1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef _LIBCPP___TYPE_TRAITS_IS_REFERENCEABLE_H
10#define _LIBCPP___TYPE_TRAITS_IS_REFERENCEABLE_H
11
12#include <__config>
13#include <__type_traits/void_t.h>
14
15#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
16# pragma GCC system_header
17#endif
18
19#if _LIBCPP_STD_VER >= 20
20
21_LIBCPP_BEGIN_NAMESPACE_STD
22
23template <class _Tp>
24concept __referenceable = requires { typename __void_t<_Tp&>; };
25
26_LIBCPP_END_NAMESPACE_STD
27
28#endif
29
30#endif // _LIBCPP___TYPE_TRAITS_IS_REFERENCEABLE_H
31