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109 lines (87 loc) · 3.21 KB
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/*
**************************************************************
* C++ Mathematical Expression Toolkit Library *
* *
* Simple Example 20 *
* Author: Arash Partow (1999-2024) *
* URL: https://www.partow.net/programming/exprtk/index.html *
* *
* Copyright notice: *
* Free use of the 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 *
* *
**************************************************************
*/
#include <cstdio>
#include <stdexcept>
#include <map>
#include <string>
#include "exprtk.hpp"
struct vector_access_rtc : public exprtk::vector_access_runtime_check
{
typedef std::map<void*, std::string> map_t;
map_t vector_map;
bool handle_runtime_violation(violation_context& context)
{
const map_t::iterator itr = vector_map.find(static_cast<void*>(context.base_ptr));
std::string vector_name = (itr != vector_map.end()) ?
itr->second : "Unknown" ;
printf("Runtime vector access violation\n"
"Vector: %s base: %p end: %p access: %p typesize: %d\n",
vector_name.c_str(),
context.base_ptr ,
context.end_ptr ,
context.access_ptr ,
static_cast<unsigned int>(context.type_size));
throw std::runtime_error
("Runtime vector access violation. Vector: " + vector_name);
return false;
}
};
template <typename T>
void vector_overflow_example()
{
typedef exprtk::symbol_table<T> symbol_table_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
const std::string expression_str =
" for (var i := 0; i < max(v0[],v1[]); i += 1) "
" { "
" v0[i] := (2 * v0[i]) + (v1[i] / 3); "
" } ";
T v0[5 ] = { 0, 1, 2, 3, 4 };
T v1[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
vector_access_rtc vec_rtc;
vec_rtc.vector_map[v0] = "v0";
vec_rtc.vector_map[v1] = "v1";
symbol_table_t symbol_table;
expression_t expression;
parser_t parser;
symbol_table.add_vector("v0", v0);
symbol_table.add_vector("v1", v1);
expression.register_symbol_table(symbol_table);
parser.register_vector_access_runtime_check(vec_rtc);
try
{
if (!parser.compile(expression_str, expression))
{
printf("Error: %s\tExpression: %s\n",
parser.error().c_str(),
expression_str.c_str());
return;
}
expression.value();
}
catch(std::runtime_error& exception)
{
printf("Exception: %s\n",exception.what());
}
}
int main()
{
vector_overflow_example<double>();
return 0;
}