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| 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 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 20 | |
| 21 | template <class _Tp, class = void> |
| 22 | inline const bool __is_referenceable_v = false; |
| 23 | |
| 24 | template <class _Tp> |
| 25 | inline const bool __is_referenceable_v<_Tp, __void_t<_Tp&> > = true; |
| 26 | |
| 27 | #if _LIBCPP_STD_VER >= 20 |
| 28 | template <class _Tp> |
| 29 | concept __referenceable = __is_referenceable_v<_Tp>; |
| 30 | #endif |
| 31 | |
| 32 | _LIBCPP_END_NAMESPACE_STD |
| 33 | |
| 34 | #endif // _LIBCPP___TYPE_TRAITS_IS_REFERENCEABLE_H |
| 35 |
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