зеркало из https://github.com/mozilla/gecko-dev.git
53 строки
1.4 KiB
C
53 строки
1.4 KiB
C
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef DOM_QUOTA_ASSERTIONSIMPL_H_
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#define DOM_QUOTA_ASSERTIONSIMPL_H_
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#include "mozilla/dom/quota/Assertions.h"
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#include <type_traits>
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#include "mozilla/Assertions.h"
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namespace mozilla::dom::quota {
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namespace detail {
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template <typename T, bool = std::is_unsigned_v<T>>
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struct IntChecker {
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static void Assert(T aInt) {
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static_assert(std::is_integral_v<T>, "Not an integer!");
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MOZ_ASSERT(aInt >= 0);
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}
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};
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template <typename T>
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struct IntChecker<T, true> {
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static void Assert(T aInt) {
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static_assert(std::is_integral_v<T>, "Not an integer!");
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}
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};
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} // namespace detail
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template <typename T>
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void AssertNoOverflow(uint64_t aDest, T aArg) {
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detail::IntChecker<T>::Assert(aDest);
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detail::IntChecker<T>::Assert(aArg);
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MOZ_ASSERT(UINT64_MAX - aDest >= uint64_t(aArg));
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}
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template <typename T, typename U>
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void AssertNoUnderflow(T aDest, U aArg) {
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detail::IntChecker<T>::Assert(aDest);
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detail::IntChecker<T>::Assert(aArg);
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MOZ_ASSERT(uint64_t(aDest) >= uint64_t(aArg));
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}
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} // namespace mozilla::dom::quota
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#endif // DOM_QUOTA_ASSERTIONSIMPL_H_
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