| //===----------------------------------------------------------------------===// |
| // |
| // 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_IS_REFERENCEABLE_H |
| #define _LIBCPP___TYPE_TRAITS_IS_REFERENCEABLE_H |
| |
| #include <__config> |
| #include <__type_traits/integral_constant.h> |
| #include <__type_traits/is_same.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if __has_builtin(__is_referenceable) |
| template <class _Tp> |
| struct __libcpp_is_referenceable : integral_constant<bool, __is_referenceable(_Tp)> {}; |
| #else |
| struct __libcpp_is_referenceable_impl { |
| template <class _Tp> |
| static _Tp& __test(int); |
| template <class _Tp> |
| static false_type __test(...); |
| }; |
| |
| template <class _Tp> |
| struct __libcpp_is_referenceable |
| : integral_constant<bool, _IsNotSame<decltype(__libcpp_is_referenceable_impl::__test<_Tp>(0)), false_type>::value> { |
| }; |
| #endif // __has_builtin(__is_referenceable) |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___TYPE_TRAITS_IS_REFERENCEABLE_H |
