stmt( 5) case_stmt( 6) case_stmt( 7) case_stmt( 8) 
  |                case_stmt( 9) case_stmt(10) case_stmt(11) case_stmt(12) 
  |                case_stmt(13) case_stmt(14) case_stmt(15) case_stmt(16) 
  |                case_stmt(17) case_stmt(18) case_stmt(19) case_stmt(20) 
  |                case_stmt(21) case_stmt(22) case_stmt(23) case_stmt(24) 
  |                case_stmt(25) case_stmt(26) case_stmt(27) case_stmt(28) 
  |                case_stmt(29) case_stmt(30) case_stmt(31) case_stmt(32) 
  |                case_stmt(33) case_stmt(34) case_stmt(35) case_stmt(36) 
  |                case_stmt(37) case_stmt(38) case_stmt(39) case_stmt(40) 
  |                case_stmt(41) case_stmt(42) case_stmt(43) case_stmt(44) 
  |                case_stmt(45) case_stmt(46) case_stmt(47) case_stmt(48) 
  |                case_stmt(49) case_stmt(50) case_stmt(51) case_stmt(52) 
  |                case_stmt(53) case_stmt(54) case_stmt(55) case_stmt(56) 
  |                case_stmt(57) case_stmt(58) case_stmt(59) case_stmt(60) 
  |                #undef case_stmt 
  |                default : return error_node(); 
  |             } 
  |          } 
  |  
  |          inline expression_node_ptr cardinal_pow_optimisation(const T& v, const T& c) 
  |          { 
  |             const bool not_recipricol = (c >= T(0)); 
  |             const unsigned int p = static_cast<unsigned int>(details::numeric::to_int32(details::numeric::abs(c))); 
  |  
  |             if (0 == p) 
  |                return node_allocator_->allocate_c<literal_node_t>(T(1)); 
  |             else if (std::equal_to<T>()(T(2),c)) 
  |             { 
  |                return node_allocator_-> 
  |                   template allocate_rr<typename details::vov_node<Type,details::mul_op<Type> > >(v,v); 
  |             } 
  |             else 
  |             { 
  |                if (not_recipricol) 
  |                   return cardinal_pow_optimisation_impl<T,details::ipow_node>(v,p); 
  |                else 
  |                   return cardinal_pow_optimisation_impl<T,details::ipowinv_node>(v,p); 
  |             } 
  |          } 
  |  
  |          inline bool cardinal_pow_optimisable(const details::operator_type& operation, const T& c) const 
  |          { 
  |             return (details::e_pow == operation) && (details::numeric::abs(c) <= T(60)) && details::numeric::is_integer(c); 
  |          } 
  |  
  |          inline expression_node_ptr cardinal_pow_optimisation(expression_node_ptr (&branch)[2]) 
  |          { 
  |             const Type c = static_cast<details::literal_node<Type>*>(branch[1])->value(); 
  |             const bool not_recipricol = (c >= T(0)); 
  |             const unsigned int p = static_cast<unsigned int>(details::numeric::to_int32(details::numeric::abs(c))); 
  |  
  |             node_allocator_->free(branch[1]); 
  |  
  |             if (0 == p) 
  |             { 
  |                details::free_all_nodes(*node_allocator_, branch); 
  |  
  |                return node_allocator_->allocate_c<literal_node_t>(T(1)); 
  |             } 
  |             else if (not_recipricol) 
  |                return cardinal_pow_optimisation_impl<expression_node_ptr,details::bipow_node>(branch[0],p); 
  |             else 
  |                return cardinal_pow_optimisation_impl<expression_node_ptr,details::bipowinv_node>(branch[0],p); 
  |          } 
  |          #else 
  |          inline expression_node_ptr cardinal_pow_optimisation(T&, const T&) 
  |          { 
  |             return error_node(); 
  |          } 
  |  
  |          inline bool cardinal_pow_optimisable(const details::operator_type&, const T&) 
  |          { 
  |             return false; 
  |          } 
  |  
  |          inline expression_node_ptr cardinal_pow_optimisation(expression_node_ptr(&)[2]) 
  |          { 
  |             return error_node(); 
  |          } 
  |          #endif 
  |  
  |          struct synthesize_binary_ext_expression 
  |          { 
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                const bool left_neg  = is_neg_unary_node(branch[0]); 
  |                const bool right_neg = is_neg_unary_node(branch[1]); 
  |  
  |                if (left_neg && right_neg) 
  |                { 
  |                   if ( 
  |                        (details::e_add == operation) || 
  |                        (details::e_sub == operation) || 
  |                        (details::e_mul == operation) || 
  |                        (details::e_div == operation) 
  |                      ) 
  |                   { 
  |                      if ( 
  |                           !expr_gen.parser_->simplify_unary_negation_branch(branch[0]) || 
  |                           !expr_gen.parser_->simplify_unary_negation_branch(branch[1]) 
  |                         ) 
  |                      { 
  |                         details::free_all_nodes(*expr_gen.node_allocator_,branch); 
  |  
  |                         return error_node(); 
  |                      } 
  |                   } 
  |  
  |                   switch (operation) 
  |                   { 
  |                                            // -f(x + 1) + -g(y + 1) --> -(f(x + 1) + g(y + 1)) 
  |                      case details::e_add : return expr_gen(details::e_neg, 
  |                                               expr_gen.node_allocator_-> 
  |                                                  template allocate<typename details::binary_ext_node<Type,details::add_op<Type> > > 
  |                                                     (branch[0],branch[1])); 
  |  
  |                                            // -f(x + 1) - -g(y + 1) --> g(y + 1) - f(x + 1) 
  |                      case details::e_sub : return expr_gen.node_allocator_-> 
  |                                               template allocate<typename details::binary_ext_node<Type,details::sub_op<Type> > > 
  |                                                  (branch[1],branch[0]); 
  |  
  |                      default             : break; 
  |                   } 
  |                } 
  |                else if (left_neg && !right_neg) 
  |                { 
  |                   if ( 
  |                        (details::e_add == operation) || 
  |                        (details::e_sub == operation) || 
  |                        (details::e_mul == operation) || 
  |                        (details::e_div == operation) 
  |                      ) 
  |                   { 
  |                      if (!expr_gen.parser_->simplify_unary_negation_branch(branch[0])) 
  |                      { 
  |                         details::free_all_nodes(*expr_gen.node_allocator_,branch); 
  |  
  |                         return error_node(); 
  |                      } 
  |  
  |                      switch (operation) 
  |                      { 
  |                                               // -f(x + 1) + g(y + 1) --> g(y + 1) - f(x + 1) 
  |                         case details::e_add : return expr_gen.node_allocator_-> 
  |                                                  template allocate<typename details::binary_ext_node<Type,details::sub_op<Type> > > 
  |                                                    (branch[1], branch[0]); 
  |  
  |                                               // -f(x + 1) - g(y + 1) --> -(f(x + 1) + g(y + 1)) 
  |                         case details::e_sub : return expr_gen(details::e_neg, 
  |                                                  expr_gen.node_allocator_-> 
  |                                                     template allocate<typename details::binary_ext_node<Type,details::add_op<Type> > > 
  |                                                        (branch[0], branch[1])); 
  |  
  |                                               // -f(x + 1) * g(y + 1) --> -(f(x + 1) * g(y + 1)) 
  |                         case details::e_mul : return expr_gen(details::e_neg, 
  |                                                  expr_gen.node_allocator_-> 
  |                                                     template allocate<typename details::binary_ext_node<Type,details::mul_op<Type> > > 
  |                                                        (branch[0], branch[1])); 
  |  
  |                                               // -f(x + 1) / g(y + 1) --> -(f(x + 1) / g(y + 1)) 
  |                         case details::e_div : return expr_gen(details::e_neg, 
  |                                                  expr_gen.node_allocator_-> 
  |                                                     template allocate<typename details::binary_ext_node<Type,details::div_op<Type> > > 
  |                                                        (branch[0], branch[1])); 
  |  
  |                         default             : return error_node(); 
  |                      } 
  |                   } 
  |                } 
  |                else if (!left_neg && right_neg) 
  |                { 
  |                   if ( 
  |                        (details::e_add == operation) || 
  |                        (details::e_sub == operation) || 
  |                        (details::e_mul == operation) || 
  |                        (details::e_div == operation) 
  |                      ) 
  |                   { 
  |                      if (!expr_gen.parser_->simplify_unary_negation_branch(branch[1])) 
  |                      { 
  |                         details::free_all_nodes(*expr_gen.node_allocator_,branch); 
  |  
  |                         return error_node(); 
  |                      } 
  |  
  |                      switch (operation) 
  |                      { 
  |                                               // f(x + 1) + -g(y + 1) --> f(x + 1) - g(y + 1) 
  |                         case details::e_add : return expr_gen.node_allocator_-> 
  |                                                  template allocate<typename details::binary_ext_node<Type,details::sub_op<Type> > > 
  |                                                    (branch[0], branch[1]); 
  |  
  |                                               // f(x + 1) - - g(y + 1) --> f(x + 1) + g(y + 1) 
  |                         case details::e_sub : return expr_gen.node_allocator_-> 
  |                                                  template allocate<typename details::binary_ext_node<Type,details::add_op<Type> > > 
  |                                                    (branch[0], branch[1]); 
  |  
  |                                               // f(x + 1) * -g(y + 1) --> -(f(x + 1) * g(y + 1)) 
  |                         case details::e_mul : return expr_gen(details::e_neg, 
  |                                                  expr_gen.node_allocator_-> 
  |                                                     template allocate<typename details::binary_ext_node<Type,details::mul_op<Type> > > 
  |                                                        (branch[0], branch[1])); 
  |  
  |                                               // f(x + 1) / -g(y + 1) --> -(f(x + 1) / g(y + 1)) 
  |                         case details::e_div : return expr_gen(details::e_neg, 
  |                                                  expr_gen.node_allocator_-> 
  |                                                     template allocate<typename details::binary_ext_node<Type,details::div_op<Type> > > 
  |                                                        (branch[0], branch[1])); 
  |  
  |                         default             : return error_node(); 
  |                      } 
  |                   } 
  |                } 
  |  
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                          \ 
  |                   case op0 : return expr_gen.node_allocator_->                                         \ 
  |                                 template allocate<typename details::binary_ext_node<Type,op1<Type> > > \ 
  |                                    (branch[0], branch[1]);                                             \ 
  |  
  |                   basic_opr_switch_statements 
  |                   extended_opr_switch_statements 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vob_expression 
  |          { 
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                const Type& v = static_cast<details::variable_node<Type>*>(branch[0])->ref(); 
  |  
  |                #ifndef exprtk_disable_enhanced_features 
  |                if (details::is_sf3ext_node(branch[1])) 
  |                { 
  |                   expression_node_ptr result = error_node(); 
  |  
  |                   const bool synthesis_result = 
  |                      synthesize_sf4ext_expression::template compile_right<vtype> 
  |                         (expr_gen, v, operation, branch[1], result); 
  |  
  |                   if (synthesis_result) 
  |                   { 
  |                      details::free_node(*expr_gen.node_allocator_,branch[1]); 
  |                      return result; 
  |                   } 
  |                } 
  |                #endif 
  |  
  |                if ( 
  |                     (details::e_mul == operation) || 
  |                     (details::e_div == operation) 
  |                   ) 
  |                { 
  |                   if (details::is_uv_node(branch[1])) 
  |                   { 
  |                      typedef details::uv_base_node<Type>* uvbn_ptr_t; 
  |  
  |                      details::operator_type o = static_cast<uvbn_ptr_t>(branch[1])->operation(); 
  |  
  |                      if (details::e_neg == o) 
  |                      { 
  |                         const Type& v1 = static_cast<uvbn_ptr_t>(branch[1])->v(); 
  |  
  |                         details::free_node(*expr_gen.node_allocator_,branch[1]); 
  |  
  |                         switch (operation) 
  |                         { 
  |                            case details::e_mul : return expr_gen(details::e_neg, 
  |                                                     expr_gen.node_allocator_-> 
  |                                                        template allocate_rr<typename details:: 
  |                                                           vov_node<Type,details::mul_op<Type> > >(v,v1)); 
  |  
  |                            case details::e_div : return expr_gen(details::e_neg, 
  |                                                     expr_gen.node_allocator_-> 
  |                                                        template allocate_rr<typename details:: 
  |                                                           vov_node<Type,details::div_op<Type> > >(v,v1)); 
  |  
  |                            default             : break; 
  |                         } 
  |                      } 
  |                   } 
  |                } 
  |  
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                      \ 
  |                   case op0 : return expr_gen.node_allocator_->                                     \ 
  |                                 template allocate_rc<typename details::vob_node<Type,op1<Type> > > \ 
  |                                    (v, branch[1]);                                                 \ 
  |  
  |                   basic_opr_switch_statements 
  |                   extended_opr_switch_statements 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |          }; 
  |  
  |          struct synthesize_bov_expression 
  |          { 
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                const Type& v = static_cast<details::variable_node<Type>*>(branch[1])->ref(); 
  |  
  |                #ifndef exprtk_disable_enhanced_features 
  |                if (details::is_sf3ext_node(branch[0])) 
  |                { 
  |                   expression_node_ptr result = error_node(); 
  |  
  |                   const bool synthesis_result = 
  |                      synthesize_sf4ext_expression::template compile_left<vtype> 
  |                         (expr_gen, v, operation, branch[0], result); 
  |  
  |                   if (synthesis_result) 
  |                   { 
  |                      details::free_node(*expr_gen.node_allocator_, branch[0]); 
  |  
  |                      return result; 
  |                   } 
  |                } 
  |                #endif 
  |  
  |                if ( 
  |                     (details::e_add == operation) || 
  |                     (details::e_sub == operation) || 
  |                     (details::e_mul == operation) || 
  |                     (details::e_div == operation) 
  |                   ) 
  |                { 
  |                   if (details::is_uv_node(branch[0])) 
  |                   { 
  |                      typedef details::uv_base_node<Type>* uvbn_ptr_t; 
  |  
  |                      details::operator_type o = static_cast<uvbn_ptr_t>(branch[0])->operation(); 
  |  
  |                      if (details::e_neg == o) 
  |                      { 
  |                         const Type& v0 = static_cast<uvbn_ptr_t>(branch[0])->v(); 
  |  
  |                         details::free_node(*expr_gen.node_allocator_,branch[0]); 
  |  
  |                         switch (operation) 
  |                         { 
  |                            case details::e_add : return expr_gen.node_allocator_-> 
  |                                                     template allocate_rr<typename details:: 
  |                                                        vov_node<Type,details::sub_op<Type> > >(v,v0); 
  |  
  |                            case details::e_sub : return expr_gen(details::e_neg, 
  |                                                     expr_gen.node_allocator_-> 
  |                                                        template allocate_rr<typename details:: 
  |                                                           vov_node<Type,details::add_op<Type> > >(v0,v)); 
  |  
  |                            case details::e_mul : return expr_gen(details::e_neg, 
  |                                                     expr_gen.node_allocator_-> 
  |                                                        template allocate_rr<typename details:: 
  |                                                           vov_node<Type,details::mul_op<Type> > >(v0,v)); 
  |  
  |                            case details::e_div : return expr_gen(details::e_neg, 
  |                                                     expr_gen.node_allocator_-> 
  |                                                        template allocate_rr<typename details:: 
  |                                                           vov_node<Type,details::div_op<Type> > >(v0,v)); 
  |                            default : break; 
  |                         } 
  |                      } 
  |                   } 
  |                } 
  |  
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                      \ 
  |                   case op0 : return expr_gen.node_allocator_->                                     \ 
  |                                 template allocate_cr<typename details::bov_node<Type,op1<Type> > > \ 
  |                                    (branch[0], v);                                                 \ 
  |  
  |                   basic_opr_switch_statements 
  |                   extended_opr_switch_statements 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |          }; 
  |  
  |          struct synthesize_cob_expression 
  |          { 
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                const Type c = static_cast<details::literal_node<Type>*>(branch[0])->value(); 
  |  
  |                details::free_node(*expr_gen.node_allocator_,branch[0]); 
  |  
  |                if (std::equal_to<T>()(T(0),c) && (details::e_mul == operation)) 
  |                { 
  |                   details::free_node(*expr_gen.node_allocator_,branch[1]); 
  |  
  |                   return expr_gen(T(0)); 
  |                } 
  |                else if (std::equal_to<T>()(T(0),c) && (details::e_div == operation)) 
  |                { 
  |                   details::free_node(*expr_gen.node_allocator_, branch[1]); 
  |  
  |                   return expr_gen(T(0)); 
  |                } 
  |                else if (std::equal_to<T>()(T(0),c) && (details::e_add == operation)) 
  |                   return branch[1]; 
  |                else if (std::equal_to<T>()(T(1),c) && (details::e_mul == operation)) 
  |                   return branch[1]; 
  |  
  |                if (details::is_cob_node(branch[1])) 
  |                { 
  |                   // Simplify expressions of the form: 
  |                   // 1. (1 * (2 * (3 * (4 * (5 * (6 * (7 * (8 * (9 + x))))))))) --> 40320 * (9 + x) 
  |                   // 2. (1 + (2 + (3 + (4 + (5 + (6 + (7 + (8 + (9 + x))))))))) --> 45 + x 
  |                   if ( 
  |                        (details::e_mul == operation) || 
  |                        (details::e_add == operation) 
  |                      ) 
  |                   { 
  |                      details::cob_base_node<Type>* cobnode = static_cast<details::cob_base_node<Type>*>(branch[1]); 
  |  
  |                      if (operation == cobnode->operation()) 
  |                      { 
  |                         switch (operation) 
  |                         { 
  |                            case details::e_add : cobnode->set_c(c + cobnode->c()); break; 
  |                            case details::e_mul : cobnode->set_c(c * cobnode->c()); break; 
  |                            default             : return error_node(); 
  |                         } 
  |  
  |                         return cobnode; 
  |                      } 
  |                   } 
  |  
  |                   if (operation == details::e_mul) 
  |                   { 
  |                      details::cob_base_node<Type>* cobnode = static_cast<details::cob_base_node<Type>*>(branch[1]); 
  |                      details::operator_type cob_opr = cobnode->operation(); 
  |  
  |                      if ( 
  |                           (details::e_div == cob_opr) || 
  |                           (details::e_mul == cob_opr) 
  |                         ) 
  |                      { 
  |                         switch (cob_opr) 
  |                         { 
  |                            case details::e_div : cobnode->set_c(c * cobnode->c()); break; 
  |                            case details::e_mul : cobnode->set_c(cobnode->c() / c); break; 
  |                            default             : return error_node(); 
  |                         } 
  |  
  |                         return cobnode; 
  |                      } 
  |                   } 
  |                   else if (operation == details::e_div) 
  |                   { 
  |                      details::cob_base_node<Type>* cobnode = static_cast<details::cob_base_node<Type>*>(branch[1]); 
  |                      details::operator_type cob_opr = cobnode->operation(); 
  |  
  |                      if ( 
  |                           (details::e_div == cob_opr) || 
  |                           (details::e_mul == cob_opr) 
  |                         ) 
  |                      { 
  |                         details::expression_node<Type>* new_cobnode = error_node(); 
  |  
  |                         switch (cob_opr) 
  |                         { 
  |                            case details::e_div : new_cobnode = expr_gen.node_allocator_-> 
  |                                                     template allocate_tt<typename details::cob_node<Type,details::mul_op<Type> > > 
  |                                                        (c / cobnode->c(), cobnode->move_branch(0)); 
  |                                                  break; 
  |  
  |                            case details::e_mul : new_cobnode = expr_gen.node_allocator_-> 
  |                                                     template allocate_tt<typename details::cob_node<Type,details::div_op<Type> > > 
  |                                                        (c / cobnode->c(), cobnode->move_branch(0)); 
  |                                                  break; 
  |  
  |                            default             : return error_node(); 
  |                         } 
  |  
  |                         details::free_node(*expr_gen.node_allocator_,branch[1]); 
  |  
  |                         return new_cobnode; 
  |                      } 
  |                   } 
  |                } 
  |                #ifndef exprtk_disable_enhanced_features 
  |                else if (details::is_sf3ext_node(branch[1])) 
  |                { 
  |                   expression_node_ptr result = error_node(); 
  |  
  |                   const bool synthesis_result = 
  |                      synthesize_sf4ext_expression::template compile_right<ctype> 
  |                         (expr_gen, c, operation, branch[1], result); 
  |  
  |                   if (synthesis_result) 
  |                   { 
  |                      details::free_node(*expr_gen.node_allocator_,branch[1]); 
  |  
  |                      return result; 
  |                   } 
  |                } 
  |                #endif 
  |  
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                      \ 
  |                   case op0 : return expr_gen.node_allocator_->                                     \ 
  |                                 template allocate_tt<typename details::cob_node<Type,op1<Type> > > \ 
  |                                    (c,  branch[1]);                                                \ 
  |  
  |                   basic_opr_switch_statements 
  |                   extended_opr_switch_statements 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |          }; 
  |  
  |          struct synthesize_boc_expression 
  |          { 
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                const Type c = static_cast<details::literal_node<Type>*>(branch[1])->value(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_), branch[1]); 
  |  
  |                if (std::equal_to<T>()(T(0),c) && (details::e_mul == operation)) 
  |                { 
  |                   details::free_node(*expr_gen.node_allocator_, branch[0]); 
  |  
  |                   return expr_gen(T(0)); 
  |                } 
  |                else if (std::equal_to<T>()(T(0),c) && (details::e_div == operation)) 
  |                { 
  |                   details::free_node(*expr_gen.node_allocator_, branch[0]); 
  |  
  |                   return expr_gen(std::numeric_limits<T>::quiet_NaN()); 
  |                } 
  |                else if (std::equal_to<T>()(T(0),c) && (details::e_add == operation)) 
  |                   return branch[0]; 
  |                else if (std::equal_to<T>()(T(1),c) && (details::e_mul == operation)) 
  |                   return branch[0]; 
  |  
  |                if (details::is_boc_node(branch[0])) 
  |                { 
  |                   // Simplify expressions of the form: 
  |                   // 1. (((((((((x + 9) * 8) * 7) * 6) * 5) * 4) * 3) * 2) * 1) --> (x + 9) * 40320 
  |                   // 2. (((((((((x + 9) + 8) + 7) + 6) + 5) + 4) + 3) + 2) + 1) --> x + 45 
  |                   if ( 
  |                        (details::e_mul == operation) || 
  |                        (details::e_add == operation) 
  |                      ) 
  |                   { 
  |                      details::boc_base_node<Type>* bocnode = static_cast<details::boc_base_node<Type>*>(branch[0]); 
  |  
  |                      if (operation == bocnode->operation()) 
  |                      { 
  |                         switch (operation) 
  |                         { 
  |                            case details::e_add : bocnode->set_c(c + bocnode->c()); break; 
  |                            case details::e_mul : bocnode->set_c(c * bocnode->c()); break; 
  |                            default             : return error_node(); 
  |                         } 
  |  
  |                         return bocnode; 
  |                      } 
  |                   } 
  |                   else if (operation == details::e_div) 
  |                   { 
  |                      details::boc_base_node<Type>* bocnode = static_cast<details::boc_base_node<Type>*>(branch[0]); 
  |                      details::operator_type        boc_opr = bocnode->operation(); 
  |  
  |                      if ( 
  |                           (details::e_div == boc_opr) || 
  |                           (details::e_mul == boc_opr) 
  |                         ) 
  |                      { 
  |                         switch (boc_opr) 
  |                         { 
  |                            case details::e_div : bocnode->set_c(c * bocnode->c()); break; 
  |                            case details::e_mul : bocnode->set_c(bocnode->c() / c); break; 
  |                            default             : return error_node(); 
  |                         } 
  |  
  |                         return bocnode; 
  |                      } 
  |                   } 
  |                   else if (operation == details::e_pow) 
  |                   { 
  |                      // (v ^ c0) ^ c1 --> v ^(c0 * c1) 
  |                      details::boc_base_node<Type>* bocnode = static_cast<details::boc_base_node<Type>*>(branch[0]); 
  |                      details::operator_type        boc_opr = bocnode->operation(); 
  |  
  |                      if (details::e_pow == boc_opr) 
  |                      { 
  |                         bocnode->set_c(bocnode->c() * c); 
  |  
  |                         return bocnode; 
  |                      } 
  |                   } 
  |                } 
  |  
  |                #ifndef exprtk_disable_enhanced_features 
  |                if (details::is_sf3ext_node(branch[0])) 
  |                { 
  |                   expression_node_ptr result = error_node(); 
  |  
  |                   const bool synthesis_result = 
  |                      synthesize_sf4ext_expression::template compile_left<ctype> 
  |                         (expr_gen, c, operation, branch[0], result); 
  |  
  |                   if (synthesis_result) 
  |                   { 
  |                      free_node(*expr_gen.node_allocator_, branch[0]); 
  |  
  |                      return result; 
  |                   } 
  |                } 
  |                #endif 
  |  
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                      \ 
  |                   case op0 : return expr_gen.node_allocator_->                                     \ 
  |                                 template allocate_cr<typename details::boc_node<Type,op1<Type> > > \ 
  |                                    (branch[0], c);                                                 \ 
  |  
  |                   basic_opr_switch_statements 
  |                   extended_opr_switch_statements 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |          }; 
  |  
  |          struct synthesize_cocob_expression 
  |          { 
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                expression_node_ptr result = error_node(); 
  |  
  |                // (cob) o c --> cob 
  |                if (details::is_cob_node(branch[0])) 
  |                { 
  |                   details::cob_base_node<Type>* cobnode = static_cast<details::cob_base_node<Type>*>(branch[0]); 
  |  
  |                   const Type c = static_cast<details::literal_node<Type>*>(branch[1])->value(); 
  |  
  |                   if (std::equal_to<T>()(T(0),c) && (details::e_mul == operation)) 
  |                   { 
  |                      details::free_node(*expr_gen.node_allocator_, branch[0]); 
  |                      details::free_node(*expr_gen.node_allocator_, branch[1]); 
  |  
  |                      return expr_gen(T(0)); 
  |                   } 
  |                   else if (std::equal_to<T>()(T(0),c) && (details::e_div == operation)) 
  |                   { 
  |                      details::free_node(*expr_gen.node_allocator_, branch[0]); 
  |                      details::free_node(*expr_gen.node_allocator_, branch[1]); 
  |  
  |                      return expr_gen(T(std::numeric_limits<T>::quiet_NaN())); 
  |                   } 
  |                   else if (std::equal_to<T>()(T(0),c) && (details::e_add == operation)) 
  |                   { 
  |                      details::free_node(*expr_gen.node_allocator_, branch[1]); 
  |  
  |                      return branch[0]; 
  |                   } 
  |                   else if (std::equal_to<T>()(T(1),c) && (details::e_mul == operation)) 
  |                   { 
  |                      details::free_node(*expr_gen.node_allocator_, branch[1]); 
  |  
  |                      return branch[0]; 
  |                   } 
  |                   else if (std::equal_to<T>()(T(1),c) && (details::e_div == operation)) 
  |                   { 
  |                      details::free_node(*expr_gen.node_allocator_, branch[1]); 
  |  
  |                      return branch[0]; 
  |                   } 
  |  
  |                   const bool op_addsub = (details::e_add == cobnode->operation()) || 
  |                                          (details::e_sub == cobnode->operation()) ; 
  |  
  |                   if (op_addsub) 
  |                   { 
  |                      switch (operation) 
  |                      { 
  |                         case details::e_add : cobnode->set_c(cobnode->c() + c); break; 
  |                         case details::e_sub : cobnode->set_c(cobnode->c() - c); break; 
  |                         default             : return error_node(); 
  |                      } 
  |  
  |                      result = cobnode; 
  |                   } 
  |                   else if (details::e_mul == cobnode->operation()) 
  |                   { 
  |                      switch (operation) 
  |                      { 
  |                         case details::e_mul : cobnode->set_c(cobnode->c() * c); break; 
  |                         case details::e_div : cobnode->set_c(cobnode->c() / c); break; 
  |                         default             : return error_node(); 
  |                      } 
  |  
  |                      result = cobnode; 
  |                   } 
  |                   else if (details::e_div == cobnode->operation()) 
  |                   { 
  |                      if (details::e_mul == operation) 
  |                      { 
  |                         cobnode->set_c(cobnode->c() * c); 
  |                         result = cobnode; 
  |                      } 
  |                      else if (details::e_div == operation) 
  |                      { 
  |                         result = expr_gen.node_allocator_-> 
  |                                     template allocate_tt<typename details::cob_node<Type,details::div_op<Type> > > 
  |                                        (cobnode->c() / c, cobnode->move_branch(0)); 
  |  
  |                         details::free_node(*expr_gen.node_allocator_, branch[0]); 
  |                      } 
  |                   } 
  |  
  |                   if (result) 
  |                   { 
  |                      details::free_node(*expr_gen.node_allocator_,branch[1]); 
  |                   } 
  |                } 
  |  
  |                // c o (cob) --> cob 
  |                else if (details::is_cob_node(branch[1])) 
  |                { 
  |                   details::cob_base_node<Type>* cobnode = static_cast<details::cob_base_node<Type>*>(branch[1]); 
  |  
  |                   const Type c = static_cast<details::literal_node<Type>*>(branch[0])->value(); 
  |  
  |                   if (std::equal_to<T>()(T(0),c) && (details::e_mul == operation)) 
  |                   { 
  |                      details::free_node(*expr_gen.node_allocator_, branch[0]); 
  |                      details::free_node(*expr_gen.node_allocator_, branch[1]); 
  |  
  |                      return expr_gen(T(0)); 
  |                   } 
  |                   else if (std::equal_to<T>()(T(0),c) && (details::e_div == operation)) 
  |                   { 
  |                      details::free_node(*expr_gen.node_allocator_, branch[0]); 
  |                      details::free_node(*expr_gen.node_allocator_, branch[1]); 
  |  
  |                      return expr_gen(T(0)); 
  |                   } 
  |                   else if (std::equal_to<T>()(T(0),c) && (details::e_add == operation)) 
  |                   { 
  |                      details::free_node(*expr_gen.node_allocator_, branch[0]); 
  |  
  |                      return branch[1]; 
  |                   } 
  |                   else if (std::equal_to<T>()(T(1),c) && (details::e_mul == operation)) 
  |                   { 
  |                      details::free_node(*expr_gen.node_allocator_, branch[0]); 
  |  
  |                      return branch[1]; 
  |                   } 
  |  
  |                   if (details::e_add == cobnode->operation()) 
  |                   { 
  |                      if (details::e_add == operation) 
  |                      { 
  |                         cobnode->set_c(c + cobnode->c()); 
  |                         result = cobnode; 
  |                      } 
  |                      else if (details::e_sub == operation) 
  |                      { 
  |                         result = expr_gen.node_allocator_-> 
  |                                     template allocate_tt<typename details::cob_node<Type,details::sub_op<Type> > > 
  |                                        (c - cobnode->c(), cobnode->move_branch(0)); 
  |  
  |                         details::free_node(*expr_gen.node_allocator_,branch[1]); 
  |                      } 
  |                   } 
  |                   else if (details::e_sub == cobnode->operation()) 
  |                   { 
  |                      if (details::e_add == operation) 
  |                      { 
  |                         cobnode->set_c(c + cobnode->c()); 
  |                         result = cobnode; 
  |                      } 
  |                      else if (details::e_sub == operation) 
  |                      { 
  |                         result = expr_gen.node_allocator_-> 
  |                                     template allocate_tt<typename details::cob_node<Type,details::add_op<Type> > > 
  |                                        (c - cobnode->c(), cobnode->move_branch(0)); 
  |  
  |                         details::free_node(*expr_gen.node_allocator_,branch[1]); 
  |                      } 
  |                   } 
  |                   else if (details::e_mul == cobnode->operation()) 
  |                   { 
  |                      if (details::e_mul == operation) 
  |                      { 
  |                         cobnode->set_c(c * cobnode->c()); 
  |                         result = cobnode; 
  |                      } 
  |                      else if (details::e_div == operation) 
  |                      { 
  |                         result = expr_gen.node_allocator_-> 
  |                                     template allocate_tt<typename details::cob_node<Type,details::div_op<Type> > > 
  |                                        (c / cobnode->c(), cobnode->move_branch(0)); 
  |  
  |                         details::free_node(*expr_gen.node_allocator_,branch[1]); 
  |                      } 
  |                   } 
  |                   else if (details::e_div == cobnode->operation()) 
  |                   { 
  |                      if (details::e_mul == operation) 
  |                      { 
  |                         cobnode->set_c(c * cobnode->c()); 
  |                         result = cobnode; 
  |                      } 
  |                      else if (details::e_div == operation) 
  |                      { 
  |                         result = expr_gen.node_allocator_-> 
  |                                     template allocate_tt<typename details::cob_node<Type,details::mul_op<Type> > > 
  |                                        (c / cobnode->c(), cobnode->move_branch(0)); 
  |  
  |                         details::free_node(*expr_gen.node_allocator_,branch[1]); 
  |                      } 
  |                   } 
  |  
  |                   if (result) 
  |                   { 
  |                      details::free_node(*expr_gen.node_allocator_,branch[0]); 
  |                   } 
  |                } 
  |  
  |                return result; 
  |             } 
  |          }; 
  |  
  |          struct synthesize_coboc_expression 
  |          { 
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                expression_node_ptr result = error_node(); 
  |  
  |                // (boc) o c --> boc 
  |                if (details::is_boc_node(branch[0])) 
  |                { 
  |                   details::boc_base_node<Type>* bocnode = static_cast<details::boc_base_node<Type>*>(branch[0]); 
  |  
  |                   const Type c = static_cast<details::literal_node<Type>*>(branch[1])->value(); 
  |  
  |                   if (details::e_add == bocnode->operation()) 
  |                   { 
  |                      switch (operation) 
  |                      { 
  |                         case details::e_add : bocnode->set_c(bocnode->c() + c); break; 
  |                         case details::e_sub : bocnode->set_c(bocnode->c() - c); break; 
  |                         default             : return error_node(); 
  |                      } 
  |  
  |                      result = bocnode; 
  |                   } 
  |                   else if (details::e_mul == bocnode->operation()) 
  |                   { 
  |                      switch (operation) 
  |                      { 
  |                         case details::e_mul : bocnode->set_c(bocnode->c() * c); break; 
  |                         case details::e_div : bocnode->set_c(bocnode->c() / c); break; 
  |                         default             : return error_node(); 
  |                      } 
  |  
  |                      result = bocnode; 
  |                   } 
  |                   else if (details::e_sub == bocnode->operation()) 
  |                   { 
  |                      if (details::e_add == operation) 
  |                      { 
  |                         result = expr_gen.node_allocator_-> 
  |                                     template allocate_tt<typename details::boc_node<Type,details::add_op<Type> > > 
  |                                        (bocnode->move_branch(0), c - bocnode->c()); 
  |  
  |                         details::free_node(*expr_gen.node_allocator_,branch[0]); 
  |                      } 
  |                      else if (details::e_sub == operation) 
  |                      { 
  |                         bocnode->set_c(bocnode->c() + c); 
  |                         result = bocnode; 
  |                      } 
  |                   } 
  |                   else if (details::e_div == bocnode->operation()) 
  |                   { 
  |                      switch (operation) 
  |                      { 
  |                         case details::e_div : bocnode->set_c(bocnode->c() * c); break; 
  |                         case details::e_mul : bocnode->set_c(bocnode->c() / c); break; 
  |                         default             : return error_node(); 
  |                      } 
  |  
  |                      result = bocnode; 
  |                   } 
  |  
  |                   if (result) 
  |                   { 
  |                      details::free_node(*expr_gen.node_allocator_, branch[1]); 
  |                   } 
  |                } 
  |  
  |                // c o (boc) --> boc 
  |                else if (details::is_boc_node(branch[1])) 
  |                { 
  |                   details::boc_base_node<Type>* bocnode = static_cast<details::boc_base_node<Type>*>(branch[1]); 
  |  
  |                   const Type c = static_cast<details::literal_node<Type>*>(branch[0])->value(); 
  |  
  |                   if (details::e_add == bocnode->operation()) 
  |                   { 
  |                      if (details::e_add == operation) 
  |                      { 
  |                         bocnode->set_c(c + bocnode->c()); 
  |                         result = bocnode; 
  |                      } 
  |                      else if (details::e_sub == operation) 
  |                      { 
  |                         result = expr_gen.node_allocator_-> 
  |                                     template allocate_tt<typename details::cob_node<Type,details::sub_op<Type> > > 
  |                                        (c - bocnode->c(), bocnode->move_branch(0)); 
  |  
  |                         details::free_node(*expr_gen.node_allocator_,branch[1]); 
  |                      } 
  |                   } 
  |                   else if (details::e_sub == bocnode->operation()) 
  |                   { 
  |                      if (details::e_add == operation) 
  |                      { 
  |                         result = expr_gen.node_allocator_-> 
  |                                     template allocate_tt<typename details::boc_node<Type,details::add_op<Type> > > 
  |                                        (bocnode->move_branch(0), c - bocnode->c()); 
  |  
  |                         details::free_node(*expr_gen.node_allocator_,branch[1]); 
  |                      } 
  |                      else if (details::e_sub == operation) 
  |                      { 
  |                         result = expr_gen.node_allocator_-> 
  |                                     template allocate_tt<typename details::cob_node<Type,details::sub_op<Type> > > 
  |                                        (c + bocnode->c(), bocnode->move_branch(0)); 
  |  
  |                         details::free_node(*expr_gen.node_allocator_,branch[1]); 
  |                      } 
  |                   } 
  |                   else if (details::e_mul == bocnode->operation()) 
  |                   { 
  |                      if (details::e_mul == operation) 
  |                      { 
  |                         bocnode->set_c(c * bocnode->c()); 
  |                         result = bocnode; 
  |                      } 
  |                      else if (details::e_div == operation) 
  |                      { 
  |                         result = expr_gen.node_allocator_-> 
  |                                     template allocate_tt<typename details::cob_node<Type,details::div_op<Type> > > 
  |                                        (c / bocnode->c(), bocnode->move_branch(0)); 
  |  
  |                         details::free_node(*expr_gen.node_allocator_,branch[1]); 
  |                      } 
  |                   } 
  |                   else if (details::e_div == bocnode->operation()) 
  |                   { 
  |                      if (details::e_mul == operation) 
  |                      { 
  |                         bocnode->set_c(bocnode->c() / c); 
  |                         result = bocnode; 
  |                      } 
  |                      else if (details::e_div == operation) 
  |                      { 
  |                         result = expr_gen.node_allocator_-> 
  |                                     template allocate_tt<typename details::cob_node<Type,details::div_op<Type> > > 
  |                                        (c * bocnode->c(), bocnode->move_branch(0)); 
  |  
  |                         details::free_node(*expr_gen.node_allocator_,branch[1]); 
  |                      } 
  |                   } 
  |  
  |                   if (result) 
  |                   { 
  |                      details::free_node(*expr_gen.node_allocator_,branch[0]); 
  |                   } 
  |                } 
  |  
  |                return result; 
  |             } 
  |          }; 
  |  
  |          #ifndef exprtk_disable_enhanced_features 
  |          inline bool synthesize_expression(const details::operator_type& operation, 
  |                                            expression_node_ptr (&branch)[2], 
  |                                            expression_node_ptr& result) 
  |          { 
  |             result = error_node(); 
  |  
  |             if (!operation_optimisable(operation)) 
  |                return false; 
  |  
  |             const std::string node_id = branch_to_id(branch); 
  |  
  |             const typename synthesize_map_t::iterator itr = synthesize_map_.find(node_id); 
  |  
  |             if (synthesize_map_.end() != itr) 
  |             { 
  |                result = itr->second((*this), operation, branch); 
  |  
  |                return true; 
  |             } 
  |             else 
  |                return false; 
  |          } 
  |  
  |          struct synthesize_vov_expression 
  |          { 
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                const Type& v1 = static_cast<details::variable_node<Type>*>(branch[0])->ref(); 
  |                const Type& v2 = static_cast<details::variable_node<Type>*>(branch[1])->ref(); 
  |  
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                      \ 
  |                   case op0 : return expr_gen.node_allocator_->                                     \ 
  |                                 template allocate_rr<typename details::vov_node<Type,op1<Type> > > \ 
  |                                    (v1, v2);                                                       \ 
  |  
  |                   basic_opr_switch_statements 
  |                   extended_opr_switch_statements 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |          }; 
  |  
  |          struct synthesize_cov_expression 
  |          { 
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                const Type  c = static_cast<details::literal_node<Type>*> (branch[0])->value(); 
  |                const Type& v = static_cast<details::variable_node<Type>*>(branch[1])->ref  (); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |  
  |                if (std::equal_to<T>()(T(0),c) && (details::e_mul == operation)) 
  |                   return expr_gen(T(0)); 
  |                else if (std::equal_to<T>()(T(0),c) && (details::e_div == operation)) 
  |                   return expr_gen(T(0)); 
  |                else if (std::equal_to<T>()(T(0),c) && (details::e_add == operation)) 
  |                   return static_cast<details::variable_node<Type>*>(branch[1]); 
  |                else if (std::equal_to<T>()(T(1),c) && (details::e_mul == operation)) 
  |                   return static_cast<details::variable_node<Type>*>(branch[1]); 
  |  
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                      \ 
  |                   case op0 : return expr_gen.node_allocator_->                                     \ 
  |                                 template allocate_cr<typename details::cov_node<Type,op1<Type> > > \ 
  |                                    (c, v);                                                         \ 
  |  
  |                   basic_opr_switch_statements 
  |                   extended_opr_switch_statements 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |          }; 
  |  
  |          struct synthesize_voc_expression 
  |          { 
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                const Type& v = static_cast<details::variable_node<Type>*>(branch[0])->ref  (); 
  |                const Type  c = static_cast<details::literal_node<Type>*> (branch[1])->value(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_), branch[1]); 
  |  
  |                if (expr_gen.cardinal_pow_optimisable(operation,c)) 
  |                { 
  |                   if (std::equal_to<T>()(T(1),c)) 
  |                      return branch[0]; 
  |                   else 
  |                      return expr_gen.cardinal_pow_optimisation(v,c); 
  |                } 
  |                else if (std::equal_to<T>()(T(0),c) && (details::e_mul == operation)) 
  |                   return expr_gen(T(0)); 
  |                else if (std::equal_to<T>()(T(0),c) && (details::e_div == operation)) 
  |                   return expr_gen(std::numeric_limits<T>::quiet_NaN()); 
  |                else if (std::equal_to<T>()(T(0),c) && (details::e_add == operation)) 
  |                   return static_cast<details::variable_node<Type>*>(branch[0]); 
  |                else if (std::equal_to<T>()(T(1),c) && (details::e_mul == operation)) 
  |                   return static_cast<details::variable_node<Type>*>(branch[0]); 
  |                else if (std::equal_to<T>()(T(1),c) && (details::e_div == operation)) 
  |                   return static_cast<details::variable_node<Type>*>(branch[0]); 
  |  
  |                switch (operation) 
  |                { 
  |                   #define case_stmt(op0, op1)                                                      \ 
  |                   case op0 : return expr_gen.node_allocator_->                                     \ 
  |                                 template allocate_rc<typename details::voc_node<Type,op1<Type> > > \ 
  |                                    (v, c);                                                         \ 
  |  
  |                   basic_opr_switch_statements 
  |                   extended_opr_switch_statements 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |          }; 
  |  
  |          struct synthesize_sf3ext_expression 
  |          { 
  |             template <typename T0, typename T1, typename T2> 
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& sf3opr, 
  |                                                       T0 t0, T1 t1, T2 t2) 
  |             { 
  |                switch (sf3opr) 
  |                { 
  |                   #define case_stmt(op)                                                                              \ 
  |                   case details::e_sf##op : return details::T0oT1oT2_sf3ext<T,T0,T1,T2,details::sf##op##_op<Type> >:: \ 
  |                                 allocate(*(expr_gen.node_allocator_), t0, t1, t2);                                   \ 
  |  
  |                   case_stmt(00) case_stmt(01) case_stmt(02) case_stmt(03) 
  |                   case_stmt(04) case_stmt(05) case_stmt(06) case_stmt(07) 
  |                   case_stmt(08) case_stmt(09) case_stmt(10) case_stmt(11) 
  |                   case_stmt(12) case_stmt(13) case_stmt(14) case_stmt(15) 
  |                   case_stmt(16) case_stmt(17) case_stmt(18) case_stmt(19) 
  |                   case_stmt(20) case_stmt(21) case_stmt(22) case_stmt(23) 
  |                   case_stmt(24) case_stmt(25) case_stmt(26) case_stmt(27) 
  |                   case_stmt(28) case_stmt(29) case_stmt(30) 
  |                   #undef case_stmt 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |  
  |             template <typename T0, typename T1, typename T2> 
  |             static inline bool compile(expression_generator<Type>& expr_gen, const std::string& id, 
  |                                        T0 t0, T1 t1, T2 t2, 
  |                                        expression_node_ptr& result) 
  |             { 
  |                details::operator_type sf3opr; 
  |  
  |                if (!expr_gen.sf3_optimisable(id,sf3opr)) 
  |                   return false; 
  |                else 
  |                   result = synthesize_sf3ext_expression::template process<T0, T1, T2> 
  |                               (expr_gen, sf3opr, t0, t1, t2); 
  |  
  |                return true; 
  |             } 
  |          }; 
  |  
  |          struct synthesize_sf4ext_expression 
  |          { 
  |             template <typename T0, typename T1, typename T2, typename T3> 
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& sf4opr, 
  |                                                       T0 t0, T1 t1, T2 t2, T3 t3) 
  |             { 
  |                switch (sf4opr) 
  |                { 
  |                   #define case_stmt0(op)                                                                                      \ 
  |                   case details::e_sf##op : return details::T0oT1oT2oT3_sf4ext<Type,T0,T1,T2,T3,details::sf##op##_op<Type> >:: \ 
  |                                 allocate(*(expr_gen.node_allocator_), t0, t1, t2, t3);                                        \ 
  |  
  |                   #define case_stmt1(op)                                                                                             \ 
  |                   case details::e_sf4ext##op : return details::T0oT1oT2oT3_sf4ext<Type,T0,T1,T2,T3,details::sfext##op##_op<Type> >:: \ 
  |                                 allocate(*(expr_gen.node_allocator_), t0, t1, t2, t3);                                               \ 
  |  
  |                   case_stmt0(48) case_stmt0(49) case_stmt0(50) case_stmt0(51) 
  |                   case_stmt0(52) case_stmt0(53) case_stmt0(54) case_stmt0(55) 
  |                   case_stmt0(56) case_stmt0(57) case_stmt0(58) case_stmt0(59) 
  |                   case_stmt0(60) case_stmt0(61) case_stmt0(62) case_stmt0(63) 
  |                   case_stmt0(64) case_stmt0(65) case_stmt0(66) case_stmt0(67) 
  |                   case_stmt0(68) case_stmt0(69) case_stmt0(70) case_stmt0(71) 
  |                   case_stmt0(72) case_stmt0(73) case_stmt0(74) case_stmt0(75) 
  |                   case_stmt0(76) case_stmt0(77) case_stmt0(78) case_stmt0(79) 
  |                   case_stmt0(80) case_stmt0(81) case_stmt0(82) case_stmt0(83) 
  |  
  |                   case_stmt1(00) case_stmt1(01) case_stmt1(02) case_stmt1(03) 
  |                   case_stmt1(04) case_stmt1(05) case_stmt1(06) case_stmt1(07) 
  |                   case_stmt1(08) case_stmt1(09) case_stmt1(10) case_stmt1(11) 
  |                   case_stmt1(12) case_stmt1(13) case_stmt1(14) case_stmt1(15) 
  |                   case_stmt1(16) case_stmt1(17) case_stmt1(18) case_stmt1(19) 
  |                   case_stmt1(20) case_stmt1(21) case_stmt1(22) case_stmt1(23) 
  |                   case_stmt1(24) case_stmt1(25) case_stmt1(26) case_stmt1(27) 
  |                   case_stmt1(28) case_stmt1(29) case_stmt1(30) case_stmt1(31) 
  |                   case_stmt1(32) case_stmt1(33) case_stmt1(34) case_stmt1(35) 
  |                   case_stmt1(36) case_stmt1(37) case_stmt1(38) case_stmt1(39) 
  |                   case_stmt1(40) case_stmt1(41) case_stmt1(42) case_stmt1(43) 
  |                   case_stmt1(44) case_stmt1(45) case_stmt1(46) case_stmt1(47) 
  |                   case_stmt1(48) case_stmt1(49) case_stmt1(50) case_stmt1(51) 
  |                   case_stmt1(52) case_stmt1(53) case_stmt1(54) case_stmt1(55) 
  |                   case_stmt1(56) case_stmt1(57) case_stmt1(58) case_stmt1(59) 
  |                   case_stmt1(60) case_stmt1(61) 
  |  
  |                   #undef case_stmt0 
  |                   #undef case_stmt1 
  |                   default : return error_node(); 
  |                } 
  |             } 
  |  
  |             template <typename T0, typename T1, typename T2, typename T3> 
  |             static inline bool compile(expression_generator<Type>& expr_gen, const std::string& id, 
  |                                        T0 t0, T1 t1, T2 t2, T3 t3, 
  |                                        expression_node_ptr& result) 
  |             { 
  |                details::operator_type sf4opr; 
  |  
  |                if (!expr_gen.sf4_optimisable(id,sf4opr)) 
  |                   return false; 
  |                else 
  |                   result = synthesize_sf4ext_expression::template process<T0, T1, T2, T3> 
  |                               (expr_gen, sf4opr, t0, t1, t2, t3); 
  |  
  |                return true; 
  |             } 
  |  
  |             // T o (sf3ext) 
  |             template <typename ExternalType> 
  |             static inline bool compile_right(expression_generator<Type>& expr_gen, 
  |                                              ExternalType t, 
  |                                              const details::operator_type& operation, 
  |                                              expression_node_ptr& sf3node, 
  |                                              expression_node_ptr& result) 
  |             { 
  |                if (!details::is_sf3ext_node(sf3node)) 
  |                   return false; 
  |  
  |                typedef details::T0oT1oT2_base_node<Type>* sf3ext_base_ptr; 
  |  
  |                sf3ext_base_ptr n = static_cast<sf3ext_base_ptr>(sf3node); 
  |                const std::string id = "t" + expr_gen.to_str(operation) + "(" + n->type_id() + ")" 
  |  
  |                switch (n->type()) 
  |                { 
  |                   case details::expression_node<Type>::e_covoc : return compile_right_impl 
  |                                                                     <typename covoc_t::sf3_type_node,ExternalType, ctype, vtype, ctype> 
  |                                                                        (expr_gen, id, t, sf3node, result); 
  |  
  |                   case details::expression_node<Type>::e_covov : return compile_right_impl 
  |                                                                     <typename covov_t::sf3_type_node,ExternalType, ctype, vtype, vtype> 
  |                                                                        (expr_gen, id, t, sf3node, result); 
  |  
  |                   case details::expression_node<Type>::e_vocov : return compile_right_impl 
  |                                                                     <typename vocov_t::sf3_type_node,ExternalType, vtype, ctype, vtype> 
  |                                                                        (expr_gen, id, t, sf3node, result); 
  |  
  |                   case details::expression_node<Type>::e_vovoc : return compile_right_impl 
  |                                                                     <typename vovoc_t::sf3_type_node,ExternalType, vtype, vtype, ctype> 
  |                                                                        (expr_gen, id, t, sf3node, result); 
  |  
  |                   case details::expression_node<Type>::e_vovov : return compile_right_impl 
  |                                                                     <typename vovov_t::sf3_type_node,ExternalType, vtype, vtype, vtype> 
  |                                                                        (expr_gen, id, t, sf3node, result); 
  |  
  |                   default                                      : return false; 
  |                } 
  |             } 
  |  
  |             // (sf3ext) o T 
  |             template <typename ExternalType> 
  |             static inline bool compile_left(expression_generator<Type>& expr_gen, 
  |                                             ExternalType t, 
  |                                             const details::operator_type& operation, 
  |                                             expression_node_ptr& sf3node, 
  |                                             expression_node_ptr& result) 
  |             { 
  |                if (!details::is_sf3ext_node(sf3node)) 
  |                   return false; 
  |  
  |                typedef details::T0oT1oT2_base_node<Type>* sf3ext_base_ptr; 
  |  
  |                sf3ext_base_ptr n = static_cast<sf3ext_base_ptr>(sf3node); 
  |  
  |                const std::string id = "(" + n->type_id() + ")" + expr_gen.to_str(operation) + "t" 
  |  
  |                switch (n->type()) 
  |                { 
  |                   case details::expression_node<Type>::e_covoc : return compile_left_impl 
  |                                                                     <typename covoc_t::sf3_type_node,ExternalType, ctype, vtype, ctype> 
  |                                                                        (expr_gen, id, t, sf3node, result); 
  |  
  |                   case details::expression_node<Type>::e_covov : return compile_left_impl 
  |                                                                     <typename covov_t::sf3_type_node,ExternalType, ctype, vtype, vtype> 
  |                                                                        (expr_gen, id, t, sf3node, result); 
  |  
  |                   case details::expression_node<Type>::e_vocov : return compile_left_impl 
  |                                                                     <typename vocov_t::sf3_type_node,ExternalType, vtype, ctype, vtype> 
  |                                                                        (expr_gen, id, t, sf3node, result); 
  |  
  |                   case details::expression_node<Type>::e_vovoc : return compile_left_impl 
  |                                                                     <typename vovoc_t::sf3_type_node,ExternalType, vtype, vtype, ctype> 
  |                                                                        (expr_gen, id, t, sf3node, result); 
  |  
  |                   case details::expression_node<Type>::e_vovov : return compile_left_impl 
  |                                                                     <typename vovov_t::sf3_type_node,ExternalType, vtype, vtype, vtype> 
  |                                                                        (expr_gen, id, t, sf3node, result); 
  |  
  |                   default                                      : return false; 
  |                } 
  |             } 
  |  
  |             template <typename SF3TypeNode, typename ExternalType, typename T0, typename T1, typename T2> 
  |             static inline bool compile_right_impl(expression_generator<Type>& expr_gen, 
  |                                                   const std::string& id, 
  |                                                   ExternalType t, 
  |                                                   expression_node_ptr& node, 
  |                                                   expression_node_ptr& result) 
  |             { 
  |                SF3TypeNode* n = dynamic_cast<SF3TypeNode*>(node); 
  |  
  |                if (n) 
  |                { 
  |                   T0 t0 = n->t0(); 
  |                   T1 t1 = n->t1(); 
  |                   T2 t2 = n->t2(); 
  |  
  |                   return synthesize_sf4ext_expression::template compile<ExternalType, T0, T1, T2> 
  |                             (expr_gen, id, t, t0, t1, t2, result); 
  |                } 
  |                else 
  |                   return false; 
  |             } 
  |  
  |             template <typename SF3TypeNode, typename ExternalType, typename T0, typename T1, typename T2> 
  |             static inline bool compile_left_impl(expression_generator<Type>& expr_gen, 
  |                                                  const std::string& id, 
  |                                                  ExternalType t, 
  |                                                  expression_node_ptr& node, 
  |                                                  expression_node_ptr& result) 
  |             { 
  |                SF3TypeNode* n = dynamic_cast<SF3TypeNode*>(node); 
  |  
  |                if (n) 
  |                { 
  |                   T0 t0 = n->t0(); 
  |                   T1 t1 = n->t1(); 
  |                   T2 t2 = n->t2(); 
  |  
  |                   return synthesize_sf4ext_expression::template compile<T0, T1, T2, ExternalType> 
  |                             (expr_gen, id, t0, t1, t2, t, result); 
  |                } 
  |                else 
  |                   return false; 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovov_expression0 
  |          { 
  |             typedef typename vovov_t::type0 node_type; 
  |             typedef typename vovov_t::sf3_type sf3_type; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (v0 o0 v1) o1 (v2) 
  |                const details::vov_base_node<Type>* vov = static_cast<details::vov_base_node<Type>*>(branch[0]); 
  |                const Type& v0 = vov->v0(); 
  |                const Type& v1 = vov->v1(); 
  |                const Type& v2 = static_cast<details::variable_node<Type>*>(branch[1])->ref(); 
  |                const details::operator_type o0 = vov->operation(); 
  |                const details::operator_type o1 = operation; 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // (v0 / v1) / v2 --> (vovov) v0 / (v1 * v2) 
  |                   if ((details::e_div == o0) && (details::e_div == o1)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<vtype, vtype, vtype>(expr_gen, "t/(t*t)", v0, v1, v2, result); 
  |  
  |                      exprtk_debug(("(v0 / v1) / v2 --> (vovov) v0 / (v1 * v2)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf3ext_expression::template compile<vtype, vtype, vtype> 
  |                      (expr_gen, id(expr_gen, o0, o1), v0, v1, v2, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, v2, f0, f1); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "t)" << expr_gen.to_str(o1) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovov_expression1 
  |          { 
  |             typedef typename vovov_t::type1 node_type; 
  |             typedef typename vovov_t::sf3_type sf3_type; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (v0) o0 (v1 o1 v2) 
  |                const details::vov_base_node<Type>* vov = static_cast<details::vov_base_node<Type>*>(branch[1]); 
  |                const Type& v0 = static_cast<details::variable_node<Type>*>(branch[0])->ref(); 
  |                const Type& v1 = vov->v0(); 
  |                const Type& v2 = vov->v1(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = vov->operation(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // v0 / (v1 / v2) --> (vovov) (v0 * v2) / v1 
  |                   if ((details::e_div == o0) && (details::e_div == o1)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<vtype, vtype, vtype>(expr_gen, "(t*t)/t", v0, v2, v1, result); 
  |  
  |                      exprtk_debug(("v0 / (v1 / v2) --> (vovov) (v0 * v2) / v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf3ext_expression::template compile<vtype, vtype, vtype> 
  |                      (expr_gen, id(expr_gen, o0, o1), v0, v1, v2, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, v2, f0, f1); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1) 
  |             { 
  |                return details::build_string() 
  |                   << "t"  << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovoc_expression0 
  |          { 
  |             typedef typename vovoc_t::type0 node_type; 
  |             typedef typename vovoc_t::sf3_type sf3_type; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (v0 o0 v1) o1 (c) 
  |                const details::vov_base_node<Type>* vov = static_cast<details::vov_base_node<Type>*>(branch[0]); 
  |                const Type& v0 = vov->v0(); 
  |                const Type& v1 = vov->v1(); 
  |                const Type   c = static_cast<details::literal_node<Type>*>(branch[1])->value(); 
  |                const details::operator_type o0 = vov->operation(); 
  |                const details::operator_type o1 = operation; 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // (v0 / v1) / c --> (vovoc) v0 / (v1 * c) 
  |                   if ((details::e_div == o0) && (details::e_div == o1)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<vtype, vtype, ctype>(expr_gen, "t/(t*t)", v0, v1, c, result); 
  |  
  |                      exprtk_debug(("(v0 / v1) / c --> (vovoc) v0 / (v1 * c)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf3ext_expression::template compile<vtype, vtype, ctype> 
  |                      (expr_gen, id(expr_gen, o0, o1), v0, v1, c, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, c, f0, f1); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "t)" << expr_gen.to_str(o1) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovoc_expression1 
  |          { 
  |             typedef typename vovoc_t::type1 node_type; 
  |             typedef typename vovoc_t::sf3_type sf3_type; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (v0) o0 (v1 o1 c) 
  |                const details::voc_base_node<Type>* voc = static_cast<const details::voc_base_node<Type>*>(branch[1]); 
  |                const Type& v0 = static_cast<details::variable_node<Type>*>(branch[0])->ref(); 
  |                const Type& v1 = voc->v(); 
  |                const Type   c = voc->c(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = voc->operation(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // v0 / (v1 / c) --> (vocov) (v0 * c) / v1 
  |                   if ((details::e_div == o0) && (details::e_div == o1)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<vtype, ctype, vtype>(expr_gen, "(t*t)/t", v0, c, v1, result); 
  |  
  |                      exprtk_debug(("v0 / (v1 / c) --> (vocov) (v0 * c) / v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf3ext_expression::template compile<vtype, vtype, ctype> 
  |                      (expr_gen, id(expr_gen, o0, o1), v0, v1, c, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, c, f0, f1); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1) 
  |             { 
  |                return details::build_string() 
  |                   << "t"  << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vocov_expression0 
  |          { 
  |             typedef typename vocov_t::type0 node_type; 
  |             typedef typename vocov_t::sf3_type sf3_type; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (v0 o0 c) o1 (v1) 
  |                const details::voc_base_node<Type>* voc = static_cast<details::voc_base_node<Type>*>(branch[0]); 
  |                const Type& v0 = voc->v(); 
  |                const Type   c = voc->c(); 
  |                const Type& v1 = static_cast<details::variable_node<Type>*>(branch[1])->ref(); 
  |                const details::operator_type o0 = voc->operation(); 
  |                const details::operator_type o1 = operation; 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // (v0 / c) / v1 --> (vovoc) v0 / (v1 * c) 
  |                   if ((details::e_div == o0) && (details::e_div == o1)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<vtype, vtype, ctype>(expr_gen, "t/(t*t)", v0, v1, c, result); 
  |  
  |                      exprtk_debug(("(v0 / c) / v1 --> (vovoc) v0 / (v1 * c)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf3ext_expression::template compile<vtype, ctype, vtype> 
  |                      (expr_gen, id(expr_gen, o0, o1), v0, c, v1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), v0, c, v1, f0, f1); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "t)" << expr_gen.to_str(o1) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vocov_expression1 
  |          { 
  |             typedef typename vocov_t::type1 node_type; 
  |             typedef typename vocov_t::sf3_type sf3_type; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (v0) o0 (c o1 v1) 
  |                const details::cov_base_node<Type>* cov = static_cast<details::cov_base_node<Type>*>(branch[1]); 
  |                const Type& v0 = static_cast<details::variable_node<Type>*>(branch[0])->ref(); 
  |                const Type   c = cov->c(); 
  |                const Type& v1 = cov->v(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = cov->operation(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // v0 / (c / v1) --> (vovoc) (v0 * v1) / c 
  |                   if ((details::e_div == o0) && (details::e_div == o1)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<vtype, vtype, ctype>(expr_gen, "(t*t)/t", v0, v1, c, result); 
  |  
  |                      exprtk_debug(("v0 / (c / v1) --> (vovoc) (v0 * v1) / c\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf3ext_expression::template compile<vtype, ctype, vtype> 
  |                      (expr_gen, id(expr_gen, o0, o1), v0, c, v1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), v0, c, v1, f0, f1); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1) 
  |             { 
  |                return details::build_string() 
  |                   << "t"  << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covov_expression0 
  |          { 
  |             typedef typename covov_t::type0 node_type; 
  |             typedef typename covov_t::sf3_type sf3_type; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (c o0 v0) o1 (v1) 
  |                const details::cov_base_node<Type>* cov = static_cast<details::cov_base_node<Type>*>(branch[0]); 
  |                const Type   c = cov->c(); 
  |                const Type& v0 = cov->v(); 
  |                const Type& v1 = static_cast<details::variable_node<Type>*>(branch[1])->ref(); 
  |                const details::operator_type o0 = cov->operation(); 
  |                const details::operator_type o1 = operation; 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // (c / v0) / v1 --> (covov) c / (v0 * v1) 
  |                   if ((details::e_div == o0) && (details::e_div == o1)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "t/(t*t)", c, v0, v1, result); 
  |  
  |                      exprtk_debug(("(c / v0) / v1 --> (covov) c / (v0 * v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf3ext_expression::template compile<ctype, vtype, vtype> 
  |                      (expr_gen, id(expr_gen, o0, o1), c, v0, v1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), c, v0, v1, f0, f1); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "t)" << expr_gen.to_str(o1) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covov_expression1 
  |          { 
  |             typedef typename covov_t::type1 node_type; 
  |             typedef typename covov_t::sf3_type sf3_type; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (c) o0 (v0 o1 v1) 
  |                const details::vov_base_node<Type>* vov = static_cast<details::vov_base_node<Type>*>(branch[1]); 
  |                const Type   c = static_cast<details::literal_node<Type>*>(branch[0])->value(); 
  |                const Type& v0 = vov->v0(); 
  |                const Type& v1 = vov->v1(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = vov->operation(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // c / (v0 / v1) --> (covov) (c * v1) / v0 
  |                   if ((details::e_div == o0) && (details::e_div == o1)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t*t)/t", c, v1, v0, result); 
  |  
  |                      exprtk_debug(("c / (v0 / v1) --> (covov) (c * v1) / v0\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf3ext_expression::template compile<ctype, vtype, vtype> 
  |                      (expr_gen, id(expr_gen, o0, o1), c, v0, v1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), c, v0, v1, f0, f1); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1) 
  |             { 
  |                return details::build_string() 
  |                   << "t"  << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covoc_expression0 
  |          { 
  |             typedef typename covoc_t::type0 node_type; 
  |             typedef typename covoc_t::sf3_type sf3_type; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (c0 o0 v) o1 (c1) 
  |                const details::cov_base_node<Type>* cov = static_cast<details::cov_base_node<Type>*>(branch[0]); 
  |                const Type  c0 = cov->c(); 
  |                const Type&  v = cov->v(); 
  |                const Type  c1 = static_cast<details::literal_node<Type>*>(branch[1])->value(); 
  |                const details::operator_type o0 = cov->operation(); 
  |                const details::operator_type o1 = operation; 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // (c0 + v) + c1 --> (cov) (c0 + c1) + v 
  |                   if ((details::e_add == o0) && (details::e_add == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0 + v) + c1 --> (cov) (c0 + c1) + v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::add_op<Type> > >(c0 + c1, v); 
  |                   } 
  |                   // (c0 + v) - c1 --> (cov) (c0 - c1) + v 
  |                   else if ((details::e_add == o0) && (details::e_sub == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0 + v) - c1 --> (cov) (c0 - c1) + v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::add_op<Type> > >(c0 - c1, v); 
  |                   } 
  |                   // (c0 - v) + c1 --> (cov) (c0 + c1) - v 
  |                   else if ((details::e_sub == o0) && (details::e_add == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0 - v) + c1 --> (cov) (c0 + c1) - v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::sub_op<Type> > >(c0 + c1, v); 
  |                   } 
  |                   // (c0 - v) - c1 --> (cov) (c0 - c1) - v 
  |                   else if ((details::e_sub == o0) && (details::e_sub == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0 - v) - c1 --> (cov) (c0 - c1) - v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::sub_op<Type> > >(c0 - c1, v); 
  |                   } 
  |                   // (c0 * v) * c1 --> (cov) (c0 * c1) * v 
  |                   else if ((details::e_mul == o0) && (details::e_mul == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0 * v) * c1 --> (cov) (c0 * c1) * v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::mul_op<Type> > >(c0 * c1, v); 
  |                   } 
  |                   // (c0 * v) / c1 --> (cov) (c0 / c1) * v 
  |                   else if ((details::e_mul == o0) && (details::e_div == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0 * v) / c1 --> (cov) (c0 / c1) * v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::mul_op<Type> > >(c0 / c1, v); 
  |                   } 
  |                   // (c0 / v) * c1 --> (cov) (c0 * c1) / v 
  |                   else if ((details::e_div == o0) && (details::e_mul == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0 / v) * c1 --> (cov) (c0 * c1) / v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::div_op<Type> > >(c0 * c1, v); 
  |                   } 
  |                   // (c0 / v) / c1 --> (cov) (c0 / c1) / v 
  |                   else if ((details::e_div == o0) && (details::e_div == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0 / v) / c1 --> (cov) (c0 / c1) / v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::div_op<Type> > >(c0 / c1, v); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf3ext_expression::template compile<ctype, vtype, ctype> 
  |                      (expr_gen, id(expr_gen, o0, o1), c0, v, c1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), c0, v, c1, f0, f1); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "t)" << expr_gen.to_str(o1) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covoc_expression1 
  |          { 
  |             typedef typename covoc_t::type1 node_type; 
  |             typedef typename covoc_t::sf3_type sf3_type; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (c0) o0 (v o1 c1) 
  |                const details::voc_base_node<Type>* voc = static_cast<details::voc_base_node<Type>*>(branch[1]); 
  |                const Type  c0 = static_cast<details::literal_node<Type>*>(branch[0])->value(); 
  |                const Type&  v = voc->v(); 
  |                const Type  c1 = voc->c(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = voc->operation(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // (c0) + (v + c1) --> (cov) (c0 + c1) + v 
  |                   if ((details::e_add == o0) && (details::e_add == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0) + (v + c1) --> (cov) (c0 + c1) + v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::add_op<Type> > >(c0 + c1, v); 
  |                   } 
  |                   // (c0) + (v - c1) --> (cov) (c0 - c1) + v 
  |                   else if ((details::e_add == o0) && (details::e_sub == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0) + (v - c1) --> (cov) (c0 - c1) + v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::add_op<Type> > >(c0 - c1, v); 
  |                   } 
  |                   // (c0) - (v + c1) --> (cov) (c0 - c1) - v 
  |                   else if ((details::e_sub == o0) && (details::e_add == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0) - (v + c1) --> (cov) (c0 - c1) - v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::sub_op<Type> > >(c0 - c1, v); 
  |                   } 
  |                   // (c0) - (v - c1) --> (cov) (c0 + c1) - v 
  |                   else if ((details::e_sub == o0) && (details::e_sub == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0) - (v - c1) --> (cov) (c0 + c1) - v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::sub_op<Type> > >(c0 + c1, v); 
  |                   } 
  |                   // (c0) * (v * c1) --> (voc) v * (c0 * c1) 
  |                   else if ((details::e_mul == o0) && (details::e_mul == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0) * (v * c1) --> (voc) v * (c0 * c1)\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::mul_op<Type> > >(c0 * c1, v); 
  |                   } 
  |                   // (c0) * (v / c1) --> (cov) (c0 / c1) * v 
  |                   else if ((details::e_mul == o0) && (details::e_div == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0) * (v / c1) --> (cov) (c0 / c1) * v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::mul_op<Type> > >(c0 / c1, v); 
  |                   } 
  |                   // (c0) / (v * c1) --> (cov) (c0 / c1) / v 
  |                   else if ((details::e_div == o0) && (details::e_mul == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0) / (v * c1) --> (cov) (c0 / c1) / v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::div_op<Type> > >(c0 / c1, v); 
  |                   } 
  |                   // (c0) / (v / c1) --> (cov) (c0 * c1) / v 
  |                   else if ((details::e_div == o0) && (details::e_div == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0) / (v / c1) --> (cov) (c0 * c1) / v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::div_op<Type> > >(c0 * c1, v); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf3ext_expression::template compile<ctype, vtype, ctype> 
  |                      (expr_gen, id(expr_gen, o0, o1), c0, v, c1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), c0, v, c1, f0, f1); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1) 
  |             { 
  |                return details::build_string() 
  |                   << "t"  << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_cocov_expression0 
  |          { 
  |             typedef typename cocov_t::type0 node_type; 
  |             static inline expression_node_ptr process(expression_generator<Type>&, 
  |                                                       const details::operator_type&, 
  |                                                       expression_node_ptr (&)[2]) 
  |             { 
  |                // (c0 o0 c1) o1 (v) - Not possible. 
  |                return error_node(); 
  |             } 
  |          }; 
  |  
  |          struct synthesize_cocov_expression1 
  |          { 
  |             typedef typename cocov_t::type1 node_type; 
  |             typedef typename cocov_t::sf3_type sf3_type; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (c0) o0 (c1 o1 v) 
  |                const details::cov_base_node<Type>* cov = static_cast<details::cov_base_node<Type>*>(branch[1]); 
  |                const Type  c0 = static_cast<details::literal_node<Type>*>(branch[0])->value(); 
  |                const Type  c1 = cov->c(); 
  |                const Type&  v = cov->v(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = cov->operation(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // (c0) + (c1 + v) --> (cov) (c0 + c1) + v 
  |                   if ((details::e_add == o0) && (details::e_add == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0) + (c1 + v) --> (cov) (c0 + c1) + v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::add_op<Type> > >(c0 + c1, v); 
  |                   } 
  |                   // (c0) + (c1 - v) --> (cov) (c0 + c1) - v 
  |                   else if ((details::e_add == o0) && (details::e_sub == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0) + (c1 - v) --> (cov) (c0 + c1) - v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::sub_op<Type> > >(c0 + c1, v); 
  |                   } 
  |                   // (c0) - (c1 + v) --> (cov) (c0 - c1) - v 
  |                   else if ((details::e_sub == o0) && (details::e_add == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0) - (c1 + v) --> (cov) (c0 - c1) - v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::sub_op<Type> > >(c0 - c1, v); 
  |                   } 
  |                   // (c0) - (c1 - v) --> (cov) (c0 - c1) + v 
  |                   else if ((details::e_sub == o0) && (details::e_sub == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0) - (c1 - v) --> (cov) (c0 - c1) + v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::add_op<Type> > >(c0 - c1, v); 
  |                   } 
  |                   // (c0) * (c1 * v) --> (cov) (c0 * c1) * v 
  |                   else if ((details::e_mul == o0) && (details::e_mul == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0) * (c1 * v) --> (cov) (c0 * c1) * v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::mul_op<Type> > >(c0 * c1, v); 
  |                   } 
  |                   // (c0) * (c1 / v) --> (cov) (c0 * c1) / v 
  |                   else if ((details::e_mul == o0) && (details::e_div == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0) * (c1 / v) --> (cov) (c0 * c1) / v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::div_op<Type> > >(c0 * c1, v); 
  |                   } 
  |                   // (c0) / (c1 * v) --> (cov) (c0 / c1) / v 
  |                   else if ((details::e_div == o0) && (details::e_mul == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0) / (c1 * v) --> (cov) (c0 / c1) / v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::div_op<Type> > >(c0 / c1, v); 
  |                   } 
  |                   // (c0) / (c1 / v) --> (cov) (c0 / c1) * v 
  |                   else if ((details::e_div == o0) && (details::e_div == o1)) 
  |                   { 
  |                      exprtk_debug(("(c0) / (c1 / v) --> (cov) (c0 / c1) * v\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_cr<typename details::cov_node<Type,details::mul_op<Type> > >(c0 / c1, v); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf3ext_expression::template compile<ctype, ctype, vtype> 
  |                      (expr_gen, id(expr_gen, o0, o1), c0, c1, v, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), c0, c1, v, f0, f1); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1) 
  |             { 
  |                return details::build_string() 
  |                   << "t"  << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vococ_expression0 
  |          { 
  |             typedef typename vococ_t::type0 node_type; 
  |             typedef typename vococ_t::sf3_type sf3_type; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (v o0 c0) o1 (c1) 
  |                const details::voc_base_node<Type>* voc = static_cast<details::voc_base_node<Type>*>(branch[0]); 
  |                const Type&  v = voc->v(); 
  |                const Type& c0 = voc->c(); 
  |                const Type& c1 = static_cast<details::literal_node<Type>*>(branch[1])->value(); 
  |                const details::operator_type o0 = voc->operation(); 
  |                const details::operator_type o1 = operation; 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // (v + c0) + c1 --> (voc) v + (c0 + c1) 
  |                   if ((details::e_add == o0) && (details::e_add == o1)) 
  |                   { 
  |                      exprtk_debug(("(v + c0) + c1 --> (voc) v + (c0 + c1)\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_rc<typename details::voc_node<Type,details::add_op<Type> > >(v, c0 + c1); 
  |                   } 
  |                   // (v + c0) - c1 --> (voc) v + (c0 - c1) 
  |                   else if ((details::e_add == o0) && (details::e_sub == o1)) 
  |                   { 
  |                      exprtk_debug(("(v + c0) - c1 --> (voc) v + (c0 - c1)\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_rc<typename details::voc_node<Type,details::add_op<Type> > >(v, c0 - c1); 
  |                   } 
  |                   // (v - c0) + c1 --> (voc) v - (c0 + c1) 
  |                   else if ((details::e_sub == o0) && (details::e_add == o1)) 
  |                   { 
  |                      exprtk_debug(("(v - c0) + c1 --> (voc) v - (c0 + c1)\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_rc<typename details::voc_node<Type,details::add_op<Type> > >(v, c1 - c0); 
  |                   } 
  |                   // (v - c0) - c1 --> (voc) v - (c0 + c1) 
  |                   else if ((details::e_sub == o0) && (details::e_sub == o1)) 
  |                   { 
  |                      exprtk_debug(("(v - c0) - c1 --> (voc) v - (c0 + c1)\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_rc<typename details::voc_node<Type,details::sub_op<Type> > >(v, c0 + c1); 
  |                   } 
  |                   // (v * c0) * c1 --> (voc) v * (c0 * c1) 
  |                   else if ((details::e_mul == o0) && (details::e_mul == o1)) 
  |                   { 
  |                      exprtk_debug(("(v * c0) * c1 --> (voc) v * (c0 * c1)\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_rc<typename details::voc_node<Type,details::mul_op<Type> > >(v, c0 * c1); 
  |                   } 
  |                   // (v * c0) / c1 --> (voc) v * (c0 / c1) 
  |                   else if ((details::e_mul == o0) && (details::e_div == o1)) 
  |                   { 
  |                      exprtk_debug(("(v * c0) / c1 --> (voc) v * (c0 / c1)\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_rc<typename details::voc_node<Type,details::mul_op<Type> > >(v, c0 / c1); 
  |                   } 
  |                   // (v / c0) * c1 --> (voc) v * (c1 / c0) 
  |                   else if ((details::e_div == o0) && (details::e_mul == o1)) 
  |                   { 
  |                      exprtk_debug(("(v / c0) * c1 --> (voc) v * (c1 / c0)\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_rc<typename details::voc_node<Type,details::mul_op<Type> > >(v, c1 / c0); 
  |                   } 
  |                   // (v / c0) / c1 --> (voc) v / (c0 * c1) 
  |                   else if ((details::e_div == o0) && (details::e_div == o1)) 
  |                   { 
  |                      exprtk_debug(("(v / c0) / c1 --> (voc) v / (c0 * c1)\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_rc<typename details::voc_node<Type,details::div_op<Type> > >(v, c0 * c1); 
  |                   } 
  |                   // (v ^ c0) ^ c1 --> (voc) v ^ (c0 * c1) 
  |                   else if ((details::e_pow == o0) && (details::e_pow == o1)) 
  |                   { 
  |                      exprtk_debug(("(v ^ c0) ^ c1 --> (voc) v ^ (c0 * c1)\n")); 
  |  
  |                      return expr_gen.node_allocator_-> 
  |                                template allocate_rc<typename details::voc_node<Type,details::pow_op<Type> > >(v, c0 * c1); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf3ext_expression::template compile<vtype, ctype, ctype> 
  |                      (expr_gen, id(expr_gen, o0, o1), v, c0, c1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), v, c0, c1, f0, f1); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "t)" << expr_gen.to_str(o1) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vococ_expression1 
  |          { 
  |             typedef typename vococ_t::type0 node_type; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>&, 
  |                                                       const details::operator_type&, 
  |                                                       expression_node_ptr (&)[2]) 
  |             { 
  |                // (v) o0 (c0 o1 c1) - Not possible. 
  |                exprtk_debug(("(v) o0 (c0 o1 c1) - Not possible.\n")); 
  |                return error_node(); 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovovov_expression0 
  |          { 
  |             typedef typename vovovov_t::type0 node_type; 
  |             typedef typename vovovov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (v0 o0 v1) o1 (v2 o2 v3) 
  |                const details::vov_base_node<Type>* vov0 = static_cast<details::vov_base_node<Type>*>(branch[0]); 
  |                const details::vov_base_node<Type>* vov1 = static_cast<details::vov_base_node<Type>*>(branch[1]); 
  |                const Type& v0 = vov0->v0(); 
  |                const Type& v1 = vov0->v1(); 
  |                const Type& v2 = vov1->v0(); 
  |                const Type& v3 = vov1->v1(); 
  |                const details::operator_type o0 = vov0->operation(); 
  |                const details::operator_type o1 = operation; 
  |                const details::operator_type o2 = vov1->operation(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // (v0 / v1) * (v2 / v3) --> (vovovov) (v0 * v2) / (v1 * v3) 
  |                   if ((details::e_div == o0) && (details::e_mul == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf4ext_expression:: 
  |                            template compile<vtype, vtype, vtype, vtype>(expr_gen, "(t*t)/(t*t)", v0, v2, v1, v3, result); 
  |  
  |                      exprtk_debug(("(v0 / v1) * (v2 / v3) --> (vovovov) (v0 * v2) / (v1 * v3)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 / v1) / (v2 / v3) --> (vovovov) (v0 * v3) / (v1 * v2) 
  |                   else if ((details::e_div == o0) && (details::e_div == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf4ext_expression:: 
  |                            template compile<vtype, vtype, vtype, vtype>(expr_gen, "(t*t)/(t*t)", v0, v3, v1, v2, result); 
  |  
  |                      exprtk_debug(("(v0 / v1) / (v2 / v3) --> (vovovov) (v0 * v3) / (v1 * v2)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 + v1) / (v2 / v3) --> (vovovov) (v0 + v1) * (v3 / v2) 
  |                   else if ((details::e_add == o0) && (details::e_div == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf4ext_expression:: 
  |                            template compile<vtype, vtype, vtype, vtype>(expr_gen, "(t+t)*(t/t)", v0, v1, v3, v2, result); 
  |  
  |                      exprtk_debug(("(v0 + v1) / (v2 / v3) --> (vovovov) (v0 + v1) * (v3 / v2)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 - v1) / (v2 / v3) --> (vovovov) (v0 + v1) * (v3 / v2) 
  |                   else if ((details::e_sub == o0) && (details::e_div == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf4ext_expression:: 
  |                            template compile<vtype, vtype, vtype, vtype>(expr_gen, "(t-t)*(t/t)", v0, v1, v3, v2, result); 
  |  
  |                      exprtk_debug(("(v0 - v1) / (v2 / v3) --> (vovovov) (v0 - v1) * (v3 / v2)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 * v1) / (v2 / v3) --> (vovovov) ((v0 * v1) * v3) / v2 
  |                   else if ((details::e_mul == o0) && (details::e_div == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf4ext_expression:: 
  |                            template compile<vtype, vtype, vtype, vtype>(expr_gen, "((t*t)*t)/t", v0, v1, v3, v2, result); 
  |  
  |                      exprtk_debug(("(v0 * v1) / (v2 / v3) --> (vovovov) ((v0 * v1) * v3) / v2\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, v1, v2, v3, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, v2, v3, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "t)" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovovoc_expression0 
  |          { 
  |             typedef typename vovovoc_t::type0 node_type; 
  |             typedef typename vovovoc_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (v0 o0 v1) o1 (v2 o2 c) 
  |                const details::vov_base_node<Type>* vov = static_cast<details::vov_base_node<Type>*>(branch[0]); 
  |                const details::voc_base_node<Type>* voc = static_cast<details::voc_base_node<Type>*>(branch[1]); 
  |                const Type& v0 = vov->v0(); 
  |                const Type& v1 = vov->v1(); 
  |                const Type& v2 = voc->v (); 
  |                const Type   c = voc->c (); 
  |                const details::operator_type o0 = vov->operation(); 
  |                const details::operator_type o1 = operation; 
  |                const details::operator_type o2 = voc->operation(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // (v0 / v1) * (v2 / c) --> (vovovoc) (v0 * v2) / (v1 * c) 
  |                   if ((details::e_div == o0) && (details::e_mul == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf4ext_expression:: 
  |                            template compile<vtype, vtype, vtype, ctype>(expr_gen, "(t*t)/(t*t)", v0, v2, v1, c, result); 
  |  
  |                      exprtk_debug(("(v0 / v1) * (v2 / c) --> (vovovoc) (v0 * v2) / (v1 * c)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 / v1) / (v2 / c) --> (vocovov) (v0 * c) / (v1 * v2) 
  |                   if ((details::e_div == o0) && (details::e_div == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf4ext_expression:: 
  |                            template compile<vtype, ctype, vtype, vtype>(expr_gen, "(t*t)/(t*t)", v0, c, v1, v2, result); 
  |  
  |                      exprtk_debug(("(v0 / v1) / (v2 / c) --> (vocovov) (v0 * c) / (v1 * v2)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, v1, v2, c, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, v2, c, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "t)" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovocov_expression0 
  |          { 
  |             typedef typename vovocov_t::type0 node_type; 
  |             typedef typename vovocov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (v0 o0 v1) o1 (c o2 v2) 
  |                const details::vov_base_node<Type>* vov = static_cast<details::vov_base_node<Type>*>(branch[0]); 
  |                const details::cov_base_node<Type>* cov = static_cast<details::cov_base_node<Type>*>(branch[1]); 
  |                const Type& v0 = vov->v0(); 
  |                const Type& v1 = vov->v1(); 
  |                const Type& v2 = cov->v (); 
  |                const Type   c = cov->c (); 
  |                const details::operator_type o0 = vov->operation(); 
  |                const details::operator_type o1 = operation; 
  |                const details::operator_type o2 = cov->operation(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // (v0 / v1) * (c / v2) --> (vocovov) (v0 * c) / (v1 * v2) 
  |                   if ((details::e_div == o0) && (details::e_mul == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf4ext_expression:: 
  |                            template compile<vtype, ctype, vtype, vtype>(expr_gen, "(t*t)/(t*t)", v0, c, v1, v2, result); 
  |  
  |                      exprtk_debug(("(v0 / v1) * (c / v2) --> (vocovov) (v0 * c) / (v1 * v2)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 / v1) / (c / v2) --> (vovovoc) (v0 * v2) / (v1 * c) 
  |                   if ((details::e_div == o0) && (details::e_div == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf4ext_expression:: 
  |                            template compile<vtype, vtype, vtype, ctype>(expr_gen, "(t*t)/(t*t)", v0, v2, v1, c, result); 
  |  
  |                      exprtk_debug(("(v0 / v1) / (c / v2) --> (vovovoc) (v0 * v2) / (v1 * c)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, v1, c, v2, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, c, v2, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "t)" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vocovov_expression0 
  |          { 
  |             typedef typename vocovov_t::type0 node_type; 
  |             typedef typename vocovov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (v0 o0 c) o1 (v1 o2 v2) 
  |                const details::voc_base_node<Type>* voc = static_cast<details::voc_base_node<Type>*>(branch[0]); 
  |                const details::vov_base_node<Type>* vov = static_cast<details::vov_base_node<Type>*>(branch[1]); 
  |                const Type   c = voc->c (); 
  |                const Type& v0 = voc->v (); 
  |                const Type& v1 = vov->v0(); 
  |                const Type& v2 = vov->v1(); 
  |                const details::operator_type o0 = voc->operation(); 
  |                const details::operator_type o1 = operation; 
  |                const details::operator_type o2 = vov->operation(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // (v0 / c) * (v1 / v2) --> (vovocov) (v0 * v1) / (c * v2) 
  |                   if ((details::e_div == o0) && (details::e_mul == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf4ext_expression:: 
  |                            template compile<vtype, vtype, ctype, vtype>(expr_gen, "(t*t)/(t*t)", v0, v1, c, v2, result); 
  |  
  |                      exprtk_debug(("(v0 / c) * (v1 / v2) --> (vovocov) (v0 * v1) / (c * v2)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 / c) / (v1 / v2) --> (vovocov) (v0 * v2) / (c * v1) 
  |                   if ((details::e_div == o0) && (details::e_div == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf4ext_expression:: 
  |                            template compile<vtype, vtype, ctype, vtype>(expr_gen, "(t*t)/(t*t)", v0, v2, c, v1, result); 
  |  
  |                      exprtk_debug(("(v0 / c) / (v1 / v2) --> (vovocov) (v0 * v2) / (c * v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, c, v1, v2, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), v0, c, v1, v2, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "t)" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covovov_expression0 
  |          { 
  |             typedef typename covovov_t::type0 node_type; 
  |             typedef typename covovov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (c o0 v0) o1 (v1 o2 v2) 
  |                const details::cov_base_node<Type>* cov = static_cast<details::cov_base_node<Type>*>(branch[0]); 
  |                const details::vov_base_node<Type>* vov = static_cast<details::vov_base_node<Type>*>(branch[1]); 
  |                const Type   c = cov->c (); 
  |                const Type& v0 = cov->v (); 
  |                const Type& v1 = vov->v0(); 
  |                const Type& v2 = vov->v1(); 
  |                const details::operator_type o0 = cov->operation(); 
  |                const details::operator_type o1 = operation; 
  |                const details::operator_type o2 = vov->operation(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // (c / v0) * (v1 / v2) --> (covovov) (c * v1) / (v0 * v2) 
  |                   if ((details::e_div == o0) && (details::e_mul == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf4ext_expression:: 
  |                            template compile<ctype, vtype, vtype, vtype>(expr_gen, "(t*t)/(t*t)", c, v1, v0, v2, result); 
  |  
  |                      exprtk_debug(("(c / v0) * (v1 / v2) --> (covovov) (c * v1) / (v0 * v2)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c / v0) / (v1 / v2) --> (covovov) (c * v2) / (v0 * v1) 
  |                   if ((details::e_div == o0) && (details::e_div == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf4ext_expression:: 
  |                            template compile<ctype, vtype, vtype, vtype>(expr_gen, "(t*t)/(t*t)", c, v2, v0, v1, result); 
  |  
  |                      exprtk_debug(("(c / v0) / (v1 / v2) --> (covovov) (c * v2) / (v0 * v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), c, v0, v1, v2, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), c, v0, v1, v2, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "t)" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covocov_expression0 
  |          { 
  |             typedef typename covocov_t::type0 node_type; 
  |             typedef typename covocov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (c0 o0 v0) o1 (c1 o2 v1) 
  |                const details::cov_base_node<Type>* cov0 = static_cast<details::cov_base_node<Type>*>(branch[0]); 
  |                const details::cov_base_node<Type>* cov1 = static_cast<details::cov_base_node<Type>*>(branch[1]); 
  |                const Type  c0 = cov0->c(); 
  |                const Type& v0 = cov0->v(); 
  |                const Type  c1 = cov1->c(); 
  |                const Type& v1 = cov1->v(); 
  |                const details::operator_type o0 = cov0->operation(); 
  |                const details::operator_type o1 = operation; 
  |                const details::operator_type o2 = cov1->operation(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // (c0 + v0) + (c1 + v1) --> (covov) (c0 + c1) + v0 + v1 
  |                   if ((details::e_add == o0) && (details::e_add == o1) && (details::e_add == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t+t)+t", (c0 + c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(c0 + v0) + (c1 + v1) --> (covov) (c0 + c1) + v0 + v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c0 + v0) - (c1 + v1) --> (covov) (c0 - c1) + v0 - v1 
  |                   else if ((details::e_add == o0) && (details::e_sub == o1) && (details::e_add == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t+t)-t", (c0 - c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(c0 + v0) - (c1 + v1) --> (covov) (c0 - c1) + v0 - v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c0 - v0) - (c1 - v1) --> (covov) (c0 - c1) - v0 + v1 
  |                   else if ((details::e_sub == o0) && (details::e_sub == o1) && (details::e_sub == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t-t)+t", (c0 - c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(c0 - v0) - (c1 - v1) --> (covov) (c0 - c1) - v0 + v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c0 * v0) * (c1 * v1) --> (covov) (c0 * c1) * v0 * v1 
  |                   else if ((details::e_mul == o0) && (details::e_mul == o1) && (details::e_mul == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t*t)*t", (c0 * c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(c0 * v0) * (c1 * v1) --> (covov) (c0 * c1) * v0 * v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c0 * v0) / (c1 * v1) --> (covov) (c0 / c1) * (v0 / v1) 
  |                   else if ((details::e_mul == o0) && (details::e_div == o1) && (details::e_mul == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t*t)/t", (c0 / c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(c0 * v0) / (c1 * v1) --> (covov) (c0 / c1) * (v0 / v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c0 / v0) * (c1 / v1) --> (covov) (c0 * c1) / (v0 * v1) 
  |                   else if ((details::e_div == o0) && (details::e_mul == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "t/(t*t)", (c0 * c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(c0 / v0) * (c1 / v1) --> (covov) (c0 * c1) / (v0 * v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c0 / v0) / (c1 / v1) --> (covov) ((c0 / c1) * v1) / v0 
  |                   else if ((details::e_div == o0) && (details::e_div == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t*t)/t", (c0 / c1), v1, v0, result); 
  |  
  |                      exprtk_debug(("(c0 / v0) / (c1 / v1) --> (covov) ((c0 / c1) * v1) / v0\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c0 * v0) / (c1 / v1) --> (covov) (c0 / c1) * (v0 * v1) 
  |                   else if ((details::e_mul == o0) && (details::e_div == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "t*(t*t)", (c0 / c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(c0 * v0) / (c1 / v1) --> (covov) (c0 / c1) * (v0 * v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c0 / v0) / (c1 * v1) --> (covov) (c0 / c1) / (v0 * v1) 
  |                   else if ((details::e_div == o0) && (details::e_div == o1) && (details::e_mul == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "t/(t*t)", (c0 / c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(c0 / v0) / (c1 * v1) --> (covov) (c0 / c1) / (v0 * v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c * v0) +/- (c * v1) --> (covov) c * (v0 +/- v1) 
  |                   else if ( 
  |                             (std::equal_to<T>()(c0,c1)) && 
  |                             (details::e_mul == o0)      && 
  |                             (details::e_mul == o2)      && 
  |                             ( 
  |                               (details::e_add == o1) || 
  |                               (details::e_sub == o1) 
  |                             ) 
  |                           ) 
  |                   { 
  |                      std::string specfunc; 
  |  
  |                      switch (o1) 
  |                      { 
  |                         case details::e_add : specfunc = "t*(t+t)" break; 
  |                         case details::e_sub : specfunc = "t*(t-t)" break; 
  |                         default             : return error_node(); 
  |                      } 
  |  
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, specfunc, c0, v0, v1, result); 
  |  
  |                      exprtk_debug(("(c * v0) +/- (c * v1) --> (covov) c * (v0 +/- v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), c0, v0, c1, v1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), c0, v0, c1, v1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "t)" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vocovoc_expression0 
  |          { 
  |             typedef typename vocovoc_t::type0 node_type; 
  |             typedef typename vocovoc_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (v0 o0 c0) o1 (v1 o2 c1) 
  |                const details::voc_base_node<Type>* voc0 = static_cast<details::voc_base_node<Type>*>(branch[0]); 
  |                const details::voc_base_node<Type>* voc1 = static_cast<details::voc_base_node<Type>*>(branch[1]); 
  |                const Type  c0 = voc0->c(); 
  |                const Type& v0 = voc0->v(); 
  |                const Type  c1 = voc1->c(); 
  |                const Type& v1 = voc1->v(); 
  |                const details::operator_type o0 = voc0->operation(); 
  |                const details::operator_type o1 = operation; 
  |                const details::operator_type o2 = voc1->operation(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // (v0 + c0) + (v1 + c1) --> (covov) (c0 + c1) + v0 + v1 
  |                   if ((details::e_add == o0) && (details::e_add == o1) && (details::e_add == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t+t)+t", (c0 + c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 + c0) + (v1 + c1) --> (covov) (c0 + c1) + v0 + v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 + c0) - (v1 + c1) --> (covov) (c0 - c1) + v0 - v1 
  |                   else if ((details::e_add == o0) && (details::e_sub == o1) && (details::e_add == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t+t)-t", (c0 - c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 + c0) - (v1 + c1) --> (covov) (c0 - c1) + v0 - v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 - c0) - (v1 - c1) --> (covov) (c1 - c0) + v0 - v1 
  |                   else if ((details::e_sub == o0) && (details::e_sub == o1) && (details::e_sub == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t+t)-t", (c1 - c0), v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 - c0) - (v1 - c1) --> (covov) (c1 - c0) + v0 - v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 * c0) * (v1 * c1) --> (covov) (c0 * c1) * v0 * v1 
  |                   else if ((details::e_mul == o0) && (details::e_mul == o1) && (details::e_mul == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t*t)*t", (c0 * c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 * c0) * (v1 * c1) --> (covov) (c0 * c1) * v0 * v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 * c0) / (v1 * c1) --> (covov) (c0 / c1) * (v0 / v1) 
  |                   else if ((details::e_mul == o0) && (details::e_div == o1) && (details::e_mul == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t*t)/t", (c0 / c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 * c0) / (v1 * c1) --> (covov) (c0 / c1) * (v0 / v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 / c0) * (v1 / c1) --> (covov) (1 / (c0 * c1)) * v0 * v1 
  |                   else if ((details::e_div == o0) && (details::e_mul == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t*t)*t", Type(1) / (c0 * c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 / c0) * (v1 / c1) --> (covov) (1 / (c0 * c1)) * v0 * v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 / c0) / (v1 / c1) --> (covov) ((c1 / c0) * v0) / v1 
  |                   else if ((details::e_div == o0) && (details::e_div == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t*t)/t", (c1 / c0), v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 / c0) / (v1 / c1) --> (covov) ((c1 / c0) * v0) / v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 * c0) / (v1 / c1) --> (covov) (c0 * c1) * (v0 / v1) 
  |                   else if ((details::e_mul == o0) && (details::e_div == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "t*(t/t)", (c0 * c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 * c0) / (v1 / c1) --> (covov) (c0 * c1) * (v0 / v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 / c0) / (v1 * c1) --> (covov) (1 / (c0 * c1)) * v0 / v1 
  |                   else if ((details::e_div == o0) && (details::e_div == o1) && (details::e_mul == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "t*(t/t)", Type(1) / (c0 * c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 / c0) / (v1 * c1) --> (covov) (1 / (c0 * c1)) * v0 / v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 / c0) * (v1 + c1) --> (vocovoc) (v0 * (1 / c0)) * (v1 + c1) 
  |                   else if ((details::e_div == o0) && (details::e_mul == o1) && (details::e_add == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf4ext_expression:: 
  |                            template compile<vtype, ctype, vtype, ctype>(expr_gen, "(t*t)*(t+t)", v0, T(1) / c0, v1, c1, result); 
  |  
  |                      exprtk_debug(("(v0 / c0) * (v1 + c1) --> (vocovoc) (v0 * (1 / c0)) * (v1 + c1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 / c0) * (v1 - c1) --> (vocovoc) (v0 * (1 / c0)) * (v1 - c1) 
  |                   else if ((details::e_div == o0) && (details::e_mul == o1) && (details::e_sub == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf4ext_expression:: 
  |                            template compile<vtype, ctype, vtype, ctype>(expr_gen, "(t*t)*(t-t)", v0, T(1) / c0, v1, c1, result); 
  |  
  |                      exprtk_debug(("(v0 / c0) * (v1 - c1) --> (vocovoc) (v0 * (1 / c0)) * (v1 - c1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 * c) +/- (v1 * c) --> (covov) c * (v0 +/- v1) 
  |                   else if ( 
  |                             (std::equal_to<T>()(c0,c1)) && 
  |                             (details::e_mul == o0)      && 
  |                             (details::e_mul == o2)      && 
  |                             ( 
  |                               (details::e_add == o1) || 
  |                               (details::e_sub == o1) 
  |                             ) 
  |                           ) 
  |                   { 
  |                      std::string specfunc; 
  |  
  |                      switch (o1) 
  |                      { 
  |                         case details::e_add : specfunc = "t*(t+t)" break; 
  |                         case details::e_sub : specfunc = "t*(t-t)" break; 
  |                         default             : return error_node(); 
  |                      } 
  |  
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, specfunc, c0, v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 * c) +/- (v1 * c) --> (covov) c * (v0 +/- v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 / c) +/- (v1 / c) --> (vovoc) (v0 +/- v1) / c 
  |                   else if ( 
  |                             (std::equal_to<T>()(c0,c1)) && 
  |                             (details::e_div == o0)      && 
  |                             (details::e_div == o2)      && 
  |                             ( 
  |                               (details::e_add == o1) || 
  |                               (details::e_sub == o1) 
  |                             ) 
  |                           ) 
  |                   { 
  |                      std::string specfunc; 
  |  
  |                      switch (o1) 
  |                      { 
  |                         case details::e_add : specfunc = "(t+t)/t" break; 
  |                         case details::e_sub : specfunc = "(t-t)/t" break; 
  |                         default             : return error_node(); 
  |                      } 
  |  
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<vtype, vtype, ctype>(expr_gen, specfunc, v0, v1, c0, result); 
  |  
  |                      exprtk_debug(("(v0 / c) +/- (v1 / c) --> (vovoc) (v0 +/- v1) / c\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, c0, v1, c1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), v0, c0, v1, c1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "t)" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covovoc_expression0 
  |          { 
  |             typedef typename covovoc_t::type0 node_type; 
  |             typedef typename covovoc_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (c0 o0 v0) o1 (v1 o2 c1) 
  |                const details::cov_base_node<Type>* cov = static_cast<details::cov_base_node<Type>*>(branch[0]); 
  |                const details::voc_base_node<Type>* voc = static_cast<details::voc_base_node<Type>*>(branch[1]); 
  |                const Type  c0 = cov->c(); 
  |                const Type& v0 = cov->v(); 
  |                const Type  c1 = voc->c(); 
  |                const Type& v1 = voc->v(); 
  |                const details::operator_type o0 = cov->operation(); 
  |                const details::operator_type o1 = operation; 
  |                const details::operator_type o2 = voc->operation(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // (c0 + v0) + (v1 + c1) --> (covov) (c0 + c1) + v0 + v1 
  |                   if ((details::e_add == o0) && (details::e_add == o1) && (details::e_add == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t+t)+t", (c0 + c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(c0 + v0) + (v1 + c1) --> (covov) (c0 + c1) + v0 + v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c0 + v0) - (v1 + c1) --> (covov) (c0 - c1) + v0 - v1 
  |                   else if ((details::e_add == o0) && (details::e_sub == o1) && (details::e_add == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t+t)-t", (c0 - c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(c0 + v0) - (v1 + c1) --> (covov) (c0 - c1) + v0 - v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c0 - v0) - (v1 - c1) --> (covov) (c0 + c1) - v0 - v1 
  |                   else if ((details::e_sub == o0) && (details::e_sub == o1) && (details::e_sub == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "t-(t+t)", (c0 + c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(c0 - v0) - (v1 - c1) --> (covov) (c0 + c1) - v0 - v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c0 * v0) * (v1 * c1) --> (covov) (c0 * c1) * v0 * v1 
  |                   else if ((details::e_mul == o0) && (details::e_mul == o1) && (details::e_mul == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t*t)*t", (c0 * c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(c0 * v0) * (v1 * c1) --> (covov) (c0 * c1) * v0 * v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c0 * v0) / (v1 * c1) --> (covov) (c0 / c1) * (v0 / v1) 
  |                   else if ((details::e_mul == o0) && (details::e_div == o1) && (details::e_mul == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t*t)/t", (c0 / c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(c0 * v0) / (v1 * c1) --> (covov) (c0 / c1) * (v0 / v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c0 / v0) * (v1 / c1) --> (covov) (c0 / c1) * (v1 / v0) 
  |                   else if ((details::e_div == o0) && (details::e_mul == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "t*(t/t)", (c0 / c1), v1, v0, result); 
  |  
  |                      exprtk_debug(("(c0 / v0) * (v1 / c1) --> (covov) (c0 / c1) * (v1 / v0)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c0 / v0) / (v1 / c1) --> (covov) (c0 * c1) / (v0 * v1) 
  |                   else if ((details::e_div == o0) && (details::e_div == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "t/(t*t)", (c0 * c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(c0 / v0) / (v1 / c1) --> (covov) (c0 * c1) / (v0 * v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c0 * v0) / (v1 / c1) --> (covov) (c0 * c1) * (v0 / v1) 
  |                   else if ((details::e_mul == o0) && (details::e_div == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t*t)/t", (c0 * c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(c0 * v0) / (v1 / c1) --> (covov) (c0 * c1) * (v0 / v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c0 / v0) / (v1 * c1) --> (covov) (c0 / c1) / (v0 * v1) 
  |                   else if ((details::e_div == o0) && (details::e_div == o1) && (details::e_mul == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "t/(t*t)", (c0 / c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(c0 / v0) / (v1 * c1) --> (covov) (c0 / c1) / (v0 * v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (c * v0) +/- (v1 * c) --> (covov) c * (v0 +/- v1) 
  |                   else if ( 
  |                             (std::equal_to<T>()(c0,c1)) && 
  |                             (details::e_mul == o0)      && 
  |                             (details::e_mul == o2)      && 
  |                             ( 
  |                               (details::e_add == o1) || 
  |                               (details::e_sub == o1) 
  |                             ) 
  |                           ) 
  |                   { 
  |                      std::string specfunc; 
  |  
  |                      switch (o1) 
  |                      { 
  |                         case details::e_add : specfunc = "t*(t+t)" break; 
  |                         case details::e_sub : specfunc = "t*(t-t)" break; 
  |                         default             : return error_node(); 
  |                      } 
  |  
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, specfunc, c0, v0, v1, result); 
  |  
  |                      exprtk_debug(("(c * v0) +/- (v1 * c) --> (covov) c * (v0 +/- v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), c0, v0, v1, c1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), c0, v0, v1, c1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "t)" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vococov_expression0 
  |          { 
  |             typedef typename vococov_t::type0 node_type; 
  |             typedef typename vococov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (v0 o0 c0) o1 (c1 o2 v1) 
  |                const details::voc_base_node<Type>* voc = static_cast<details::voc_base_node<Type>*>(branch[0]); 
  |                const details::cov_base_node<Type>* cov = static_cast<details::cov_base_node<Type>*>(branch[1]); 
  |                const Type  c0 = voc->c(); 
  |                const Type& v0 = voc->v(); 
  |                const Type  c1 = cov->c(); 
  |                const Type& v1 = cov->v(); 
  |                const details::operator_type o0 = voc->operation(); 
  |                const details::operator_type o1 = operation; 
  |                const details::operator_type o2 = cov->operation(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (expr_gen.parser_->settings_.strength_reduction_enabled()) 
  |                { 
  |                   // (v0 + c0) + (c1 + v1) --> (covov) (c0 + c1) + v0 + v1 
  |                   if ((details::e_add == o0) && (details::e_add == o1) && (details::e_add == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t+t)+t", (c0 + c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 + c0) + (c1 + v1) --> (covov) (c0 + c1) + v0 + v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 + c0) - (c1 + v1) --> (covov) (c0 - c1) + v0 - v1 
  |                   else if ((details::e_add == o0) && (details::e_sub == o1) && (details::e_add == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t+t)-t", (c0 - c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 + c0) - (c1 + v1) --> (covov) (c0 - c1) + v0 - v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 - c0) - (c1 - v1) --> (vovoc) v0 + v1 - (c1 + c0) 
  |                   else if ((details::e_sub == o0) && (details::e_sub == o1) && (details::e_sub == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<vtype, vtype, ctype>(expr_gen, "(t+t)-t", v0, v1, (c1 + c0), result); 
  |  
  |                      exprtk_debug(("(v0 - c0) - (c1 - v1) --> (vovoc) v0 + v1 - (c1 + c0)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 * c0) * (c1 * v1) --> (covov) (c0 * c1) * v0 * v1 
  |                   else if ((details::e_mul == o0) && (details::e_mul == o1) && (details::e_mul == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t*t)*t", (c0 * c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 * c0) * (c1 * v1) --> (covov) (c0 * c1) * v0 * v1\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 * c0) / (c1 * v1) --> (covov) (c0 / c1) * (v0 * v1) 
  |                   else if ((details::e_mul == o0) && (details::e_div == o1) && (details::e_mul == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t*t)/t", (c0 / c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 * c0) / (c1 * v1) --> (covov) (c0 / c1) * (v0 * v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 / c0) * (c1 / v1) --> (covov) (c1 / c0) * (v0 / v1) 
  |                   else if ((details::e_div == o0) && (details::e_mul == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t*t)/t", (c1 / c0), v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 / c0) * (c1 / v1) --> (covov) (c1 / c0) * (v0 / v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 * c0) / (c1 / v1) --> (covov) (c0 / c1) * (v0 * v1) 
  |                   else if ((details::e_mul == o0) && (details::e_div == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t*t)*t", (c0 / c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 * c0) / (c1 / v1) --> (covov) (c0 / c1) * (v0 * v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 / c0) / (c1 * v1) --> (covov) (1 / (c0 * c1)) * (v0 / v1) 
  |                   else if ((details::e_div == o0) && (details::e_div == o1) && (details::e_mul == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, "(t*t)/t", Type(1) / (c0 * c1), v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 / c0) / (c1 * v1) --> (covov) (1 / (c0 * c1)) * (v0 / v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 / c0) / (c1 / v1) --> (vovoc) (v0 * v1) * (1 / (c0 * c1)) 
  |                   else if ((details::e_div == o0) && (details::e_div == o1) && (details::e_div == o2)) 
  |                   { 
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<vtype, vtype, ctype>(expr_gen, "(t*t)*t", v0, v1, Type(1) / (c0 * c1), result); 
  |  
  |                      exprtk_debug(("(v0 / c0) / (c1 / v1) --> (vovoc) (v0 * v1) * (1 / (c0 * c1))\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                   // (v0 * c) +/- (c * v1) --> (covov) c * (v0 +/- v1) 
  |                   else if ( 
  |                             (std::equal_to<T>()(c0,c1)) && 
  |                             (details::e_mul == o0)      && 
  |                             (details::e_mul == o2)      && 
  |                             ( 
  |                               (details::e_add == o1) || (details::e_sub == o1) 
  |                             ) 
  |                           ) 
  |                   { 
  |                      std::string specfunc; 
  |  
  |                      switch (o1) 
  |                      { 
  |                         case details::e_add : specfunc = "t*(t+t)" break; 
  |                         case details::e_sub : specfunc = "t*(t-t)" break; 
  |                         default             : return error_node(); 
  |                      } 
  |  
  |                      const bool synthesis_result = 
  |                         synthesize_sf3ext_expression:: 
  |                            template compile<ctype, vtype, vtype>(expr_gen, specfunc, c0, v0, v1, result); 
  |  
  |                      exprtk_debug(("(v0 * c) +/- (c * v1) --> (covov) c * (v0 +/- v1)\n")); 
  |  
  |                      return (synthesis_result) ? result : error_node(); 
  |                   } 
  |                } 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, c0, c1, v1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o1,f1)) 
  |                   return error_node(); 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |                else 
  |                   return node_type::allocate(*(expr_gen.node_allocator_), v0, c0, c1, v1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "t)" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovovov_expression1 
  |          { 
  |             typedef typename vovovov_t::type1 node_type; 
  |             typedef typename vovovov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // v0 o0 (v1 o1 (v2 o2 v3)) 
  |                typedef typename synthesize_vovov_expression1::node_type lcl_vovov_t; 
  |  
  |                const lcl_vovov_t* vovov = static_cast<const lcl_vovov_t*>(branch[1]); 
  |                const Type& v0 = static_cast<details::variable_node<Type>*>(branch[0])->ref(); 
  |                const Type& v1 = vovov->t0(); 
  |                const Type& v2 = vovov->t1(); 
  |                const Type& v3 = vovov->t2(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = expr_gen.get_operator(vovov->f0()); 
  |                const details::operator_type o2 = expr_gen.get_operator(vovov->f1()); 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = vovov->f0(); 
  |                binary_functor_t f2 = vovov->f1(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen,id(expr_gen, o0, o1, o2), v0, v1, v2, v3, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("v0 o0 (v1 o1 (v2 o2 v3))\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, v2, v3, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "t"  << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t))" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovovoc_expression1 
  |          { 
  |             typedef typename vovovoc_t::type1 node_type; 
  |             typedef typename vovovoc_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // v0 o0 (v1 o1 (v2 o2 c)) 
  |                typedef typename synthesize_vovoc_expression1::node_type lcl_vovoc_t; 
  |  
  |                const lcl_vovoc_t* vovoc = static_cast<const lcl_vovoc_t*>(branch[1]); 
  |                const Type& v0 = static_cast<details::variable_node<Type>*>(branch[0])->ref(); 
  |                const Type& v1 = vovoc->t0(); 
  |                const Type& v2 = vovoc->t1(); 
  |                const Type   c = vovoc->t2(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = expr_gen.get_operator(vovoc->f0()); 
  |                const details::operator_type o2 = expr_gen.get_operator(vovoc->f1()); 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = vovoc->f0(); 
  |                binary_functor_t f2 = vovoc->f1(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, v1, v2, c, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("v0 o0 (v1 o1 (v2 o2 c))\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, v2, c, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "t"  << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t))" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovocov_expression1 
  |          { 
  |             typedef typename vovocov_t::type1 node_type; 
  |             typedef typename vovocov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // v0 o0 (v1 o1 (c o2 v2)) 
  |                typedef typename synthesize_vocov_expression1::node_type lcl_vocov_t; 
  |  
  |                const lcl_vocov_t* vocov = static_cast<const lcl_vocov_t*>(branch[1]); 
  |                const Type& v0 = static_cast<details::variable_node<Type>*>(branch[0])->ref(); 
  |                const Type& v1 = vocov->t0(); 
  |                const Type   c = vocov->t1(); 
  |                const Type& v2 = vocov->t2(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = expr_gen.get_operator(vocov->f0()); 
  |                const details::operator_type o2 = expr_gen.get_operator(vocov->f1()); 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = vocov->f0(); 
  |                binary_functor_t f2 = vocov->f1(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, v1, c, v2, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("v0 o0 (v1 o1 (c o2 v2))\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, c, v2, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "t"  << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t))" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vocovov_expression1 
  |          { 
  |             typedef typename vocovov_t::type1 node_type; 
  |             typedef typename vocovov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // v0 o0 (c o1 (v1 o2 v2)) 
  |                typedef typename synthesize_covov_expression1::node_type lcl_covov_t; 
  |  
  |                const lcl_covov_t* covov = static_cast<const lcl_covov_t*>(branch[1]); 
  |                const Type& v0 = static_cast<details::variable_node<Type>*>(branch[0])->ref(); 
  |                const Type   c = covov->t0(); 
  |                const Type& v1 = covov->t1(); 
  |                const Type& v2 = covov->t2(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = expr_gen.get_operator(covov->f0()); 
  |                const details::operator_type o2 = expr_gen.get_operator(covov->f1()); 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = covov->f0(); 
  |                binary_functor_t f2 = covov->f1(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, c, v1, v2, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("v0 o0 (c o1 (v1 o2 v2))\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, c, v1, v2, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "t"  << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t))" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covovov_expression1 
  |          { 
  |             typedef typename covovov_t::type1 node_type; 
  |             typedef typename covovov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // c o0 (v0 o1 (v1 o2 v2)) 
  |                typedef typename synthesize_vovov_expression1::node_type lcl_vovov_t; 
  |  
  |                const lcl_vovov_t* vovov = static_cast<const lcl_vovov_t*>(branch[1]); 
  |                const Type   c = static_cast<details::literal_node<Type>*>(branch[0])->value(); 
  |                const Type& v0 = vovov->t0(); 
  |                const Type& v1 = vovov->t1(); 
  |                const Type& v2 = vovov->t2(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = expr_gen.get_operator(vovov->f0()); 
  |                const details::operator_type o2 = expr_gen.get_operator(vovov->f1()); 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = vovov->f0(); 
  |                binary_functor_t f2 = vovov->f1(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), c, v0, v1, v2, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("c o0 (v0 o1 (v1 o2 v2))\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), c, v0, v1, v2, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "t"  << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t))" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covocov_expression1 
  |          { 
  |             typedef typename covocov_t::type1 node_type; 
  |             typedef typename covocov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // c0 o0 (v0 o1 (c1 o2 v1)) 
  |                typedef typename synthesize_vocov_expression1::node_type lcl_vocov_t; 
  |  
  |                const lcl_vocov_t* vocov = static_cast<const lcl_vocov_t*>(branch[1]); 
  |                const Type  c0 = static_cast<details::literal_node<Type>*>(branch[0])->value(); 
  |                const Type& v0 = vocov->t0(); 
  |                const Type  c1 = vocov->t1(); 
  |                const Type& v1 = vocov->t2(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = expr_gen.get_operator(vocov->f0()); 
  |                const details::operator_type o2 = expr_gen.get_operator(vocov->f1()); 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = vocov->f0(); 
  |                binary_functor_t f2 = vocov->f1(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), c0, v0, c1, v1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("c0 o0 (v0 o1 (c1 o2 v1))\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), c0, v0, c1, v1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "t"  << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t))" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vocovoc_expression1 
  |          { 
  |             typedef typename vocovoc_t::type1 node_type; 
  |             typedef typename vocovoc_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // v0 o0 (c0 o1 (v1 o2 c2)) 
  |                typedef typename synthesize_covoc_expression1::node_type lcl_covoc_t; 
  |  
  |                const lcl_covoc_t* covoc = static_cast<const lcl_covoc_t*>(branch[1]); 
  |                const Type& v0 = static_cast<details::variable_node<Type>*>(branch[0])->ref(); 
  |                const Type  c0 = covoc->t0(); 
  |                const Type& v1 = covoc->t1(); 
  |                const Type  c1 = covoc->t2(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = expr_gen.get_operator(covoc->f0()); 
  |                const details::operator_type o2 = expr_gen.get_operator(covoc->f1()); 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = covoc->f0(); 
  |                binary_functor_t f2 = covoc->f1(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, c0, v1, c1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("v0 o0 (c0 o1 (v1 o2 c2))\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, c0, v1, c1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "t"  << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t))" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covovoc_expression1 
  |          { 
  |             typedef typename covovoc_t::type1 node_type; 
  |             typedef typename covovoc_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // c0 o0 (v0 o1 (v1 o2 c1)) 
  |                typedef typename synthesize_vovoc_expression1::node_type lcl_vovoc_t; 
  |  
  |                const lcl_vovoc_t* vovoc = static_cast<const lcl_vovoc_t*>(branch[1]); 
  |                const Type  c0 = static_cast<details::literal_node<Type>*>(branch[0])->value(); 
  |                const Type& v0 = vovoc->t0(); 
  |                const Type& v1 = vovoc->t1(); 
  |                const Type  c1 = vovoc->t2(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = expr_gen.get_operator(vovoc->f0()); 
  |                const details::operator_type o2 = expr_gen.get_operator(vovoc->f1()); 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = vovoc->f0(); 
  |                binary_functor_t f2 = vovoc->f1(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), c0, v0, v1, c1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("c0 o0 (v0 o1 (v1 o2 c1))\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), c0, v0, v1, c1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "t"  << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t))" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vococov_expression1 
  |          { 
  |             typedef typename vococov_t::type1 node_type; 
  |             typedef typename vococov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // v0 o0 (c0 o1 (c1 o2 v1)) 
  |                typedef typename synthesize_cocov_expression1::node_type lcl_cocov_t; 
  |  
  |                const lcl_cocov_t* cocov = static_cast<const lcl_cocov_t*>(branch[1]); 
  |                const Type& v0 = static_cast<details::variable_node<Type>*>(branch[0])->ref(); 
  |                const Type  c0 = cocov->t0(); 
  |                const Type  c1 = cocov->t1(); 
  |                const Type& v1 = cocov->t2(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = expr_gen.get_operator(cocov->f0()); 
  |                const details::operator_type o2 = expr_gen.get_operator(cocov->f1()); 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = cocov->f0(); 
  |                binary_functor_t f2 = cocov->f1(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, c0, c1, v1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("v0 o0 (c0 o1 (c1 o2 v1))\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, c0, c1, v1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "t"  << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "(t" << expr_gen.to_str(o2) 
  |                   << "t))" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovovov_expression2 
  |          { 
  |             typedef typename vovovov_t::type2 node_type; 
  |             typedef typename vovovov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // v0 o0 ((v1 o1 v2) o2 v3) 
  |                typedef typename synthesize_vovov_expression0::node_type lcl_vovov_t; 
  |  
  |                const lcl_vovov_t* vovov = static_cast<const lcl_vovov_t*>(branch[1]); 
  |                const Type& v0 = static_cast<details::variable_node<Type>*>(branch[0])->ref(); 
  |                const Type& v1 = vovov->t0(); 
  |                const Type& v2 = vovov->t1(); 
  |                const Type& v3 = vovov->t2(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = expr_gen.get_operator(vovov->f0()); 
  |                const details::operator_type o2 = expr_gen.get_operator(vovov->f1()); 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = vovov->f0(); 
  |                binary_functor_t f2 = vovov->f1(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, v1, v2, v3, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("v0 o0 ((v1 o1 v2) o2 v3)\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, v2, v3, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "t"   << expr_gen.to_str(o0) 
  |                   << "((t" << expr_gen.to_str(o1) 
  |                   << "t)"  << expr_gen.to_str(o2) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovovoc_expression2 
  |          { 
  |             typedef typename vovovoc_t::type2 node_type; 
  |             typedef typename vovovoc_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // v0 o0 ((v1 o1 v2) o2 c) 
  |                typedef typename synthesize_vovoc_expression0::node_type lcl_vovoc_t; 
  |  
  |                const lcl_vovoc_t* vovoc = static_cast<const lcl_vovoc_t*>(branch[1]); 
  |                const Type& v0 = static_cast<details::variable_node<Type>*>(branch[0])->ref(); 
  |                const Type& v1 = vovoc->t0(); 
  |                const Type& v2 = vovoc->t1(); 
  |                const Type   c = vovoc->t2(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = expr_gen.get_operator(vovoc->f0()); 
  |                const details::operator_type o2 = expr_gen.get_operator(vovoc->f1()); 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = vovoc->f0(); 
  |                binary_functor_t f2 = vovoc->f1(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, v1, v2, c, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("v0 o0 ((v1 o1 v2) o2 c)\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, v2, c, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "t"   << expr_gen.to_str(o0) 
  |                   << "((t" << expr_gen.to_str(o1) 
  |                   << "t)"  << expr_gen.to_str(o2) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovocov_expression2 
  |          { 
  |             typedef typename vovocov_t::type2 node_type; 
  |             typedef typename vovocov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // v0 o0 ((v1 o1 c) o2 v2) 
  |                typedef typename synthesize_vocov_expression0::node_type lcl_vocov_t; 
  |  
  |                const lcl_vocov_t* vocov = static_cast<const lcl_vocov_t*>(branch[1]); 
  |                const Type& v0 = static_cast<details::variable_node<Type>*>(branch[0])->ref(); 
  |                const Type& v1 = vocov->t0(); 
  |                const Type   c = vocov->t1(); 
  |                const Type& v2 = vocov->t2(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = expr_gen.get_operator(vocov->f0()); 
  |                const details::operator_type o2 = expr_gen.get_operator(vocov->f1()); 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = vocov->f0(); 
  |                binary_functor_t f2 = vocov->f1(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, v1, c, v2, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("v0 o0 ((v1 o1 c) o2 v2)\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, c, v2, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "t"   << expr_gen.to_str(o0) 
  |                   << "((t" << expr_gen.to_str(o1) 
  |                   << "t)"  << expr_gen.to_str(o2) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vocovov_expression2 
  |          { 
  |             typedef typename vocovov_t::type2 node_type; 
  |             typedef typename vocovov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // v0 o0 ((c o1 v1) o2 v2) 
  |                typedef typename synthesize_covov_expression0::node_type lcl_covov_t; 
  |  
  |                const lcl_covov_t* covov = static_cast<const lcl_covov_t*>(branch[1]); 
  |                const Type& v0 = static_cast<details::variable_node<Type>*>(branch[0])->ref(); 
  |                const Type   c = covov->t0(); 
  |                const Type& v1 = covov->t1(); 
  |                const Type& v2 = covov->t2(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = expr_gen.get_operator(covov->f0()); 
  |                const details::operator_type o2 = expr_gen.get_operator(covov->f1()); 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = covov->f0(); 
  |                binary_functor_t f2 = covov->f1(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, c, v1, v2, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("v0 o0 ((c o1 v1) o2 v2)\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, c, v1, v2, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "t"   << expr_gen.to_str(o0) 
  |                   << "((t" << expr_gen.to_str(o1) 
  |                   << "t)"  << expr_gen.to_str(o2) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covovov_expression2 
  |          { 
  |             typedef typename covovov_t::type2 node_type; 
  |             typedef typename covovov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // c o0 ((v1 o1 v2) o2 v3) 
  |                typedef typename synthesize_vovov_expression0::node_type lcl_vovov_t; 
  |  
  |                const lcl_vovov_t* vovov = static_cast<const lcl_vovov_t*>(branch[1]); 
  |                const Type   c = static_cast<details::literal_node<Type>*>(branch[0])->value(); 
  |                const Type& v0 = vovov->t0(); 
  |                const Type& v1 = vovov->t1(); 
  |                const Type& v2 = vovov->t2(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = expr_gen.get_operator(vovov->f0()); 
  |                const details::operator_type o2 = expr_gen.get_operator(vovov->f1()); 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = vovov->f0(); 
  |                binary_functor_t f2 = vovov->f1(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), c, v0, v1, v2, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("c o0 ((v1 o1 v2) o2 v3)\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), c, v0, v1, v2, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "t"   << expr_gen.to_str(o0) 
  |                   << "((t" << expr_gen.to_str(o1) 
  |                   << "t)"  << expr_gen.to_str(o2) 
  |                   << "t)" 
  |             } 
  |         }; 
  |  
  |          struct synthesize_covocov_expression2 
  |          { 
  |             typedef typename covocov_t::type2 node_type; 
  |             typedef typename covocov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // c0 o0 ((v0 o1 c1) o2 v1) 
  |                typedef typename synthesize_vocov_expression0::node_type lcl_vocov_t; 
  |  
  |                const lcl_vocov_t* vocov = static_cast<const lcl_vocov_t*>(branch[1]); 
  |                const Type  c0 = static_cast<details::literal_node<Type>*>(branch[0])->value(); 
  |                const Type& v0 = vocov->t0(); 
  |                const Type  c1 = vocov->t1(); 
  |                const Type& v1 = vocov->t2(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = expr_gen.get_operator(vocov->f0()); 
  |                const details::operator_type o2 = expr_gen.get_operator(vocov->f1()); 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = vocov->f0(); 
  |                binary_functor_t f2 = vocov->f1(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), c0, v0, c1, v1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("c0 o0 ((v0 o1 c1) o2 v1)\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), c0, v0, c1, v1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "t"   << expr_gen.to_str(o0) 
  |                   << "((t" << expr_gen.to_str(o1) 
  |                   << "t)"  << expr_gen.to_str(o2) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vocovoc_expression2 
  |          { 
  |             typedef typename vocovoc_t::type2 node_type; 
  |             typedef typename vocovoc_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // v0 o0 ((c0 o1 v1) o2 c1) 
  |                typedef typename synthesize_covoc_expression0::node_type lcl_covoc_t; 
  |  
  |                const lcl_covoc_t* covoc = static_cast<const lcl_covoc_t*>(branch[1]); 
  |                const Type& v0 = static_cast<details::variable_node<Type>*>(branch[0])->ref(); 
  |                const Type  c0 = covoc->t0(); 
  |                const Type& v1 = covoc->t1(); 
  |                const Type  c1 = covoc->t2(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = expr_gen.get_operator(covoc->f0()); 
  |                const details::operator_type o2 = expr_gen.get_operator(covoc->f1()); 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = covoc->f0(); 
  |                binary_functor_t f2 = covoc->f1(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, c0, v1, c1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("v0 o0 ((c0 o1 v1) o2 c1)\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, c0, v1, c1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "t"   << expr_gen.to_str(o0) 
  |                   << "((t" << expr_gen.to_str(o1) 
  |                   << "t)"  << expr_gen.to_str(o2) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covovoc_expression2 
  |          { 
  |             typedef typename covovoc_t::type2 node_type; 
  |             typedef typename covovoc_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // c0 o0 ((v0 o1 v1) o2 c1) 
  |                typedef typename synthesize_vovoc_expression0::node_type lcl_vovoc_t; 
  |  
  |                const lcl_vovoc_t* vovoc = static_cast<const lcl_vovoc_t*>(branch[1]); 
  |                const Type  c0 = static_cast<details::literal_node<Type>*>(branch[0])->value(); 
  |                const Type& v0 = vovoc->t0(); 
  |                const Type& v1 = vovoc->t1(); 
  |                const Type  c1 = vovoc->t2(); 
  |                const details::operator_type o0 = operation; 
  |                const details::operator_type o1 = expr_gen.get_operator(vovoc->f0()); 
  |                const details::operator_type o2 = expr_gen.get_operator(vovoc->f1()); 
  |  
  |                binary_functor_t f0 = reinterpret_cast<binary_functor_t>(0); 
  |                binary_functor_t f1 = vovoc->f0(); 
  |                binary_functor_t f2 = vovoc->f1(); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), c0, v0, v1, c1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o0,f0)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("c0 o0 ((v0 o1 v1) o2 c1)\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), c0, v0, v1, c1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "t"   << expr_gen.to_str(o0) 
  |                   << "((t" << expr_gen.to_str(o1) 
  |                   << "t)"  << expr_gen.to_str(o2) 
  |                   << "t)" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vococov_expression2 
  |          { 
  |             typedef typename vococov_t::type2 node_type; 
  |             static inline expression_node_ptr process(expression_generator<Type>&, 
  |                                                       const details::operator_type&, 
  |                                                       expression_node_ptr (&)[2]) 
  |             { 
  |                // v0 o0 ((c0 o1 c1) o2 v1) - Not possible 
  |                exprtk_debug(("v0 o0 ((c0 o1 c1) o2 v1) - Not possible\n")); 
  |                return error_node(); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>&, 
  |                                          const details::operator_type, 
  |                                          const details::operator_type, 
  |                                          const details::operator_type) 
  |             { 
  |                return "INVALID" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovovov_expression3 
  |          { 
  |             typedef typename vovovov_t::type3 node_type; 
  |             typedef typename vovovov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // ((v0 o0 v1) o1 v2) o2 v3 
  |                typedef typename synthesize_vovov_expression0::node_type lcl_vovov_t; 
  |  
  |                const lcl_vovov_t* vovov = static_cast<const lcl_vovov_t*>(branch[0]); 
  |                const Type& v0 = vovov->t0(); 
  |                const Type& v1 = vovov->t1(); 
  |                const Type& v2 = vovov->t2(); 
  |                const Type& v3 = static_cast<details::variable_node<Type>*>(branch[1])->ref(); 
  |                const details::operator_type o0 = expr_gen.get_operator(vovov->f0()); 
  |                const details::operator_type o1 = expr_gen.get_operator(vovov->f1()); 
  |                const details::operator_type o2 = operation; 
  |  
  |                binary_functor_t f0 = vovov->f0(); 
  |                binary_functor_t f1 = vovov->f1(); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, v1, v2, v3, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("((v0 o0 v1) o1 v2) o2 v3\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, v2, v3, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "((t" << expr_gen.to_str(o0) 
  |                   << "t)"  << expr_gen.to_str(o1) 
  |                   << "t)"  << expr_gen.to_str(o2) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovovoc_expression3 
  |          { 
  |             typedef typename vovovoc_t::type3 node_type; 
  |             typedef typename vovovoc_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // ((v0 o0 v1) o1 v2) o2 c 
  |                typedef typename synthesize_vovov_expression0::node_type lcl_vovov_t; 
  |  
  |                const lcl_vovov_t* vovov = static_cast<const lcl_vovov_t*>(branch[0]); 
  |                const Type& v0 = vovov->t0(); 
  |                const Type& v1 = vovov->t1(); 
  |                const Type& v2 = vovov->t2(); 
  |                const Type   c = static_cast<details::literal_node<Type>*>(branch[1])->value(); 
  |                const details::operator_type o0 = expr_gen.get_operator(vovov->f0()); 
  |                const details::operator_type o1 = expr_gen.get_operator(vovov->f1()); 
  |                const details::operator_type o2 = operation; 
  |  
  |                binary_functor_t f0 = vovov->f0(); 
  |                binary_functor_t f1 = vovov->f1(); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, v1, v2, c, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("((v0 o0 v1) o1 v2) o2 c\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, v2, c, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "((t" << expr_gen.to_str(o0) 
  |                   << "t)"  << expr_gen.to_str(o1) 
  |                   << "t)"  << expr_gen.to_str(o2) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovocov_expression3 
  |          { 
  |             typedef typename vovocov_t::type3 node_type; 
  |             typedef typename vovocov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // ((v0 o0 v1) o1 c) o2 v2 
  |                typedef typename synthesize_vovoc_expression0::node_type lcl_vovoc_t; 
  |  
  |                const lcl_vovoc_t* vovoc = static_cast<const lcl_vovoc_t*>(branch[0]); 
  |                const Type& v0 = vovoc->t0(); 
  |                const Type& v1 = vovoc->t1(); 
  |                const Type   c = vovoc->t2(); 
  |                const Type& v2 = static_cast<details::variable_node<Type>*>(branch[1])->ref(); 
  |                const details::operator_type o0 = expr_gen.get_operator(vovoc->f0()); 
  |                const details::operator_type o1 = expr_gen.get_operator(vovoc->f1()); 
  |                const details::operator_type o2 = operation; 
  |  
  |                binary_functor_t f0 = vovoc->f0(); 
  |                binary_functor_t f1 = vovoc->f1(); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, v1, c, v2, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("((v0 o0 v1) o1 c) o2 v2\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, c, v2, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "((t" << expr_gen.to_str(o0) 
  |                   << "t)"  << expr_gen.to_str(o1) 
  |                   << "t)"  << expr_gen.to_str(o2) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vocovov_expression3 
  |          { 
  |             typedef typename vocovov_t::type3 node_type; 
  |             typedef typename vocovov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // ((v0 o0 c) o1 v1) o2 v2 
  |                typedef typename synthesize_vocov_expression0::node_type lcl_vocov_t; 
  |  
  |                const lcl_vocov_t* vocov = static_cast<const lcl_vocov_t*>(branch[0]); 
  |                const Type& v0 = vocov->t0(); 
  |                const Type   c = vocov->t1(); 
  |                const Type& v1 = vocov->t2(); 
  |                const Type& v2 = static_cast<details::variable_node<Type>*>(branch[1])->ref(); 
  |                const details::operator_type o0 = expr_gen.get_operator(vocov->f0()); 
  |                const details::operator_type o1 = expr_gen.get_operator(vocov->f1()); 
  |                const details::operator_type o2 = operation; 
  |  
  |                binary_functor_t f0 = vocov->f0(); 
  |                binary_functor_t f1 = vocov->f1(); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, c, v1, v2, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("((v0 o0 c) o1 v1) o2 v2\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, c, v1, v2, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "((t" << expr_gen.to_str(o0) 
  |                   << "t)"  << expr_gen.to_str(o1) 
  |                   << "t)"  << expr_gen.to_str(o2) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covovov_expression3 
  |          { 
  |             typedef typename covovov_t::type3 node_type; 
  |             typedef typename covovov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // ((c o0 v0) o1 v1) o2 v2 
  |                typedef typename synthesize_covov_expression0::node_type lcl_covov_t; 
  |  
  |                const lcl_covov_t* covov = static_cast<const lcl_covov_t*>(branch[0]); 
  |                const Type   c = covov->t0(); 
  |                const Type& v0 = covov->t1(); 
  |                const Type& v1 = covov->t2(); 
  |                const Type& v2 = static_cast<details::variable_node<Type>*>(branch[1])->ref(); 
  |                const details::operator_type o0 = expr_gen.get_operator(covov->f0()); 
  |                const details::operator_type o1 = expr_gen.get_operator(covov->f1()); 
  |                const details::operator_type o2 = operation; 
  |  
  |                binary_functor_t f0 = covov->f0(); 
  |                binary_functor_t f1 = covov->f1(); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), c, v0, v1, v2, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("((c o0 v0) o1 v1) o2 v2\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), c, v0, v1, v2, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "((t" << expr_gen.to_str(o0) 
  |                   << "t)"  << expr_gen.to_str(o1) 
  |                   << "t)"  << expr_gen.to_str(o2) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covocov_expression3 
  |          { 
  |             typedef typename covocov_t::type3 node_type; 
  |             typedef typename covocov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // ((c0 o0 v0) o1 c1) o2 v1 
  |                typedef typename synthesize_covoc_expression0::node_type lcl_covoc_t; 
  |  
  |                const lcl_covoc_t* covoc = static_cast<const lcl_covoc_t*>(branch[0]); 
  |                const Type  c0 = covoc->t0(); 
  |                const Type& v0 = covoc->t1(); 
  |                const Type  c1 = covoc->t2(); 
  |                const Type& v1 = static_cast<details::variable_node<Type>*>(branch[1])->ref(); 
  |                const details::operator_type o0 = expr_gen.get_operator(covoc->f0()); 
  |                const details::operator_type o1 = expr_gen.get_operator(covoc->f1()); 
  |                const details::operator_type o2 = operation; 
  |  
  |                binary_functor_t f0 = covoc->f0(); 
  |                binary_functor_t f1 = covoc->f1(); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), c0, v0, c1, v1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("((c0 o0 v0) o1 c1) o2 v1\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), c0, v0, c1, v1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "((t" << expr_gen.to_str(o0) 
  |                   << "t)"  << expr_gen.to_str(o1) 
  |                   << "t)"  << expr_gen.to_str(o2) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vocovoc_expression3 
  |          { 
  |             typedef typename vocovoc_t::type3 node_type; 
  |             typedef typename vocovoc_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // ((v0 o0 c0) o1 v1) o2 c1 
  |                typedef typename synthesize_vocov_expression0::node_type lcl_vocov_t; 
  |  
  |                const lcl_vocov_t* vocov = static_cast<const lcl_vocov_t*>(branch[0]); 
  |                const Type& v0 = vocov->t0(); 
  |                const Type  c0 = vocov->t1(); 
  |                const Type& v1 = vocov->t2(); 
  |                const Type  c1 = static_cast<details::literal_node<Type>*>(branch[1])->value(); 
  |                const details::operator_type o0 = expr_gen.get_operator(vocov->f0()); 
  |                const details::operator_type o1 = expr_gen.get_operator(vocov->f1()); 
  |                const details::operator_type o2 = operation; 
  |  
  |                binary_functor_t f0 = vocov->f0(); 
  |                binary_functor_t f1 = vocov->f1(); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, c0, v1, c1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("((v0 o0 c0) o1 v1) o2 c1\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, c0, v1, c1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "((t" << expr_gen.to_str(o0) 
  |                   << "t)"  << expr_gen.to_str(o1) 
  |                   << "t)"  << expr_gen.to_str(o2) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covovoc_expression3 
  |          { 
  |             typedef typename covovoc_t::type3 node_type; 
  |             typedef typename covovoc_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // ((c0 o0 v0) o1 v1) o2 c1 
  |                typedef typename synthesize_covov_expression0::node_type lcl_covov_t; 
  |  
  |                const lcl_covov_t* covov = static_cast<const lcl_covov_t*>(branch[0]); 
  |                const Type  c0 = covov->t0(); 
  |                const Type& v0 = covov->t1(); 
  |                const Type& v1 = covov->t2(); 
  |                const Type  c1 = static_cast<details::literal_node<Type>*>(branch[1])->value(); 
  |                const details::operator_type o0 = expr_gen.get_operator(covov->f0()); 
  |                const details::operator_type o1 = expr_gen.get_operator(covov->f1()); 
  |                const details::operator_type o2 = operation; 
  |  
  |                binary_functor_t f0 = covov->f0(); 
  |                binary_functor_t f1 = covov->f1(); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), c0, v0, v1, c1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("((c0 o0 v0) o1 v1) o2 c1\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), c0, v0, v1, c1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "((t" << expr_gen.to_str(o0) 
  |                   << "t)"  << expr_gen.to_str(o1) 
  |                   << "t)"  << expr_gen.to_str(o2) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vococov_expression3 
  |          { 
  |             typedef typename vococov_t::type3 node_type; 
  |             typedef typename vococov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // ((v0 o0 c0) o1 c1) o2 v1 
  |                typedef typename synthesize_vococ_expression0::node_type lcl_vococ_t; 
  |  
  |                const lcl_vococ_t* vococ = static_cast<const lcl_vococ_t*>(branch[0]); 
  |                const Type& v0 = vococ->t0(); 
  |                const Type  c0 = vococ->t1(); 
  |                const Type  c1 = vococ->t2(); 
  |                const Type& v1 = static_cast<details::variable_node<Type>*>(branch[1])->ref(); 
  |                const details::operator_type o0 = expr_gen.get_operator(vococ->f0()); 
  |                const details::operator_type o1 = expr_gen.get_operator(vococ->f1()); 
  |                const details::operator_type o2 = operation; 
  |  
  |                binary_functor_t f0 = vococ->f0(); 
  |                binary_functor_t f1 = vococ->f1(); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, c0, c1, v1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("((v0 o0 c0) o1 c1) o2 v1\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, c0, c1, v1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "((t" << expr_gen.to_str(o0) 
  |                   << "t)"  << expr_gen.to_str(o1) 
  |                   << "t)"  << expr_gen.to_str(o2) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovovov_expression4 
  |          { 
  |             typedef typename vovovov_t::type4 node_type; 
  |             typedef typename vovovov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // (v0 o0 (v1 o1 v2)) o2 v3 
  |                typedef typename synthesize_vovov_expression1::node_type lcl_vovov_t; 
  |  
  |                const lcl_vovov_t* vovov = static_cast<const lcl_vovov_t*>(branch[0]); 
  |                const Type& v0 = vovov->t0(); 
  |                const Type& v1 = vovov->t1(); 
  |                const Type& v2 = vovov->t2(); 
  |                const Type& v3 = static_cast<details::variable_node<Type>*>(branch[1])->ref(); 
  |                const details::operator_type o0 = expr_gen.get_operator(vovov->f0()); 
  |                const details::operator_type o1 = expr_gen.get_operator(vovov->f1()); 
  |                const details::operator_type o2 = operation; 
  |  
  |                binary_functor_t f0 = vovov->f0(); 
  |                binary_functor_t f1 = vovov->f1(); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, v1, v2, v3, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("(v0 o0 (v1 o1 v2)) o2 v3\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, v2, v3, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "t)" << expr_gen.to_str(o2) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovovoc_expression4 
  |          { 
  |             typedef typename vovovoc_t::type4 node_type; 
  |             typedef typename vovovoc_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // ((v0 o0 (v1 o1 v2)) o2 c) 
  |                typedef typename synthesize_vovov_expression1::node_type lcl_vovov_t; 
  |  
  |                const lcl_vovov_t* vovov = static_cast<const lcl_vovov_t*>(branch[0]); 
  |                const Type& v0 = vovov->t0(); 
  |                const Type& v1 = vovov->t1(); 
  |                const Type& v2 = vovov->t2(); 
  |                const Type   c = static_cast<details::literal_node<Type>*>(branch[1])->value(); 
  |                const details::operator_type o0 = expr_gen.get_operator(vovov->f0()); 
  |                const details::operator_type o1 = expr_gen.get_operator(vovov->f1()); 
  |                const details::operator_type o2 = operation; 
  |  
  |                binary_functor_t f0 = vovov->f0(); 
  |                binary_functor_t f1 = vovov->f1(); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, v1, v2, c, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("((v0 o0 (v1 o1 v2)) o2 c)\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, v2, c, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "t)" << expr_gen.to_str(o2) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vovocov_expression4 
  |          { 
  |             typedef typename vovocov_t::type4 node_type; 
  |             typedef typename vovocov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // ((v0 o0 (v1 o1 c)) o2 v1) 
  |                typedef typename synthesize_vovoc_expression1::node_type lcl_vovoc_t; 
  |  
  |                const lcl_vovoc_t* vovoc = static_cast<const lcl_vovoc_t*>(branch[0]); 
  |                const Type& v0 = vovoc->t0(); 
  |                const Type& v1 = vovoc->t1(); 
  |                const Type   c = vovoc->t2(); 
  |                const Type& v2 = static_cast<details::variable_node<Type>*>(branch[1])->ref(); 
  |                const details::operator_type o0 = expr_gen.get_operator(vovoc->f0()); 
  |                const details::operator_type o1 = expr_gen.get_operator(vovoc->f1()); 
  |                const details::operator_type o2 = operation; 
  |  
  |                binary_functor_t f0 = vovoc->f0(); 
  |                binary_functor_t f1 = vovoc->f1(); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, v1, c, v2, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("((v0 o0 (v1 o1 c)) o2 v1)\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, v1, c, v2, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "t)" << expr_gen.to_str(o2) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vocovov_expression4 
  |          { 
  |             typedef typename vocovov_t::type4 node_type; 
  |             typedef typename vocovov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // ((v0 o0 (c o1 v1)) o2 v2) 
  |                typedef typename synthesize_vocov_expression1::node_type lcl_vocov_t; 
  |  
  |                const lcl_vocov_t* vocov = static_cast<const lcl_vocov_t*>(branch[0]); 
  |                const Type& v0 = vocov->t0(); 
  |                const Type   c = vocov->t1(); 
  |                const Type& v1 = vocov->t2(); 
  |                const Type& v2 = static_cast<details::variable_node<Type>*>(branch[1])->ref(); 
  |                const details::operator_type o0 = expr_gen.get_operator(vocov->f0()); 
  |                const details::operator_type o1 = expr_gen.get_operator(vocov->f1()); 
  |                const details::operator_type o2 = operation; 
  |  
  |                binary_functor_t f0 = vocov->f0(); 
  |                binary_functor_t f1 = vocov->f1(); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, c, v1, v2, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("((v0 o0 (c o1 v1)) o2 v2)\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, c, v1, v2, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "t)" << expr_gen.to_str(o2) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covovov_expression4 
  |          { 
  |             typedef typename covovov_t::type4 node_type; 
  |             typedef typename covovov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // ((c o0 (v0 o1 v1)) o2 v2) 
  |                typedef typename synthesize_covov_expression1::node_type lcl_covov_t; 
  |  
  |                const lcl_covov_t* covov = static_cast<const lcl_covov_t*>(branch[0]); 
  |                const Type   c = covov->t0(); 
  |                const Type& v0 = covov->t1(); 
  |                const Type& v1 = covov->t2(); 
  |                const Type& v2 = static_cast<details::variable_node<Type>*>(branch[1])->ref(); 
  |                const details::operator_type o0 = expr_gen.get_operator(covov->f0()); 
  |                const details::operator_type o1 = expr_gen.get_operator(covov->f1()); 
  |                const details::operator_type o2 = operation; 
  |  
  |                binary_functor_t f0 = covov->f0(); 
  |                binary_functor_t f1 = covov->f1(); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), c, v0, v1, v2, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("((c o0 (v0 o1 v1)) o2 v2)\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), c, v0, v1, v2, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "t)" << expr_gen.to_str(o2) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covocov_expression4 
  |          { 
  |             typedef typename covocov_t::type4 node_type; 
  |             typedef typename covocov_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // ((c0 o0 (v0 o1 c1)) o2 v1) 
  |                typedef typename synthesize_covoc_expression1::node_type lcl_covoc_t; 
  |  
  |                const lcl_covoc_t* covoc = static_cast<const lcl_covoc_t*>(branch[0]); 
  |                const Type  c0 = covoc->t0(); 
  |                const Type& v0 = covoc->t1(); 
  |                const Type  c1 = covoc->t2(); 
  |                const Type& v1 = static_cast<details::variable_node<Type>*>(branch[1])->ref(); 
  |                const details::operator_type o0 = expr_gen.get_operator(covoc->f0()); 
  |                const details::operator_type o1 = expr_gen.get_operator(covoc->f1()); 
  |                const details::operator_type o2 = operation; 
  |  
  |                binary_functor_t f0 = covoc->f0(); 
  |                binary_functor_t f1 = covoc->f1(); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), c0, v0, c1, v1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("((c0 o0 (v0 o1 c1)) o2 v1)\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), c0, v0, c1, v1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "t)" << expr_gen.to_str(o2) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vocovoc_expression4 
  |          { 
  |             typedef typename vocovoc_t::type4 node_type; 
  |             typedef typename vocovoc_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // ((v0 o0 (c0 o1 v1)) o2 c1) 
  |                typedef typename synthesize_vocov_expression1::node_type lcl_vocov_t; 
  |  
  |                const lcl_vocov_t* vocov = static_cast<const lcl_vocov_t*>(branch[0]); 
  |                const Type& v0 = vocov->t0(); 
  |                const Type  c0 = vocov->t1(); 
  |                const Type& v1 = vocov->t2(); 
  |                const Type  c1 = static_cast<details::literal_node<Type>*>(branch[1])->value(); 
  |                const details::operator_type o0 = expr_gen.get_operator(vocov->f0()); 
  |                const details::operator_type o1 = expr_gen.get_operator(vocov->f1()); 
  |                const details::operator_type o2 = operation; 
  |  
  |                binary_functor_t f0 = vocov->f0(); 
  |                binary_functor_t f1 = vocov->f1(); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), v0, c0, v1, c1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("((v0 o0 (c0 o1 v1)) o2 c1)\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), v0, c0, v1, c1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "t)" << expr_gen.to_str(o2) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_covovoc_expression4 
  |          { 
  |             typedef typename covovoc_t::type4 node_type; 
  |             typedef typename covovoc_t::sf4_type sf4_type; 
  |             typedef typename node_type::T0 T0; 
  |             typedef typename node_type::T1 T1; 
  |             typedef typename node_type::T2 T2; 
  |             typedef typename node_type::T3 T3; 
  |  
  |             static inline expression_node_ptr process(expression_generator<Type>& expr_gen, 
  |                                                       const details::operator_type& operation, 
  |                                                       expression_node_ptr (&branch)[2]) 
  |             { 
  |                // ((c0 o0 (v0 o1 v1)) o2 c1) 
  |                typedef typename synthesize_covov_expression1::node_type lcl_covov_t; 
  |  
  |                const lcl_covov_t* covov = static_cast<const lcl_covov_t*>(branch[0]); 
  |                const Type  c0 = covov->t0(); 
  |                const Type& v0 = covov->t1(); 
  |                const Type& v1 = covov->t2(); 
  |                const Type  c1 = static_cast<details::literal_node<Type>*>(branch[1])->value(); 
  |                const details::operator_type o0 = expr_gen.get_operator(covov->f0()); 
  |                const details::operator_type o1 = expr_gen.get_operator(covov->f1()); 
  |                const details::operator_type o2 = operation; 
  |  
  |                binary_functor_t f0 = covov->f0(); 
  |                binary_functor_t f1 = covov->f1(); 
  |                binary_functor_t f2 = reinterpret_cast<binary_functor_t>(0); 
  |  
  |                details::free_node(*(expr_gen.node_allocator_),branch[0]); 
  |                details::free_node(*(expr_gen.node_allocator_),branch[1]); 
  |  
  |                expression_node_ptr result = error_node(); 
  |  
  |                const bool synthesis_result = 
  |                   synthesize_sf4ext_expression::template compile<T0, T1, T2, T3> 
  |                      (expr_gen, id(expr_gen, o0, o1, o2), c0, v0, v1, c1, result); 
  |  
  |                if (synthesis_result) 
  |                   return result; 
  |                else if (!expr_gen.valid_operator(o2,f2)) 
  |                   return error_node(); 
  |  
  |                exprtk_debug(("((c0 o0 (v0 o1 v1)) o2 c1)\n")); 
  |  
  |                return node_type::allocate(*(expr_gen.node_allocator_), c0, v0, v1, c1, f0, f1, f2); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>& expr_gen, 
  |                                          const details::operator_type o0, 
  |                                          const details::operator_type o1, 
  |                                          const details::operator_type o2) 
  |             { 
  |                return details::build_string() 
  |                   << "(t" << expr_gen.to_str(o0) 
  |                   << "(t" << expr_gen.to_str(o1) 
  |                   << "t)" << expr_gen.to_str(o2) 
  |                   << "t" 
  |             } 
  |          }; 
  |  
  |          struct synthesize_vococov_expression4 
  |          { 
  |             typedef typename vococov_t::type4 node_type; 
  |             static inline expression_node_ptr process(expression_generator<Type>&, 
  |                                                       const details::operator_type&, 
  |                                                       expression_node_ptr (&)[2]) 
  |             { 
  |                // ((v0 o0 (c0 o1 c1)) o2 v1) - Not possible 
  |                exprtk_debug(("((v0 o0 (c0 o1 c1)) o2 v1) - Not possible\n")); 
  |                return error_node(); 
  |             } 
  |  
  |             static inline std::string id(expression_generator<Type>&, 
  |                                          const details::operator_type, 
  |                                          const details::operator_type, 
  |                                          const details::operator_type) 
  |             { 
  |                return "INVALID" 
  |             } 
  |          }; 
  |          #endif 
  |  
  |          inline expression_node_ptr synthesize_uvouv_expression(const details::operator_type& operation, expression_node_ptr (&branch)[2]) 
  |          { 
  |             // Definition: uv o uv 
  |             details::operator_type o0 = static_cast<details::uv_base_node<Type>*>(branch[0])->operation(); 
  |             details::operator_type o1 = static_cast<details::uv_base_node<Type>*>(branch[1])->operation(); 
  |             const Type& v0 = static_cast<details::uv_base_node<Type>*>(branch[0])->v(); 
  |             const Type& v1 = static_cast<details::uv_base_node<Type>*>(branch[1])->v(); 
  |             unary_functor_t u0 = reinterpret_cast<unary_functor_t> (0); 
  |             unary_functor_t u1 = reinterpret_cast<unary_functor_t> (0); 
  |             binary_functor_t f = reinterpret_cast<binary_functor_t>(0); 
  |  
  |             if (!valid_operator(o0,u0)) 
  |                return error_node(); 
  |             else if (!valid_operator(o1,u1)) 
  |                return error_node(); 
  |             else if (!valid_operator(operation,f)) 
  |                return error_node(); 
  |  
  |             expression_node_ptr result = error_node(); 
  |  
  |             if ( 
  |                  (details::e_neg == o0) && 
  |                  (details::e_neg == o1) 
  |                ) 
  |             { 
  |                switch (operation) 
  |                { 
  |                   // (-v0 + -v1) --> -(v0 + v1) 
  |                   case details::e_add : result = (*this)(details::e_neg, 
  |                                                     node_allocator_-> 
  |                                                        allocate_rr<typename details:: 
  |                                                           vov_node<Type,details::add_op<Type> > >(v0, v1)); 
  |                                         exprtk_debug(("(-v0 + -v1) --> -(v0 + v1)\n")); 
  |                                         break; 
  |  
  |                   // (-v0 - -v1) --> (v1 - v0) 
  |                   case details::e_sub : result = node_allocator_-> 
  |                                                     allocate_rr<typename details:: 
  |                                                        vov_node<Type,details::sub_op<Type> > >(v1, v0); 
  |                                         exprtk_debug(("(-v0 - -v1) --> (v1 - v0)\n")); 
  |                                         break; 
  |  
  |                   // (-v0 * -v1) --> (v0 * v1) 
  |                   case details::e_mul : result = node_allocator_-> 
  |                                                     allocate_rr<typename details:: 
  |                                                        vov_node<Type,details::mul_op<Type> > >(v0, v1); 
  |                                         exprtk_debug(("(-v0 * -v1) --> (v0 * v1)\n")); 
  |                                         break; 
  |  
  |                   // (-v0 / -v1) --> (v0 / v1) 
  |                   case details::e_div : result = node_allocator_-> 
  |                                                     allocate_rr<typename details:: 
  |                                                        vov_node<Type,details::div_op<Type> > >(v0, v1); 
  |                                         exprtk_debug(("(-v0 / -v1) --> (v0 / v1)\n")); 
  |                                         break; 
  |  
  |                   default             : break; 
  |                } 
  |             } 
  |  
  |             if (0 == result) 
  |             { 
  |                result = node_allocator_-> 
  |                             allocate_rrrrr<typename details::uvouv_node<Type> >(v0, v1, u0, u1, f); 
  |             } 
  |  
  |             details::free_all_nodes(*node_allocator_,branch); 
  |             return result; 
  |          } 
  |  
  |          #undef basic_opr_switch_statements 
  |          #undef extended_opr_switch_statements 
  |          #undef unary_opr_switch_statements 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |  
  |          #define string_opr_switch_statements            \ 
  |          case_stmt(details::e_lt    , details::lt_op   ) \ 
  |          case_stmt(details::e_lte   , details::lte_op  ) \ 
  |          case_stmt(details::e_gt    , details::gt_op   ) \ 
  |          case_stmt(details::e_gte   , details::gte_op  ) \ 
  |          case_stmt(details::e_eq    , details::eq_op   ) \ 
  |          case_stmt(details::e_ne    , details::ne_op   ) \ 
  |          case_stmt(details::e_in    , details::in_op   ) \ 
  |          case_stmt(details::e_like  , details::like_op ) \ 
  |          case_stmt(details::e_ilike , details::ilike_op) \ 
  |  
  |          template <typename T0, typename T1> 
  |          inline expression_node_ptr synthesize_str_xrox_expression_impl(const details::operator_type& opr, 
  |                                                                         T0 s0, T1 s1, 
  |                                                                         range_t rp0) 
  |          { 
  |             switch (opr) 
  |             { 
  |                #define case_stmt(op0, op1)                                                                      \ 
  |                case op0 : return node_allocator_->                                                              \ 
  |                              allocate_ttt<typename details::str_xrox_node<Type,T0,T1,range_t,op1<Type> >,T0,T1> \ 
  |                                 (s0, s1, rp0);                                                                  \ 
  |  
  |                string_opr_switch_statements 
  |                #undef case_stmt 
  |                default : return error_node(); 
  |             } 
  |          } 
  |  
  |          template <typename T0, typename T1> 
  |          inline expression_node_ptr synthesize_str_xoxr_expression_impl(const details::operator_type& opr, 
  |                                                                         T0 s0, T1 s1, 
  |                                                                         range_t rp1) 
  |          { 
  |             switch (opr) 
  |             { 
  |                #define case_stmt(op0, op1)                                                                      \ 
  |                case op0 : return node_allocator_->                                                              \ 
  |                              allocate_ttt<typename details::str_xoxr_node<Type,T0,T1,range_t,op1<Type> >,T0,T1> \ 
  |                                 (s0, s1, rp1);                                                                  \ 
  |  
  |                string_opr_switch_statements 
  |                #undef case_stmt 
  |                default : return error_node(); 
  |             } 
  |          } 
  |  
  |          template <typename T0, typename T1> 
  |          inline expression_node_ptr synthesize_str_xroxr_expression_impl(const details::operator_type& opr, 
  |                                                                          T0 s0, T1 s1, 
  |                                                                          range_t rp0, range_t rp1) 
  |          { 
  |             switch (opr) 
  |             { 
  |                #define case_stmt(op0, op1)                                                                        \ 
  |                case op0 : return node_allocator_->                                                                \ 
  |                              allocate_tttt<typename details::str_xroxr_node<Type,T0,T1,range_t,op1<Type> >,T0,T1> \ 
  |                                 (s0, s1, rp0, rp1);                                                               \ 
  |  
  |                string_opr_switch_statements 
  |                #undef case_stmt 
  |                default : return error_node(); 
  |             } 
  |          } 
  |  
  |          template <typename T0, typename T1> 
  |          inline expression_node_ptr synthesize_sos_expression_impl(const details::operator_type& opr, T0 s0, T1 s1) 
  |          { 
  |             switch (opr) 
  |             { 
  |                #define case_stmt(op0, op1)                                                                 \ 
  |                case op0 : return node_allocator_->                                                         \ 
  |                              allocate_tt<typename details::sos_node<Type,T0,T1,op1<Type> >,T0,T1>(s0, s1); \ 
  |  
  |                string_opr_switch_statements 
  |                #undef case_stmt 
  |                default : return error_node(); 
  |             } 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_sos_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             std::string& s0 = static_cast<details::stringvar_node<Type>*>(branch[0])->ref(); 
  |             std::string& s1 = static_cast<details::stringvar_node<Type>*>(branch[1])->ref(); 
  |  
  |             return synthesize_sos_expression_impl<std::string&,std::string&>(opr, s0, s1); 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_sros_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             std::string&  s0 = static_cast<details::string_range_node<Type>*>(branch[0])->ref  (); 
  |             std::string&  s1 = static_cast<details::stringvar_node<Type>*>   (branch[1])->ref  (); 
  |             range_t      rp0 = static_cast<details::string_range_node<Type>*>(branch[0])->range(); 
  |  
  |             static_cast<details::string_range_node<Type>*>(branch[0])->range_ref().clear(); 
  |  
  |             details::free_node(*node_allocator_,branch[0]); 
  |  
  |             return synthesize_str_xrox_expression_impl<std::string&,std::string&>(opr, s0, s1, rp0); 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_sosr_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             std::string&  s0 = static_cast<details::stringvar_node<Type>*>   (branch[0])->ref  (); 
  |             std::string&  s1 = static_cast<details::string_range_node<Type>*>(branch[1])->ref  (); 
  |             range_t      rp1 = static_cast<details::string_range_node<Type>*>(branch[1])->range(); 
  |  
  |             static_cast<details::string_range_node<Type>*>(branch[1])->range_ref().clear(); 
  |  
  |             details::free_node(*node_allocator_,branch[1]); 
  |  
  |             return synthesize_str_xoxr_expression_impl<std::string&,std::string&>(opr, s0, s1, rp1); 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_socsr_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             std::string&  s0 = static_cast<details::stringvar_node<Type>*>         (branch[0])->ref  (); 
  |             std::string   s1 = static_cast<details::const_string_range_node<Type>*>(branch[1])->str  (); 
  |             range_t      rp1 = static_cast<details::const_string_range_node<Type>*>(branch[1])->range(); 
  |  
  |             static_cast<details::const_string_range_node<Type>*>(branch[1])->range_ref().clear(); 
  |  
  |             details::free_node(*node_allocator_,branch[1]); 
  |  
  |             return synthesize_str_xoxr_expression_impl<std::string&, const std::string>(opr, s0, s1, rp1); 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_srosr_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             std::string&  s0 = static_cast<details::string_range_node<Type>*>(branch[0])->ref  (); 
  |             std::string&  s1 = static_cast<details::string_range_node<Type>*>(branch[1])->ref  (); 
  |             range_t      rp0 = static_cast<details::string_range_node<Type>*>(branch[0])->range(); 
  |             range_t      rp1 = static_cast<details::string_range_node<Type>*>(branch[1])->range(); 
  |  
  |             static_cast<details::string_range_node<Type>*>(branch[0])->range_ref().clear(); 
  |             static_cast<details::string_range_node<Type>*>(branch[1])->range_ref().clear(); 
  |  
  |             details::free_node(*node_allocator_,branch[0]); 
  |             details::free_node(*node_allocator_,branch[1]); 
  |  
  |             return synthesize_str_xroxr_expression_impl<std::string&,std::string&>(opr, s0, s1, rp0, rp1); 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_socs_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             std::string& s0 = static_cast<     details::stringvar_node<Type>*>(branch[0])->ref(); 
  |             std::string  s1 = static_cast<details::string_literal_node<Type>*>(branch[1])->str(); 
  |  
  |             details::free_node(*node_allocator_,branch[1]); 
  |  
  |             return synthesize_sos_expression_impl<std::string&, const std::string>(opr, s0, s1); 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_csos_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             std::string  s0 = static_cast<details::string_literal_node<Type>*>(branch[0])->str(); 
  |             std::string& s1 = static_cast<details::stringvar_node<Type>*     >(branch[1])->ref(); 
  |  
  |             details::free_node(*node_allocator_,branch[0]); 
  |  
  |             return synthesize_sos_expression_impl<const std::string,std::string&>(opr, s0, s1); 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_csosr_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             std::string  s0  = static_cast<details::string_literal_node<Type>*>(branch[0])->str  (); 
  |             std::string& s1  = static_cast<details::string_range_node<Type>*  >(branch[1])->ref  (); 
  |             range_t      rp1 = static_cast<details::string_range_node<Type>*  >(branch[1])->range(); 
  |  
  |             static_cast<details::string_range_node<Type>*>(branch[1])->range_ref().clear(); 
  |  
  |             details::free_node(*node_allocator_,branch[0]); 
  |             details::free_node(*node_allocator_,branch[1]); 
  |  
  |             return synthesize_str_xoxr_expression_impl<const std::string,std::string&>(opr, s0, s1, rp1); 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_srocs_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             std::string&  s0 = static_cast<details::string_range_node<Type>*  >(branch[0])->ref  (); 
  |             std::string   s1 = static_cast<details::string_literal_node<Type>*>(branch[1])->str  (); 
  |             range_t      rp0 = static_cast<details::string_range_node<Type>*  >(branch[0])->range(); 
  |  
  |             static_cast<details::string_range_node<Type>*>(branch[0])->range_ref().clear(); 
  |  
  |             details::free_node(*node_allocator_,branch[0]); 
  |             details::free_node(*node_allocator_,branch[1]); 
  |  
  |             return synthesize_str_xrox_expression_impl<std::string&, const std::string>(opr, s0, s1, rp0); 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_srocsr_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             std::string&  s0 = static_cast<details::string_range_node<Type>*      >(branch[0])->ref  (); 
  |             std::string   s1 = static_cast<details::const_string_range_node<Type>*>(branch[1])->str  (); 
  |             range_t      rp0 = static_cast<details::string_range_node<Type>*      >(branch[0])->range(); 
  |             range_t      rp1 = static_cast<details::const_string_range_node<Type>*>(branch[1])->range(); 
  |  
  |             static_cast<details::string_range_node<Type>*>      (branch[0])->range_ref().clear(); 
  |             static_cast<details::const_string_range_node<Type>*>(branch[1])->range_ref().clear(); 
  |  
  |             details::free_node(*node_allocator_,branch[0]); 
  |             details::free_node(*node_allocator_,branch[1]); 
  |  
  |             return synthesize_str_xroxr_expression_impl<std::string&, const std::string>(opr, s0, s1, rp0, rp1); 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_csocs_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             const std::string s0 = static_cast<details::string_literal_node<Type>*>(branch[0])->str(); 
  |             const std::string s1 = static_cast<details::string_literal_node<Type>*>(branch[1])->str(); 
  |  
  |             expression_node_ptr result = error_node(); 
  |  
  |             if (details::e_add == opr) 
  |                result = node_allocator_->allocate_c<details::string_literal_node<Type> >(s0 + s1); 
  |             else if (details::e_in == opr) 
  |                result = node_allocator_->allocate_c<details::literal_node<Type> >(details::in_op   <Type>::process(s0,s1)); 
  |             else if (details::e_like == opr) 
  |                result = node_allocator_->allocate_c<details::literal_node<Type> >(details::like_op <Type>::process(s0,s1)); 
  |             else if (details::e_ilike == opr) 
  |                result = node_allocator_->allocate_c<details::literal_node<Type> >(details::ilike_op<Type>::process(s0,s1)); 
  |             else 
  |             { 
  |                expression_node_ptr temp = synthesize_sos_expression_impl<const std::string, const std::string>(opr, s0, s1); 
  |  
  |                const Type v = temp->value(); 
  |  
  |                details::free_node(*node_allocator_,temp); 
  |  
  |                result = node_allocator_->allocate<literal_node_t>(v); 
  |             } 
  |  
  |             details::free_all_nodes(*node_allocator_,branch); 
  |  
  |             return result; 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_csocsr_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             const std::string s0 = static_cast<details::string_literal_node<Type>*    >(branch[0])->str  (); 
  |                   std::string s1 = static_cast<details::const_string_range_node<Type>*>(branch[1])->str  (); 
  |             range_t          rp1 = static_cast<details::const_string_range_node<Type>*>(branch[1])->range(); 
  |  
  |             static_cast<details::const_string_range_node<Type>*>(branch[1])->range_ref().clear(); 
  |  
  |             details::free_node(*node_allocator_,branch[0]); 
  |             details::free_node(*node_allocator_,branch[1]); 
  |  
  |             return synthesize_str_xoxr_expression_impl<const std::string, const std::string>(opr, s0, s1, rp1); 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_csros_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             std::string   s0 = static_cast<details::const_string_range_node<Type>*>(branch[0])->str  (); 
  |             std::string&  s1 = static_cast<details::stringvar_node<Type>*         >(branch[1])->ref  (); 
  |             range_t      rp0 = static_cast<details::const_string_range_node<Type>*>(branch[0])->range(); 
  |  
  |             static_cast<details::const_string_range_node<Type>*>(branch[0])->range_ref().clear(); 
  |  
  |             details::free_node(*node_allocator_,branch[0]); 
  |  
  |             return synthesize_str_xrox_expression_impl<const std::string,std::string&>(opr, s0, s1, rp0); 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_csrosr_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             const std::string  s0 = static_cast<details::const_string_range_node<Type>*>(branch[0])->str  (); 
  |                   std::string& s1 = static_cast<details::string_range_node<Type>*      >(branch[1])->ref  (); 
  |             const range_t     rp0 = static_cast<details::const_string_range_node<Type>*>(branch[0])->range(); 
  |             const range_t     rp1 = static_cast<details::string_range_node<Type>*      >(branch[1])->range(); 
  |  
  |             static_cast<details::const_string_range_node<Type>*>(branch[0])->range_ref().clear(); 
  |             static_cast<details::string_range_node<Type>*>      (branch[1])->range_ref().clear(); 
  |  
  |             details::free_node(*node_allocator_,branch[0]); 
  |             details::free_node(*node_allocator_,branch[1]); 
  |  
  |             return synthesize_str_xroxr_expression_impl<const std::string,std::string&>(opr, s0, s1, rp0, rp1); 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_csrocs_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             const std::string s0 = static_cast<details::const_string_range_node<Type>*>(branch[0])->str  (); 
  |             const std::string s1 = static_cast<details::string_literal_node<Type>*    >(branch[1])->str  (); 
  |             const range_t    rp0 = static_cast<details::const_string_range_node<Type>*>(branch[0])->range(); 
  |  
  |             static_cast<details::const_string_range_node<Type>*>(branch[0])->range_ref().clear(); 
  |  
  |             details::free_all_nodes(*node_allocator_,branch); 
  |  
  |             return synthesize_str_xrox_expression_impl<const std::string,std::string>(opr, s0, s1, rp0); 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_csrocsr_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             const std::string s0 = static_cast<details::const_string_range_node<Type>*>(branch[0])->str  (); 
  |             const std::string s1 = static_cast<details::const_string_range_node<Type>*>(branch[1])->str  (); 
  |             const range_t    rp0 = static_cast<details::const_string_range_node<Type>*>(branch[0])->range(); 
  |             const range_t    rp1 = static_cast<details::const_string_range_node<Type>*>(branch[1])->range(); 
  |  
  |             static_cast<details::const_string_range_node<Type>*>(branch[0])->range_ref().clear(); 
  |             static_cast<details::const_string_range_node<Type>*>(branch[1])->range_ref().clear(); 
  |  
  |             details::free_all_nodes(*node_allocator_,branch); 
  |  
  |             return synthesize_str_xroxr_expression_impl<const std::string, const std::string>(opr, s0, s1, rp0, rp1); 
  |          } 
  |  
  |          inline expression_node_ptr synthesize_strogen_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             switch (opr) 
  |             { 
  |                #define case_stmt(op0, op1)                                                      \ 
  |                case op0 : return node_allocator_->                                              \ 
  |                              allocate_ttt<typename details::str_sogens_node<Type,op1<Type> > >  \ 
  |                                 (opr, branch[0], branch[1]);                                    \ 
  |  
  |                string_opr_switch_statements 
  |                #undef case_stmt 
  |                default : return error_node(); 
  |             } 
  |          } 
  |  
  |          #undef string_opr_switch_statements 
  |          #endif 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          inline expression_node_ptr synthesize_string_expression(const details::operator_type& opr, expression_node_ptr (&branch)[2]) 
  |          { 
  |             if ((0 == branch[0]) || (0 == branch[1])) 
  |             { 
  |                details::free_all_nodes(*node_allocator_,branch); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             const bool b0_is_s   = details::is_string_node            (branch[0]); 
  |             const bool b0_is_cs  = details::is_const_string_node      (branch[0]); 
  |             const bool b0_is_sr  = details::is_string_range_node      (branch[0]); 
  |             const bool b0_is_csr = details::is_const_string_range_node(branch[0]); 
  |  
  |             const bool b1_is_s   = details::is_string_node            (branch[1]); 
  |             const bool b1_is_cs  = details::is_const_string_node      (branch[1]); 
  |             const bool b1_is_sr  = details::is_string_range_node      (branch[1]); 
  |             const bool b1_is_csr = details::is_const_string_range_node(branch[1]); 
  |  
  |             const bool b0_is_gen = details::is_string_assignment_node (branch[0]) || 
  |                                    details::is_genricstring_range_node(branch[0]) || 
  |                                    details::is_string_concat_node     (branch[0]) || 
  |                                    details::is_string_function_node   (branch[0]) || 
  |                                    details::is_string_condition_node  (branch[0]) || 
  |                                    details::is_string_ccondition_node (branch[0]) || 
  |                                    details::is_string_vararg_node     (branch[0]) ; 
  |  
  |             const bool b1_is_gen = details::is_string_assignment_node (branch[1]) || 
  |                                    details::is_genricstring_range_node(branch[1]) || 
  |                                    details::is_string_concat_node     (branch[1]) || 
  |                                    details::is_string_function_node   (branch[1]) || 
  |                                    details::is_string_condition_node  (branch[1]) || 
  |                                    details::is_string_ccondition_node (branch[1]) || 
  |                                    details::is_string_vararg_node     (branch[1]) ; 
  |  
  |             if (details::e_add == opr) 
  |             { 
  |                if (!b0_is_cs || !b1_is_cs) 
  |                { 
  |                   return synthesize_expression<string_concat_node_t,2>(opr,branch); 
  |                } 
  |             } 
  |  
  |             if (b0_is_gen || b1_is_gen) 
  |             { 
  |                return synthesize_strogen_expression(opr,branch); 
  |             } 
  |             else if (b0_is_s) 
  |             { 
  |                if      (b1_is_s  ) return synthesize_sos_expression   (opr,branch); 
  |                else if (b1_is_cs ) return synthesize_socs_expression  (opr,branch); 
  |                else if (b1_is_sr ) return synthesize_sosr_expression  (opr,branch); 
  |                else if (b1_is_csr) return synthesize_socsr_expression (opr,branch); 
  |             } 
  |             else if (b0_is_cs) 
  |             { 
  |                if      (b1_is_s  ) return synthesize_csos_expression  (opr,branch); 
  |                else if (b1_is_cs ) return synthesize_csocs_expression (opr,branch); 
  |                else if (b1_is_sr ) return synthesize_csosr_expression (opr,branch); 
  |                else if (b1_is_csr) return synthesize_csocsr_expression(opr,branch); 
  |             } 
  |             else if (b0_is_sr) 
  |             { 
  |                if      (b1_is_s  ) return synthesize_sros_expression  (opr,branch); 
  |                else if (b1_is_sr ) return synthesize_srosr_expression (opr,branch); 
  |                else if (b1_is_cs ) return synthesize_srocs_expression (opr,branch); 
  |                else if (b1_is_csr) return synthesize_srocsr_expression(opr,branch); 
  |             } 
  |             else if (b0_is_csr) 
  |             { 
  |                if      (b1_is_s  ) return synthesize_csros_expression  (opr,branch); 
  |                else if (b1_is_sr ) return synthesize_csrosr_expression (opr,branch); 
  |                else if (b1_is_cs ) return synthesize_csrocs_expression (opr,branch); 
  |                else if (b1_is_csr) return synthesize_csrocsr_expression(opr,branch); 
  |             } 
  |  
  |             return error_node(); 
  |          } 
  |          #else 
  |          inline expression_node_ptr synthesize_string_expression(const details::operator_type&, expression_node_ptr (&branch)[2]) 
  |          { 
  |             details::free_all_nodes(*node_allocator_,branch); 
  |             return error_node(); 
  |          } 
  |          #endif 
  |  
  |          #ifndef exprtk_disable_string_capabilities 
  |          inline expression_node_ptr synthesize_string_expression(const details::operator_type& opr, expression_node_ptr (&branch)[3]) 
  |          { 
  |             if (details::e_inrange != opr) 
  |                return error_node(); 
  |             else if ((0 == branch[0]) || (0 == branch[1]) || (0 == branch[2])) 
  |             { 
  |                details::free_all_nodes(*node_allocator_,branch); 
  |  
  |                return error_node(); 
  |             } 
  |             else if ( 
  |                       details::is_const_string_node(branch[0]) && 
  |                       details::is_const_string_node(branch[1]) && 
  |                       details::is_const_string_node(branch[2]) 
  |                     ) 
  |             { 
  |                const std::string s0 = static_cast<details::string_literal_node<Type>*>(branch[0])->str(); 
  |                const std::string s1 = static_cast<details::string_literal_node<Type>*>(branch[1])->str(); 
  |                const std::string s2 = static_cast<details::string_literal_node<Type>*>(branch[2])->str(); 
  |  
  |                const Type v = (((s0 <= s1) && (s1 <= s2)) ? Type(1) : Type(0)); 
  |  
  |                details::free_all_nodes(*node_allocator_,branch); 
  |  
  |                return node_allocator_->allocate_c<details::literal_node<Type> >(v); 
  |             } 
  |             else if ( 
  |                       details::is_string_node(branch[0]) && 
  |                       details::is_string_node(branch[1]) && 
  |                       details::is_string_node(branch[2]) 
  |                     ) 
  |             { 
  |                std::string& s0 = static_cast<details::stringvar_node<Type>*>(branch[0])->ref(); 
  |                std::string& s1 = static_cast<details::stringvar_node<Type>*>(branch[1])->ref(); 
  |                std::string& s2 = static_cast<details::stringvar_node<Type>*>(branch[2])->ref(); 
  |  
  |                typedef typename details::sosos_node<Type, std::string&, std::string&, std::string&, details::inrange_op<Type> > inrange_t; 
  |  
  |                return node_allocator_->allocate_type<inrange_t, std::string&, std::string&, std::string&>(s0, s1, s2); 
  |             } 
  |             else if ( 
  |                       details::is_const_string_node(branch[0]) && 
  |                             details::is_string_node(branch[1]) && 
  |                       details::is_const_string_node(branch[2]) 
  |                     ) 
  |             { 
  |                std::string  s0 = static_cast<details::string_literal_node<Type>*>(branch[0])->str(); 
  |                std::string& s1 = static_cast<details::stringvar_node<Type>*     >(branch[1])->ref(); 
  |                std::string  s2 = static_cast<details::string_literal_node<Type>*>(branch[2])->str(); 
  |  
  |                typedef typename details::sosos_node<Type, std::string, std::string&, std::string, details::inrange_op<Type> > inrange_t; 
  |  
  |                details::free_node(*node_allocator_,branch[0]); 
  |                details::free_node(*node_allocator_,branch[2]); 
  |  
  |                return node_allocator_->allocate_type<inrange_t, std::string, std::string&, std::string>(s0, s1, s2); 
  |             } 
  |             else if ( 
  |                             details::is_string_node(branch[0]) && 
  |                       details::is_const_string_node(branch[1]) && 
  |                             details::is_string_node(branch[2]) 
  |                     ) 
  |             { 
  |                std::string&  s0 = static_cast<details::stringvar_node<Type>*     >(branch[0])->ref(); 
  |                std::string   s1 = static_cast<details::string_literal_node<Type>*>(branch[1])->str(); 
  |                std::string&  s2 = static_cast<details::stringvar_node<Type>*     >(branch[2])->ref(); 
  |  
  |                typedef typename details::sosos_node<Type, std::string&, std::string, std::string&, details::inrange_op<Type> > inrange_t; 
  |  
  |                details::free_node(*node_allocator_,branch[1]); 
  |  
  |                return node_allocator_->allocate_type<inrange_t, std::string&, std::string, std::string&>(s0, s1, s2); 
  |             } 
  |             else if ( 
  |                       details::is_string_node(branch[0]) && 
  |                       details::is_string_node(branch[1]) && 
  |                       details::is_const_string_node(branch[2]) 
  |                     ) 
  |             { 
  |                std::string& s0 = static_cast<details::stringvar_node<Type>*     >(branch[0])->ref(); 
  |                std::string& s1 = static_cast<details::stringvar_node<Type>*     >(branch[1])->ref(); 
  |                std::string  s2 = static_cast<details::string_literal_node<Type>*>(branch[2])->str(); 
  |  
  |                typedef typename details::sosos_node<Type, std::string&, std::string&, std::string, details::inrange_op<Type> > inrange_t; 
  |  
  |                details::free_node(*node_allocator_,branch[2]); 
  |  
  |                return node_allocator_->allocate_type<inrange_t, std::string&, std::string&, std::string>(s0, s1, s2); 
  |             } 
  |             else if ( 
  |                       details::is_const_string_node(branch[0]) && 
  |                       details::      is_string_node(branch[1]) && 
  |                       details::      is_string_node(branch[2]) 
  |                     ) 
  |             { 
  |                std::string  s0 = static_cast<details::string_literal_node<Type>*>(branch[0])->str(); 
  |                std::string& s1 = static_cast<details::stringvar_node<Type>*     >(branch[1])->ref(); 
  |                std::string& s2 = static_cast<details::stringvar_node<Type>*     >(branch[2])->ref(); 
  |  
  |                typedef typename details::sosos_node<Type, std::string, std::string&, std::string&, details::inrange_op<Type> > inrange_t; 
  |  
  |                details::free_node(*node_allocator_,branch[0]); 
  |  
  |                return node_allocator_->allocate_type<inrange_t, std::string, std::string&, std::string&>(s0, s1, s2); 
  |             } 
  |             else 
  |                return error_node(); 
  |          } 
  |          #else 
  |          inline expression_node_ptr synthesize_string_expression(const details::operator_type&, expression_node_ptr (&branch)[3]) 
  |          { 
  |             details::free_all_nodes(*node_allocator_,branch); 
  |             return error_node(); 
  |          } 
  |          #endif 
  |  
  |          inline expression_node_ptr synthesize_null_expression(const details::operator_type& operation, expression_node_ptr (&branch)[2]) 
  |          { 
  |             /* 
  |              Note: The following are the type promotion rules 
  |              that relate to operations that include 'null': 
  |              0. null ==/!=     null --> true false 
  |              1. null operation null --> null 
  |              2. x    ==/!=     null --> true/false 
  |              3. null ==/!=     x    --> true/false 
  |              4. x   operation  null --> x 
  |              5. null operation x    --> x 
  |             */ 
  |  
  |             typedef typename details::null_eq_node<T> nulleq_node_t; 
  |  
  |             const bool b0_null = details::is_null_node(branch[0]); 
  |             const bool b1_null = details::is_null_node(branch[1]); 
  |  
  |             if (b0_null && b1_null) 
  |             { 
  |                expression_node_ptr result = error_node(); 
  |  
  |                if (details::e_eq == operation) 
  |                   result = node_allocator_->allocate_c<literal_node_t>(T(1)); 
  |                else if (details::e_ne == operation) 
  |                   result = node_allocator_->allocate_c<literal_node_t>(T(0)); 
  |  
  |                if (result) 
  |                { 
  |                   details::free_node(*node_allocator_,branch[0]); 
  |                   details::free_node(*node_allocator_,branch[1]); 
  |  
  |                   return result; 
  |                } 
  |  
  |                details::free_node(*node_allocator_,branch[1]); 
  |  
  |                return branch[0]; 
  |             } 
  |             else if (details::e_eq == operation) 
  |             { 
  |                expression_node_ptr result = node_allocator_-> 
  |                                                 allocate_rc<nulleq_node_t>(branch[b0_null ? 0 : 1],true); 
  |  
  |                details::free_node(*node_allocator_,branch[b0_null ? 1 : 0]); 
  |  
  |                return result; 
  |             } 
  |             else if (details::e_ne == operation) 
  |             { 
  |                expression_node_ptr result = node_allocator_-> 
  |                                                 allocate_rc<nulleq_node_t>(branch[b0_null ? 0 : 1],false); 
  |  
  |                details::free_node(*node_allocator_,branch[b0_null ? 1 : 0]); 
  |  
  |                return result; 
  |             } 
  |             else if (b0_null) 
  |             { 
  |                details::free_node(*node_allocator_,branch[0]); 
  |                branch[0] = branch[1]; 
  |                branch[1] = error_node(); 
  |             } 
  |             else if (b1_null) 
  |             { 
  |                details::free_node(*node_allocator_,branch[1]); 
  |                branch[1] = error_node(); 
  |             } 
  |  
  |             if ( 
  |                  (details::e_add == operation) || (details::e_sub == operation) || 
  |                  (details::e_mul == operation) || (details::e_div == operation) || 
  |                  (details::e_mod == operation) || (details::e_pow == operation) 
  |                ) 
  |             { 
  |                return branch[0]; 
  |             } 
  |  
  |             details::free_node(*node_allocator_, branch[0]); 
  |  
  |             if ( 
  |                  (details::e_lt    == operation) || (details::e_lte  == operation) || 
  |                  (details::e_gt    == operation) || (details::e_gte  == operation) || 
  |                  (details::e_and   == operation) || (details::e_nand == operation) || 
  |                  (details::e_or    == operation) || (details::e_nor  == operation) || 
  |                  (details::e_xor   == operation) || (details::e_xnor == operation) || 
  |                  (details::e_in    == operation) || (details::e_like == operation) || 
  |                  (details::e_ilike == operation) 
  |                ) 
  |             { 
  |                return node_allocator_->allocate_c<literal_node_t>(T(0)); 
  |             } 
  |  
  |             return node_allocator_->allocate<details::null_node<Type> >(); 
  |          } 
  |  
  |          template <typename NodeType, std::size_t N> 
  |          inline expression_node_ptr synthesize_expression(const details::operator_type& operation, expression_node_ptr (&branch)[N]) 
  |          { 
  |             if ( 
  |                  (details::e_in    == operation) || 
  |                  (details::e_like  == operation) || 
  |                  (details::e_ilike == operation) 
  |                ) 
  |             { 
  |                free_all_nodes(*node_allocator_,branch); 
  |  
  |                return error_node(); 
  |             } 
  |             else if (!details::all_nodes_valid<N>(branch)) 
  |             { 
  |                free_all_nodes(*node_allocator_,branch); 
  |  
  |                return error_node(); 
  |             } 
  |             else if ((details::e_default != operation)) 
  |             { 
  |                // Attempt simple constant folding optimisation. 
  |                expression_node_ptr expression_point = node_allocator_->allocate<NodeType>(operation,branch); 
  |  
  |                if (is_constant_foldable<N>(branch)) 
  |                { 
  |                   const Type v = expression_point->value(); 
  |                   details::free_node(*node_allocator_,expression_point); 
  |  
  |                   return node_allocator_->allocate<literal_node_t>(v); 
  |                } 
  |  
  |                if (expression_point && expression_point->valid()) 
  |                { 
  |                   return expression_point; 
  |                } 
  |  
  |                parser_->set_error(parser_error::make_error( 
  |                   parser_error::e_parser, 
  |                   token_t(), 
  |                   "ERR276 - Failed to synthesize node: NodeType", 
  |                   exprtk_error_location)); 
  |  
  |                details::free_node(*node_allocator_, expression_point); 
  |             } 
  |  
  |             return error_node(); 
  |          } 
  |  
  |          template <typename NodeType, std::size_t N> 
  |          inline expression_node_ptr synthesize_expression(F* f, expression_node_ptr (&branch)[N]) 
  |          { 
  |             if (!details::all_nodes_valid<N>(branch)) 
  |             { 
  |                free_all_nodes(*node_allocator_,branch); 
  |  
  |                return error_node(); 
  |             } 
  |  
  |             typedef typename details::function_N_node<T,ifunction_t,N> function_N_node_t; 
  |  
  |             // Attempt simple constant folding optimisation. 
  |  
  |             expression_node_ptr expression_point = node_allocator_->allocate<NodeType>(f); 
  |             function_N_node_t* func_node_ptr = dynamic_cast<function_N_node_t*>(expression_point); 
  |  
  |             if (0 == func_node_ptr) 
  |             { 
  |                free_all_nodes(*node_allocator_,branch); 
  |  
  |                return error_node(); 
  |             } 
  |             else 
  |                func_node_ptr->init_branches(branch); 
  |  
  |             if (is_constant_foldable<N>(branch) && !f->has_side_effects()) 
  |             { 
  |                Type v = expression_point->value(); 
  |                details::free_node(*node_allocator_,expression_point); 
  |  
  |                return node_allocator_->allocate<literal_node_t>(v); 
  |             } 
  |  
  |             parser_->state_.activate_side_effect("synthesize_expression(function<NT,N>)"); 
  |  
  |             return expression_point; 
  |          } 
  |  
  |          bool                     strength_reduction_enabled_; 
  |          details::node_allocator* node_allocator_; 
  |          synthesize_map_t         synthesize_map_; 
  |          unary_op_map_t*          unary_op_map_; 
  |          binary_op_map_t*         binary_op_map_; 
  |          inv_binary_op_map_t*     inv_binary_op_map_; 
  |          sf3_map_t*               sf3_map_; 
  |          sf4_map_t*               sf4_map_; 
  |          parser_t*                parser_; 
  |       }; // class expression_generator 
  |  
  |       inline void set_error(const parser_error::type& error_type) 
  |       { 
  |          error_list_.push_back(error_type); 
  |       } 
  |  
  |       inline void remove_last_error() 
  |       { 
  |          if (!error_list_.empty()) 
  |          { 
  |             error_list_.pop_back(); 
  |          } 
  |       } 
  |  
  |       inline void set_synthesis_error(const std::string& synthesis_error_message) 
  |       { 
  |          if (synthesis_error_.empty()) 
  |          { 
  |             synthesis_error_ = synthesis_error_message; 
  |          } 
  |       } 
  |  
  |       inline void register_local_vars(expression<T>& e) 
  |       { 
  |          for (std::size_t i = 0; i < sem_.size(); ++i) 
  |          { 
  |             scope_element& se = sem_.get_element(i); 
  |  
  |             exprtk_debug(("register_local_vars() - se[%s]\n", se.name.c_str())); 
  |  
  |             if ( 
  |                  (scope_element::e_variable == se.type) || 
  |                  (scope_element::e_literal  == se.type) || 
  |                  (scope_element::e_vecelem  == se.type) 
  |                ) 
  |             { 
  |                if (se.var_node) 
  |                { 
  |                   e.register_local_var(se.var_node); 
  |                } 
  |  
  |                if (se.data) 
  |                { 
  |                   e.register_local_data(se.data, 1, 0); 
  |                } 
  |             } 
  |             else if (scope_element::e_vector == se.type) 
  |             { 
  |                if (se.vec_node) 
  |                { 
  |                   e.register_local_var(se.vec_node); 
  |                } 
  |  
  |                if (se.data) 
  |                { 
  |                   e.register_local_data(se.data, se.size, 1); 
  |                } 
  |             } 
  |             #ifndef exprtk_disable_string_capabilities 
  |             else if (scope_element::e_string == se.type) 
  |             { 
  |                if (se.str_node) 
  |                { 
  |                   e.register_local_var(se.str_node); 
  |                } 
  |  
  |                if (se.data) 
  |                { 
  |                   e.register_local_data(se.data, se.size, 2); 
  |                } 
  |             } 
  |             #endif 
  |  
  |             se.var_node  = 0; 
  |             se.vec_node  = 0; 
  |             #ifndef exprtk_disable_string_capabilities 
  |             se.str_node  = 0; 
  |             #endif 
  |             se.data      = 0; 
  |             se.ref_count = 0; 
  |             se.active    = false; 
  |          } 
  |       } 
  |  
  |       inline void register_return_results(expression<T>& e) 
  |       { 
  |          e.register_return_results(results_context_); 
  |          results_context_ = 0; 
  |       } 
  |  
  |       inline void load_unary_operations_map(unary_op_map_t& m) 
  |       { 
  |          #define register_unary_op(Op, UnaryFunctor)            \ 
  |          m.insert(std::make_pair(Op,UnaryFunctor<T>::process)); \ 
  |  
  |          register_unary_op(details::e_abs   , details::abs_op  ) 
  |          register_unary_op(details::e_acos  , details::acos_op ) 
  |          register_unary_op(details::e_acosh , details::acosh_op) 
  |          register_unary_op(details::e_asin  , details::asin_op ) 
  |          register_unary_op(details::e_asinh , details::asinh_op) 
  |          register_unary_op(details::e_atanh , details::atanh_op) 
  |          register_unary_op(details::e_ceil  , details::ceil_op ) 
  |          register_unary_op(details::e_cos   , details::cos_op  ) 
  |          register_unary_op(details::e_cosh  , details::cosh_op ) 
  |          register_unary_op(details::e_exp   , details::exp_op  ) 
  |          register_unary_op(details::e_expm1 , details::expm1_op) 
  |          register_unary_op(details::e_floor , details::floor_op) 
  |          register_unary_op(details::e_log   , details::log_op  ) 
  |          register_unary_op(details::e_log10 , details::log10_op) 
  |          register_unary_op(details::e_log2  , details::log2_op ) 
  |          register_unary_op(details::e_log1p , details::log1p_op) 
  |          register_unary_op(details::e_neg   , details::neg_op  ) 
  |          register_unary_op(details::e_pos   , details::pos_op  ) 
  |          register_unary_op(details::e_round , details::round_op) 
  |          register_unary_op(details::e_sin   , details::sin_op  ) 
  |          register_unary_op(details::e_sinc  , details::sinc_op ) 
  |          register_unary_op(details::e_sinh  , details::sinh_op ) 
  |          register_unary_op(details::e_sqrt  , details::sqrt_op ) 
  |          register_unary_op(details::e_tan   , details::tan_op  ) 
  |          register_unary_op(details::e_tanh  , details::tanh_op ) 
  |          register_unary_op(details::e_cot   , details::cot_op  ) 
  |          register_unary_op(details::e_sec   , details::sec_op  ) 
  |          register_unary_op(details::e_csc   , details::csc_op  ) 
  |          register_unary_op(details::e_r2d   , details::r2d_op  ) 
  |          register_unary_op(details::e_d2r   , details::d2r_op  ) 
  |          register_unary_op(details::e_d2g   , details::d2g_op  ) 
  |          register_unary_op(details::e_g2d   , details::g2d_op  ) 
  |          register_unary_op(details::e_notl  , details::notl_op ) 
  |          register_unary_op(details::e_sgn   , details::sgn_op  ) 
  |          register_unary_op(details::e_erf   , details::erf_op  ) 
  |          register_unary_op(details::e_erfc  , details::erfc_op ) 
  |          register_unary_op(details::e_ncdf  , details::ncdf_op ) 
  |          register_unary_op(details::e_frac  , details::frac_op ) 
  |          register_unary_op(details::e_trunc , details::trunc_op) 
  |          #undef register_unary_op 
  |       } 
  |  
  |       inline void load_binary_operations_map(binary_op_map_t& m) 
  |       { 
  |          typedef typename binary_op_map_t::value_type value_type; 
  |  
  |          #define register_binary_op(Op, BinaryFunctor)       \ 
  |          m.insert(value_type(Op,BinaryFunctor<T>::process)); \ 
  |  
  |          register_binary_op(details::e_add  , details::add_op ) 
  |          register_binary_op(details::e_sub  , details::sub_op ) 
  |          register_binary_op(details::e_mul  , details::mul_op ) 
  |          register_binary_op(details::e_div  , details::div_op ) 
  |          register_binary_op(details::e_mod  , details::mod_op ) 
  |          register_binary_op(details::e_pow  , details::pow_op ) 
  |          register_binary_op(details::e_lt   , details::lt_op  ) 
  |          register_binary_op(details::e_lte  , details::lte_op ) 
  |          register_binary_op(details::e_gt   , details::gt_op  ) 
  |          register_binary_op(details::e_gte  , details::gte_op ) 
  |          register_binary_op(details::e_eq   , details::eq_op  ) 
  |          register_binary_op(details::e_ne   , details::ne_op  ) 
  |          register_binary_op(details::e_and  , details::and_op ) 
  |          register_binary_op(details::e_nand , details::nand_op) 
  |          register_binary_op(details::e_or   , details::or_op  ) 
  |          register_binary_op(details::e_nor  , details::nor_op ) 
  |          register_binary_op(details::e_xor  , details::xor_op ) 
  |          register_binary_op(details::e_xnor , details::xnor_op) 
  |          #undef register_binary_op 
  |       } 
  |  
  |       inline void load_inv_binary_operations_map(inv_binary_op_map_t& m) 
  |       { 
  |          typedef typename inv_binary_op_map_t::value_type value_type; 
  |  
  |          #define register_binary_op(Op, BinaryFunctor)       \ 
  |          m.insert(value_type(BinaryFunctor<T>::process,Op)); \ 
  |  
  |          register_binary_op(details::e_add  , details::add_op ) 
  |          register_binary_op(details::e_sub  , details::sub_op ) 
  |          register_binary_op(details::e_mul  , details::mul_op ) 
  |          register_binary_op(details::e_div  , details::div_op ) 
  |          register_binary_op(details::e_mod  , details::mod_op ) 
  |          register_binary_op(details::e_pow  , details::pow_op ) 
  |          register_binary_op(details::e_lt   , details::lt_op  ) 
  |          register_binary_op(details::e_lte  , details::lte_op ) 
  |          register_binary_op(details::e_gt   , details::gt_op  ) 
  |          register_binary_op(details::e_gte  , details::gte_op ) 
  |          register_binary_op(details::e_eq   , details::eq_op  ) 
  |          register_binary_op(details::e_ne   , details::ne_op  ) 
  |          register_binary_op(details::e_and  , details::and_op ) 
  |          register_binary_op(details::e_nand , details::nand_op) 
  |          register_binary_op(details::e_or   , details::or_op  ) 
  |          register_binary_op(details::e_nor  , details::nor_op ) 
  |          register_binary_op(details::e_xor  , details::xor_op ) 
  |          register_binary_op(details::e_xnor , details::xnor_op) 
  |          #undef register_binary_op 
  |       } 
  |  
  |       inline void load_sf3_map(sf3_map_t& sf3_map) 
  |       { 
  |          typedef std::pair<trinary_functor_t,details::operator_type> pair_t; 
  |  
  |          #define register_sf3(Op)                                                                             \ 
  |          sf3_map[details::sf##Op##_op<T>::id()] = pair_t(details::sf##Op##_op<T>::process,details::e_sf##Op); \ 
  |  
  |          register_sf3(00) register_sf3(01) register_sf3(02) register_sf3(03) 
  |          register_sf3(04) register_sf3(05) register_sf3(06) register_sf3(07) 
  |          register_sf3(08) register_sf3(09) register_sf3(10) register_sf3(11) 
  |          register_sf3(12) register_sf3(13) register_sf3(14) register_sf3(15) 
  |          register_sf3(16) register_sf3(17) register_sf3(18) register_sf3(19) 
  |          register_sf3(20) register_sf3(21) register_sf3(22) register_sf3(23) 
  |          register_sf3(24) register_sf3(25) register_sf3(26) register_sf3(27) 
  |          register_sf3(28) register_sf3(29) register_sf3(30) 
  |          #undef register_sf3 
  |  
  |          #define register_sf3_extid(Id, Op)                                        \ 
  |          sf3_map[Id] = pair_t(details::sf##Op##_op<T>::process,details::e_sf##Op); \ 
  |  
  |          register_sf3_extid("(t-t)-t",23)  // (t-t)-t --> t-(t+t) 
  |          #undef register_sf3_extid 
  |       } 
  |  
  |       inline void load_sf4_map(sf4_map_t& sf4_map) 
  |       { 
  |          typedef std::pair<quaternary_functor_t,details::operator_type> pair_t; 
  |  
  |          #define register_sf4(Op)                                                                             \ 
  |          sf4_map[details::sf##Op##_op<T>::id()] = pair_t(details::sf##Op##_op<T>::process,details::e_sf##Op); \ 
  |  
  |          register_sf4(48) register_sf4(49) register_sf4(50) register_sf4(51) 
  |          register_sf4(52) register_sf4(53) register_sf4(54) register_sf4(55) 
  |          register_sf4(56) register_sf4(57) register_sf4(58) register_sf4(59) 
  |          register_sf4(60) register_sf4(61) register_sf4(62) register_sf4(63) 
  |          register_sf4(64) register_sf4(65) register_sf4(66) register_sf4(67) 
  |          register_sf4(68) register_sf4(69) register_sf4(70) register_sf4(71) 
  |          register_sf4(72) register_sf4(73) register_sf4(74) register_sf4(75) 
  |          register_sf4(76) register_sf4(77) register_sf4(78) register_sf4(79) 
  |          register_sf4(80) register_sf4(81) register_sf4(82) register_sf4(83) 
  |          #undef register_sf4 
  |  
  |          #define register_sf4ext(Op)                                                                                    \ 
  |          sf4_map[details::sfext##Op##_op<T>::id()] = pair_t(details::sfext##Op##_op<T>::process,details::e_sf4ext##Op); \ 
  |  
  |          register_sf4ext(00) register_sf4ext(01) register_sf4ext(02) register_sf4ext(03) 
  |          register_sf4ext(04) register_sf4ext(05) register_sf4ext(06) register_sf4ext(07) 
  |          register_sf4ext(08) register_sf4ext(09) register_sf4ext(10) register_sf4ext(11) 
  |          register_sf4ext(12) register_sf4ext(13) register_sf4ext(14) register_sf4ext(15) 
  |          register_sf4ext(16) register_sf4ext(17) register_sf4ext(18) register_sf4ext(19) 
  |          register_sf4ext(20) register_sf4ext(21) register_sf4ext(22) register_sf4ext(23) 
  |          register_sf4ext(24) register_sf4ext(25) register_sf4ext(26) register_sf4ext(27) 
  |          register_sf4ext(28) register_sf4ext(29) register_sf4ext(30) register_sf4ext(31) 
  |          register_sf4ext(32) register_sf4ext(33) register_sf4ext(34) register_sf4ext(35) 
  |          register_sf4ext(36) register_sf4ext(36) register_sf4ext(38) register_sf4ext(39) 
  |          register_sf4ext(40) register_sf4ext(41) register_sf4ext(42) register_sf4ext(43) 
  |          register_sf4ext(44) register_sf4ext(45) register_sf4ext(46) register_sf4ext(47) 
  |          register_sf4ext(48) register_sf4ext(49) register_sf4ext(50) register_sf4ext(51) 
  |          register_sf4ext(52) register_sf4ext(53) register_sf4ext(54) register_sf4ext(55) 
  |          register_sf4ext(56) register_sf4ext(57) register_sf4ext(58) register_sf4ext(59) 
  |          register_sf4ext(60) register_sf4ext(61) 
  |          #undef register_sf4ext 
  |       } 
  |  
  |       inline results_context_t& results_ctx() 
  |       { 
  |          if (0 == results_context_) 
  |          { 
  |             results_context_ = new results_context_t(); 
  |          } 
  |  
  |          return (*results_context_); 
  |       } 
  |  
  |       inline void return_cleanup() 
  |       { 
  |          #ifndef exprtk_disable_return_statement 
  |          if (results_context_) 
  |          { 
  |             delete results_context_; 
  |             results_context_ = 0; 
  |          } 
  |  
  |          state_.return_stmt_present = false; 
  |          #endif 
  |       } 
  |  
  |    private: 
  |  
  |       parser(const parser<T>&) exprtk_delete; 
  |       parser<T>& operator=(const parser<T>&) exprtk_delete; 
  |  
  |       settings_store settings_; 
  |       expression_generator<T> expression_generator_; 
  |       details::node_allocator node_allocator_; 
  |       symtab_store symtab_store_; 
  |       dependent_entity_collector dec_; 
  |       std::deque<parser_error::type> error_list_; 
  |       std::deque<bool> brkcnt_list_; 
  |       parser_state state_; 
  |       bool resolve_unknown_symbol_; 
  |       results_context_t* results_context_; 
  |       unknown_symbol_resolver* unknown_symbol_resolver_; 
  |       unknown_symbol_resolver default_usr_; 
  |       base_ops_map_t base_ops_map_; 
  |       unary_op_map_t unary_op_map_; 
  |       binary_op_map_t binary_op_map_; 
  |       inv_binary_op_map_t inv_binary_op_map_; 
  |       sf3_map_t sf3_map_; 
  |       sf4_map_t sf4_map_; 
  |       std::string synthesis_error_; 
  |       scope_element_manager sem_; 
  |       std::vector<state_t> current_state_stack_; 
  |  
  |       immutable_memory_map_t immutable_memory_map_; 
  |       immutable_symtok_map_t immutable_symtok_map_; 
  |  
  |       lexer::helper::helper_assembly helper_assembly_; 
  |  
  |       lexer::helper::commutative_inserter       commutative_inserter_; 
  |       lexer::helper::operator_joiner            operator_joiner_2_; 
  |       lexer::helper::operator_joiner            operator_joiner_3_; 
  |       lexer::helper::symbol_replacer            symbol_replacer_; 
  |       lexer::helper::bracket_checker            bracket_checker_; 
  |       lexer::helper::numeric_checker<T>         numeric_checker_; 
  |       lexer::helper::sequence_validator         sequence_validator_; 
  |       lexer::helper::sequence_validator_3tokens sequence_validator_3tkns_; 
  |  
  |       loop_runtime_check_ptr          loop_runtime_check_; 
  |       vector_access_runtime_check_ptr vector_access_runtime_check_; 
  |       compilation_check_ptr           compilation_check_ptr_; 
  |       assert_check_ptr                assert_check_; 
  |       std::set<std::string>           assert_ids_; 
  |  
  |       template <typename ParserType> 
  |       friend void details::disable_type_checking(ParserType& p); 
  |    }; // class parser 
  |  
  |    namespace details 
  |    { 
  |       template <typename T> 
  |       struct collector_helper 
  |       { 
  |          typedef exprtk::symbol_table<T> symbol_table_t; 
  |          typedef exprtk::expression<T>   expression_t; 
  |          typedef exprtk::parser<T>       parser_t; 
  |          typedef typename parser_t::dependent_entity_collector::symbol_t symbol_t; 
  |          typedef typename parser_t::unknown_symbol_resolver usr_t; 
  |  
  |          struct resolve_as_vector : public usr_t 
  |          { 
  |             typedef exprtk::parser<T> parser_t; 
  |  
  |             using usr_t::process; 
  |  
  |             resolve_as_vector() 
  |             : usr_t(usr_t::e_usrmode_extended) 
  |             {} 
  |  
  |             virtual bool process(const std::string& unknown_symbol, 
  |                                  symbol_table_t& symbol_table, 
  |                                  std::string&) exprtk_override 
  |             { 
  |                static T v[1]; 
  |                symbol_table.add_vector(unknown_symbol,v); 
  |                return true; 
  |             } 
  |          }; 
  |  
  |          static inline bool collection_pass(const std::string& expression_string, 
  |                                             std::set<std::string>& symbol_set, 
  |                                             const bool collect_variables, 
  |                                             const bool collect_functions, 
  |                                             const bool vector_pass, 
  |                                             symbol_table_t& ext_symbol_table) 
  |          { 
  |             symbol_table_t symbol_table; 
  |             expression_t   expression; 
  |             parser_t       parser; 
  |  
  |             resolve_as_vector vect_resolver; 
  |  
  |             expression.register_symbol_table(symbol_table    ); 
  |             expression.register_symbol_table(ext_symbol_table); 
  |  
  |             if (vector_pass) 
  |                parser.enable_unknown_symbol_resolver(&vect_resolver); 
  |             else 
  |                parser.enable_unknown_symbol_resolver(); 
  |  
  |             if (collect_variables) 
  |                parser.dec().collect_variables() = true; 
  |  
  |             if (collect_functions) 
  |                parser.dec().collect_functions() = true; 
  |  
  |             bool pass_result = false; 
  |  
  |             details::disable_type_checking(parser); 
  |  
  |             if (parser.compile(expression_string, expression)) 
  |             { 
  |                pass_result = true; 
  |  
  |                std::deque<symbol_t> symb_list; 
  |                parser.dec().symbols(symb_list); 
  |  
  |                for (std::size_t i = 0; i < symb_list.size(); ++i) 
  |                { 
  |                   symbol_set.insert(symb_list[i].first); 
  |                } 
  |             } 
  |  
  |             return pass_result; 
  |          } 
  |       }; 
  |    } 
  |  
  |    template <typename Allocator, 
  |              template <typename, typename> class Sequence> 
  |    inline bool collect_variables(const std::string& expression, 
  |                                  Sequence<std::string, Allocator>& symbol_list) 
  |    { 
  |       typedef double T; 
  |       typedef details::collector_helper<T> collect_t; 
  |  
  |       collect_t::symbol_table_t null_symbol_table; 
  |  
  |       std::set<std::string> symbol_set; 
  |  
  |       const bool variable_pass = collect_t::collection_pass 
  |                                     (expression, symbol_set, true, false, false, null_symbol_table); 
  |       const bool vector_pass   = collect_t::collection_pass 
  |                                     (expression, symbol_set, true, false,  true, null_symbol_table); 
  |  
  |       if (!variable_pass && !vector_pass) 
  |          return false; 
  |  
  |       std::set<std::string>::iterator itr = symbol_set.begin(); 
  |  
  |       while (symbol_set.end() != itr) 
  |       { 
  |          symbol_list.push_back(*itr); 
  |          ++itr; 
  |       } 
  |  
  |       return true; 
  |    } 
  |  
  |    template <typename T, 
  |              typename Allocator, 
  |              template <typename, typename> class Sequence> 
  |    inline bool collect_variables(const std::string& expression, 
  |                                  exprtk::symbol_table<T>& extrnl_symbol_table, 
  |                                  Sequence<std::string, Allocator>& symbol_list) 
  |    { 
  |       typedef details::collector_helper<T> collect_t; 
  |  
  |       std::set<std::string> symbol_set; 
  |  
  |       const bool variable_pass = collect_t::collection_pass 
  |                                     (expression, symbol_set, true, false, false, extrnl_symbol_table); 
  |       const bool vector_pass   = collect_t::collection_pass 
  |                                     (expression, symbol_set, true, false,  true, extrnl_symbol_table); 
  |  
  |       if (!variable_pass && !vector_pass) 
  |          return false; 
  |  
  |       std::set<std::string>::iterator itr = symbol_set.begin(); 
  |  
  |       while (symbol_set.end() != itr) 
  |       { 
  |          symbol_list.push_back(*itr); 
  |          ++itr; 
  |       } 
  |  
  |       return true; 
  |    } 
  |  
  |    template <typename Allocator, 
  |              template <typename, typename> class Sequence> 
  |    inline bool collect_functions(const std::string& expression, 
  |                                  Sequence<std::string, Allocator>& symbol_list) 
  |    { 
  |       typedef double T; 
  |       typedef details::collector_helper<T> collect_t; 
  |  
  |       collect_t::symbol_table_t null_symbol_table; 
  |  
  |       std::set<std::string> symbol_set; 
  |  
  |       const bool variable_pass = collect_t::collection_pass 
  |                                     (expression, symbol_set, false, true, false, null_symbol_table); 
  |       const bool vector_pass   = collect_t::collection_pass 
  |                                     (expression, symbol_set, false, true,  true, null_symbol_table); 
  |  
  |       if (!variable_pass && !vector_pass) 
  |          return false; 
  |  
  |       std::set<std::string>::iterator itr = symbol_set.begin(); 
  |  
  |       while (symbol_set.end() != itr) 
  |       { 
  |          symbol_list.push_back(*itr); 
  |          ++itr; 
  |       } 
  |  
  |       return true; 
  |    } 
  |  
  |    template <typename T, 
  |              typename Allocator, 
  |              template <typename, typename> class Sequence> 
  |    inline bool collect_functions(const std::string& expression, 
  |                                  exprtk::symbol_table<T>& extrnl_symbol_table, 
  |                                  Sequence<std::string, Allocator>& symbol_list) 
  |    { 
  |       typedef details::collector_helper<T> collect_t; 
  |  
  |       std::set<std::string> symbol_set; 
  |  
  |       const bool variable_pass = collect_t::collection_pass 
  |                                     (expression, symbol_set, false, true, false, extrnl_symbol_table); 
  |       const bool vector_pass   = collect_t::collection_pass 
  |                                     (expression, symbol_set, false, true,  true, extrnl_symbol_table); 
  |  
  |       if (!variable_pass && !vector_pass) 
  |          return false; 
  |  
  |       std::set<std::string>::iterator itr = symbol_set.begin(); 
  |  
  |       while (symbol_set.end() != itr) 
  |       { 
  |          symbol_list.push_back(*itr); 
  |          ++itr; 
  |       } 
  |  
  |       return true; 
  |    } 
  |  
  |    template <typename T> 
  |    inline T integrate(const expression<T>& e, 
  |                       T& x, 
  |                       const T& r0, const T& r1, 
  |                       const std::size_t number_of_intervals = 1000000) 
  |    { 
  |       if (r0 > r1) 
  |          return T(0); 
  |  
  |       const T h = (r1 - r0) / (T(2) * number_of_intervals); 
  |       T total_area = T(0); 
  |  
  |       for (std::size_t i = 0; i < number_of_intervals; ++i) 
  |       { 
  |          x = r0 + T(2) * i * h; 
  |          const T y0 = e.value(); x += h; 
  |          const T y1 = e.value(); x += h; 
  |          const T y2 = e.value(); x += h; 
  |          total_area += h * (y0 + T(4) * y1 + y2) / T(3); 
  |       } 
  |  
  |       return total_area; 
  |    } 
  |  
  |    template <typename T> 
  |    inline T integrate(const expression<T>& e, 
  |                       const std::string& variable_name, 
  |                       const T& r0, const T& r1, 
  |                       const std::size_t number_of_intervals = 1000000) 
  |    { 
  |       const symbol_table<T>& sym_table = e.get_symbol_table(); 
  |  
  |       if (!sym_table.valid()) 
  |       { 
  |          return std::numeric_limits<T>::quiet_NaN(); 
  |       } 
  |  
  |       details::variable_node<T>* var = sym_table.get_variable(variable_name); 
  |  
  |       if (var) 
  |       { 
  |          T& x = var->ref(); 
  |          const T x_original = x; 
  |          const T result = integrate(e, x, r0, r1, number_of_intervals); 
  |          x = x_original; 
  |  
  |          return result; 
  |       } 
  |  
  |       return std::numeric_limits<T>::quiet_NaN(); 
  |    } 
  |  
  |    template <typename T> 
  |    inline T derivative(const expression<T>& e, 
  |                        T& x, 
  |                        const T& h = T(0.00000001)) 
  |    { 
  |       const T x_init = x; 
  |       const T _2h    = T(2) * h; 
  |  
  |       x = x_init + _2h; 
  |       const T y0 = e.value(); 
  |       x = x_init + h; 
  |       const T y1 = e.value(); 
  |       x = x_init - h; 
  |       const T y2 = e.value(); 
  |       x = x_init - _2h; 
  |       const T y3 = e.value(); 
  |       x = x_init; 
  |  
  |       return (-y0 + T(8) * (y1 - y2) + y3) / (T(12) * h); 
  |    } 
  |  
  |    template <typename T> 
  |    inline T second_derivative(const expression<T>& e, 
  |                               T& x, 
  |                               const T& h = T(0.00001)) 
  |    { 
  |       const T x_init = x; 
  |       const T _2h    = T(2) * h; 
  |  
  |       const T y = e.value(); 
  |       x = x_init + _2h; 
  |       const T y0 = e.value(); 
  |       x = x_init + h; 
  |       const T y1 = e.value(); 
  |       x = x_init - h; 
  |       const T y2 = e.value(); 
  |       x = x_init - _2h; 
  |       const T y3 = e.value(); 
  |       x = x_init; 
  |  
  |       return (-y0 + T(16) * (y1 + y2) - T(30) * y - y3) / (T(12) * h * h); 
  |    } 
  |  
  |    template <typename T> 
  |    inline T third_derivative(const expression<T>& e, 
  |                              T& x, 
  |                              const T& h = T(0.0001)) 
  |    { 
  |       const T x_init = x; 
  |       const T _2h    = T(2) * h; 
  |  
  |       x = x_init + _2h; 
  |       const T y0 = e.value(); 
  |       x = x_init + h; 
  |       const T y1 = e.value(); 
  |       x = x_init - h; 
  |       const T y2 = e.value(); 
  |       x = x_init - _2h; 
  |       const T y3 = e.value(); 
  |       x = x_init; 
  |  
  |       return (y0 + T(2) * (y2 - y1) - y3) / (T(2) * h * h * h); 
  |    } 
  |  
  |    template <typename T> 
  |    inline T derivative(const expression<T>& e, 
  |                        const std::string& variable_name, 
  |                        const T& h = T(0.00000001)) 
  |    { 
  |       const symbol_table<T>& sym_table = e.get_symbol_table(); 
  |  
  |       if (!sym_table.valid()) 
  |       { 
  |          return std::numeric_limits<T>::quiet_NaN(); 
  |       } 
  |  
  |       details::variable_node<T>* var = sym_table.get_variable(variable_name); 
  |  
  |       if (var) 
  |       { 
  |          T& x = var->ref(); 
  |          const T x_original = x; 
  |          const T result = derivative(e, x, h); 
  |          x = x_original; 
  |  
  |          return result; 
  |       } 
  |  
  |       return std::numeric_limits<T>::quiet_NaN(); 
  |    } 
  |  
  |    template <typename T> 
  |    inline T second_derivative(const expression<T>& e, 
  |                               const std::string& variable_name, 
  |                               const T& h = T(0.00001)) 
  |    { 
  |       const symbol_table<T>& sym_table = e.get_symbol_table(); 
  |  
  |       if (!sym_table.valid()) 
  |       { 
  |          return std::numeric_limits<T>::quiet_NaN(); 
  |       } 
  |  
  |       details::variable_node<T>* var = sym_table.get_variable(variable_name); 
  |  
  |       if (var) 
  |       { 
  |          T& x = var->ref(); 
  |          const T x_original = x; 
  |          const T result = second_derivative(e, x, h); 
  |          x = x_original; 
  |  
  |          return result; 
  |       } 
  |  
  |       return std::numeric_limits<T>::quiet_NaN(); 
  |    } 
  |  
  |    template <typename T> 
  |    inline T third_derivative(const expression<T>& e, 
  |                              const std::string& variable_name, 
  |                              const T& h = T(0.0001)) 
  |    { 
  |       const symbol_table<T>& sym_table = e.get_symbol_table(); 
  |  
  |       if (!sym_table.valid()) 
  |       { 
  |          return std::numeric_limits<T>::quiet_NaN(); 
  |       } 
  |  
  |       details::variable_node<T>* var = sym_table.get_variable(variable_name); 
  |  
  |       if (var) 
  |       { 
  |          T& x = var->ref(); 
  |          const T x_original = x; 
  |          const T result = third_derivative(e, x, h); 
  |          x = x_original; 
  |  
  |          return result; 
  |       } 
  |  
  |       return std::numeric_limits<T>::quiet_NaN(); 
  |    } 
  |  
  |    /* 
  |       Note: The following 'compute' routines are simple helpers, 
  |       for quickly setting up the required pieces of code in order 
  |       to evaluate an expression. By virtue of how they operate 
  |       there will be an overhead with regards to their setup and 
  |       teardown and hence should not be used in time critical 
  |       sections of code. 
  |       Furthermore they only assume a small sub set of variables, 
  |       no string variables or user defined functions. 
  |    */ 
  |    template <typename T> 
  |    inline bool compute(const std::string& expression_string, T& result) 
  |    { 
  |       // No variables 
  |       symbol_table<T> symbol_table; 
  |       symbol_table.add_constants(); 
  |  
  |       expression<T> expression; 
  |       expression.register_symbol_table(symbol_table); 
  |  
  |       parser<T> parser; 
  |  
  |       if (parser.compile(expression_string,expression)) 
  |       { 
  |          result = expression.value(); 
  |  
  |          return true; 
  |       } 
  |       else 
  |          return false; 
  |    } 
  |  
  |    template <typename T> 
  |    inline bool compute(const std::string& expression_string, 
  |                        const T& x, 
  |                        T& result) 
  |    { 
  |       // Only 'x' 
  |       static const std::string x_var("x"); 
  |  
  |       symbol_table<T> symbol_table; 
  |       symbol_table.add_constants(); 
  |       symbol_table.add_constant(x_var,x); 
  |  
  |       expression<T> expression; 
  |       expression.register_symbol_table(symbol_table); 
  |  
  |       parser<T> parser; 
  |  
  |       if (parser.compile(expression_string,expression)) 
  |       { 
  |          result = expression.value(); 
  |  
  |          return true; 
  |       } 
  |       else 
  |          return false; 
  |    } 
  |  
  |    template <typename T> 
  |    inline bool compute(const std::string& expression_string, 
  |                        const T&x, const T& y, 
  |                        T& result) 
  |    { 
  |       // Only 'x' and 'y' 
  |       static const std::string x_var("x"); 
  |       static const std::string y_var("y"); 
  |  
  |       symbol_table<T> symbol_table; 
  |       symbol_table.add_constants(); 
  |       symbol_table.add_constant(x_var,x); 
  |       symbol_table.add_constant(y_var,y); 
  |  
  |       expression<T> expression; 
  |       expression.register_symbol_table(symbol_table); 
  |  
  |       parser<T> parser; 
  |  
  |       if (parser.compile(expression_string,expression)) 
  |       { 
  |          result = expression.value(); 
  |  
  |          return true; 
  |       } 
  |       else 
  |          return false; 
  |    } 
  |  
  |    template <typename T> 
  |    inline bool compute(const std::string& expression_string, 
  |                        const T& x, const T& y, const T& z, 
  |                        T& result) 
  |    { 
  |       // Only 'x', 'y' or 'z' 
  |       static const std::string x_var("x"); 
  |       static const std::string y_var("y"); 
  |       static const std::string z_var("z"); 
  |  
  |       symbol_table<T> symbol_table; 
  |       symbol_table.add_constants(); 
  |       symbol_table.add_constant(x_var,x); 
  |       symbol_table.add_constant(y_var,y); 
  |       symbol_table.add_constant(z_var,z); 
  |  
  |       expression<T> expression; 
  |       expression.register_symbol_table(symbol_table); 
  |  
  |       parser<T> parser; 
  |  
  |       if (parser.compile(expression_string,expression)) 
  |       { 
  |          result = expression.value(); 
  |  
  |          return true; 
  |       } 
  |       else 
  |          return false; 
  |    } 
  |  
  |    template <typename T, std::size_t N> 
  |    class polynomial : public ifunction<T> 
  |    { 
  |    private: 
  |  
  |       template <typename Type, std::size_t NumberOfCoefficients> 
  |       struct poly_impl { }; 
  |  
  |       template <typename Type> 
  |       struct poly_impl <Type,12> 
  |       { 
  |          static inline T evaluate(const Type x, 
  |                                   const Type c12, const Type c11, const Type c10, const Type c9, const Type c8, 
  |                                   const Type  c7, const Type  c6, const Type  c5, const Type c4, const Type c3, 
  |                                   const Type  c2, const Type  c1, const Type  c0) 
  |          { 
  |             // p(x) = c_12x^12 + c_11x^11 + c_10x^10 + c_9x^9 + c_8x^8 + c_7x^7 + c_6x^6 + c_5x^5 + c_4x^4 + c_3x^3 + c_2x^2 + c_1x^1 + c_0x^0 
  |             return ((((((((((((c12 * x + c11) * x + c10) * x + c9) * x + c8) * x + c7) * x + c6) * x + c5) * x + c4) * x + c3) * x + c2) * x + c1) * x + c0); 
  |          } 
  |       }; 
  |  
  |       template <typename Type> 
  |       struct poly_impl <Type,11> 
  |       { 
  |          static inline T evaluate(const Type x, 
  |                                   const Type c11, const Type c10, const Type c9, const Type c8, const Type c7, 
  |                                   const Type c6,  const Type  c5, const Type c4, const Type c3, const Type c2, 
  |                                   const Type c1,  const Type  c0) 
  |          { 
  |             // p(x) = c_11x^11 + c_10x^10 + c_9x^9 + c_8x^8 + c_7x^7 + c_6x^6 + c_5x^5 + c_4x^4 + c_3x^3 + c_2x^2 + c_1x^1 + c_0x^0 
  |             return (((((((((((c11 * x + c10) * x + c9) * x + c8) * x + c7) * x + c6) * x + c5) * x + c4) * x + c3) * x + c2) * x + c1) * x + c0); 
  |          } 
  |       }; 
  |  
  |       template <typename Type> 
  |       struct poly_impl <Type,10> 
  |       { 
  |          static inline T evaluate(const Type x, 
  |                                   const Type c10, const Type c9, const Type c8, const Type c7, const Type c6, 
  |                                   const Type c5,  const Type c4, const Type c3, const Type c2, const Type c1, 
  |                                   const Type c0) 
  |          { 
  |             // p(x) = c_10x^10 + c_9x^9 + c_8x^8 + c_7x^7 + c_6x^6 + c_5x^5 + c_4x^4 + c_3x^3 + c_2x^2 + c_1x^1 + c_0x^0 
  |             return ((((((((((c10 * x + c9) * x + c8) * x + c7) * x + c6) * x + c5) * x + c4) * x + c3) * x + c2) * x + c1) * x + c0); 
  |          } 
  |       }; 
  |  
  |       template <typename Type> 
  |       struct poly_impl <Type,9> 
  |       { 
  |          static inline T evaluate(const Type x, 
  |                                   const Type c9, const Type c8, const Type c7, const Type c6, const Type c5, 
  |                                   const Type c4, const Type c3, const Type c2, const Type c1, const Type c0) 
  |          { 
  |             // p(x) = c_9x^9 + c_8x^8 + c_7x^7 + c_6x^6 + c_5x^5 + c_4x^4 + c_3x^3 + c_2x^2 + c_1x^1 + c_0x^0 
  |             return (((((((((c9 * x + c8) * x + c7) * x + c6) * x + c5) * x + c4) * x + c3) * x + c2) * x + c1) * x + c0); 
  |          } 
  |       }; 
  |  
  |       template <typename Type> 
  |       struct poly_impl <Type,8> 
  |       { 
  |          static inline T evaluate(const Type x, 
  |                                   const Type c8, const Type c7, const Type c6, const Type c5, const Type c4, 
  |                                   const Type c3, const Type c2, const Type c1, const Type c0) 
  |          { 
  |             // p(x) = c_8x^8 + c_7x^7 + c_6x^6 + c_5x^5 + c_4x^4 + c_3x^3 + c_2x^2 + c_1x^1 + c_0x^0 
  |             return ((((((((c8 * x + c7) * x + c6) * x + c5) * x + c4) * x + c3) * x + c2) * x + c1) * x + c0); 
  |          } 
  |       }; 
  |  
  |       template <typename Type> 
  |       struct poly_impl <Type,7> 
  |       { 
  |          static inline T evaluate(const Type x, 
  |                                   const Type c7, const Type c6, const Type c5, const Type c4, const Type c3, 
  |                                   const Type c2, const Type c1, const Type c0) 
  |          { 
  |             // p(x) = c_7x^7 + c_6x^6 + c_5x^5 + c_4x^4 + c_3x^3 + c_2x^2 + c_1x^1 + c_0x^0 
  |             return (((((((c7 * x + c6) * x + c5) * x + c4) * x + c3) * x + c2) * x + c1) * x + c0); 
  |          } 
  |       }; 
  |  
  |       template <typename Type> 
  |       struct poly_impl <Type,6> 
  |       { 
  |          static inline T evaluate(const Type x, 
  |                                   const Type c6, const Type c5, const Type c4, const Type c3, const Type c2, 
  |                                   const Type c1, const Type c0) 
  |          { 
  |             // p(x) = c_6x^6 + c_5x^5 + c_4x^4 + c_3x^3 + c_2x^2 + c_1x^1 + c_0x^0 
  |             return ((((((c6 * x + c5) * x + c4) * x + c3) * x + c2) * x + c1) * x + c0); 
  |          } 
  |       }; 
  |  
  |       template <typename Type> 
  |       struct poly_impl <Type,5> 
  |       { 
  |          static inline T evaluate(const Type x, 
  |                                   const Type c5, const Type c4, const Type c3, const Type c2, 
  |                                   const Type c1, const Type c0) 
  |          { 
  |             // p(x) = c_5x^5 + c_4x^4 + c_3x^3 + c_2x^2 + c_1x^1 + c_0x^0 
  |             return (((((c5 * x + c4) * x + c3) * x + c2) * x + c1) * x + c0); 
  |          } 
  |       }; 
  |  
  |       template <typename Type> 
  |       struct poly_impl <Type,4> 
  |       { 
  |          static inline T evaluate(const Type x, const Type c4, const Type c3, const Type c2, const Type c1, const Type c0) 
  |          { 
  |             // p(x) = c_4x^4 + c_3x^3 + c_2x^2 + c_1x^1 + c_0x^0 
  |             return ((((c4 * x + c3) * x + c2) * x + c1) * x + c0); 
  |          } 
  |       }; 
  |  
  |       template <typename Type> 
  |       struct poly_impl <Type,3> 
  |       { 
  |          static inline T evaluate(const Type x, const Type c3, const Type c2, const Type c1, const Type c0) 
  |          { 
  |             // p(x) = c_3x^3 + c_2x^2 + c_1x^1 + c_0x^0 
  |             return (((c3 * x + c2) * x + c1) * x + c0); 
  |          } 
  |       }; 
  |  
  |       template <typename Type> 
  |       struct poly_impl <Type,2> 
  |       { 
  |          static inline T evaluate(const Type x, const Type c2, const Type c1, const Type c0) 
  |          { 
  |             // p(x) = c_2x^2 + c_1x^1 + c_0x^0 
  |             return ((c2 * x + c1) * x + c0); 
  |          } 
  |       }; 
  |  
  |       template <typename Type> 
  |       struct poly_impl <Type,1> 
  |       { 
  |          static inline T evaluate(const Type x, const Type c1, const Type c0) 
  |          { 
  |             // p(x) = c_1x^1 + c_0x^0 
  |             return (c1 * x + c0); 
  |          } 
  |       }; 
  |  
  |    public: 
  |  
  |       using ifunction<T>::operator(); 
  |  
  |       polynomial() 
  |       : ifunction<T>((N+2 <= 20) ? (N + 2) : std::numeric_limits<std::size_t>::max()) 
  |       { 
  |          disable_has_side_effects(*this); 
  |       } 
  |  
  |       virtual ~polynomial() 
  |       {} 
  |  
  |       #define poly_rtrn(NN) \ 
  |       return (NN != N) ? std::numeric_limits<T>::quiet_NaN() : 
  |  
  |       inline virtual T operator() (const T& x, const T& c1, const T& c0) exprtk_override 
  |       { 
  |          poly_rtrn(1) (poly_impl<T,1>::evaluate(x, c1, c0)); 
  |       } 
  |  
  |       inline virtual T operator() (const T& x, const T& c2, const T& c1, const T& c0) exprtk_override 
  |       { 
  |          poly_rtrn(2) (poly_impl<T,2>::evaluate(x, c2, c1, c0)); 
  |       } 
  |  
  |       inline virtual T operator() (const T& x, const T& c3, const T& c2, const T& c1, const T& c0) exprtk_override 
  |       { 
  |          poly_rtrn(3) (poly_impl<T,3>::evaluate(x, c3, c2, c1, c0)); 
  |       } 
  |  
  |       inline virtual T operator() (const T& x, const T& c4, const T& c3, const T& c2, const T& c1, 
  |                                    const T& c0) exprtk_override 
  |       { 
  |          poly_rtrn(4) (poly_impl<T,4>::evaluate(x, c4, c3, c2, c1, c0)); 
  |       } 
  |  
  |       inline virtual T operator() (const T& x, const T& c5, const T& c4, const T& c3, const T& c2, 
  |                                    const T& c1, const T& c0) exprtk_override 
  |       { 
  |          poly_rtrn(5) (poly_impl<T,5>::evaluate(x, c5, c4, c3, c2, c1, c0)); 
  |       } 
  |  
  |       inline virtual T operator() (const T& x, const T& c6, const T& c5, const T& c4, const T& c3, 
  |                                    const T& c2, const T& c1, const T& c0) exprtk_override 
  |       { 
  |          poly_rtrn(6) (poly_impl<T,6>::evaluate(x, c6, c5, c4, c3, c2, c1, c0)); 
  |       } 
  |  
  |       inline virtual T operator() (const T& x, const T& c7, const T& c6, const T& c5, const T& c4, 
  |                                    const T& c3, const T& c2, const T& c1, const T& c0) exprtk_override 
  |       { 
  |          poly_rtrn(7) (poly_impl<T,7>::evaluate(x, c7, c6, c5, c4, c3, c2, c1, c0)); 
  |       } 
  |  
  |       inline virtual T operator() (const T& x, const T& c8, const T& c7, const T& c6, const T& c5, 
  |                                    const T& c4, const T& c3, const T& c2, const T& c1, const T& c0) exprtk_override 
  |       { 
  |          poly_rtrn(8) (poly_impl<T,8>::evaluate(x, c8, c7, c6, c5, c4, c3, c2, c1, c0)); 
  |       } 
  |  
  |       inline virtual T operator() (const T& x, const T& c9, const T& c8, const T& c7, const T& c6, 
  |                                    const T& c5, const T& c4, const T& c3, const T& c2, const T& c1, 
  |                                    const T& c0) exprtk_override 
  |       { 
  |          poly_rtrn(9) (poly_impl<T,9>::evaluate(x, c9, c8, c7, c6, c5, c4, c3, c2, c1, c0)); 
  |       } 
  |  
  |       inline virtual T operator() (const T& x, const T& c10, const T& c9, const T& c8, const T& c7, 
  |                                    const T& c6, const T& c5, const T& c4, const T& c3, const T& c2, 
  |                                    const T& c1, const T& c0) exprtk_override 
  |       { 
  |          poly_rtrn(10) (poly_impl<T,10>::evaluate(x, c10, c9, c8, c7, c6, c5, c4, c3, c2, c1, c0)); 
  |       } 
  |  
  |       inline virtual T operator() (const T& x, const T& c11, const T& c10, const T& c9, const T& c8, 
  |                                    const T& c7, const T& c6, const T& c5, const T& c4, const T& c3, 
  |                                    const T& c2, const T& c1, const T& c0) exprtk_override 
  |       { 
  |          poly_rtrn(11) (poly_impl<T,11>::evaluate(x, c11, c10, c9, c8, c7, c6, c5, c4, c3, c2, c1, c0)); 
  |       } 
  |  
  |       inline virtual T operator() (const T& x, const T& c12, const T& c11, const T& c10, const T& c9, 
  |                                    const T& c8, const T& c7, const T& c6, const T& c5, const T& c4, 
  |                                    const T& c3, const T& c2, const T& c1, const T& c0) exprtk_override 
  |       { 
  |          poly_rtrn(12) (poly_impl<T,12>::evaluate(x, c12, c11, c10, c9, c8, c7, c6, c5, c4, c3, c2, c1, c0)); 
  |       } 
  |  
  |       #undef poly_rtrn 
  |  
  |       inline virtual T operator() () exprtk_override 
  |       { 
  |          return std::numeric_limits<T>::quiet_NaN(); 
  |       } 
  |  
  |       inline virtual T operator() (const T&) exprtk_override 
  |       { 
  |          return std::numeric_limits<T>::quiet_NaN(); 
  |       } 
  |  
  |       inline virtual T operator() (const T&, const T&) exprtk_override 
  |       { 
  |          return std::numeric_limits<T>::quiet_NaN(); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class function_compositor 
  |    { 
  |    public: 
  |  
  |       typedef exprtk::expression<T>             expression_t; 
  |       typedef exprtk::symbol_table<T>           symbol_table_t; 
  |       typedef exprtk::parser<T>                 parser_t; 
  |       typedef typename parser_t::settings_store settings_t; 
  |  
  |       struct function 
  |       { 
  |          function() 
  |          {} 
  |  
  |          function(const std::string& n) 
  |          : name_(n) 
  |          {} 
  |  
  |          function(const std::string& name, 
  |                   const std::string& expression) 
  |          : name_(name) 
  |          , expression_(expression) 
  |          {} 
  |  
  |          function(const std::string& name, 
  |                   const std::string& expression, 
  |                   const std::string& v0) 
  |          : name_(name) 
  |          , expression_(expression) 
  |          { 
  |             v_.push_back(v0); 
  |          } 
  |  
  |          function(const std::string& name, 
  |                   const std::string& expression, 
  |                   const std::string& v0, const std::string& v1) 
  |          : name_(name) 
  |          , expression_(expression) 
  |          { 
  |             v_.push_back(v0); v_.push_back(v1); 
  |          } 
  |  
  |          function(const std::string& name, 
  |                   const std::string& expression, 
  |                   const std::string& v0, const std::string& v1, 
  |                   const std::string& v2) 
  |          : name_(name) 
  |          , expression_(expression) 
  |          { 
  |             v_.push_back(v0); v_.push_back(v1); 
  |             v_.push_back(v2); 
  |          } 
  |  
  |          function(const std::string& name, 
  |                   const std::string& expression, 
  |                   const std::string& v0, const std::string& v1, 
  |                   const std::string& v2, const std::string& v3) 
  |          : name_(name) 
  |          , expression_(expression) 
  |          { 
  |             v_.push_back(v0); v_.push_back(v1); 
  |             v_.push_back(v2); v_.push_back(v3); 
  |          } 
  |  
  |          function(const std::string& name, 
  |                   const std::string& expression, 
  |                   const std::string& v0, const std::string& v1, 
  |                   const std::string& v2, const std::string& v3, 
  |                   const std::string& v4) 
  |          : name_(name) 
  |          , expression_(expression) 
  |          { 
  |             v_.push_back(v0); v_.push_back(v1); 
  |             v_.push_back(v2); v_.push_back(v3); 
  |             v_.push_back(v4); 
  |          } 
  |  
  |          inline function& name(const std::string& n) 
  |          { 
  |             name_ = n; 
  |             return (*this); 
  |          } 
  |  
  |          inline function& expression(const std::string& e) 
  |          { 
  |             expression_ = e; 
  |             return (*this); 
  |          } 
  |  
  |          inline function& var(const std::string& v) 
  |          { 
  |             v_.push_back(v); 
  |             return (*this); 
  |          } 
  |  
  |          inline function& vars(const std::string& v0, 
  |                                const std::string& v1) 
  |          { 
  |             v_.push_back(v0); 
  |             v_.push_back(v1); 
  |             return (*this); 
  |          } 
  |  
  |          inline function& vars(const std::string& v0, 
  |                                const std::string& v1, 
  |                                const std::string& v2) 
  |          { 
  |             v_.push_back(v0); 
  |             v_.push_back(v1); 
  |             v_.push_back(v2); 
  |             return (*this); 
  |          } 
  |  
  |          inline function& vars(const std::string& v0, 
  |                                const std::string& v1, 
  |                                const std::string& v2, 
  |                                const std::string& v3) 
  |          { 
  |             v_.push_back(v0); 
  |             v_.push_back(v1); 
  |             v_.push_back(v2); 
  |             v_.push_back(v3); 
  |             return (*this); 
  |          } 
  |  
  |          inline function& vars(const std::string& v0, 
  |                                const std::string& v1, 
  |                                const std::string& v2, 
  |                                const std::string& v3, 
  |                                const std::string& v4) 
  |          { 
  |             v_.push_back(v0); 
  |             v_.push_back(v1); 
  |             v_.push_back(v2); 
  |             v_.push_back(v3); 
  |             v_.push_back(v4); 
  |             return (*this); 
  |          } 
  |  
  |          std::string name_; 
  |          std::string expression_; 
  |          std::deque<std::string> v_; 
  |       }; 
  |  
  |    private: 
  |  
  |       struct base_func : public exprtk::ifunction<T> 
  |       { 
  |          typedef const T&                  type; 
  |          typedef exprtk::ifunction<T>      function_t; 
  |          typedef std::vector<T*>           varref_t; 
  |          typedef std::vector<T>            var_t; 
  |          typedef std::vector<std::string>  str_t; 
  |          typedef std::pair<T*,std::size_t> lvarref_t; 
  |          typedef std::vector<lvarref_t>    lvr_vec_t; 
  |          typedef std::vector<std::string*> lstr_vec_t; 
  |  
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          base_func(const std::size_t& pc = 0) 
  |          : exprtk::ifunction<T>(pc) 
  |          , local_var_stack_size(0) 
  |          , stack_depth(0) 
  |          { 
  |             v.resize(pc); 
  |          } 
  |  
  |          virtual ~base_func() 
  |          {} 
  |  
  |          #define exprtk_assign(Index) \ 
  |          (*v[Index]) = v##Index;      \ 
  |  
  |          inline void update(const T& v0) 
  |          { 
  |             exprtk_assign(0) 
  |          } 
  |  
  |          inline void update(const T& v0, const T& v1) 
  |          { 
  |             exprtk_assign(0) exprtk_assign(1) 
  |          } 
  |  
  |          inline void update(const T& v0, const T& v1, const T& v2) 
  |          { 
  |             exprtk_assign(0) exprtk_assign(1) 
  |             exprtk_assign(2) 
  |          } 
  |  
  |          inline void update(const T& v0, const T& v1, const T& v2, const T& v3) 
  |          { 
  |             exprtk_assign(0) exprtk_assign(1) 
  |             exprtk_assign(2) exprtk_assign(3) 
  |          } 
  |  
  |          inline void update(const T& v0, const T& v1, const T& v2, const T& v3, const T& v4) 
  |          { 
  |             exprtk_assign(0) exprtk_assign(1) 
  |             exprtk_assign(2) exprtk_assign(3) 
  |             exprtk_assign(4) 
  |          } 
  |  
  |          inline void update(const T& v0, const T& v1, const T& v2, const T& v3, const T& v4, const T& v5) 
  |          { 
  |             exprtk_assign(0) exprtk_assign(1) 
  |             exprtk_assign(2) exprtk_assign(3) 
  |             exprtk_assign(4) exprtk_assign(5) 
  |          } 
  |  
  |          #ifdef exprtk_assign 
  |          #undef exprtk_assign 
  |          #endif 
  |  
  |          inline function_t& setup(expression_t& expr) 
  |          { 
  |             expression = expr; 
  |  
  |             typedef typename expression_t::control_block  ctrlblk_t; 
  |             typedef typename ctrlblk_t::local_data_list_t ldl_t; 
  |             typedef typename ctrlblk_t::data_type         data_t; 
  |             typedef typename ldl_t::value_type            ldl_value_type; 
  |  
  |             const ldl_t ldl = expr.local_data_list(); 
  |  
  |             std::vector<std::pair<std::size_t,data_t> > index_list; 
  |  
  |             for (std::size_t i = 0; i < ldl.size(); ++i) 
  |             { 
  |                exprtk_debug(("base_func::setup() - element[%02d] type: %s size: %d\n", 
  |                              static_cast<int>(i), 
  |                              expression_t::control_block::to_str(ldl[i].type).c_str(), 
  |                              static_cast<int>(ldl[i].size))); 
  |  
  |                switch (ldl[i].type) 
  |                { 
  |                   case ctrlblk_t::e_unknown   : continue; 
  |                   case ctrlblk_t::e_expr      : continue; 
  |                   case ctrlblk_t::e_vecholder : continue; 
  |                   default                     : break; 
  |                } 
  |  
  |                if (ldl[i].size) 
  |                { 
  |                   index_list.push_back(std::make_pair(i,ldl[i].type)); 
  |                } 
  |             } 
  |  
  |             std::size_t input_param_count = 0; 
  |  
  |             for (std::size_t i = 0; i < index_list.size(); ++i) 
  |             { 
  |                const std::size_t index         = index_list[i].first; 
  |                const ldl_value_type& local_var = ldl[index]; 
  |  
  |                assert(local_var.pointer); 
  |  
  |                if (i < (index_list.size() - v.size())) 
  |                { 
  |                   if (local_var.type == ctrlblk_t::e_string) 
  |                   { 
  |                      local_str_vars.push_back( 
  |                         reinterpret_cast<std::string*>(local_var.pointer)); 
  |                   } 
  |                   else if ( 
  |                             (local_var.type == ctrlblk_t::e_data   ) || 
  |                             (local_var.type == ctrlblk_t::e_vecdata) 
  |                           ) 
  |                   { 
  |                      local_vars.push_back(std::make_pair( 
  |                         reinterpret_cast<T*>(local_var.pointer), 
  |                         local_var.size)); 
  |  
  |                      local_var_stack_size += local_var.size; 
  |                   } 
  |                } 
  |                else 
  |                { 
  |                   v[input_param_count++] = reinterpret_cast<T*>(local_var.pointer); 
  |                } 
  |             } 
  |  
  |             clear_stack(); 
  |  
  |             return (*this); 
  |          } 
  |  
  |          inline void pre() 
  |          { 
  |             if (stack_depth++) 
  |             { 
  |                if (!v.empty()) 
  |                { 
  |                   var_t var_stack(v.size(),T(0)); 
  |                   copy(v,var_stack); 
  |                   input_params_stack.push_back(var_stack); 
  |                } 
  |  
  |                if (!local_vars.empty()) 
  |                { 
  |                   var_t local_vec_frame(local_var_stack_size,T(0)); 
  |                   copy(local_vars,local_vec_frame); 
  |                   local_var_stack.push_back(local_vec_frame); 
  |                } 
  |  
  |                if (!local_str_vars.empty()) 
  |                { 
  |                   str_t local_str_frame(local_str_vars.size()); 
  |                   copy(local_str_vars,local_str_frame); 
  |                   local_str_stack.push_back(local_str_frame); 
  |                } 
  |             } 
  |          } 
  |  
  |          inline void post() 
  |          { 
  |             if (--stack_depth) 
  |             { 
  |                if (!v.empty()) 
  |                { 
  |                   copy(input_params_stack.back(), v); 
  |                   input_params_stack.pop_back(); 
  |                } 
  |  
  |                if (!local_vars.empty()) 
  |                { 
  |                   copy(local_var_stack.back(), local_vars); 
  |                   local_var_stack.pop_back(); 
  |                } 
  |  
  |                if (!local_str_vars.empty()) 
  |                { 
  |                   copy(local_str_stack.back(), local_str_vars); 
  |                   local_str_stack.pop_back(); 
  |                } 
  |             } 
  |          } 
  |  
  |          void copy(const varref_t& src_v, var_t& dest_v) 
  |          { 
  |             for (std::size_t i = 0; i < src_v.size(); ++i) 
  |             { 
  |                dest_v[i] = (*src_v[i]); 
  |             } 
  |          } 
  |  
  |          void copy(const lstr_vec_t& src_v, str_t& dest_v) 
  |          { 
  |             for (std::size_t i = 0; i < src_v.size(); ++i) 
  |             { 
  |                dest_v[i] = (*src_v[i]); 
  |             } 
  |          } 
  |  
  |          void copy(const var_t& src_v, varref_t& dest_v) 
  |          { 
  |             for (std::size_t i = 0; i < src_v.size(); ++i) 
  |             { 
  |                (*dest_v[i]) = src_v[i]; 
  |             } 
  |          } 
  |  
  |          void copy(const lvr_vec_t& src_v, var_t& dest_v) 
  |          { 
  |             typename var_t::iterator itr = dest_v.begin(); 
  |             typedef  typename std::iterator_traits<typename var_t::iterator>::difference_type diff_t; 
  |  
  |             for (std::size_t i = 0; i < src_v.size(); ++i) 
  |             { 
  |                lvarref_t vr = src_v[i]; 
  |  
  |                if (1 == vr.second) 
  |                   *itr++ = (*vr.first); 
  |                else 
  |                { 
  |                   std::copy(vr.first, vr.first + vr.second, itr); 
  |                   itr += static_cast<diff_t>(vr.second); 
  |                } 
  |             } 
  |          } 
  |  
  |          void copy(const var_t& src_v, lvr_vec_t& dest_v) 
  |          { 
  |             typename var_t::const_iterator itr = src_v.begin(); 
  |             typedef  typename std::iterator_traits<typename var_t::iterator>::difference_type diff_t; 
  |  
  |             for (std::size_t i = 0; i < dest_v.size(); ++i) 
  |             { 
  |                lvarref_t& vr = dest_v[i]; 
  |  
  |                assert(vr.first != 0); 
  |                assert(vr.second > 0); 
  |  
  |                if (1 == vr.second) 
  |                   (*vr.first) = *itr++; 
  |                else 
  |                { 
  |                   std::copy(itr, itr + static_cast<diff_t>(vr.second), vr.first); 
  |                   itr += static_cast<diff_t>(vr.second); 
  |                } 
  |             } 
  |          } 
  |  
  |          void copy(const str_t& src_str, lstr_vec_t& dest_str) 
  |          { 
  |             assert(src_str.size() == dest_str.size()); 
  |  
  |             for (std::size_t i = 0; i < dest_str.size(); ++i) 
  |             { 
  |                *dest_str[i] = src_str[i]; 
  |             } 
  |          } 
  |  
  |          inline void clear_stack() 
  |          { 
  |             for (std::size_t i = 0; i < v.size(); ++i) 
  |             { 
  |                (*v[i]) = 0; 
  |             } 
  |          } 
  |  
  |          inline virtual T value(expression_t& e) 
  |          { 
  |             return e.value(); 
  |          } 
  |  
  |          expression_t      expression; 
  |          varref_t          v; 
  |          lvr_vec_t         local_vars; 
  |          lstr_vec_t        local_str_vars; 
  |          std::size_t       local_var_stack_size; 
  |          std::size_t       stack_depth; 
  |          std::deque<var_t> input_params_stack; 
  |          std::deque<var_t> local_var_stack; 
  |          std::deque<str_t> local_str_stack; 
  |       }; 
  |  
  |       typedef std::map<std::string,base_func*> funcparam_t; 
  |  
  |       typedef const T& type; 
  |  
  |       template <typename BaseFuncType> 
  |       struct scoped_bft 
  |       { 
  |          explicit scoped_bft(BaseFuncType& bft) 
  |          : bft_(bft) 
  |          { 
  |             bft_.pre (); 
  |          } 
  |  
  |         ~scoped_bft() 
  |          { 
  |             bft_.post(); 
  |          } 
  |  
  |          BaseFuncType& bft_; 
  |  
  |       private: 
  |  
  |          scoped_bft(const scoped_bft&) exprtk_delete; 
  |          scoped_bft& operator=(const scoped_bft&) exprtk_delete; 
  |       }; 
  |  
  |       struct func_0param : public base_func 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          func_0param() : base_func(0) {} 
  |  
  |          inline T operator() () exprtk_override 
  |          { 
  |             scoped_bft<func_0param> sb(*this); 
  |             return this->value(base_func::expression); 
  |          } 
  |       }; 
  |  
  |       struct func_1param : public base_func 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          func_1param() : base_func(1) {} 
  |  
  |          inline T operator() (type v0) exprtk_override 
  |          { 
  |             scoped_bft<func_1param> sb(*this); 
  |             base_func::update(v0); 
  |             return this->value(base_func::expression); 
  |          } 
  |       }; 
  |  
  |       struct func_2param : public base_func 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          func_2param() : base_func(2) {} 
  |  
  |          inline T operator() (type v0, type v1) exprtk_override 
  |          { 
  |             scoped_bft<func_2param> sb(*this); 
  |             base_func::update(v0, v1); 
  |             return this->value(base_func::expression); 
  |          } 
  |       }; 
  |  
  |       struct func_3param : public base_func 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          func_3param() : base_func(3) {} 
  |  
  |          inline T operator() (type v0, type v1, type v2) exprtk_override 
  |          { 
  |             scoped_bft<func_3param> sb(*this); 
  |             base_func::update(v0, v1, v2); 
  |             return this->value(base_func::expression); 
  |          } 
  |       }; 
  |  
  |       struct func_4param : public base_func 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          func_4param() : base_func(4) {} 
  |  
  |          inline T operator() (type v0, type v1, type v2, type v3) exprtk_override 
  |          { 
  |             scoped_bft<func_4param> sb(*this); 
  |             base_func::update(v0, v1, v2, v3); 
  |             return this->value(base_func::expression); 
  |          } 
  |       }; 
  |  
  |       struct func_5param : public base_func 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          func_5param() : base_func(5) {} 
  |  
  |          inline T operator() (type v0, type v1, type v2, type v3, type v4) exprtk_override 
  |          { 
  |             scoped_bft<func_5param> sb(*this); 
  |             base_func::update(v0, v1, v2, v3, v4); 
  |             return this->value(base_func::expression); 
  |          } 
  |       }; 
  |  
  |       struct func_6param : public base_func 
  |       { 
  |          using exprtk::ifunction<T>::operator(); 
  |  
  |          func_6param() : base_func(6) {} 
  |  
  |          inline T operator() (type v0, type v1, type v2, type v3, type v4, type v5) exprtk_override 
  |          { 
  |             scoped_bft<func_6param> sb(*this); 
  |             base_func::update(v0, v1, v2, v3, v4, v5); 
  |             return this->value(base_func::expression); 
  |          } 
  |       }; 
  |  
  |       static T return_value(expression_t& e) 
  |       { 
  |          typedef exprtk::results_context<T> results_context_t; 
  |          typedef typename results_context_t::type_store_t type_t; 
  |          typedef typename type_t::scalar_view scalar_t; 
  |  
  |          const T result = e.value(); 
  |  
  |          if (e.return_invoked()) 
  |          { 
  |             // Due to the post compilation checks, it can be safely 
  |             // assumed that there will be at least one parameter 
  |             // and that the first parameter will always be scalar. 
  |             return scalar_t(e.results()[0])(); 
  |          } 
  |  
  |          return result; 
  |       } 
  |  
  |       #define def_fp_retval(N)                                            \ 
  |       struct func_##N##param_retval exprtk_final : public func_##N##param \ 
  |       {                                                                   \ 
  |          inline T value(expression_t& e) exprtk_override                  \ 
  |          {                                                                \ 
  |             return return_value(e);                                       \ 
  |          }                                                                \ 
  |       };                                                                  \ 
  |  
  |       def_fp_retval(0) 
  |       def_fp_retval(1) 
  |       def_fp_retval(2) 
  |       def_fp_retval(3) 
  |       def_fp_retval(4) 
  |       def_fp_retval(5) 
  |       def_fp_retval(6) 
  |  
  |       #undef def_fp_retval 
  |  
  |       template <typename Allocator, 
  |                 template <typename, typename> class Sequence> 
  |       inline bool add(const std::string& name, 
  |                       const std::string& expression, 
  |                       const Sequence<std::string,Allocator>& var_list, 
  |                       const bool override = false) 
  |       { 
  |          const typename std::map<std::string,expression_t>::iterator itr = expr_map_.find(name); 
  |  
  |          if (expr_map_.end() != itr) 
  |          { 
  |             if (!override) 
  |             { 
  |                exprtk_debug(("Compositor error(add): function '%s' already defined\n", 
  |                              name.c_str())); 
  |  
  |                return false; 
  |             } 
  |  
  |             remove(name, var_list.size()); 
  |          } 
  |  
  |          if (compile_expression(name, expression, var_list)) 
  |          { 
  |             const std::size_t n = var_list.size(); 
  |  
  |             fp_map_[n][name]->setup(expr_map_[name]); 
  |  
  |             return true; 
  |          } 
  |          else 
  |          { 
  |             exprtk_debug(("Compositor error(add): Failed to compile function '%s'\n", 
  |                           name.c_str())); 
  |  
  |             return false; 
  |          } 
  |       } 
  |  
  |    public: 
  |  
  |       function_compositor() 
  |       : parser_(settings_t::default_compile_all_opts + 
  |                 settings_t::e_disable_zero_return) 
  |       , fp_map_(7) 
  |       , load_variables_(false) 
  |       , load_vectors_(false) 
  |       {} 
  |  
  |       explicit function_compositor(const symbol_table_t& st) 
  |       : symbol_table_(st) 
  |       , parser_(settings_t::default_compile_all_opts + 
  |                 settings_t::e_disable_zero_return) 
  |       , fp_map_(7) 
  |       , load_variables_(false) 
  |       , load_vectors_(false) 
  |       {} 
  |  
  |      ~function_compositor() 
  |       { 
  |          clear(); 
  |       } 
  |  
  |       inline symbol_table_t& symbol_table() 
  |       { 
  |          return symbol_table_; 
  |       } 
  |  
  |       inline const symbol_table_t& symbol_table() const 
  |       { 
  |          return symbol_table_; 
  |       } 
  |  
  |       inline void add_auxiliary_symtab(symbol_table_t& symtab) 
  |       { 
  |          auxiliary_symtab_list_.push_back(&symtab); 
  |       } 
  |  
  |       void load_variables(const bool load = true) 
  |       { 
  |          load_variables_ = load; 
  |       } 
  |  
  |       void load_vectors(const bool load = true) 
  |       { 
  |          load_vectors_ = load; 
  |       } 
  |  
  |       inline void register_loop_runtime_check(loop_runtime_check& lrtchk) 
  |       { 
  |          parser_.register_loop_runtime_check(lrtchk); 
  |       } 
  |  
  |       inline void register_vector_access_runtime_check(vector_access_runtime_check& vartchk) 
  |       { 
  |          parser_.register_vector_access_runtime_check(vartchk); 
  |       } 
  |  
  |       inline void register_compilation_timeout_check(compilation_check& compchk) 
  |       { 
  |          parser_.register_compilation_timeout_check(compchk); 
  |       } 
  |  
  |       inline void clear_loop_runtime_check() 
  |       { 
  |          parser_.clear_loop_runtime_check(); 
  |       } 
  |  
  |       inline void clear_vector_access_runtime_check() 
  |       { 
  |          parser_.clear_vector_access_runtime_check(); 
  |       } 
  |  
  |       inline void clear_compilation_timeout_check() 
  |       { 
  |          parser_.clear_compilation_timeout_check(); 
  |       } 
  |  
  |       void clear() 
  |       { 
  |          symbol_table_.clear(); 
  |          expr_map_    .clear(); 
  |  
  |          for (std::size_t i = 0; i < fp_map_.size(); ++i) 
  |          { 
  |             typename funcparam_t::iterator itr = fp_map_[i].begin(); 
  |             typename funcparam_t::iterator end = fp_map_[i].end  (); 
  |  
  |             while (itr != end) 
  |             { 
  |                delete itr->second; 
  |                ++itr; 
  |             } 
  |  
  |             fp_map_[i].clear(); 
  |          } 
  |  
  |          clear_loop_runtime_check         (); 
  |          clear_vector_access_runtime_check(); 
  |          clear_compilation_timeout_check  (); 
  |       } 
  |  
  |       inline bool add(const function& f, const bool override = false) 
  |       { 
  |          return add(f.name_, f.expression_, f.v_,override); 
  |       } 
  |  
  |       inline std::string error() const 
  |       { 
  |          if (!error_list_.empty()) 
  |          { 
  |             return error_list_[0].diagnostic; 
  |          } 
  |          else 
  |             return std::string("No Error"); 
  |       } 
  |  
  |       inline std::size_t error_count() const 
  |       { 
  |          return error_list_.size(); 
  |       } 
  |  
  |       inline parser_error::type get_error(const std::size_t& index) const 
  |       { 
  |          if (index < error_list_.size()) 
  |          { 
  |             return error_list_[index]; 
  |          } 
  |  
  |          throw std::invalid_argument("compositor::get_error() - Invalid error index specified"); 
  |       } 
  |  
  |    private: 
  |  
  |       template <typename Allocator, 
  |                 template <typename, typename> class Sequence> 
  |       bool compile_expression(const std::string& name, 
  |                               const std::string& expression, 
  |                               const Sequence<std::string,Allocator>& input_var_list, 
  |                               bool  return_present = false) 
  |       { 
  |          expression_t compiled_expression; 
  |          symbol_table_t local_symbol_table; 
  |  
  |          local_symbol_table.load_from(symbol_table_); 
  |          local_symbol_table.add_constants(); 
  |  
  |          if (load_variables_) 
  |          { 
  |             local_symbol_table.load_variables_from(symbol_table_); 
  |          } 
  |  
  |          if (load_vectors_) 
  |          { 
  |             local_symbol_table.load_vectors_from(symbol_table_); 
  |          } 
  |  
  |          error_list_.clear(); 
  |  
  |          if (!valid(name,input_var_list.size())) 
  |          { 
  |             parser_error::type error = 
  |                parser_error::make_error( 
  |                   parser_error::e_parser, 
  |                   lexer::token(), 
  |                   "ERR277 - Function '" + name + "' is an invalid overload", 
  |                   exprtk_error_location); 
  |  
  |             error_list_.push_back(error); 
  |             return false; 
  |          } 
  |  
  |          if (!forward(name, 
  |                       input_var_list.size(), 
  |                       local_symbol_table, 
  |                       return_present)) 
  |             return false; 
  |  
  |          compiled_expression.register_symbol_table(local_symbol_table); 
  |  
  |          for (std::size_t i = 0; i < auxiliary_symtab_list_.size(); ++i) 
  |          { 
  |             compiled_expression.register_symbol_table((*auxiliary_symtab_list_[i])); 
  |          } 
  |  
  |          std::string mod_expression; 
  |  
  |          for (std::size_t i = 0; i < input_var_list.size(); ++i) 
  |          { 
  |             mod_expression += " var " + input_var_list[i] + "{};\n" 
  |          } 
  |  
  |          if ( 
  |               ('{' == details::front(expression)) && 
  |               ('}' == details::back (expression)) 
  |             ) 
  |             mod_expression += "~" + expression + "" 
  |          else 
  |             mod_expression += "~{" + expression + "};" 
  |  
  |          if (!parser_.compile(mod_expression,compiled_expression)) 
  |          { 
  |             exprtk_debug(("Compositor Error: %s\n", parser_.error().c_str())); 
  |             exprtk_debug(("Compositor modified expression: \n%s\n", mod_expression.c_str())); 
  |  
  |             remove(name,input_var_list.size()); 
  |  
  |             for (std::size_t err_index = 0; err_index < parser_.error_count(); ++err_index) 
  |             { 
  |                error_list_.push_back(parser_.get_error(err_index)); 
  |             } 
  |  
  |             return false; 
  |          } 
  |  
  |          if (!return_present && parser_.dec().return_present()) 
  |          { 
  |             remove(name,input_var_list.size()); 
  |             return compile_expression(name, expression, input_var_list, true); 
  |          } 
  |  
  |          // Make sure every return point has a scalar as its first parameter 
  |          if (parser_.dec().return_present()) 
  |          { 
  |             typedef std::vector<std::string> str_list_t; 
  |  
  |             str_list_t ret_param_list = parser_.dec().return_param_type_list(); 
  |  
  |             for (std::size_t i = 0; i < ret_param_list.size(); ++i) 
  |             { 
  |                const std::string& params = ret_param_list[i]; 
  |  
  |                if (params.empty() || ('T' != params[0])) 
  |                { 
  |                   exprtk_debug(("Compositor Error: Return statement in function '%s' is invalid\n", 
  |                                 name.c_str())); 
  |  
  |                   remove(name,input_var_list.size()); 
  |  
  |                   return false; 
  |                } 
  |             } 
  |          } 
  |  
  |          expr_map_[name] = compiled_expression; 
  |  
  |          exprtk::ifunction<T>& ifunc = (*(fp_map_[input_var_list.size()])[name]); 
  |  
  |          if (symbol_table_.add_function(name,ifunc)) 
  |             return true; 
  |          else 
  |          { 
  |             exprtk_debug(("Compositor Error: Failed to add function '%s' to symbol table\n", 
  |                           name.c_str())); 
  |             return false; 
  |          } 
  |       } 
  |  
  |       inline bool symbol_used(const std::string& symbol) const 
  |       { 
  |          return ( 
  |                   symbol_table_.is_variable       (symbol) || 
  |                   symbol_table_.is_stringvar      (symbol) || 
  |                   symbol_table_.is_function       (symbol) || 
  |                   symbol_table_.is_vector         (symbol) || 
  |                   symbol_table_.is_vararg_function(symbol) 
  |                 ); 
  |       } 
  |  
  |       inline bool valid(const std::string& name, 
  |                         const std::size_t& arg_count) const 
  |       { 
  |          if (arg_count > 6) 
  |             return false; 
  |          else if (symbol_used(name)) 
  |             return false; 
  |          else if (fp_map_[arg_count].end() != fp_map_[arg_count].find(name)) 
  |             return false; 
  |          else 
  |             return true; 
  |       } 
  |  
  |       inline bool forward(const std::string& name, 
  |                           const std::size_t& arg_count, 
  |                           symbol_table_t& sym_table, 
  |                           const bool ret_present = false) 
  |       { 
  |          switch (arg_count) 
  |          { 
  |             #define case_stmt(N)                                     \ 
  |             case N : (fp_map_[arg_count])[name] =                    \ 
  |                      (!ret_present) ? static_cast<base_func*>        \ 
  |                                       (new func_##N##param) :        \ 
  |                                       static_cast<base_func*>        \ 
  |                                       (new func_##N##param_retval) ; \ 
  |                      break;                                          \ 
  |  
  |             case_stmt(0) case_stmt(1) case_stmt(2) 
  |             case_stmt(3) case_stmt(4) case_stmt(5) 
  |             case_stmt(6) 
  |             #undef case_stmt 
  |          } 
  |  
  |          exprtk::ifunction<T>& ifunc = (*(fp_map_[arg_count])[name]); 
  |  
  |          return sym_table.add_function(name,ifunc); 
  |       } 
  |  
  |       inline void remove(const std::string& name, const std::size_t& arg_count) 
  |       { 
  |          if (arg_count > 6) 
  |             return; 
  |  
  |          const typename std::map<std::string,expression_t>::iterator em_itr = expr_map_.find(name); 
  |  
  |          if (expr_map_.end() != em_itr) 
  |          { 
  |             expr_map_.erase(em_itr); 
  |          } 
  |  
  |          const typename funcparam_t::iterator fp_itr = fp_map_[arg_count].find(name); 
  |  
  |          if (fp_map_[arg_count].end() != fp_itr) 
  |          { 
  |             delete fp_itr->second; 
  |             fp_map_[arg_count].erase(fp_itr); 
  |          } 
  |  
  |          symbol_table_.remove_function(name); 
  |       } 
  |  
  |    private: 
  |  
  |       symbol_table_t symbol_table_; 
  |       parser_t parser_; 
  |       std::map<std::string,expression_t> expr_map_; 
  |       std::vector<funcparam_t> fp_map_; 
  |       std::vector<symbol_table_t*> auxiliary_symtab_list_; 
  |       std::deque<parser_error::type> error_list_; 
  |       bool load_variables_; 
  |       bool load_vectors_; 
  |    }; // class function_compositor 
  |  
  | } // namespace exprtk 
  |  
  | #if defined(_MSC_VER) || defined(_WIN32) || defined(__WIN32__) || defined(WIN32) 
  | #   ifndef NOMINMAX 
  | #      define NOMINMAX 
  | #   endif 
  | #   ifndef WIN32_LEAN_AND_MEAN 
  | #      define WIN32_LEAN_AND_MEAN 
  | #   endif 
  | #   include  
  | #   include  
  | #else 
  | #   include  
  | #   include  
  | #   include  
  | #endif 
  |  
  | namespace exprtk 
  | { 
  |    class timer 
  |    { 
  |    public: 
  |  
  |       #if defined(_MSC_VER) || defined(_WIN32) || defined(__WIN32__) || defined(WIN32) 
  |       timer() 
  |       : in_use_(false) 
  |       , start_time_{ {0, 0} } 
  |       , stop_time_ { {0, 0} } 
  |       { 
  |          QueryPerformanceFrequency(&clock_frequency_); 
  |       } 
  |  
  |       inline void start() 
  |       { 
  |          in_use_ = true; 
  |          QueryPerformanceCounter(&start_time_); 
  |       } 
  |  
  |       inline void stop() 
  |       { 
  |          QueryPerformanceCounter(&stop_time_); 
  |          in_use_ = false; 
  |       } 
  |  
  |       inline double time() const 
  |       { 
  |          return (1.0 * (stop_time_.QuadPart - start_time_.QuadPart)) / (1.0 * clock_frequency_.QuadPart); 
  |       } 
  |  
  |       #else 
  |  
  |       timer() 
  |       : in_use_(false) 
  |       { 
  |          start_time_.tv_sec  = 0; 
  |          start_time_.tv_usec = 0; 
  |  
  |          stop_time_.tv_sec   = 0; 
  |          stop_time_.tv_usec  = 0; 
  |       } 
  |  
  |       inline void start() 
  |       { 
  |          in_use_ = true; 
  |          gettimeofday(&start_time_,0); 
  |       } 
  |  
  |       inline void stop() 
  |       { 
  |          gettimeofday(&stop_time_, 0); 
  |          in_use_ = false; 
  |       } 
  |  
  |       inline unsigned long long int usec_time() const 
  |       { 
  |          if (!in_use_) 
  |          { 
  |             if (stop_time_.tv_sec >= start_time_.tv_sec) 
  |             { 
  |                return 1000000LLU * static_cast<details::_uint64_t>(stop_time_.tv_sec  - start_time_.tv_sec ) + 
  |                                    static_cast<details::_uint64_t>(stop_time_.tv_usec - start_time_.tv_usec) ; 
  |             } 
  |             else 
  |                return std::numeric_limits<details::_uint64_t>::max(); 
  |          } 
  |          else 
  |             return std::numeric_limits<details::_uint64_t>::max(); 
  |       } 
  |  
  |       inline double time() const 
  |       { 
  |          return usec_time() * 0.000001; 
  |       } 
  |  
  |       #endif 
  |  
  |       inline bool in_use() const 
  |       { 
  |          return in_use_; 
  |       } 
  |  
  |    private: 
  |  
  |       bool in_use_; 
  |  
  |       #if defined(_MSC_VER) || defined(_WIN32) || defined(__WIN32__) || defined(WIN32) 
  |          LARGE_INTEGER start_time_; 
  |          LARGE_INTEGER stop_time_; 
  |          LARGE_INTEGER clock_frequency_; 
  |       #else 
  |          struct timeval start_time_; 
  |          struct timeval stop_time_; 
  |       #endif 
  |    }; 
  |  
  |    template <typename T> 
  |    struct type_defs 
  |    { 
  |       typedef symbol_table<T>         symbol_table_t; 
  |       typedef expression<T>           expression_t; 
  |       typedef parser<T>               parser_t; 
  |       typedef parser_error::type      error_t; 
  |       typedef function_compositor<T>  compositor_t; 
  |       typedef typename compositor_t::function function_t; 
  |    }; 
  |  
  | } // namespace exprtk 
  |  
  | #ifndef exprtk_disable_rtl_io 
  | namespace exprtk 
  | { 
  |    namespace rtl { namespace io { namespace details 
  |    { 
  |       template <typename T> 
  |       inline void print_type(const std::string& fmt, 
  |                              const T v, 
  |                              exprtk::details::numeric::details::real_type_tag) 
  |       { 
  |          #if defined(__clang__) 
  |             #pragma clang diagnostic push 
  |             #pragma clang diagnostic ignored "-Wformat-nonliteral" 
  |          #elif defined(__GNUC__) || defined(__GNUG__) 
  |             #pragma GCC diagnostic push 
  |             #pragma GCC diagnostic ignored "-Wformat-nonliteral" 
  |          #elif defined(_MSC_VER) 
  |          #endif 
  |  
  |          printf(fmt.c_str(), v); 
  |  
  |          #if defined(__clang__) 
  |             #pragma clang diagnostic pop 
  |          #elif defined(__GNUC__) || defined(__GNUG__) 
  |             #pragma GCC diagnostic pop 
  |          #elif defined(_MSC_VER) 
  |          #endif 
  |       } 
  |  
  |       template <typename T> 
  |       struct print_impl 
  |       { 
  |          typedef typename igeneric_function<T>::generic_type generic_type; 
  |          typedef typename igeneric_function<T>::parameter_list_t parameter_list_t; 
  |          typedef typename generic_type::scalar_view scalar_t; 
  |          typedef typename generic_type::vector_view vector_t; 
  |          typedef typename generic_type::string_view string_t; 
  |          typedef typename exprtk::details::numeric::details::number_type<T>::type num_type; 
  |  
  |          static void process(const std::string& scalar_format, parameter_list_t parameters) 
  |          { 
  |             for (std::size_t i = 0; i < parameters.size(); ++i) 
  |             { 
  |                generic_type& gt = parameters[i]; 
  |  
  |                switch (gt.type) 
  |                { 
  |                   case generic_type::e_scalar : print(scalar_format,scalar_t(gt)); 
  |                                                 break; 
  |  
  |                   case generic_type::e_vector : print(scalar_format,vector_t(gt)); 
  |                                                 break; 
  |  
  |                   case generic_type::e_string : print(string_t(gt)); 
  |                                                 break; 
  |  
  |                   default                     : continue; 
  |                } 
  |             } 
  |          } 
  |  
  |          static inline void print(const std::string& scalar_format, const scalar_t& s) 
  |          { 
  |             print_type(scalar_format,s(),num_type()); 
  |          } 
  |  
  |          static inline void print(const std::string& scalar_format, const vector_t& v) 
  |          { 
  |             for (std::size_t i = 0; i < v.size(); ++i) 
  |             { 
  |                print_type(scalar_format,v[i],num_type()); 
  |  
  |                if ((i + 1) < v.size()) 
  |                   printf(" "); 
  |             } 
  |          } 
  |  
  |          static inline void print(const string_t& s) 
  |          { 
  |             printf("%s",to_str(s).c_str()); 
  |          } 
  |       }; 
  |  
  |    } // namespace exprtk::rtl::io::details 
  |  
  |    template <typename T> 
  |    struct print exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |       typedef typename igeneric_function<T>::parameter_list_t parameter_list_t; 
  |  
  |       using exprtk::igeneric_function<T>::operator(); 
  |  
  |       explicit print(const std::string& scalar_format = "%10.5f") 
  |       : scalar_format_(scalar_format) 
  |       { 
  |          exprtk::enable_zero_parameters(*this); 
  |       } 
  |  
  |       inline T operator() (parameter_list_t parameters) exprtk_override 
  |       { 
  |          details::print_impl<T>::process(scalar_format_,parameters); 
  |          return T(0); 
  |       } 
  |  
  |       std::string scalar_format_; 
  |    }; 
  |  
  |    template <typename T> 
  |    struct println exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |       typedef typename igeneric_function<T>::parameter_list_t parameter_list_t; 
  |  
  |       using exprtk::igeneric_function<T>::operator(); 
  |  
  |       explicit println(const std::string& scalar_format = "%10.5f") 
  |       : scalar_format_(scalar_format) 
  |       { 
  |          exprtk::enable_zero_parameters(*this); 
  |       } 
  |  
  |       inline T operator() (parameter_list_t parameters) exprtk_override 
  |       { 
  |          details::print_impl<T>::process(scalar_format_,parameters); 
  |          printf("\n"); 
  |          return T(0); 
  |       } 
  |  
  |       std::string scalar_format_; 
  |    }; 
  |  
  |    template <typename T> 
  |    struct package 
  |    { 
  |       print  <T> p; 
  |       println<T> pl; 
  |  
  |       bool register_package(exprtk::symbol_table<T>& symtab) 
  |       { 
  |          #define exprtk_register_function(FunctionName, FunctionType)             \ 
  |          if (!symtab.add_function(FunctionName,FunctionType))                     \ 
  |          {                                                                        \ 
  |             exprtk_debug((                                                        \ 
  |               "exprtk::rtl::io::register_package - Failed to add function: %s\n", \ 
  |               FunctionName));                                                     \ 
  |             return false;                                                         \ 
  |          }                                                                        \ 
  |  
  |          exprtk_register_function("print"  , p ) 
  |          exprtk_register_function("println", pl) 
  |          #undef exprtk_register_function 
  |  
  |          return true; 
  |       } 
  |    }; 
  |  
  |    } // namespace exprtk::rtl::io 
  |    } // namespace exprtk::rtl 
  | }    // namespace exprtk 
  | #endif 
  |  
  | #ifndef exprtk_disable_rtl_io_file 
  | #include  
  | namespace exprtk 
  | { 
  |    namespace rtl { namespace io { namespace file { namespace details 
  |    { 
  |       using ::exprtk::details::char_ptr; 
  |       using ::exprtk::details::char_cptr; 
  |  
  |       enum file_mode 
  |       { 
  |          e_error = 0, 
  |          e_read  = 1, 
  |          e_write = 2, 
  |          e_rdwrt = 4 
  |       }; 
  |  
  |       struct file_descriptor 
  |       { 
  |          file_descriptor(const std::string& fname, const std::string& access) 
  |          : stream_ptr(0) 
  |          , mode(get_file_mode(access)) 
  |          , file_name(fname) 
  |          {} 
  |  
  |          void*       stream_ptr; 
  |          file_mode   mode; 
  |          std::string file_name; 
  |  
  |          bool open() 
  |          { 
  |             if (e_read == mode) 
  |             { 
  |                std::ifstream* stream = new std::ifstream(file_name.c_str(),std::ios::binary); 
  |  
  |                if (!(*stream)) 
  |                { 
  |                   file_name.clear(); 
  |                   delete stream; 
  |  
  |                   return false; 
  |                } 
  |  
  |                stream_ptr = stream; 
  |  
  |                return true; 
  |             } 
  |             else if (e_write == mode) 
  |             { 
  |                std::ofstream* stream = new std::ofstream(file_name.c_str(),std::ios::binary); 
  |  
  |                if (!(*stream)) 
  |                { 
  |                   file_name.clear(); 
  |                   delete stream; 
  |  
  |                   return false; 
  |                } 
  |  
  |                stream_ptr = stream; 
  |  
  |                return true; 
  |             } 
  |             else if (e_rdwrt == mode) 
  |             { 
  |                std::fstream* stream = new std::fstream(file_name.c_str(),std::ios::binary); 
  |  
  |                if (!(*stream)) 
  |                { 
  |                   file_name.clear(); 
  |                   delete stream; 
  |  
  |                   return false; 
  |                } 
  |  
  |                stream_ptr = stream; 
  |  
  |                return true; 
  |             } 
  |  
  |             return false; 
  |          } 
  |  
  |          template <typename Stream, typename Ptr> 
  |          void close(Ptr& p) 
  |          { 
  |             Stream* stream = reinterpret_cast<Stream*>(p); 
  |             stream->close(); 
  |             delete stream; 
  |             p = reinterpret_cast<Ptr>(0); 
  |          } 
  |  
  |          bool close() 
  |          { 
  |             switch (mode) 
  |             { 
  |                case e_read  : close<std::ifstream>(stream_ptr); 
  |                               break; 
  |  
  |                case e_write : close<std::ofstream>(stream_ptr); 
  |                               break; 
  |  
  |                case e_rdwrt : close<std::fstream> (stream_ptr); 
  |                               break; 
  |  
  |                default      : return false; 
  |             } 
  |  
  |             return true; 
  |          } 
  |  
  |          template <typename View> 
  |          bool write(const View& view, const std::size_t amount, const std::size_t offset = 0) 
  |          { 
  |             switch (mode) 
  |             { 
  |                case e_write : reinterpret_cast<std::ofstream*>(stream_ptr)-> 
  |                                  write(reinterpret_cast<char_cptr>(view.begin() + offset), amount * sizeof(typename View::value_t)); 
  |                               break; 
  |  
  |                case e_rdwrt : reinterpret_cast<std::fstream*>(stream_ptr)-> 
  |                                  write(reinterpret_cast<char_cptr>(view.begin() + offset) , amount * sizeof(typename View::value_t)); 
  |                               break; 
  |  
  |                default      : return false; 
  |             } 
  |  
  |             return true; 
  |          } 
  |  
  |          template <typename View> 
  |          bool read(View& view, const std::size_t amount, const std::size_t offset = 0) 
  |          { 
  |             switch (mode) 
  |             { 
  |                case e_read  : reinterpret_cast<std::ifstream*>(stream_ptr)-> 
  |                                  read(reinterpret_cast<char_ptr>(view.begin() + offset), amount * sizeof(typename View::value_t)); 
  |                               break; 
  |  
  |                case e_rdwrt : reinterpret_cast<std::fstream*>(stream_ptr)-> 
  |                                  read(reinterpret_cast<char_ptr>(view.begin() + offset) , amount * sizeof(typename View::value_t)); 
  |                               break; 
  |  
  |                default      : return false; 
  |             } 
  |  
  |             return true; 
  |          } 
  |  
  |          bool getline(std::string& s) 
  |          { 
  |             switch (mode) 
  |             { 
  |                case e_read  : return (!!std::getline(*reinterpret_cast<std::ifstream*>(stream_ptr),s)); 
  |                case e_rdwrt : return (!!std::getline(*reinterpret_cast<std::fstream* >(stream_ptr),s)); 
  |                default      : return false; 
  |             } 
  |          } 
  |  
  |          bool eof() const 
  |          { 
  |             switch (mode) 
  |             { 
  |                case e_read  : return reinterpret_cast<std::ifstream*>(stream_ptr)->eof(); 
  |                case e_write : return reinterpret_cast<std::ofstream*>(stream_ptr)->eof(); 
  |                case e_rdwrt : return reinterpret_cast<std::fstream* >(stream_ptr)->eof(); 
  |                default      : return true; 
  |             } 
  |          } 
  |  
  |          file_mode get_file_mode(const std::string& access) const 
  |          { 
  |             if (access.empty() || access.size() > 2) 
  |                return e_error; 
  |  
  |             std::size_t w_cnt = 0; 
  |             std::size_t r_cnt = 0; 
  |  
  |             for (std::size_t i = 0; i < access.size(); ++i) 
  |             { 
  |                switch (std::tolower(access[i])) 
  |                { 
  |                   case 'r' : r_cnt++; break; 
  |                   case 'w' : w_cnt++; break; 
  |                   default  : return e_error; 
  |                } 
  |             } 
  |  
  |             if ((0 == r_cnt) && (0 == w_cnt)) 
  |                return e_error; 
  |             else if ((r_cnt > 1) || (w_cnt > 1)) 
  |                return e_error; 
  |             else if ((1 == r_cnt) && (1 == w_cnt)) 
  |                return e_rdwrt; 
  |             else if (1 == r_cnt) 
  |                return e_read; 
  |             else 
  |                return e_write; 
  |          } 
  |       }; 
  |  
  |       template <typename T> 
  |       file_descriptor* make_handle(T v) 
  |       { 
  |          const std::size_t fd_size    = sizeof(details::file_descriptor*); 
  |          details::file_descriptor* fd = reinterpret_cast<file_descriptor*>(0); 
  |  
  |          std::memcpy(reinterpret_cast<char_ptr >(&fd), 
  |                      reinterpret_cast<char_cptr>(&v ), 
  |                      fd_size); 
  |          return fd; 
  |       } 
  |  
  |       template <typename T> 
  |       void perform_check() 
  |       { 
  |          #ifdef _MSC_VER 
  |          #pragma warning(push) 
  |          #pragma warning(disable: 4127) 
  |          #endif 
  |          if (sizeof(T) < sizeof(void*)) 
  |          { 
  |             throw std::runtime_error("exprtk::rtl::io::file - Error - pointer size larger than holder."); 
  |          } 
  |          #ifdef _MSC_VER 
  |          #pragma warning(pop) 
  |          #endif 
  |          assert(sizeof(T) <= sizeof(void*)); 
  |       } 
  |  
  |    } // namespace exprtk::rtl::io::file::details 
  |  
  |    template <typename T> 
  |    class open exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::string_view    string_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       open() 
  |       : exprtk::igeneric_function<T>("S|SS") 
  |       { details::perform_check<T>(); } 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          const std::string file_name = to_str(string_t(parameters[0])); 
  |  
  |          if (file_name.empty()) 
  |          { 
  |             return T(0); 
  |          } 
  |  
  |          if ((1 == ps_index) && (0 == string_t(parameters[1]).size())) 
  |          { 
  |             return T(0); 
  |          } 
  |  
  |          const std::string access = 
  |             (0 == ps_index) ? "r" : to_str(string_t(parameters[1])); 
  |  
  |          details::file_descriptor* fd = new details::file_descriptor(file_name,access); 
  |  
  |          if (fd->open()) 
  |          { 
  |             T t = T(0); 
  |  
  |             const std::size_t fd_size = sizeof(details::file_descriptor*); 
  |  
  |             std::memcpy(reinterpret_cast<char*>(&t ), 
  |                         reinterpret_cast<char*>(&fd), 
  |                         fd_size); 
  |             return t; 
  |          } 
  |          else 
  |          { 
  |             delete fd; 
  |             return T(0); 
  |          } 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    struct close exprtk_final : public exprtk::ifunction<T> 
  |    { 
  |       using exprtk::ifunction<T>::operator(); 
  |  
  |       close() 
  |       : exprtk::ifunction<T>(1) 
  |       { details::perform_check<T>(); } 
  |  
  |       inline T operator() (const T& v) exprtk_override 
  |       { 
  |          details::file_descriptor* fd = details::make_handle(v); 
  |  
  |          if (!fd->close()) 
  |             return T(0); 
  |  
  |          delete fd; 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class write exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::string_view    string_t; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       write() 
  |       : igfun_t("TS|TST|TV|TVT") 
  |       { details::perform_check<T>(); } 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          details::file_descriptor* fd = details::make_handle(scalar_t(parameters[0])()); 
  |  
  |          switch (ps_index) 
  |          { 
  |             case 0  : { 
  |                          const string_t buffer(parameters[1]); 
  |                          const std::size_t amount = buffer.size(); 
  |                          return T(fd->write(buffer, amount) ? 1 : 0); 
  |                       } 
  |  
  |             case 1  : { 
  |                          const string_t buffer(parameters[1]); 
  |                          const std::size_t amount = 
  |                                   std::min(buffer.size(), 
  |                                            static_cast<std::size_t>(scalar_t(parameters[2])())); 
  |                          return T(fd->write(buffer, amount) ? 1 : 0); 
  |                       } 
  |  
  |             case 2  : { 
  |                          const vector_t vec(parameters[1]); 
  |                          const std::size_t amount = vec.size(); 
  |                          return T(fd->write(vec, amount) ? 1 : 0); 
  |                       } 
  |  
  |             case 3  : { 
  |                          const vector_t vec(parameters[1]); 
  |                          const std::size_t amount = 
  |                                   std::min(vec.size(), 
  |                                            static_cast<std::size_t>(scalar_t(parameters[2])())); 
  |                          return T(fd->write(vec, amount) ? 1 : 0); 
  |                       } 
  |          } 
  |  
  |          return T(0); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class read exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::string_view    string_t; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       read() 
  |       : igfun_t("TS|TST|TV|TVT") 
  |       { details::perform_check<T>(); } 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          details::file_descriptor* fd = details::make_handle(scalar_t(parameters[0])()); 
  |  
  |          switch (ps_index) 
  |          { 
  |             case 0  : { 
  |                          string_t buffer(parameters[1]); 
  |                          const std::size_t amount = buffer.size(); 
  |                          return T(fd->read(buffer,amount) ? 1 : 0); 
  |                       } 
  |  
  |             case 1  : { 
  |                          string_t buffer(parameters[1]); 
  |                          const std::size_t amount = 
  |                                   std::min(buffer.size(), 
  |                                            static_cast<std::size_t>(scalar_t(parameters[2])())); 
  |                          return T(fd->read(buffer,amount) ? 1 : 0); 
  |                       } 
  |  
  |             case 2  : { 
  |                          vector_t vec(parameters[1]); 
  |                          const std::size_t amount = vec.size(); 
  |                          return T(fd->read(vec,amount) ? 1 : 0); 
  |                       } 
  |  
  |             case 3  : { 
  |                          vector_t vec(parameters[1]); 
  |                          const std::size_t amount = 
  |                                   std::min(vec.size(), 
  |                                            static_cast<std::size_t>(scalar_t(parameters[2])())); 
  |                          return T(fd->read(vec,amount) ? 1 : 0); 
  |                       } 
  |          } 
  |  
  |          return T(0); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class getline exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::string_view    string_t; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       getline() 
  |       : igfun_t("T",igfun_t::e_rtrn_string) 
  |       { details::perform_check<T>(); } 
  |  
  |       inline T operator() (std::string& result, parameter_list_t parameters) exprtk_override 
  |       { 
  |          details::file_descriptor* fd = details::make_handle(scalar_t(parameters[0])()); 
  |          return T(fd->getline(result) ? 1 : 0); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    struct eof exprtk_final : public exprtk::ifunction<T> 
  |    { 
  |       using exprtk::ifunction<T>::operator(); 
  |  
  |       eof() 
  |       : exprtk::ifunction<T>(1) 
  |       { details::perform_check<T>(); } 
  |  
  |       inline T operator() (const T& v) exprtk_override 
  |       { 
  |          details::file_descriptor* fd = details::make_handle(v); 
  |          return (fd->eof() ? T(1) : T(0)); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    struct package 
  |    { 
  |       open   <T> o; 
  |       close  <T> c; 
  |       write  <T> w; 
  |       read   <T> r; 
  |       getline<T> g; 
  |       eof    <T> e; 
  |  
  |       bool register_package(exprtk::symbol_table<T>& symtab) 
  |       { 
  |          #define exprtk_register_function(FunctionName, FunctionType)                   \ 
  |          if (!symtab.add_function(FunctionName,FunctionType))                           \ 
  |          {                                                                              \ 
  |             exprtk_debug((                                                              \ 
  |               "exprtk::rtl::io::file::register_package - Failed to add function: %s\n", \ 
  |               FunctionName));                                                           \ 
  |             return false;                                                               \ 
  |          }                                                                              \ 
  |  
  |          exprtk_register_function("open"    , o) 
  |          exprtk_register_function("close"   , c) 
  |          exprtk_register_function("write"   , w) 
  |          exprtk_register_function("read"    , r) 
  |          exprtk_register_function("getline" , g) 
  |          exprtk_register_function("eof"     , e) 
  |          #undef exprtk_register_function 
  |  
  |          return true; 
  |       } 
  |    }; 
  |  
  |    } // namespace exprtk::rtl::io::file 
  |    } // namespace exprtk::rtl::io 
  |    } // namespace exprtk::rtl 
  | }    // namespace exprtk 
  | #endif 
  |  
  | #ifndef exprtk_disable_rtl_vecops 
  | namespace exprtk 
  | { 
  |    namespace rtl { namespace vecops { 
  |  
  |    namespace helper 
  |    { 
  |       template <typename Vector> 
  |       inline bool invalid_range(const Vector& v, const std::size_t r0, const std::size_t r1) 
  |       { 
  |          if (r0 > (v.size() - 1)) 
  |             return true; 
  |          else if (r1 > (v.size() - 1)) 
  |             return true; 
  |          else if (r1 < r0) 
  |             return true; 
  |          else 
  |             return false; 
  |       } 
  |  
  |       template <typename T> 
  |       struct load_vector_range 
  |       { 
  |          typedef typename exprtk::igeneric_function<T> igfun_t; 
  |          typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |          typedef typename igfun_t::generic_type        generic_type; 
  |          typedef typename generic_type::scalar_view    scalar_t; 
  |          typedef typename generic_type::vector_view    vector_t; 
  |  
  |          static inline bool process(parameter_list_t& parameters, 
  |                                     std::size_t& r0, std::size_t& r1, 
  |                                     const std::size_t& r0_prmidx, 
  |                                     const std::size_t& r1_prmidx, 
  |                                     const std::size_t vec_idx = 0) 
  |          { 
  |             if (r0_prmidx >= parameters.size()) 
  |                return false; 
  |  
  |             if (r1_prmidx >= parameters.size()) 
  |                return false; 
  |  
  |             if (!scalar_t(parameters[r0_prmidx]).to_uint(r0)) 
  |                return false; 
  |  
  |             if (!scalar_t(parameters[r1_prmidx]).to_uint(r1)) 
  |                return false; 
  |  
  |             return !invalid_range(vector_t(parameters[vec_idx]), r0, r1); 
  |          } 
  |       }; 
  |    } 
  |  
  |    namespace details 
  |    { 
  |       template <typename T> 
  |       inline void kahan_sum(T& sum, T& error, const T v) 
  |       { 
  |          const T x = v - error; 
  |          const T y = sum + x; 
  |          error = (y - sum) - x; 
  |          sum = y; 
  |       } 
  |  
  |    } // namespace exprtk::rtl::details 
  |  
  |    template <typename T> 
  |    class all_true exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       all_true() 
  |       : exprtk::igeneric_function<T>("V|VTT|T*") 
  |         /* 
  |            Overloads: 
  |            0. V   - vector 
  |            1. VTT - vector, r0, r1 
  |            2. T*  - T....T 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          if (2 == ps_index) 
  |          { 
  |             for (std::size_t i = 0; i < parameters.size(); ++i) 
  |             { 
  |                if (scalar_t(parameters[i])() == T(0)) 
  |                { 
  |                   return T(0); 
  |                } 
  |             } 
  |          } 
  |          else 
  |          { 
  |             const vector_t vec(parameters[0]); 
  |  
  |             std::size_t r0 = 0; 
  |             std::size_t r1 = vec.size() - 1; 
  |  
  |             if ( 
  |                  (1 == ps_index) && 
  |                  !helper::load_vector_range<T>::process(parameters, r0, r1, 1, 2, 0) 
  |                ) 
  |             { 
  |                return std::numeric_limits<T>::quiet_NaN(); 
  |             } 
  |  
  |             for (std::size_t i = r0; i <= r1; ++i) 
  |             { 
  |                if (vec[i] == T(0)) 
  |                { 
  |                   return T(0); 
  |                } 
  |             } 
  |          } 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class all_false exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       all_false() 
  |       : exprtk::igeneric_function<T>("V|VTT|T*") 
  |         /* 
  |            Overloads: 
  |            0. V   - vector 
  |            1. VTT - vector, r0, r1 
  |            2. T*  - T....T 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          if (2 == ps_index) 
  |          { 
  |             for (std::size_t i = 0; i < parameters.size(); ++i) 
  |             { 
  |                if (scalar_t(parameters[i])() != T(0)) 
  |                { 
  |                   return T(0); 
  |                } 
  |             } 
  |          } 
  |          else 
  |          { 
  |             const vector_t vec(parameters[0]); 
  |  
  |             std::size_t r0 = 0; 
  |             std::size_t r1 = vec.size() - 1; 
  |  
  |             if ( 
  |                  (1 == ps_index) && 
  |                  !helper::load_vector_range<T>::process(parameters, r0, r1, 1, 2, 0) 
  |                ) 
  |             { 
  |                return std::numeric_limits<T>::quiet_NaN(); 
  |             } 
  |  
  |             for (std::size_t i = r0; i <= r1; ++i) 
  |             { 
  |                if (vec[i] != T(0)) 
  |                { 
  |                   return T(0); 
  |                } 
  |             } 
  |          } 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class any_true exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       any_true() 
  |       : exprtk::igeneric_function<T>("V|VTT|T*") 
  |         /* 
  |            Overloads: 
  |            0. V   - vector 
  |            1. VTT - vector, r0, r1 
  |            2. T*  - T....T 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          if (2 == ps_index) 
  |          { 
  |             for (std::size_t i = 0; i < parameters.size(); ++i) 
  |             { 
  |                if (scalar_t(parameters[i])() != T(0)) 
  |                { 
  |                   return T(1); 
  |                } 
  |             } 
  |          } 
  |          else 
  |          { 
  |             const vector_t vec(parameters[0]); 
  |  
  |             std::size_t r0 = 0; 
  |             std::size_t r1 = vec.size() - 1; 
  |  
  |             if ( 
  |                  (1 == ps_index) && 
  |                  !helper::load_vector_range<T>::process(parameters, r0, r1, 1, 2, 0) 
  |                ) 
  |             { 
  |                return std::numeric_limits<T>::quiet_NaN(); 
  |             } 
  |  
  |             for (std::size_t i = r0; i <= r1; ++i) 
  |             { 
  |                if (vec[i] != T(0)) 
  |                { 
  |                   return T(1); 
  |                } 
  |             } 
  |          } 
  |  
  |          return T(0); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class any_false exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       any_false() 
  |       : exprtk::igeneric_function<T>("V|VTT|T*") 
  |         /* 
  |            Overloads: 
  |            0. V   - vector 
  |            1. VTT - vector, r0, r1 
  |            2. T*  - T....T 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          if (2 == ps_index) 
  |          { 
  |             for (std::size_t i = 0; i < parameters.size(); ++i) 
  |             { 
  |                if (scalar_t(parameters[i])() == T(0)) 
  |                { 
  |                   return T(1); 
  |                } 
  |             } 
  |          } 
  |          else 
  |          { 
  |             const vector_t vec(parameters[0]); 
  |  
  |             std::size_t r0 = 0; 
  |             std::size_t r1 = vec.size() - 1; 
  |  
  |             if ( 
  |                  (1 == ps_index) && 
  |                  !helper::load_vector_range<T>::process(parameters, r0, r1, 1, 2, 0) 
  |                ) 
  |             { 
  |                return std::numeric_limits<T>::quiet_NaN(); 
  |             } 
  |  
  |             for (std::size_t i = r0; i <= r1; ++i) 
  |             { 
  |                if (vec[i] == T(0)) 
  |                { 
  |                   return T(1); 
  |                } 
  |             } 
  |          } 
  |  
  |          return T(0); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class count exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       count() 
  |       : exprtk::igeneric_function<T>("V|VTT|T*") 
  |         /* 
  |            Overloads: 
  |            0. V   - vector 
  |            1. VTT - vector, r0, r1 
  |            2. T*  - T....T 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          std::size_t cnt = 0; 
  |  
  |          if (2 == ps_index) 
  |          { 
  |             for (std::size_t i = 0; i < parameters.size(); ++i) 
  |             { 
  |                if (scalar_t(parameters[i])() != T(0)) ++cnt; 
  |             } 
  |          } 
  |          else 
  |          { 
  |             const vector_t vec(parameters[0]); 
  |  
  |             std::size_t r0 = 0; 
  |             std::size_t r1 = vec.size() - 1; 
  |  
  |             if ( 
  |                  (1 == ps_index) && 
  |                  !helper::load_vector_range<T>::process(parameters, r0, r1, 1, 2, 0) 
  |                ) 
  |             { 
  |                return std::numeric_limits<T>::quiet_NaN(); 
  |             } 
  |  
  |             for (std::size_t i = r0; i <= r1; ++i) 
  |             { 
  |                if (vec[i] != T(0)) ++cnt; 
  |             } 
  |          } 
  |  
  |          return T(cnt); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class copy exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       copy() 
  |       : exprtk::igeneric_function<T>("VV|VTTVTT") 
  |         /* 
  |            Overloads: 
  |            0. VV     - x(vector), y(vector) 
  |            1. VTTVTT - x(vector), xr0, xr1, y(vector), yr0, yr1, 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          const vector_t x(parameters[0]); 
  |                vector_t y(parameters[(0 == ps_index) ? 1 : 3]); 
  |  
  |          std::size_t xr0 = 0; 
  |          std::size_t xr1 = x.size() - 1; 
  |  
  |          std::size_t yr0 = 0; 
  |          std::size_t yr1 = y.size() - 1; 
  |  
  |          if (1 == ps_index) 
  |          { 
  |             if ( 
  |                  !helper::load_vector_range<T>::process(parameters, xr0, xr1, 1, 2, 0) || 
  |                  !helper::load_vector_range<T>::process(parameters, yr0, yr1, 4, 5, 3) 
  |                ) 
  |                return T(0); 
  |          } 
  |  
  |          const std::size_t n = std::min(xr1 - xr0 + 1, yr1 - yr0 + 1); 
  |  
  |          std::copy( 
  |             x.begin() + xr0, 
  |             x.begin() + xr0 + n, 
  |             y.begin() + yr0); 
  |  
  |          return T(n); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class rol exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       rol() 
  |       : exprtk::igeneric_function<T>("VT|VTTT") 
  |         /* 
  |            Overloads: 
  |            0. VT   - vector, N 
  |            1. VTTT - vector, N, r0, r1 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          vector_t vec(parameters[0]); 
  |  
  |          std::size_t n  = 0; 
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = vec.size() - 1; 
  |  
  |          if (!scalar_t(parameters[1]).to_uint(n)) 
  |             return T(0); 
  |  
  |          if ( 
  |               (1 == ps_index) && 
  |               !helper::load_vector_range<T>::process(parameters, r0, r1, 2, 3, 0) 
  |             ) 
  |             return T(0); 
  |  
  |          const std::size_t dist  = r1 - r0 + 1; 
  |          const std::size_t shift = n % dist; 
  |  
  |          std::rotate( 
  |             vec.begin() + r0, 
  |             vec.begin() + r0 + shift, 
  |             vec.begin() + r1 + 1); 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class ror exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       ror() 
  |       : exprtk::igeneric_function<T>("VT|VTTT") 
  |         /* 
  |            Overloads: 
  |            0. VT   - vector, N 
  |            1. VTTT - vector, N, r0, r1 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          vector_t vec(parameters[0]); 
  |  
  |          std::size_t n  = 0; 
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = vec.size() - 1; 
  |  
  |          if (!scalar_t(parameters[1]).to_uint(n)) 
  |             return T(0); 
  |  
  |          if ( 
  |               (1 == ps_index) && 
  |               !helper::load_vector_range<T>::process(parameters, r0, r1, 2, 3, 0) 
  |             ) 
  |             return T(0); 
  |  
  |          const std::size_t dist  = r1 - r0 + 1; 
  |          const std::size_t shift = (dist - (n % dist)) % dist; 
  |  
  |          std::rotate( 
  |             vec.begin() + r0, 
  |             vec.begin() + r0 + shift, 
  |             vec.begin() + r1 + 1); 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class reverse exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       reverse() 
  |       : exprtk::igeneric_function<T>("V|VTT") 
  |         /* 
  |            Overloads: 
  |            0. V   - vector 
  |            1. VTT - vector, r0, r1 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          vector_t vec(parameters[0]); 
  |  
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = vec.size() - 1; 
  |  
  |          if ( 
  |               (1 == ps_index) && 
  |               !helper::load_vector_range<T>::process(parameters, r0, r1, 1, 2, 0) 
  |             ) 
  |             return T(0); 
  |  
  |          std::reverse(vec.begin() + r0, vec.begin() + r1 + 1); 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class shift_left exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       shift_left() 
  |       : exprtk::igeneric_function<T>("VT|VTTT") 
  |         /* 
  |            Overloads: 
  |            0. VT   - vector, N 
  |            1. VTTT - vector, N, r0, r1 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          vector_t vec(parameters[0]); 
  |  
  |          std::size_t n  = 0; 
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = vec.size() - 1; 
  |  
  |          if (!scalar_t(parameters[1]).to_uint(n)) 
  |             return T(0); 
  |  
  |          if ( 
  |               (1 == ps_index) && 
  |               !helper::load_vector_range<T>::process(parameters, r0, r1, 2, 3, 0) 
  |             ) 
  |             return T(0); 
  |  
  |          const std::size_t dist = r1 - r0 + 1; 
  |  
  |          if (n > dist) 
  |             return T(0); 
  |  
  |          std::rotate( 
  |             vec.begin() + r0, 
  |             vec.begin() + r0 + n, 
  |             vec.begin() + r1 + 1); 
  |  
  |          for (std::size_t i = r1 - n + 1ULL; i <= r1; ++i) 
  |          { 
  |             vec[i] = T(0); 
  |          } 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class shift_right exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       shift_right() 
  |       : exprtk::igeneric_function<T>("VT|VTTT") 
  |         /* 
  |            Overloads: 
  |            0. VT   - vector, N 
  |            1. VTTT - vector, N, r0, r1 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          vector_t vec(parameters[0]); 
  |  
  |          std::size_t n  = 0; 
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = vec.size() - 1; 
  |  
  |          if (!scalar_t(parameters[1]).to_uint(n)) 
  |             return T(0); 
  |  
  |          if ( 
  |               (1 == ps_index) && 
  |               !helper::load_vector_range<T>::process(parameters, r0, r1, 2, 3, 0) 
  |             ) 
  |             return T(0); 
  |  
  |          const std::size_t dist = r1 - r0 + 1; 
  |  
  |          if (n > dist) 
  |             return T(0); 
  |  
  |          const std::size_t shift = (dist - (n % dist)) % dist; 
  |  
  |          std::rotate( 
  |             vec.begin() + r0, 
  |             vec.begin() + r0 + shift, 
  |             vec.begin() + r1 + 1); 
  |  
  |          for (std::size_t i = r0; i < r0 + n; ++i) 
  |          { 
  |             vec[i] = T(0); 
  |          } 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class sort exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::string_view    string_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       sort() 
  |       : exprtk::igeneric_function<T>("V|VTT|VS|VSTT") 
  |         /* 
  |            Overloads: 
  |            0. V    - vector 
  |            1. VTT  - vector, r0, r1 
  |            2. VS   - vector, string 
  |            3. VSTT - vector, string, r0, r1 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          vector_t vec(parameters[0]); 
  |  
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = vec.size() - 1; 
  |  
  |          if ((1 == ps_index) && !helper::load_vector_range<T>::process(parameters, r0, r1, 1, 2, 0)) 
  |             return T(0); 
  |          if ((3 == ps_index) && !helper::load_vector_range<T>::process(parameters, r0, r1, 2, 3, 0)) 
  |             return T(0); 
  |  
  |          bool ascending = true; 
  |  
  |          if ((2 == ps_index) || (3 == ps_index)) 
  |          { 
  |             if (exprtk::details::imatch(to_str(string_t(parameters[1])),"ascending")) 
  |                ascending = true; 
  |             else if (exprtk::details::imatch(to_str(string_t(parameters[1])),"descending")) 
  |                ascending = false; 
  |             else 
  |                return T(0); 
  |          } 
  |  
  |          if (ascending) 
  |             std::sort( 
  |                vec.begin() + r0, 
  |                vec.begin() + r1 + 1, 
  |                std::less<T>()); 
  |          else 
  |             std::sort( 
  |                vec.begin() + r0, 
  |                vec.begin() + r1 + 1, 
  |                std::greater<T>()); 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class nthelement exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       nthelement() 
  |       : exprtk::igeneric_function<T>("VT|VTTT") 
  |         /* 
  |            Overloads: 
  |            0. VT   - vector, nth-element 
  |            1. VTTT - vector, nth-element, r0, r1 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          vector_t vec(parameters[0]); 
  |  
  |          std::size_t n  = 0; 
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = vec.size() - 1; 
  |  
  |          if (!scalar_t(parameters[1]).to_uint(n)) 
  |             return T(0); 
  |  
  |          if ((1 == ps_index) && !helper::load_vector_range<T>::process(parameters, r0, r1, 2, 3, 0)) 
  |          { 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          std::nth_element( 
  |             vec.begin() + r0, 
  |             vec.begin() + r0 + n , 
  |             vec.begin() + r1 + 1); 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class assign exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       assign() 
  |       : exprtk::igeneric_function<T>("VT|VTTT|VTTTT") 
  |         /* 
  |            Overloads: 
  |            0. VT    - vector, V 
  |            1. VTTT  - vector, V, r0, r1 
  |            2. VTTTT - vector, V, r0, r1, SS 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          vector_t vec(parameters[0]); 
  |  
  |          const T assign_value = scalar_t(parameters[1]); 
  |  
  |          const std::size_t step_size = (2 != ps_index) ? 1 : 
  |                                        static_cast<std::size_t>(scalar_t(parameters.back())()); 
  |  
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = vec.size() - 1; 
  |  
  |          if ( 
  |               ((ps_index == 1) || (ps_index == 2)) && 
  |               !helper::load_vector_range<T>::process(parameters, r0, r1, 2, 3, 0) 
  |             ) 
  |          { 
  |             return T(0); 
  |          } 
  |  
  |          for (std::size_t i = r0; i <= r1; i += step_size) 
  |          { 
  |             vec[i] = assign_value; 
  |          } 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class iota exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       iota() 
  |       : exprtk::igeneric_function<T>("VTT|VT|VTTTT|VTTT") 
  |         /* 
  |            Overloads: 
  |            0. VTT  - vector, SV, SS 
  |            1. VT   - vector, SV, SS (+1) 
  |            2. VTTT - vector, r0, r1, SV, SS 
  |            3. VTT  - vector, r0, r1, SV, SS (+1) 
  |  
  |            Where: 
  |            1. SV - Start value 
  |            2. SS - Step size 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          vector_t vec(parameters[0]); 
  |  
  |          const T start_value = (ps_index <= 1) ? 
  |                                scalar_t(parameters[1]) : 
  |                                scalar_t(parameters[3]) ; 
  |  
  |          const T step_size = ((0 == ps_index) || (2 == ps_index)) ? 
  |                              scalar_t(parameters.back())() : 
  |                              T(1) ; 
  |  
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = vec.size() - 1; 
  |  
  |          if ( 
  |               ((ps_index == 2) || (ps_index == 3)) && 
  |               !helper::load_vector_range<T>::process(parameters, r0, r1, 1, 2, 0) 
  |             ) 
  |          { 
  |             return T(0); 
  |          } 
  |  
  |          for (std::size_t i = r0; i <= r1; ++i) 
  |          { 
  |             vec[i] = start_value + ((i - r0) * step_size); 
  |          } 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class sumk exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       sumk() 
  |       : exprtk::igeneric_function<T>("V|VTT|VTTT") 
  |         /* 
  |            Overloads: 
  |            0. V    - vector 
  |            1. VTT  - vector, r0, r1 
  |            2. VTTT - vector, r0, r1, stride 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          const vector_t vec(parameters[0]); 
  |  
  |          const std::size_t stride = (2 != ps_index) ? 1 : 
  |                                     static_cast<std::size_t>(scalar_t(parameters[3])()); 
  |  
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = vec.size() - 1; 
  |  
  |          if ( 
  |               ((1 == ps_index) || (2 == ps_index)) && 
  |               !helper::load_vector_range<T>::process(parameters, r0, r1, 1, 2, 0) 
  |             ) 
  |          { 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          T result = T(0); 
  |          T error  = T(0); 
  |  
  |          for (std::size_t i = r0; i <= r1; i += stride) 
  |          { 
  |             details::kahan_sum(result, error, vec[i]); 
  |          } 
  |  
  |          return result; 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class axpy exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       axpy() 
  |       : exprtk::igeneric_function<T>("TVV|TVVTT") 
  |         /* 
  |            y <- ax + y 
  |            Overloads: 
  |            0. TVV   - a, x(vector), y(vector) 
  |            1. TVVTT - a, x(vector), y(vector), r0, r1 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          const vector_t x(parameters[1]); 
  |                vector_t y(parameters[2]); 
  |  
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = std::min(x.size(),y.size()) - 1; 
  |  
  |          if ((1 == ps_index) && !helper::load_vector_range<T>::process(parameters, r0, r1, 3, 4, 1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          else if (helper::invalid_range(y, r0, r1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |  
  |          const T a = scalar_t(parameters[0])(); 
  |  
  |          for (std::size_t i = r0; i <= r1; ++i) 
  |          { 
  |             y[i] = (a * x[i]) + y[i]; 
  |          } 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class axpby exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       axpby() 
  |       : exprtk::igeneric_function<T>("TVTV|TVTVTT") 
  |         /* 
  |            y <- ax + by 
  |            Overloads: 
  |            0. TVTV   - a, x(vector), b, y(vector) 
  |            1. TVTVTT - a, x(vector), b, y(vector), r0, r1 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          const vector_t x(parameters[1]); 
  |                vector_t y(parameters[3]); 
  |  
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = std::min(x.size(),y.size()) - 1; 
  |  
  |          if ((1 == ps_index) && !helper::load_vector_range<T>::process(parameters, r0, r1, 4, 5, 1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          else if (helper::invalid_range(y, r0, r1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |  
  |          const T a = scalar_t(parameters[0])(); 
  |          const T b = scalar_t(parameters[2])(); 
  |  
  |          for (std::size_t i = r0; i <= r1; ++i) 
  |          { 
  |             y[i] = (a * x[i]) + (b * y[i]); 
  |          } 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class axpyz exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       axpyz() 
  |       : exprtk::igeneric_function<T>("TVVV|TVVVTT") 
  |         /* 
  |            z <- ax + y 
  |            Overloads: 
  |            0. TVVV   - a, x(vector), y(vector), z(vector) 
  |            1. TVVVTT - a, x(vector), y(vector), z(vector), r0, r1 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          const vector_t x(parameters[1]); 
  |          const vector_t y(parameters[2]); 
  |                vector_t z(parameters[3]); 
  |  
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = std::min(x.size(),y.size()) - 1; 
  |  
  |          if ((1 == ps_index) && !helper::load_vector_range<T>::process(parameters, r0, r1, 4, 5, 1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          else if (helper::invalid_range(y, r0, r1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          else if (helper::invalid_range(z, r0, r1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |  
  |          const T a = scalar_t(parameters[0])(); 
  |  
  |          for (std::size_t i = r0; i <= r1; ++i) 
  |          { 
  |             z[i] = (a * x[i]) + y[i]; 
  |          } 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class axpbyz exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       axpbyz() 
  |       : exprtk::igeneric_function<T>("TVTVV|TVTVVTT") 
  |         /* 
  |            z <- ax + by 
  |            Overloads: 
  |            0. TVTVV   - a, x(vector), b, y(vector), z(vector) 
  |            1. TVTVVTT - a, x(vector), b, y(vector), z(vector), r0, r1 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          const vector_t x(parameters[1]); 
  |          const vector_t y(parameters[3]); 
  |                vector_t z(parameters[4]); 
  |  
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = std::min(x.size(),y.size()) - 1; 
  |  
  |          if ((1 == ps_index) && !helper::load_vector_range<T>::process(parameters, r0, r1, 5, 6, 1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          else if (helper::invalid_range(y, r0, r1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          else if (helper::invalid_range(z, r0, r1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |  
  |          const T a = scalar_t(parameters[0])(); 
  |          const T b = scalar_t(parameters[2])(); 
  |  
  |          for (std::size_t i = r0; i <= r1; ++i) 
  |          { 
  |             z[i] = (a * x[i]) + (b * y[i]); 
  |          } 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class axpbsy exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       axpbsy() 
  |       : exprtk::igeneric_function<T>("TVTTV|TVTTVTT") 
  |         /* 
  |            y <- ax + by 
  |            Overloads: 
  |            0. TVTVV   - a, x(vector), b, shift, y(vector), z(vector) 
  |            1. TVTVVTT - a, x(vector), b, shift, y(vector), z(vector), r0, r1 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          const vector_t x(parameters[1]); 
  |                vector_t y(parameters[4]); 
  |  
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = std::min(x.size(),y.size()) - 1; 
  |  
  |          if ((1 == ps_index) && !helper::load_vector_range<T>::process(parameters, r0, r1, 5, 6, 1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          else if (helper::invalid_range(y, r0, r1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |  
  |          const T a = scalar_t(parameters[0])(); 
  |          const T b = scalar_t(parameters[2])(); 
  |  
  |          const std::size_t s = static_cast<std::size_t>(scalar_t(parameters[3])()); 
  |  
  |          for (std::size_t i = r0; i <= r1; ++i) 
  |          { 
  |             y[i] = (a * x[i]) + (b * y[i + s]); 
  |          } 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class axpbsyz exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       axpbsyz() 
  |       : exprtk::igeneric_function<T>("TVTTVV|TVTTVVTT") 
  |         /* 
  |            z <- ax + by 
  |            Overloads: 
  |            0. TVTVV   - a, x(vector), b, shift, y(vector), z(vector) 
  |            1. TVTVVTT - a, x(vector), b, shift, y(vector), z(vector), r0, r1 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          const vector_t x(parameters[1]); 
  |          const vector_t y(parameters[4]); 
  |                vector_t z(parameters[5]); 
  |  
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = std::min(x.size(),y.size()) - 1; 
  |  
  |          if ((1 == ps_index) && !helper::load_vector_range<T>::process(parameters, r0, r1, 6, 7, 1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          else if (helper::invalid_range(y, r0, r1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          else if (helper::invalid_range(z, r0, r1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |  
  |          const T a = scalar_t(parameters[0])(); 
  |          const T b = scalar_t(parameters[2])(); 
  |  
  |          const std::size_t s = static_cast<std::size_t>(scalar_t(parameters[3])()); 
  |  
  |          for (std::size_t i = r0; i <= r1; ++i) 
  |          { 
  |             z[i] = (a * x[i]) + (b * y[i + s]); 
  |          } 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class axpbz exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       axpbz() 
  |       : exprtk::igeneric_function<T>("TVTV|TVTVTT") 
  |         /* 
  |            z <- ax + b 
  |            Overloads: 
  |            0. TVTV   - a, x(vector), b, z(vector) 
  |            1. TVTVTT - a, x(vector), b, z(vector), r0, r1 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          const vector_t x(parameters[1]); 
  |                vector_t z(parameters[3]); 
  |  
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = x.size() - 1; 
  |  
  |          if ((1 == ps_index) && !helper::load_vector_range<T>::process(parameters, r0, r1, 4, 5, 1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          else if (helper::invalid_range(z, r0, r1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |  
  |          const T a = scalar_t(parameters[0])(); 
  |          const T b = scalar_t(parameters[2])(); 
  |  
  |          for (std::size_t i = r0; i <= r1; ++i) 
  |          { 
  |             z[i] = (a * x[i]) + b; 
  |          } 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class diff exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       diff() 
  |       : exprtk::igeneric_function<T>("VV|VVT") 
  |         /* 
  |            x_(i - stride) - x_i 
  |            Overloads: 
  |            0. VV  - x(vector), y(vector) 
  |            1. VVT - x(vector), y(vector), stride 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          const vector_t x(parameters[0]); 
  |                vector_t y(parameters[1]); 
  |  
  |          const std::size_t r0 = 0; 
  |          const std::size_t r1 = std::min(x.size(),y.size()) - 1; 
  |  
  |          const std::size_t stride = (1 != ps_index) ? 1 : 
  |                                     std::min(r1,static_cast<std::size_t>(scalar_t(parameters[2])())); 
  |  
  |          for (std::size_t i = 0; i < stride; ++i) 
  |          { 
  |             y[i] = std::numeric_limits<T>::quiet_NaN(); 
  |          } 
  |  
  |          for (std::size_t i = (r0 + stride); i <= r1; ++i) 
  |          { 
  |             y[i] = x[i] - x[i - stride]; 
  |          } 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class dot exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       dot() 
  |       : exprtk::igeneric_function<T>("VV|VVTT") 
  |         /* 
  |            Overloads: 
  |            0. VV   - x(vector), y(vector) 
  |            1. VVTT - x(vector), y(vector), r0, r1 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          const vector_t x(parameters[0]); 
  |          const vector_t y(parameters[1]); 
  |  
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = std::min(x.size(),y.size()) - 1; 
  |  
  |          if ((1 == ps_index) && !helper::load_vector_range<T>::process(parameters, r0, r1, 2, 3, 0)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          else if (helper::invalid_range(y, r0, r1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |  
  |          T result = T(0); 
  |  
  |          for (std::size_t i = r0; i <= r1; ++i) 
  |          { 
  |             result += (x[i] * y[i]); 
  |          } 
  |  
  |          return result; 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class dotk exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       dotk() 
  |       : exprtk::igeneric_function<T>("VV|VVTT") 
  |         /* 
  |            Overloads: 
  |            0. VV   - x(vector), y(vector) 
  |            1. VVTT - x(vector), y(vector), r0, r1 
  |         */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          const vector_t x(parameters[0]); 
  |          const vector_t y(parameters[1]); 
  |  
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = std::min(x.size(),y.size()) - 1; 
  |  
  |          if ((1 == ps_index) && !helper::load_vector_range<T>::process(parameters, r0, r1, 2, 3, 0)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |          else if (helper::invalid_range(y, r0, r1)) 
  |             return std::numeric_limits<T>::quiet_NaN(); 
  |  
  |          T result = T(0); 
  |          T error  = T(0); 
  |  
  |          for (std::size_t i = r0; i <= r1; ++i) 
  |          { 
  |             details::kahan_sum(result, error, (x[i] * y[i])); 
  |          } 
  |  
  |          return result; 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class threshold_below exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       threshold_below() 
  |       : exprtk::igeneric_function<T>("VTT|VTTTT") 
  |       /* 
  |          Overloads: 
  |          0. VTT   - vector, TV, SV 
  |          1. VTTTT - vector, r0, r1, TV, SV 
  |  
  |          Where: 
  |          TV - Threshold value 
  |          SV - Snap-to value 
  |       */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          vector_t vec(parameters[0]); 
  |  
  |          const T threshold_value = (0 == ps_index) ? 
  |                                    scalar_t(parameters[1]) : 
  |                                    scalar_t(parameters[3]) ; 
  |  
  |          const T snap_value = scalar_t(parameters.back()); 
  |  
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = vec.size() - 1; 
  |  
  |          if ( 
  |               (1 == ps_index) && 
  |               !helper::load_vector_range<T>::process(parameters, r0, r1, 1, 2, 0) 
  |             ) 
  |          { 
  |             return T(0); 
  |          } 
  |  
  |          for (std::size_t i = r0; i <= r1; ++i) 
  |          { 
  |             if (vec[i] < threshold_value) 
  |             { 
  |                vec[i] = snap_value; 
  |             } 
  |          } 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    class threshold_above exprtk_final : public exprtk::igeneric_function<T> 
  |    { 
  |    public: 
  |  
  |       typedef typename exprtk::igeneric_function<T> igfun_t; 
  |       typedef typename igfun_t::parameter_list_t    parameter_list_t; 
  |       typedef typename igfun_t::generic_type        generic_type; 
  |       typedef typename generic_type::scalar_view    scalar_t; 
  |       typedef typename generic_type::vector_view    vector_t; 
  |  
  |       using igfun_t::operator(); 
  |  
  |       threshold_above() 
  |       : exprtk::igeneric_function<T>("VTT|VTTTT") 
  |       /* 
  |          Overloads: 
  |          0. VTT   - vector, TV, SV 
  |          1. VTTTT - vector, r0, r1, TV, SV 
  |  
  |          Where: 
  |          TV - Threshold value 
  |          SV - Snap-to value 
  |       */ 
  |       {} 
  |  
  |       inline T operator() (const std::size_t& ps_index, parameter_list_t parameters) exprtk_override 
  |       { 
  |          vector_t vec(parameters[0]); 
  |  
  |          const T threshold_value = (0 == ps_index) ? 
  |                                    scalar_t(parameters[1]) : 
  |                                    scalar_t(parameters[3]) ; 
  |  
  |          const T snap_value = scalar_t(parameters.back()); 
  |  
  |          std::size_t r0 = 0; 
  |          std::size_t r1 = vec.size() - 1; 
  |  
  |          if ( 
  |               (1 == ps_index) && 
  |               !helper::load_vector_range<T>::process(parameters, r0, r1, 1, 2, 0) 
  |             ) 
  |          { 
  |             return T(0); 
  |          } 
  |  
  |          for (std::size_t i = r0; i <= r1; ++i) 
  |          { 
  |             if (vec[i] > threshold_value) 
  |             { 
  |                vec[i] = snap_value; 
  |             } 
  |          } 
  |  
  |          return T(1); 
  |       } 
  |    }; 
  |  
  |    template <typename T> 
  |    struct package 
  |    { 
  |       all_true       <T> at; 
  |       all_false      <T> af; 
  |       any_true       <T> nt; 
  |       any_false      <T> nf; 
  |       count          <T>  c; 
  |       copy           <T> cp; 
  |       rol            <T> rl; 
  |       ror            <T> rr; 
  |       reverse        <T> rev; 
  |       shift_left     <T> sl; 
  |       shift_right    <T> sr; 
  |       sort           <T> st; 
  |       nthelement     <T> ne; 
  |       assign         <T> an; 
  |       iota           <T> ia; 
  |       sumk           <T> sk; 
  |       axpy           <T> b1_axpy; 
  |       axpby          <T> b1_axpby; 
  |       axpyz          <T> b1_axpyz; 
  |       axpbyz         <T> b1_axpbyz; 
  |       axpbsy         <T> b1_axpbsy; 
  |       axpbsyz        <T> b1_axpbsyz; 
  |       axpbz          <T> b1_axpbz; 
  |       diff           <T> df; 
  |       dot            <T> dt; 
  |       dotk           <T> dtk; 
  |       threshold_above<T> ta; 
  |       threshold_below<T> tb; 
  |  
  |       bool register_package(exprtk::symbol_table<T>& symtab) 
  |       { 
  |          #define exprtk_register_function(FunctionName, FunctionType)                 \ 
  |          if (!symtab.add_function(FunctionName,FunctionType))                         \ 
  |          {                                                                            \ 
  |             exprtk_debug((                                                            \ 
  |               "exprtk::rtl::vecops::register_package - Failed to add function: %s\n", \ 
  |               FunctionName));                                                         \ 
  |             return false;                                                             \ 
  |          }                                                                            \ 
  |  
  |          exprtk_register_function("all_true"        , at        ) 
  |          exprtk_register_function("all_false"       , af        ) 
  |          exprtk_register_function("any_true"        , nt        ) 
  |          exprtk_register_function("any_false"       , nf        ) 
  |          exprtk_register_function("count"           , c         ) 
  |          exprtk_register_function("copy"            , cp        ) 
  |          exprtk_register_function("rotate_left"     , rl        ) 
  |          exprtk_register_function("rol"             , rl        ) 
  |          exprtk_register_function("rotate_right"    , rr        ) 
  |          exprtk_register_function("ror"             , rr        ) 
  |          exprtk_register_function("reverse"         , rev       ) 
  |          exprtk_register_function("shftl"           , sl        ) 
  |          exprtk_register_function("shftr"           , sr        ) 
  |          exprtk_register_function("sort"            , st        ) 
  |          exprtk_register_function("nth_element"     , ne        ) 
  |          exprtk_register_function("assign"          , an        ) 
  |          exprtk_register_function("iota"            , ia        ) 
  |          exprtk_register_function("sumk"            , sk        ) 
  |          exprtk_register_function("axpy"            , b1_axpy   ) 
  |          exprtk_register_function("axpby"           , b1_axpby  ) 
  |          exprtk_register_function("axpyz"           , b1_axpyz  ) 
  |          exprtk_register_function("axpbyz"          , b1_axpbyz ) 
  |          exprtk_register_function("axpbsy"          , b1_axpbsy ) 
  |          exprtk_register_function("axpbsyz"         , b1_axpbsyz) 
  |          exprtk_register_function("axpbz"           , b1_axpbz  ) 
  |          exprtk_register_function("diff"            , df        ) 
  |          exprtk_register_function("dot"             , dt        ) 
  |          exprtk_register_function("dotk"            , dtk       ) 
  |          exprtk_register_function("threshold_above" , ta        ) 
  |          exprtk_register_function("threshold_below" , tb        ) 
  |          #undef exprtk_register_function 
  |  
  |          return true; 
  |       } 
  |    }; 
  |  
  |    } // namespace exprtk::rtl::vecops 
  |    } // namespace exprtk::rtl 
  | }    // namespace exprtk 
  | #endif 
  |  
  | namespace exprtk 
  | { 
  |    namespace information 
  |    { 
  |       using ::exprtk::details::char_cptr; 
  |  
  |       static char_cptr library = "Mathematical Expression Toolkit" 
  |       static char_cptr version = "2.718281828459045235360287471352662497757" 
  |                                  "24709369995957496696762772407663035354759" 
  |                                  "45713821785251664274274663919320030599218" 
  |                                  "17413596629043572900334295260595630738132" 
  |       static char_cptr date    = "20240101" 
  |       static char_cptr min_cpp = "199711L" 
  |  
  |       static inline std::string data() 
  |       { 
  |          static const std::string info_str = std::string(library) + 
  |                                              std::string(" v") + std::string(version) + 
  |                                              std::string(" (") + date + std::string(")") + 
  |                                              std::string(" (") + min_cpp + std::string(")"); 
  |          return info_str; 
  |       } 
  |  
  |    } // namespace information 
  |  
  |    #ifdef exprtk_debug 
  |    #undef exprtk_debug 
  |    #endif 
  |  
  |    #ifdef exprtk_error_location 
  |    #undef exprtk_error_location 
  |    #endif 
  |  
  |    #ifdef exprtk_fallthrough 
  |    #undef exprtk_fallthrough 
  |    #endif 
  |  
  |    #ifdef exprtk_override 
  |    #undef exprtk_override 
  |    #endif 
  |  
  |    #ifdef exprtk_final 
  |    #undef exprtk_final 
  |    #endif 
  |  
  |    #ifdef exprtk_delete 
  |    #undef exprtk_delete 
  |    #endif 
  |  
  | } // namespace exprtk 
  |  
  | #endif