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) && 26 is_trivially_copyable_v<_ToType> && 27 is_trivially_copyable_v<_FromType>) 28 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr _ToType bit_cast(const _FromType& __from) noexcept { 29 return __builtin_bit_cast(_ToType, __from); 30 } 31 32 #endif // _LIBCPP_STD_VER >= 20 33 34 _LIBCPP_END_NAMESPACE_STD 35 36 #endif // _LIBCPP___BIT_BIT_CAST_H 37