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 #if _LIBCPP_STD_VER >= 20
23 
24 template <class _ToType, class _FromType>
25   requires(sizeof(_ToType) == sizeof(_FromType) && is_trivially_copyable_v<_ToType> &&
26            is_trivially_copyable_v<_FromType>)
27 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr _ToType bit_cast(const _FromType& __from) noexcept {
28   return __builtin_bit_cast(_ToType, __from);
29 }
30 
31 #endif // _LIBCPP_STD_VER >= 20
32 
33 _LIBCPP_END_NAMESPACE_STD
34 
35 #endif // _LIBCPP___BIT_BIT_CAST_H
36