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23b10a4a66
All supported compilers have concepts support so use that in the C++20 functions in <bit>. s/_LIBCPP_INLINE_VISIBILITY/_LIBCPP_HIDE_FROM_ABI/ as drive-by fix. Reviewed By: #libc, ldionne Differential Revision: https://reviews.llvm.org/D127594
37 lines
1.0 KiB
C++
37 lines
1.0 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___BIT_BIT_CAST_H
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#define _LIBCPP___BIT_BIT_CAST_H
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#include <__config>
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#include <type_traits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER > 17
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template <class _ToType, class _FromType>
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requires(sizeof(_ToType) == sizeof(_FromType) &&
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is_trivially_copyable_v<_ToType> &&
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is_trivially_copyable_v<_FromType>)
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_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr _ToType bit_cast(const _FromType& __from) noexcept {
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return __builtin_bit_cast(_ToType, __from);
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}
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#endif // _LIBCPP_STD_VER > 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___BIT_BIT_CAST_H
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