| 46 | |
| 47 | template <typename T> |
| 48 | void custom_function() |
| 49 | { |
| 50 | typedef exprtk::symbol_table<T> symbol_table_t; |
| 51 | typedef exprtk::expression<T> expression_t; |
| 52 | typedef exprtk::parser<T> parser_t; |
| 53 | |
| 54 | const std::string expression_string = |
| 55 | "myfunc(sin(x / pi), otherfunc(3 * y, x / 2, x * y))"; |
| 56 | |
| 57 | T x = T(1); |
| 58 | T y = T(2); |
| 59 | myfunc<T> mf; |
| 60 | |
| 61 | symbol_table_t symbol_table; |
| 62 | symbol_table.add_variable("x",x); |
| 63 | symbol_table.add_variable("y",y); |
| 64 | symbol_table.add_function("myfunc",mf); |
| 65 | symbol_table.add_function("otherfunc",myotherfunc); |
| 66 | symbol_table.add_constants(); |
| 67 | |
| 68 | expression_t expression; |
| 69 | expression.register_symbol_table(symbol_table); |
| 70 | |
| 71 | parser_t parser; |
| 72 | parser.compile(expression_string,expression); |
| 73 | |
| 74 | const T result = expression.value(); |
| 75 | printf("Result: %10.5f\n",result); |
| 76 | } |
| 77 | |
| 78 | int main() |
| 79 | { |