58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
//===----------------------------------------------------------------------===//
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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___FUNCTIONAL_UNWRAP_REF_H
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#define _LIBCPP___FUNCTIONAL_UNWRAP_REF_H
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#include <__config>
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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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template <class _Tp>
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struct __unwrap_reference { typedef _LIBCPP_NODEBUG _Tp type; };
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template <class _Tp>
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class reference_wrapper;
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template <class _Tp>
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struct __unwrap_reference<reference_wrapper<_Tp> > { typedef _LIBCPP_NODEBUG _Tp& type; };
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template <class _Tp>
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struct decay;
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#if _LIBCPP_STD_VER > 17
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template <class _Tp>
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struct unwrap_reference : __unwrap_reference<_Tp> { };
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template <class _Tp>
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using unwrap_reference_t = typename unwrap_reference<_Tp>::type;
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template <class _Tp>
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struct unwrap_ref_decay : unwrap_reference<typename decay<_Tp>::type> { };
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template <class _Tp>
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using unwrap_ref_decay_t = typename unwrap_ref_decay<_Tp>::type;
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#endif // > C++17
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template <class _Tp>
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struct __unwrap_ref_decay
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#if _LIBCPP_STD_VER > 17
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: unwrap_ref_decay<_Tp>
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#else
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: __unwrap_reference<typename decay<_Tp>::type>
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#endif
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{ };
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FUNCTIONAL_UNWRAP_REF_H
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