exprtk_vector_resize_example.cpp File Reference

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

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

Function Documentation

main()

int main

(

)

Definition at line 77 of file exprtk_vector_resize_example.cpp.

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

vector_resize_example()

template<typename T >

void vector_resize_example

(

)

Definition at line 28 of file exprtk_vector_resize_example.cpp.

{
   typedef exprtk::symbol_table<T> symbol_table_t;
   typedef exprtk::expression<T>   expression_t;
   typedef exprtk::parser<T>       parser_t;
 
   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());
 
   T n = T(0);
 
   symbol_table_t symbol_table;
   symbol_table.add_variable("n", n);
   symbol_table.add_vector  ("v", vv);
 
   expression_t expression;
   expression.register_symbol_table(symbol_table);
 
   parser_t parser;
 
   const std::string vector_resize_expression =
      " sum(v) == ((v[]^2 + v[]) / 2) and sum(2v) == (n^2 + n)";
 
   if (!parser.compile(vector_resize_expression, expression))
   {
      printf("Error: %s\tExpression: %s\n",
             parser.error().c_str(),
             vector_resize_expression.c_str());
      return;
   }
 
   for (std::size_t i = 1; i <= vv.base_size(); ++i)
   {
      vv.set_size(i);
      vv.rebase(i % 2 ? v0.data() : v1.data());
 
      n = T(i);
 
      const T result = expression.value();
 
      if (result != T(1))
      {
         printf("Error: vector size: %d\n", static_cast<unsigned int>(i));
      }
   }
}

References exprtk::vector_view< T >::base_size(), exprtk::make_vector_view(), exprtk::vector_view< T >::rebase(), and exprtk::vector_view< T >::set_size().

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