1fe6060f1SDimitry Andric // -*- C++ -*- 2fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 3fe6060f1SDimitry Andric // 4fe6060f1SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5fe6060f1SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 6fe6060f1SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7fe6060f1SDimitry Andric // 8fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 9fe6060f1SDimitry Andric 10fe6060f1SDimitry Andric #ifndef _LIBCPP___RANGES_DANGLING_H 11fe6060f1SDimitry Andric #define _LIBCPP___RANGES_DANGLING_H 12fe6060f1SDimitry Andric 13fe6060f1SDimitry Andric #include <__config> 14fe6060f1SDimitry Andric #include <__ranges/access.h> 15fe6060f1SDimitry Andric #include <__ranges/concepts.h> 16bdd1243dSDimitry Andric #include <__type_traits/conditional.h> 17fe6060f1SDimitry Andric 18fe6060f1SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19fe6060f1SDimitry Andric # pragma GCC system_header 20fe6060f1SDimitry Andric #endif 21fe6060f1SDimitry Andric 22fe6060f1SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 23fe6060f1SDimitry Andric 24*06c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 20 25fe6060f1SDimitry Andric 26fe6060f1SDimitry Andric namespace ranges { 27fe6060f1SDimitry Andric struct dangling { 28fe6060f1SDimitry Andric dangling() = default; danglingdangling29fe6060f1SDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr dangling(auto&&...) noexcept {} 30fe6060f1SDimitry Andric }; 31fe6060f1SDimitry Andric 32fe6060f1SDimitry Andric template <range _Rp> 33fe6060f1SDimitry Andric using borrowed_iterator_t = _If<borrowed_range<_Rp>, iterator_t<_Rp>, dangling>; 34fe6060f1SDimitry Andric 35fe6060f1SDimitry Andric // borrowed_subrange_t defined in <__ranges/subrange.h> 36fe6060f1SDimitry Andric } // namespace ranges 37fe6060f1SDimitry Andric 38*06c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 20 39fe6060f1SDimitry Andric 40fe6060f1SDimitry Andric _LIBCPP_END_NAMESPACE_STD 41fe6060f1SDimitry Andric 42fe6060f1SDimitry Andric #endif // _LIBCPP___RANGES_DANGLING_H 43