exprtk_compilation_timeout.cpp File Reference

#include <chrono>
#include <cstdio>
#include <string>
#include "exprtk.hpp"

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Classes
struct	compilation_timeout_check

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

Function Documentation

compilation_timeout_check_example()

template<typename T >

void compilation_timeout_check_example

(

)

Definition at line 59 of file exprtk_compilation_timeout.cpp.

{
   typedef exprtk::symbol_table<T> symbol_table_t;
   typedef exprtk::expression<T>   expression_t;
   typedef exprtk::parser<T>       parser_t;
 
   const std::string base_expression_string =
      "x := "
      "((1 /1) * sin( 2 * pi * f * t) + (1 /3) * sin( 6 * pi * f * t)+"
      " (1 /5) * sin(10 * pi * f * t) + (1 /7) * sin(14 * pi * f * t)+"
      " (1 /9) * sin(18 * pi * f * t) + (1/11) * sin(22 * pi * f * t)+"
      " (1/13) * sin(26 * pi * f * t) + (1/15) * sin(30 * pi * f * t)+"
      " (1/17) * sin(34 * pi * f * t) + (1/19) * sin(38 * pi * f * t)+"
      " (1/21) * sin(42 * pi * f * t) + (1/23) * sin(46 * pi * f * t)+"
      " (1/25) * sin(50 * pi * f * t) + (1/27) * sin(54 * pi * f * t));";
 
   std::string large_expression_string = "var x := 0;";
 
   for (std::size_t i = 0; i < 60000; ++i)
   {
      large_expression_string += base_expression_string;
   }
 
   static const T pi = T(3.141592653589793238462643383279502);
 
   const T f = pi / T(10);
   const T a = T(10);
         T t = T(0);
 
   symbol_table_t symbol_table;
   symbol_table.add_variable("t",t);
   symbol_table.add_constant("f",f);
   symbol_table.add_constant("a",a);
   symbol_table.add_constants();
 
   expression_t expression;
   expression.register_symbol_table(symbol_table);
 
   compilation_timeout_check compilation_timeout_chck;
 
   parser_t parser;
   parser.register_compilation_timeout_check(compilation_timeout_chck);
 
   const auto max_duration = std::chrono::seconds(8);
   const auto timeout_tp   = std::chrono::steady_clock::now() + max_duration;
   compilation_timeout_chck.set_timeout_time(timeout_tp);
 
   if (!parser.compile(large_expression_string, expression))
   {
      printf("Error: %s\t\n", parser.error().c_str());
      return;
   }
}

References pi, and compilation_timeout_check::set_timeout_time().

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main()

int main

(

)

Definition at line 113 of file exprtk_compilation_timeout.cpp.

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