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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 file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef DOM_QUOTA_ASSERTIONSIMPL_H_
#define DOM_QUOTA_ASSERTIONSIMPL_H_
#include <type_traits>
#include "mozilla/Assertions.h"
#include "mozilla/dom/quota/Assertions.h"
namespace mozilla::dom::quota {
namespace detail {
template <typename T, bool = std::is_unsigned_v<T>>
struct IntChecker {
static void Assert(T aInt) {
static_assert(std::is_integral_v<T>, "Not an integer!");
MOZ_ASSERT(aInt >= 0);
}
};
template <typename T>
struct IntChecker<T, true> {
static void Assert(T aInt) {
static_assert(std::is_integral_v<T>, "Not an integer!");
}
};
} // namespace detail
template <typename T>
void AssertNoOverflow(uint64_t aDest, T aArg) {
detail::IntChecker<T>::Assert(aDest);
detail::IntChecker<T>::Assert(aArg);
MOZ_ASSERT(UINT64_MAX - aDest >= uint64_t(aArg));
}
template <typename T, typename U>
void AssertNoUnderflow(T aDest, U aArg) {
detail::IntChecker<T>::Assert(aDest);
detail::IntChecker<T>::Assert(aArg);
MOZ_ASSERT(uint64_t(aDest) >= uint64_t(aArg));
}
} // namespace mozilla::dom::quota
#endif // DOM_QUOTA_ASSERTIONSIMPL_H_
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