| // -*- C++ -*- |
| //===----------------------------------------------------------------------===// |
| // |
| // 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___ITERATOR_CONCEPTS_H |
| #define _LIBCPP___ITERATOR_CONCEPTS_H |
| |
| #include <__config> |
| #include <concepts> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| #pragma GCC system_header |
| #endif |
| |
| _LIBCPP_PUSH_MACROS |
| #include <__undef_macros> |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if !defined(_LIBCPP_HAS_NO_RANGES) |
| |
| template<class _Tp> |
| using __with_reference = _Tp&; |
| |
| template<class _Tp> |
| concept __referenceable = requires { |
| typename __with_reference<_Tp>; |
| }; |
| |
| template<class _Tp> |
| concept __dereferenceable = requires(_Tp& __t) { |
| { *__t } -> __referenceable; // not required to be equality-preserving |
| }; |
| |
| #endif // !defined(_LIBCPP_HAS_NO_RANGES) |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| _LIBCPP_POP_MACROS |
| |
| #endif // _LIBCPP___ITERATOR_CONCEPTS_H |
