chromium/base/numerics/wrapping_math.h

// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_NUMERICS_WRAPPING_MATH_H_
#define BASE_NUMERICS_WRAPPING_MATH_H_

#include <type_traits>

namespace base {

// Returns `a + b` with overflow defined to wrap around, i.e. modulo 2^N where N
// is the bit width of `T`.
template <typename T>
inline constexpr T WrappingAdd(T a, T b) { … }

// Returns `a - b` with overflow defined to wrap around, i.e. modulo 2^N where N
// is the bit width of `T`.
template <typename T>
inline constexpr T WrappingSub(T a, T b) { … }

}  // namespace base

#endif  // BASE_NUMERICS_WRAPPING_MATH_H_