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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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52
exprtk_simple_example_04.cpp
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@ -2,8 +2,8 @@
**************************************************************
* C++ Mathematical Expression Toolkit Library *
* *
* Simple Example 4 *
* Author: Arash Partow (1999-2023) *
* Simple Example 04 *
* 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 *
* *
**************************************************************
*/
@ -31,31 +32,32 @@ void fibonacci()
typedef exprtk::function_compositor<T> compositor_t;
typedef typename compositor_t::function function_t;
T x = T(0);
compositor_t compositor;
compositor
.add(
function_t( // define function: fibonacci(x)
"fibonacci",
" var w := 0; "
" var y := 0; "
" var z := 1; "
" switch "
" { "
" case x == 0 : 0; "
" case x == 1 : 1; "
" default : "
" while ((x -= 1) > 0) "
" { "
" w := z; "
" z := z + y; "
" y := w; "
" z "
" }; "
" } ",
"x"));
T x = T(0);
compositor.add(
function_t("fibonacci")
.var("x")
.expression
(
" switch "
" { "
" case x == 0 : 0; "
" case x == 1 : 1; "
" default : "
" { "
" var prev := 0; "
" var curr := 1; "
" while ((x -= 1) > 0) "
" { "
" var temp := prev; "
" prev := curr; "
" curr += temp; "
" }; "
" }; "
" } "
));
symbol_table_t& symbol_table = compositor.symbol_table();
symbol_table.add_constants();