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___ALGORITHM_RANGES_MOVE_BACKWARD_H 10 #define _LIBCPP___ALGORITHM_RANGES_MOVE_BACKWARD_H 11 12 #include <__algorithm/in_out_result.h> 13 #include <__algorithm/ranges_move.h> 14 #include <__config> 15 #include <__iterator/concepts.h> 16 #include <__iterator/iter_move.h> 17 #include <__iterator/next.h> 18 #include <__iterator/reverse_iterator.h> 19 #include <__ranges/access.h> 20 #include <__ranges/concepts.h> 21 #include <__ranges/dangling.h> 22 #include <__utility/move.h> 23 24 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 25 # pragma GCC system_header 26 #endif 27 28 #if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES) 29 30 _LIBCPP_BEGIN_NAMESPACE_STD 31 32 namespace ranges { 33 34 template <class _InIter, class _OutIter> 35 using move_backward_result = in_out_result<_InIter, _OutIter>; 36 37 namespace __move_backward { 38 struct __fn { 39 40 template <class _InIter, class _Sent, class _OutIter> 41 _LIBCPP_HIDE_FROM_ABI constexpr static 42 move_backward_result<_InIter, _OutIter> __move_backward_impl(_InIter __first, _Sent __last, _OutIter __result) { 43 auto __ret = ranges::move(std::make_reverse_iterator(ranges::next(__first, __last)), 44 std::make_reverse_iterator(__first), 45 std::make_reverse_iterator(__result)); 46 return {std::move(__ret.in.base()), std::move(__ret.out.base())}; 47 } 48 49 template <bidirectional_iterator _InIter, sentinel_for<_InIter> _Sent, bidirectional_iterator _OutIter> 50 requires indirectly_movable<_InIter, _OutIter> 51 _LIBCPP_HIDE_FROM_ABI constexpr 52 move_backward_result<_InIter, _OutIter> operator()(_InIter __first, _Sent __last, _OutIter __result) const { 53 return __move_backward_impl(std::move(__first), std::move(__last), std::move(__result)); 54 } 55 56 template <bidirectional_range _Range, bidirectional_iterator _Iter> 57 requires indirectly_movable<iterator_t<_Range>, _Iter> 58 _LIBCPP_HIDE_FROM_ABI constexpr 59 move_backward_result<borrowed_iterator_t<_Range>, _Iter> operator()(_Range&& __range, _Iter __result) const { 60 return __move_backward_impl(ranges::begin(__range), ranges::end(__range), std::move(__result)); 61 } 62 63 }; 64 } // namespace __move_backward 65 66 inline namespace __cpo { 67 inline constexpr auto move_backward = __move_backward::__fn{}; 68 } // namespace __cpo 69 } // namespace ranges 70 71 _LIBCPP_END_NAMESPACE_STD 72 73 #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES) 74 75 #endif // _LIBCPP___ALGORITHM_RANGES_MOVE_BACKWARD_H 76