| // -*- 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___RANGES_DANGLING_H |
| #define _LIBCPP___RANGES_DANGLING_H |
| |
| #include <__config> |
| #include <__ranges/access.h> |
| #include <__ranges/concepts.h> |
| #include <type_traits> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| #pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if !defined(_LIBCPP_HAS_NO_RANGES) |
| |
| namespace ranges { |
| struct dangling { |
| dangling() = default; |
| _LIBCPP_HIDE_FROM_ABI constexpr dangling(auto&&...) noexcept {} |
| }; |
| |
| template <range _Rp> |
| using borrowed_iterator_t = _If<borrowed_range<_Rp>, iterator_t<_Rp>, dangling>; |
| |
| // borrowed_subrange_t defined in <__ranges/subrange.h> |
| } // namespace ranges |
| |
| #endif // !_LIBCPP_HAS_NO_RANGES |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___RANGES_DANGLING_H |