| 25 | |
| 26 | template <typename T> |
| 27 | void trig_function() |
| 28 | { |
| 29 | typedef exprtk::symbol_table<T> symbol_table_t; |
| 30 | typedef exprtk::expression<T> expression_t; |
| 31 | typedef exprtk::parser<T> parser_t; |
| 32 | |
| 33 | const std::string expression_string = |
| 34 | "clamp(-1.0, sin(2 * pi * x) + cos(x / 2 * pi), +1.0)"; |
| 35 | |
| 36 | T x; |
| 37 | |
| 38 | symbol_table_t symbol_table; |
| 39 | symbol_table.add_variable("x",x); |
| 40 | symbol_table.add_constants(); |
| 41 | |
| 42 | expression_t expression; |
| 43 | expression.register_symbol_table(symbol_table); |
| 44 | |
| 45 | parser_t parser; |
| 46 | parser.compile(expression_string,expression); |
| 47 | |
| 48 | for (x = T(-5); x <= T(+5); x += T(0.001)) |
| 49 | { |
| 50 | const T y = expression.value(); |
| 51 | printf("%19.15f\t%19.15f\n", x, y); |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | int main() |
| 56 | { |