| #ifndef LIBCPP_TEST_VALARRAY_HELPER_H |
| #define LIBCPP_TEST_VALARRAY_HELPER_H |
| |
| #include <cmath> |
| |
| // Returns whether `x` and `y` are equal, up to the given number of |
| // significant digits after the decimal. |
| // |
| // Specifically, we look whether `abs(x - y) < epsilon`, where epsilon |
| // is `(1 / 10)^p`, assuming p is the number of digits we care about. |
| // This means we're basically looking whether `abs(x - y)` is less |
| // than `0.00..001` for some number of digits. |
| inline bool is_about(double x, double y, int significant_digits) { |
| double epsilon = std::pow(1.0 / 10.0, significant_digits); |
| return std::abs(x - y) < epsilon; |
| } |
| |
| #endif /* LIBCPP_TEST_VALARRAY_HELPER */ |
