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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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef _LIBCPP___CXX03___ALGORITHM_MOVE_H10#define _LIBCPP___CXX03___ALGORITHM_MOVE_H11 12#include <__cxx03/__algorithm/copy_move_common.h>13#include <__cxx03/__algorithm/for_each_segment.h>14#include <__cxx03/__algorithm/iterator_operations.h>15#include <__cxx03/__algorithm/min.h>16#include <__cxx03/__config>17#include <__cxx03/__iterator/segmented_iterator.h>18#include <__cxx03/__type_traits/common_type.h>19#include <__cxx03/__type_traits/is_constructible.h>20#include <__cxx03/__utility/move.h>21#include <__cxx03/__utility/pair.h>22 23#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)24# pragma GCC system_header25#endif26 27_LIBCPP_PUSH_MACROS28#include <__cxx03/__undef_macros>29 30_LIBCPP_BEGIN_NAMESPACE_STD31 32template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter>33inline _LIBCPP_HIDE_FROM_ABI pair<_InIter, _OutIter> __move(_InIter __first, _Sent __last, _OutIter __result);34 35template <class _AlgPolicy>36struct __move_impl {37 template <class _InIter, class _Sent, class _OutIter>38 _LIBCPP_HIDE_FROM_ABI pair<_InIter, _OutIter> operator()(_InIter __first, _Sent __last, _OutIter __result) const {39 while (__first != __last) {40 *__result = _IterOps<_AlgPolicy>::__iter_move(__first);41 ++__first;42 ++__result;43 }44 return std::make_pair(std::move(__first), std::move(__result));45 }46 47 template <class _InIter, class _OutIter>48 struct _MoveSegment {49 using _Traits = __segmented_iterator_traits<_InIter>;50 51 _OutIter& __result_;52 53 _LIBCPP_HIDE_FROM_ABI explicit _MoveSegment(_OutIter& __result) : __result_(__result) {}54 55 _LIBCPP_HIDE_FROM_ABI void56 operator()(typename _Traits::__local_iterator __lfirst, typename _Traits::__local_iterator __llast) {57 __result_ = std::__move<_AlgPolicy>(__lfirst, __llast, std::move(__result_)).second;58 }59 };60 61 template <class _InIter, class _OutIter, __enable_if_t<__is_segmented_iterator<_InIter>::value, int> = 0>62 _LIBCPP_HIDE_FROM_ABI pair<_InIter, _OutIter> operator()(_InIter __first, _InIter __last, _OutIter __result) const {63 std::__for_each_segment(__first, __last, _MoveSegment<_InIter, _OutIter>(__result));64 return std::make_pair(__last, std::move(__result));65 }66 67 template <class _InIter,68 class _OutIter,69 __enable_if_t<__has_random_access_iterator_category<_InIter>::value &&70 !__is_segmented_iterator<_InIter>::value && __is_segmented_iterator<_OutIter>::value,71 int> = 0>72 _LIBCPP_HIDE_FROM_ABI pair<_InIter, _OutIter> operator()(_InIter __first, _InIter __last, _OutIter __result) const {73 using _Traits = __segmented_iterator_traits<_OutIter>;74 using _DiffT = typename common_type<__iter_diff_t<_InIter>, __iter_diff_t<_OutIter> >::type;75 76 if (__first == __last)77 return std::make_pair(std::move(__first), std::move(__result));78 79 auto __local_first = _Traits::__local(__result);80 auto __segment_iterator = _Traits::__segment(__result);81 while (true) {82 auto __local_last = _Traits::__end(__segment_iterator);83 auto __size = std::min<_DiffT>(__local_last - __local_first, __last - __first);84 auto __iters = std::__move<_AlgPolicy>(__first, __first + __size, __local_first);85 __first = std::move(__iters.first);86 87 if (__first == __last)88 return std::make_pair(std::move(__first), _Traits::__compose(__segment_iterator, std::move(__iters.second)));89 90 __local_first = _Traits::__begin(++__segment_iterator);91 }92 }93 94 // At this point, the iterators have been unwrapped so any `contiguous_iterator` has been unwrapped to a pointer.95 template <class _In, class _Out, __enable_if_t<__can_lower_move_assignment_to_memmove<_In, _Out>::value, int> = 0>96 _LIBCPP_HIDE_FROM_ABI pair<_In*, _Out*> operator()(_In* __first, _In* __last, _Out* __result) const {97 return std::__copy_trivial_impl(__first, __last, __result);98 }99};100 101template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter>102inline _LIBCPP_HIDE_FROM_ABI pair<_InIter, _OutIter> __move(_InIter __first, _Sent __last, _OutIter __result) {103 return std::__copy_move_unwrap_iters<__move_impl<_AlgPolicy> >(104 std::move(__first), std::move(__last), std::move(__result));105}106 107template <class _InputIterator, class _OutputIterator>108inline _LIBCPP_HIDE_FROM_ABI _OutputIterator109move(_InputIterator __first, _InputIterator __last, _OutputIterator __result) {110 static_assert(is_copy_constructible<_InputIterator>::value, "Iterators has to be copy constructible.");111 static_assert(is_copy_constructible<_OutputIterator>::value, "The output iterator has to be copy constructible.");112 113 return std::__move<_ClassicAlgPolicy>(std::move(__first), std::move(__last), std::move(__result)).second;114}115 116_LIBCPP_END_NAMESPACE_STD117 118_LIBCPP_POP_MACROS119 120#endif // _LIBCPP___CXX03___ALGORITHM_MOVE_H121