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> 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 > 17 23 24 template<class _ToType, class _FromType, class = enable_if_t< 25 sizeof(_ToType) == sizeof(_FromType) && 26 is_trivially_copyable_v<_ToType> && 27 is_trivially_copyable_v<_FromType> 28 >> 29 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI 30 constexpr _ToType bit_cast(_FromType const& __from) noexcept { 31 return __builtin_bit_cast(_ToType, __from); 32 } 33 34 #endif // _LIBCPP_STD_VER > 17 35 36 _LIBCPP_END_NAMESPACE_STD 37 38 #endif // _LIBCPP___BIT_BIT_CAST_H 39