| 1 | #ifndef LIBCPP_TEST_VALARRAY_HELPER_H |
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| 2 | #define LIBCPP_TEST_VALARRAY_HELPER_H |
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| 3 | |
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| 4 | #include <cmath> |
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| 5 | |
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| 6 | // Returns whether `x` and `y` are equal, up to the given number of |
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| 7 | // significant digits after the decimal. |
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| 8 | // |
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| 9 | // Specifically, we look whether `abs(x - y) < epsilon`, where epsilon |
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| 10 | // is `(1 / 10)^p`, assuming p is the number of digits we care about. |
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| 11 | // This means we're basically looking whether `abs(x - y)` is less |
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| 12 | // than `0.00..001` for some number of digits. |
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| 13 | inline bool is_about(double x, double y, int significant_digits) { |
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| 14 | double epsilon = std::pow(x: 1.0 / 10.0, y: significant_digits); |
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| 15 | return std::abs(x: x - y) < epsilon; |
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| 16 | } |
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| 17 | |
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| 18 | #endif /* LIBCPP_TEST_VALARRAY_HELPER */ |
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| 19 | |
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