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//===----------------------------------------------------------------------===//
//
// 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_ADD_RVALUE_REFERENCE_H
#define _LIBCPP___TYPE_TRAITS_ADD_RVALUE_REFERENCE_H
#include <__config>
#include <__type_traits/is_referenceable.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#if __has_builtin(__add_rvalue_reference)
template <class _Tp>
using __add_rvalue_reference_t = __add_rvalue_reference(_Tp);
#else
template <class _Tp, bool = __libcpp_is_referenceable<_Tp>::value>
struct __add_rvalue_reference_impl {
typedef _LIBCPP_NODEBUG _Tp type;
};
template <class _Tp >
struct __add_rvalue_reference_impl<_Tp, true> {
typedef _LIBCPP_NODEBUG _Tp&& type;
};
template <class _Tp>
using __add_rvalue_reference_t = typename __add_rvalue_reference_impl<_Tp>::type;
#endif // __has_builtin(__add_rvalue_reference)
template <class _Tp>
struct add_rvalue_reference {
using type = __add_rvalue_reference_t<_Tp>;
};
#if _LIBCPP_STD_VER >= 14
template <class _Tp>
using add_rvalue_reference_t = __add_rvalue_reference_t<_Tp>;
#endif
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___TYPE_TRAITS_ADD_RVALUE_REFERENCE_H
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