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4e0876ee43
This avoids instantiating multiple classes, reducing compile times. This patch also introduces `__underyling_type_t` for internal use, similar to other type traits.
39 lines
1.1 KiB
C++
39 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/underlying_type.h>
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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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[[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI constexpr __underlying_type_t<_Tp> __to_underlying(_Tp __val) noexcept {
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return static_cast<__underlying_type_t<_Tp>>(__val);
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}
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#endif // !_LIBCPP_CXX03_LANG
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#if _LIBCPP_STD_VER >= 23
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template <class _Tp>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr underlying_type_t<_Tp> to_underlying(_Tp __val) noexcept {
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return std::__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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