1349cc55cSDimitry Andric // -*- C++ -*- 2349cc55cSDimitry Andric //===----------------------------------------------------------------------===// 3349cc55cSDimitry Andric // 4349cc55cSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5349cc55cSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 6349cc55cSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7349cc55cSDimitry Andric // 8349cc55cSDimitry Andric //===----------------------------------------------------------------------===// 9349cc55cSDimitry Andric 10349cc55cSDimitry Andric #ifndef _LIBCPP___BIT_BIT_CAST_H 11349cc55cSDimitry Andric #define _LIBCPP___BIT_BIT_CAST_H 12349cc55cSDimitry Andric 13349cc55cSDimitry Andric #include <__config> 14bdd1243dSDimitry Andric #include <__type_traits/is_trivially_copyable.h> 15349cc55cSDimitry Andric 16349cc55cSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17349cc55cSDimitry Andric # pragma GCC system_header 18349cc55cSDimitry Andric #endif 19349cc55cSDimitry Andric 20349cc55cSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 21349cc55cSDimitry Andric 22*0fca6ea1SDimitry Andric #ifndef _LIBCPP_CXX03_LANG 23*0fca6ea1SDimitry Andric 24*0fca6ea1SDimitry Andric template <class _ToType, class _FromType> 25*0fca6ea1SDimitry Andric _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI constexpr _ToType __bit_cast(const _FromType& __from) noexcept { 26*0fca6ea1SDimitry Andric return __builtin_bit_cast(_ToType, __from); 27*0fca6ea1SDimitry Andric } 28*0fca6ea1SDimitry Andric 29*0fca6ea1SDimitry Andric #endif // _LIBCPP_CXX03_LANG 30*0fca6ea1SDimitry Andric 3106c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 20 32349cc55cSDimitry Andric 3381ad6265SDimitry Andric template <class _ToType, class _FromType> 34cb14a3feSDimitry Andric requires(sizeof(_ToType) == sizeof(_FromType) && is_trivially_copyable_v<_ToType> && 3581ad6265SDimitry Andric is_trivially_copyable_v<_FromType>) 36*0fca6ea1SDimitry Andric [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _ToType bit_cast(const _FromType& __from) noexcept { 37349cc55cSDimitry Andric return __builtin_bit_cast(_ToType, __from); 38349cc55cSDimitry Andric } 39349cc55cSDimitry Andric 4006c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 20 41349cc55cSDimitry Andric 42349cc55cSDimitry Andric _LIBCPP_END_NAMESPACE_STD 43349cc55cSDimitry Andric 44349cc55cSDimitry Andric #endif // _LIBCPP___BIT_BIT_CAST_H 45