forked from OSchip/llvm-project
120 lines
5.1 KiB
C++
120 lines
5.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ALGORITHM_MOVE_H
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#define _LIBCPP___ALGORITHM_MOVE_H
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#include <__algorithm/iterator_operations.h>
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#include <__algorithm/unwrap_iter.h>
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#include <__config>
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#include <__iterator/iterator_traits.h>
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#include <__iterator/reverse_iterator.h>
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#include <__utility/move.h>
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#include <__utility/pair.h>
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#include <cstring>
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#include <type_traits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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// move
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template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
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pair<_InIter, _OutIter> __move_impl(_InIter __first, _Sent __last, _OutIter __result) {
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while (__first != __last) {
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*__result = _IterOps<_AlgPolicy>::__iter_move(__first);
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++__first;
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++__result;
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}
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return std::make_pair(std::move(__first), std::move(__result));
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}
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template <class _AlgPolicy,
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class _InType,
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class _OutType,
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class = __enable_if_t<is_same<typename remove_const<_InType>::type, _OutType>::value
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&& is_trivially_move_assignable<_OutType>::value> >
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
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pair<_InType*, _OutType*> __move_impl(_InType* __first, _InType* __last, _OutType* __result) {
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if (__libcpp_is_constant_evaluated()
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// TODO: Remove this once GCC supports __builtin_memmove during constant evaluation
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#ifndef _LIBCPP_COMPILER_GCC
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&& !is_trivially_copyable<_InType>::value
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#endif
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)
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return std::__move_impl<_AlgPolicy, _InType*, _InType*, _OutType*>(__first, __last, __result);
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const size_t __n = static_cast<size_t>(__last - __first);
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::__builtin_memmove(__result, __first, __n * sizeof(_OutType));
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return std::make_pair(__first + __n, __result + __n);
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}
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template <class>
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struct __is_trivially_move_assignable_unwrapped_impl : false_type {};
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template <class _Type>
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struct __is_trivially_move_assignable_unwrapped_impl<_Type*> : is_trivially_move_assignable<_Type> {};
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template <class _Iter>
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struct __is_trivially_move_assignable_unwrapped
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: __is_trivially_move_assignable_unwrapped_impl<decltype(std::__unwrap_iter<_Iter>(std::declval<_Iter>()))> {};
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template <class _AlgPolicy,
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class _InIter,
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class _OutIter,
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__enable_if_t<is_same<typename remove_const<typename iterator_traits<_InIter>::value_type>::type,
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typename iterator_traits<_OutIter>::value_type>::value
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&& __is_cpp17_contiguous_iterator<_InIter>::value
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&& __is_cpp17_contiguous_iterator<_OutIter>::value
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&& is_trivially_move_assignable<__iter_value_type<_OutIter> >::value, int> = 0>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17
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pair<reverse_iterator<_InIter>, reverse_iterator<_OutIter> >
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__move_impl(reverse_iterator<_InIter> __first,
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reverse_iterator<_InIter> __last,
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reverse_iterator<_OutIter> __result) {
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auto __first_base = std::__unwrap_iter(__first.base());
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auto __last_base = std::__unwrap_iter(__last.base());
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auto __result_base = std::__unwrap_iter(__result.base());
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auto __result_first = __result_base - (__first_base - __last_base);
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std::__move_impl<_AlgPolicy>(__last_base, __first_base, __result_first);
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return std::make_pair(__last, reverse_iterator<_OutIter>(std::__rewrap_iter(__result.base(), __result_first)));
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}
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template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
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__enable_if_t<is_copy_constructible<_InIter>::value
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&& is_copy_constructible<_Sent>::value
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&& is_copy_constructible<_OutIter>::value, pair<_InIter, _OutIter> >
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__move(_InIter __first, _Sent __last, _OutIter __result) {
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auto __ret = std::__move_impl<_AlgPolicy>(
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std::__unwrap_iter(__first), std::__unwrap_iter(__last), std::__unwrap_iter(__result));
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return std::make_pair(std::__rewrap_iter(__first, __ret.first), std::__rewrap_iter(__result, __ret.second));
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}
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template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
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__enable_if_t<!is_copy_constructible<_InIter>::value
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|| !is_copy_constructible<_Sent>::value
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|| !is_copy_constructible<_OutIter>::value, pair<_InIter, _OutIter> >
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__move(_InIter __first, _Sent __last, _OutIter __result) {
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return std::__move_impl<_AlgPolicy>(std::move(__first), std::move(__last), std::move(__result));
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}
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template <class _InputIterator, class _OutputIterator>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
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_OutputIterator move(_InputIterator __first, _InputIterator __last, _OutputIterator __result) {
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return std::__move<_ClassicAlgPolicy>(__first, __last, __result).second;
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ALGORITHM_MOVE_H
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