exprtk_vector_resize_inline_example.cpp File Reference

#include <cstdio>
#include <string>
#include <vector>
#include <map>
#include "exprtk.hpp"

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Classes
class	my_vv_size_handler_t< T >

Functions
template<typename T >
void	vector_inline_resize_example ()
int	main ()

Function Documentation

main()

int main

(

)

Definition at line 145 of file exprtk_vector_resize_inline_example.cpp.

{
   vector_inline_resize_example<double>();
   return 0;
}

vector_inline_resize_example()

template<typename T >

void vector_inline_resize_example

(

)

Definition at line 86 of file exprtk_vector_resize_inline_example.cpp.

{
   typedef exprtk::symbol_table<T> symbol_table_t;
   typedef exprtk::expression<T>   expression_t;
   typedef exprtk::parser<T>       parser_t;
 
   const std::string inline_resize_expression =
      " var vec_original_size := v[];                                     "
      "                                                                   "
      " for (var i := 1; i <= 2 * vec_original_size; i += 1)              "
      " {                                                                 "
      "    if (resize(v,i) == true and v[] == i and sum(2v) == (i^2 + i)) "
      "    {                                                              "
      "       println('Success: set size: ', i ,'  v[] = ', v[]);         "
      "    }                                                              "
      "    else                                                           "
      "    {                                                              "
      "       println('Error: Failed to resize vector v to size: ', i);   "
      "    }                                                              "
      " };                                                                ";
 
   std::vector<T> v0 = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
   std::vector<T> v1 = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
 
   exprtk::vector_view<T> vv = exprtk::make_vector_view(v0, v0.size());
 
 
   exprtk::rtl::io::package<T> io_package;
 
   my_vv_size_handler_t<T> vv_size_handler;
   vv_size_handler.register_vector_view(vv);
 
   symbol_table_t symbol_table;
   symbol_table.add_vector  ("v", vv);
   symbol_table.add_function("resize", vv_size_handler);
   symbol_table.add_package (io_package);
 
   expression_t expression;
   expression.register_symbol_table(symbol_table);
 
   parser_t parser;
 
   if (!parser.compile(inline_resize_expression, expression))
   {
      printf("Error: %s\tExpression: %s\n",
             parser.error().c_str(),
             inline_resize_expression.c_str());
      return;
   }
 
   vv.rebase(v0.data());
   vv_size_handler.register_vector_view(vv);
   expression.value();
 
   vv.rebase(v1.data());
   vv_size_handler.register_vector_view(vv);
   expression.value();
}

References exprtk::make_vector_view(), exprtk::vector_view< T >::rebase(), and my_vv_size_handler_t< T >::register_vector_view().

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