181ad6265SDimitry Andric //===----------------------------------------------------------------------===// 281ad6265SDimitry Andric // 381ad6265SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 481ad6265SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 581ad6265SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 681ad6265SDimitry Andric // 781ad6265SDimitry Andric //===----------------------------------------------------------------------===// 881ad6265SDimitry Andric 981ad6265SDimitry Andric #ifndef _LIBCPP___ITERATOR_MOVE_SENTINEL_H 1081ad6265SDimitry Andric #define _LIBCPP___ITERATOR_MOVE_SENTINEL_H 1181ad6265SDimitry Andric 1281ad6265SDimitry Andric #include <__concepts/assignable.h> 1381ad6265SDimitry Andric #include <__concepts/convertible_to.h> 1481ad6265SDimitry Andric #include <__concepts/semiregular.h> 1581ad6265SDimitry Andric #include <__config> 1681ad6265SDimitry Andric #include <__utility/move.h> 1781ad6265SDimitry Andric 1881ad6265SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 1981ad6265SDimitry Andric # pragma GCC system_header 2081ad6265SDimitry Andric #endif 2181ad6265SDimitry Andric 2206c3fb27SDimitry Andric _LIBCPP_PUSH_MACROS 2306c3fb27SDimitry Andric #include <__undef_macros> 2406c3fb27SDimitry Andric 2581ad6265SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 2681ad6265SDimitry Andric 2706c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 20 2881ad6265SDimitry Andric 2981ad6265SDimitry Andric template <semiregular _Sent> 30*cb14a3feSDimitry Andric class _LIBCPP_TEMPLATE_VIS move_sentinel { 3181ad6265SDimitry Andric public: 32*cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI move_sentinel() = default; 3381ad6265SDimitry Andric 34*cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr explicit move_sentinel(_Sent __s) : __last_(std::move(__s)) {} 3581ad6265SDimitry Andric 3681ad6265SDimitry Andric template <class _S2> 3781ad6265SDimitry Andric requires convertible_to<const _S2&, _Sent> 38*cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr move_sentinel(const move_sentinel<_S2>& __s) : __last_(__s.base()) {} 3981ad6265SDimitry Andric 4081ad6265SDimitry Andric template <class _S2> 4181ad6265SDimitry Andric requires assignable_from<_Sent&, const _S2&> 42*cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr move_sentinel& operator=(const move_sentinel<_S2>& __s) { 43*cb14a3feSDimitry Andric __last_ = __s.base(); 44*cb14a3feSDimitry Andric return *this; 45*cb14a3feSDimitry Andric } 4681ad6265SDimitry Andric 4706c3fb27SDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr _Sent base() const { return __last_; } 4881ad6265SDimitry Andric 4981ad6265SDimitry Andric private: 5081ad6265SDimitry Andric _Sent __last_ = _Sent(); 5181ad6265SDimitry Andric }; 5281ad6265SDimitry Andric 53bdd1243dSDimitry Andric _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(move_sentinel); 54bdd1243dSDimitry Andric 5506c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 20 5681ad6265SDimitry Andric 5781ad6265SDimitry Andric _LIBCPP_END_NAMESPACE_STD 5881ad6265SDimitry Andric 5906c3fb27SDimitry Andric _LIBCPP_POP_MACROS 6006c3fb27SDimitry Andric 6181ad6265SDimitry Andric #endif // _LIBCPP___ITERATOR_MOVE_SENTINEL_H 62