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