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/integral_constant.h> 14 #include <__type_traits/is_same.h> 15 16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17 # pragma GCC system_header 18 #endif 19 20 _LIBCPP_BEGIN_NAMESPACE_STD 21 22 struct __is_referenceable_impl { 23 template <class _Tp> static _Tp& __test(int); 24 template <class _Tp> static false_type __test(...); 25 }; 26 27 template <class _Tp> 28 struct __is_referenceable : integral_constant<bool, 29 _IsNotSame<decltype(__is_referenceable_impl::__test<_Tp>(0)), false_type>::value> {}; 30 31 _LIBCPP_END_NAMESPACE_STD 32 33 #endif // _LIBCPP___TYPE_TRAITS_IS_REFERENCEABLE_H 34