chromium/third_party/libc++/src/include/__type_traits/unwrap_ref.h

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___TYPE_TRAITS_UNWRAP_REF_H
#define _LIBCPP___TYPE_TRAITS_UNWRAP_REF_H

#include <__config>
#include <__fwd/functional.h>
#include <__type_traits/decay.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Tp>
struct __unwrap_reference { … };

__unwrap_reference<reference_wrapper<_Tp>>;

#if _LIBCPP_STD_VER >= 20
template <class _Tp>
struct unwrap_reference : __unwrap_reference<_Tp> { … };

unwrap_reference_t;

template <class _Tp>
struct unwrap_ref_decay : unwrap_reference<__decay_t<_Tp> > { … };

unwrap_ref_decay_t;
#endif // _LIBCPP_STD_VER >= 20

template <class _Tp>
struct __unwrap_ref_decay
#if _LIBCPP_STD_VER >= 20
    : unwrap_ref_decay<_Tp>
#else
    : __unwrap_reference<__decay_t<_Tp> >
#endif
{ … };

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___TYPE_TRAITS_UNWRAP_REF_H