chromium/base/bit_cast.h

// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_BIT_CAST_H_
#define BASE_BIT_CAST_H_

#include <type_traits>

namespace base {

// This is an equivalent to C++20's std::bit_cast<>(), but with additional
// warnings. It morally does what `*reinterpret_cast<Dest*>(&source)` does, but
// the cast/deref pair is undefined behavior, while bit_cast<>() isn't.
//
// This is not a magic "get out of UB free" card. This must only be used on
// values, not on references or pointers. For pointers, use
// reinterpret_cast<>(), and then look at https://eel.is/c++draft/basic.lval#11
// as that's probably UB also.

template <class Dest, class Source>
constexpr Dest bit_cast(const Source& source) { … }

}  // namespace base

#endif  // BASE_BIT_CAST_H_