1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef _LIBCPP___ITERATOR_MOVE_SENTINEL_H 10 #define _LIBCPP___ITERATOR_MOVE_SENTINEL_H 11 12 #include <__concepts/assignable.h> 13 #include <__concepts/convertible_to.h> 14 #include <__concepts/semiregular.h> 15 #include <__config> 16 #include <__utility/move.h> 17 18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19 # pragma GCC system_header 20 #endif 21 22 _LIBCPP_BEGIN_NAMESPACE_STD 23 24 #if _LIBCPP_STD_VER > 17 25 26 template <semiregular _Sent> 27 class _LIBCPP_TEMPLATE_VIS move_sentinel 28 { 29 public: 30 _LIBCPP_HIDE_FROM_ABI 31 move_sentinel() = default; 32 33 _LIBCPP_HIDE_FROM_ABI constexpr 34 explicit move_sentinel(_Sent __s) : __last_(std::move(__s)) {} 35 36 template <class _S2> 37 requires convertible_to<const _S2&, _Sent> 38 _LIBCPP_HIDE_FROM_ABI constexpr 39 move_sentinel(const move_sentinel<_S2>& __s) : __last_(__s.base()) {} 40 41 template <class _S2> 42 requires assignable_from<_Sent&, const _S2&> 43 _LIBCPP_HIDE_FROM_ABI constexpr 44 move_sentinel& operator=(const move_sentinel<_S2>& __s) 45 { __last_ = __s.base(); return *this; } 46 47 constexpr _Sent base() const { return __last_; } 48 49 private: 50 _Sent __last_ = _Sent(); 51 }; 52 53 #endif // _LIBCPP_STD_VER > 17 54 55 _LIBCPP_END_NAMESPACE_STD 56 57 #endif // _LIBCPP___ITERATOR_MOVE_SENTINEL_H 58