368faacac7
This commit reverts 5aaefa51 (and also partly 7f285f48e77 and b6d75682f9, which were related to the original commit). As landed, 5aaefa51 had unintended consequences on some downstream bots and didn't have proper coverage upstream due to a few subtle things. Implementing this is something we should do in libc++, however we'll first need to address a few issues listed in https://reviews.llvm.org/D106124#3349710. Differential Revision: https://reviews.llvm.org/D120683
39 lines
1.0 KiB
C++
39 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, class = enable_if_t<
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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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>>
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_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI
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constexpr _ToType bit_cast(_FromType const& __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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