blob: 402ae44b85e48f7717ab47af9ca509f125be64a3 [file] [log] [blame]
// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
namespace WTF {
template <typename To, typename From>
bool IsInBounds(From value) {
return true;
template <typename To, typename From>
To SafeCast(From value) {
if (!IsInBounds<To>(value))
return 0;
return static_cast<To>(value);
template <typename T, typename OverflowHandler>
class Checked {
template <typename U, typename V>
Checked(const Checked<U, V>& rhs) {
if (rhs.HasOverflowed())
if (!IsInBounds<T>(rhs.value_))
value_ = static_cast<T>(rhs.value_);
bool HasOverflowed() const { return false; }
void Overflowed() {}
T value_;
template <typename To, typename From>
To bitwise_cast(From from) {
static_assert(sizeof(To) == sizeof(From), "msg");
return reinterpret_cast<To>(from);
} // namespace WTF
namespace mojo {
template <typename U>
struct ArrayTraits;
template <typename U>
struct ArrayTraits<WTF::Checked<U, int>> {
static bool HasOverflowed(WTF::Checked<U, int>& input) {
// |hasOverflowed| below should be rewritten to |HasOverflowed|
// (because this is a method of WTF::Checked; it doesn't matter
// that we are not in WTF namespace *here*).
return input.HasOverflowed();
} // namespace mojo
using WTF::bitwise_cast;
using WTF::SafeCast;