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

This commit is contained in:
Arash Partow 2016-10-26 17:01:09 +11:00
parent 6db84b654f
commit fca5cde103
1 changed files with 9 additions and 1 deletions
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10
exprtk_simple_example_05.cpp
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@ -36,6 +36,12 @@ struct myfunc : public exprtk::ifunction<T>
} }
}; };
template <typename T>
inline T myotherfunc(T v0, T v1, T v2)
{
return std::abs(v0 - v1) * v2;
}
template <typename T> template <typename T>
void custom_function() void custom_function()
{ {
@ -43,7 +49,8 @@ void custom_function()
typedef exprtk::expression<T> expression_t; typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t; typedef exprtk::parser<T> parser_t;
std::string expression_string = "myfunc(sin(x * pi), y / 2)"; std::string expression_string =
"myfunc(sin(x / pi), otherfunc(3 * y, x / 2, x * y))";
T x = T(1); T x = T(1);
T y = T(2); T y = T(2);
@ -53,6 +60,7 @@ void custom_function()
symbol_table.add_variable("x",x); symbol_table.add_variable("x",x);
symbol_table.add_variable("y",y); symbol_table.add_variable("y",y);
symbol_table.add_function("myfunc",mf); symbol_table.add_function("myfunc",mf);
symbol_table.add_function("otherfunc",myotherfunc);
symbol_table.add_constants(); symbol_table.add_constants();
expression_t expression; expression_t expression;