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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
/* Provides checked integers operations, detecting overflow. */
#ifndef mozilla_CheckedArithmetic_h
#define mozilla_CheckedArithmetic_h
namespace mozilla {
template <typename T>
[[nodiscard]] constexpr bool SafeAdd(T lhs, T rhs, T* res) {
return !__builtin_add_overflow(lhs, rhs, res);
}
template <typename T>
[[nodiscard]] constexpr bool SafeSub(T lhs, T rhs, T* res) {
return !__builtin_sub_overflow(lhs, rhs, res);
}
template <typename T>
[[nodiscard]] constexpr bool SafeMul(T lhs, T rhs, T* res) {
return !__builtin_mul_overflow(lhs, rhs, res);
}
} // namespace mozilla
#endif /* mozilla_CheckedArithmetic_h */