ranges.h (1255B)
1 // Copyright 2017 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef BASE_NUMERICS_RANGES_H_ 6 #define BASE_NUMERICS_RANGES_H_ 7 8 #include <algorithm> 9 #include <cmath> 10 11 namespace base 12 { 13 14 // DO NOT USE THIS FUNCTION. IT IS DUE TO BE REMOVED. https://crbug.com/1231569 15 // Please use base::clamp() from base/cxx17_backports.h instead. 16 // 17 // This function, unlike base::clamp(), does not check if `min` is greater than 18 // `max`, and returns a bogus answer if it is. Please migrate all code that 19 // calls this function to use base::clamp() instead. 20 // 21 // If, for some reason the broken behavior is required, please re-create this 22 // min/max nesting inline in the host code and explain with a comment why it 23 // is needed. 24 template <class T> 25 constexpr const T &BrokenClampThatShouldNotBeUsed(const T &value, const T &min, const T &max) 26 { 27 return std::min(std::max(value, min), max); 28 } 29 30 template <typename T> 31 constexpr bool IsApproximatelyEqual(T lhs, T rhs, T tolerance) 32 { 33 static_assert(std::is_arithmetic<T>::value, "Argument must be arithmetic"); 34 return std::abs(rhs - lhs) <= tolerance; 35 } 36 37 } // namespace base 38 39 #endif // BASE_NUMERICS_RANGES_H_