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 // To be replaced with std::clamp() from C++17, someday.
14 template <class T>
ClampToRange(const T & value,const T & min,const T & max)15 constexpr const T& ClampToRange(const T& value, const T& min, const T& max) {
16 return std::min(std::max(value, min), max);
17 }
18
19 template <typename T>
IsApproximatelyEqual(T lhs,T rhs,T tolerance)20 constexpr bool IsApproximatelyEqual(T lhs, T rhs, T tolerance) {
21 static_assert(std::is_arithmetic<T>::value, "Argument must be arithmetic");
22 return std::abs(rhs - lhs) <= tolerance;
23 }
24
25 } // namespace base
26
27 #endif // BASE_NUMERICS_RANGES_H_
28