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// 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 {
public:
template <typename U, typename V>
Checked(const Checked<U, V>& rhs) {
if (rhs.HasOverflowed())
this->Overflowed();
if (!IsInBounds<T>(rhs.value_))
this->Overflowed();
value_ = static_cast<T>(rhs.value_);
}
bool HasOverflowed() const { return false; }
void Overflowed() {}
private:
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;
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