1*fe6060f1SDimitry Andric // -*- C++ -*- 2*fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 3*fe6060f1SDimitry Andric // 4*fe6060f1SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5*fe6060f1SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 6*fe6060f1SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7*fe6060f1SDimitry Andric // 8*fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 9*fe6060f1SDimitry Andric 10*fe6060f1SDimitry Andric #ifndef _LIBCPP___RANGES_DANGLING_H 11*fe6060f1SDimitry Andric #define _LIBCPP___RANGES_DANGLING_H 12*fe6060f1SDimitry Andric 13*fe6060f1SDimitry Andric #include <__config> 14*fe6060f1SDimitry Andric #include <__ranges/access.h> 15*fe6060f1SDimitry Andric #include <__ranges/concepts.h> 16*fe6060f1SDimitry Andric #include <type_traits> 17*fe6060f1SDimitry Andric 18*fe6060f1SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19*fe6060f1SDimitry Andric #pragma GCC system_header 20*fe6060f1SDimitry Andric #endif 21*fe6060f1SDimitry Andric 22*fe6060f1SDimitry Andric _LIBCPP_PUSH_MACROS 23*fe6060f1SDimitry Andric #include <__undef_macros> 24*fe6060f1SDimitry Andric 25*fe6060f1SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 26*fe6060f1SDimitry Andric 27*fe6060f1SDimitry Andric #if !defined(_LIBCPP_HAS_NO_RANGES) 28*fe6060f1SDimitry Andric 29*fe6060f1SDimitry Andric namespace ranges { 30*fe6060f1SDimitry Andric struct dangling { 31*fe6060f1SDimitry Andric dangling() = default; 32*fe6060f1SDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr dangling(auto&&...) noexcept {} 33*fe6060f1SDimitry Andric }; 34*fe6060f1SDimitry Andric 35*fe6060f1SDimitry Andric template <range _Rp> 36*fe6060f1SDimitry Andric using borrowed_iterator_t = _If<borrowed_range<_Rp>, iterator_t<_Rp>, dangling>; 37*fe6060f1SDimitry Andric 38*fe6060f1SDimitry Andric // borrowed_subrange_t defined in <__ranges/subrange.h> 39*fe6060f1SDimitry Andric } // namespace ranges 40*fe6060f1SDimitry Andric 41*fe6060f1SDimitry Andric #endif // !_LIBCPP_HAS_NO_RANGES 42*fe6060f1SDimitry Andric 43*fe6060f1SDimitry Andric _LIBCPP_END_NAMESPACE_STD 44*fe6060f1SDimitry Andric 45*fe6060f1SDimitry Andric _LIBCPP_POP_MACROS 46*fe6060f1SDimitry Andric 47*fe6060f1SDimitry Andric #endif // _LIBCPP___RANGES_DANGLING_H 48