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//===----------------------------------------------------------------------===//
//
// 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
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