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C++ Mathematical Expression Library (ExprTk) https://www.partow.net/programming/exprtk/index.html

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ArashPartow
2024-01-01 00:00:00 +00:00
committed by Arash Partow
parent f46bffcd69
commit cc1b800c2b
33 changed files with 67415 additions and 54230 deletions
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27
exprtk_simple_example_08.cpp
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@ -2,8 +2,8 @@
**************************************************************
* C++ Mathematical Expression Toolkit Library *
* *
* Simple Example 8 *
* Author: Arash Partow (1999-2023) *
* Simple Example 08 *
* Author: Arash Partow (1999-2024) *
* URL: https://www.partow.net/programming/exprtk/index.html *
* *
* Copyright notice: *
@ -11,6 +11,7 @@
* 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 *
* *
**************************************************************
*/
@ -28,27 +29,29 @@ void composite()
typedef exprtk::symbol_table<T> symbol_table_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
typedef exprtk::parser_error::type error_t;
typedef exprtk::parser_error::type err_t;
typedef exprtk::function_compositor<T> compositor_t;
typedef typename compositor_t::function function_t;
compositor_t compositor;
T x = T(1);
T y = T(2);
compositor_t compositor;
symbol_table_t& symbol_table = compositor.symbol_table();
symbol_table.add_constants();
symbol_table.add_variable("x",x);
symbol_table.add_variable("y",y);
compositor
.add(
function_t("f","sin(x / pi)","x")); // f(x) = sin(x / pi)
compositor.add(
function_t("f") // f(x) = sin(x / pi)
.var("x")
.expression( "sin(x / pi)" ));
compositor
.add(
function_t("g","3*[f(x) + f(y)]","x","y")); // g(x,y) = 3[f(x) + f(y)]
compositor.add(
function_t("g") // g(x,y) = 3[f(x) + f(y)]
.vars("x", "y")
.expression( "3*[f(x) + f(y)]" ));
std::string expression_string = "g(1 + f(x), f(y) / 2)";
@ -65,7 +68,7 @@ void composite()
for (std::size_t i = 0; i < parser.error_count(); ++i)
{
const error_t error = parser.get_error(i);
const err_t error = parser.get_error(i);
printf("Error: %02d Position: %02d Type: [%14s] Msg: %s\tExpression: %s\n",
static_cast<unsigned int>(i),