| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___ALGORITHM_MOVE_H |
| #define _LIBCPP___ALGORITHM_MOVE_H |
| |
| #include <__algorithm/copy_move_common.h> |
| #include <__algorithm/for_each_segment.h> |
| #include <__algorithm/iterator_operations.h> |
| #include <__algorithm/min.h> |
| #include <__config> |
| #include <__iterator/segmented_iterator.h> |
| #include <__type_traits/common_type.h> |
| #include <__type_traits/is_copy_constructible.h> |
| #include <__utility/move.h> |
| #include <__utility/pair.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_PUSH_MACROS |
| #include <__undef_macros> |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter> |
| __move(_InIter __first, _Sent __last, _OutIter __result); |
| |
| template <class _AlgPolicy> |
| struct __move_loop { |
| template <class _InIter, class _Sent, class _OutIter> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter> |
| operator()(_InIter __first, _Sent __last, _OutIter __result) const { |
| while (__first != __last) { |
| *__result = _IterOps<_AlgPolicy>::__iter_move(__first); |
| ++__first; |
| ++__result; |
| } |
| return std::make_pair(std::move(__first), std::move(__result)); |
| } |
| |
| template <class _InIter, class _OutIter> |
| struct _MoveSegment { |
| using _Traits = __segmented_iterator_traits<_InIter>; |
| |
| _OutIter& __result_; |
| |
| _LIBCPP_HIDE_FROM_ABI _MoveSegment(_OutIter& __result) : __result_(__result) {} |
| |
| _LIBCPP_HIDE_FROM_ABI void |
| operator()(typename _Traits::__local_iterator __lfirst, typename _Traits::__local_iterator __llast) { |
| __result_ = std::__move<_AlgPolicy>(__lfirst, __llast, std::move(__result_)).second; |
| } |
| }; |
| |
| template <class _InIter, class _OutIter, __enable_if_t<__is_segmented_iterator<_InIter>::value, int> = 0> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter> |
| operator()(_InIter __first, _InIter __last, _OutIter __result) const { |
| std::__for_each_segment(__first, __last, _MoveSegment<_InIter, _OutIter>(__result)); |
| return std::make_pair(__last, std::move(__result)); |
| } |
| |
| template <class _InIter, |
| class _OutIter, |
| __enable_if_t<__has_random_access_iterator_category<_InIter>::value && |
| !__is_segmented_iterator<_InIter>::value && __is_segmented_iterator<_OutIter>::value, |
| int> = 0> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter> |
| operator()(_InIter __first, _InIter __last, _OutIter __result) const { |
| using _Traits = __segmented_iterator_traits<_OutIter>; |
| using _DiffT = typename common_type<__iter_diff_t<_InIter>, __iter_diff_t<_OutIter> >::type; |
| |
| if (__first == __last) |
| return std::make_pair(std::move(__first), std::move(__result)); |
| |
| auto __local_first = _Traits::__local(__result); |
| auto __segment_iterator = _Traits::__segment(__result); |
| while (true) { |
| auto __local_last = _Traits::__end(__segment_iterator); |
| auto __size = std::min<_DiffT>(__local_last - __local_first, __last - __first); |
| auto __iters = std::__move<_AlgPolicy>(__first, __first + __size, __local_first); |
| __first = std::move(__iters.first); |
| |
| if (__first == __last) |
| return std::make_pair(std::move(__first), _Traits::__compose(__segment_iterator, std::move(__iters.second))); |
| |
| __local_first = _Traits::__begin(++__segment_iterator); |
| } |
| } |
| }; |
| |
| struct __move_trivial { |
| // At this point, the iterators have been unwrapped so any `contiguous_iterator` has been unwrapped to a pointer. |
| template <class _In, class _Out, |
| __enable_if_t<__can_lower_move_assignment_to_memmove<_In, _Out>::value, int> = 0> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_In*, _Out*> |
| operator()(_In* __first, _In* __last, _Out* __result) const { |
| return std::__copy_trivial_impl(__first, __last, __result); |
| } |
| }; |
| |
| template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter> |
| __move(_InIter __first, _Sent __last, _OutIter __result) { |
| return std::__dispatch_copy_or_move<_AlgPolicy, __move_loop<_AlgPolicy>, __move_trivial>( |
| std::move(__first), std::move(__last), std::move(__result)); |
| } |
| |
| template <class _InputIterator, class _OutputIterator> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator |
| move(_InputIterator __first, _InputIterator __last, _OutputIterator __result) { |
| static_assert(is_copy_constructible<_InputIterator>::value, "Iterators has to be copy constructible."); |
| static_assert(is_copy_constructible<_OutputIterator>::value, "The output iterator has to be copy constructible."); |
| |
| return std::__move<_ClassicAlgPolicy>(std::move(__first), std::move(__last), std::move(__result)).second; |
| } |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| _LIBCPP_POP_MACROS |
| |
| #endif // _LIBCPP___ALGORITHM_MOVE_H |