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
41 lines
1.1 KiB
C++
41 lines
1.1 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___UTILITY_TO_UNDERLYING_H
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#define _LIBCPP___UTILITY_TO_UNDERLYING_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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#ifndef _LIBCPP_CXX03_LANG
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template <class _Tp>
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_LIBCPP_INLINE_VISIBILITY constexpr typename underlying_type<_Tp>::type
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__to_underlying(_Tp __val) noexcept {
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return static_cast<typename underlying_type<_Tp>::type>(__val);
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}
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#endif // !_LIBCPP_CXX03_LANG
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#if _LIBCPP_STD_VER > 20
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template <class _Tp>
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_LIBCPP_NODISCARD_EXT _LIBCPP_INLINE_VISIBILITY constexpr underlying_type_t<_Tp>
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to_underlying(_Tp __val) noexcept {
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return _VSTD::__to_underlying(__val);
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}
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#endif
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___UTILITY_TO_UNDERLYING_H
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