1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP___BIT_BIT_CAST_H
11#define _LIBCPP___BIT_BIT_CAST_H
12
13#include <__config>
14#include <__type_traits/is_trivially_copyable.h>
15
16#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17# pragma GCC system_header
18#endif
19
20_LIBCPP_BEGIN_NAMESPACE_STD
21
22#ifndef _LIBCPP_CXX03_LANG
23
24template <class _ToType, class _FromType>
25[[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI constexpr _ToType __bit_cast(const _FromType& __from) noexcept {
26 return __builtin_bit_cast(_ToType, __from);
27}
28
29#endif // _LIBCPP_CXX03_LANG
30
31#if _LIBCPP_STD_VER >= 20
32
33template <class _ToType, class _FromType>
34 requires(sizeof(_ToType) == sizeof(_FromType) && is_trivially_copyable_v<_ToType> &&
35 is_trivially_copyable_v<_FromType>)
36[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _ToType bit_cast(const _FromType& __from) noexcept {
37 return __builtin_bit_cast(_ToType, __from);
38}
39
40#endif // _LIBCPP_STD_VER >= 20
41
42_LIBCPP_END_NAMESPACE_STD
43
44#endif // _LIBCPP___BIT_BIT_CAST_H
45