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_COPY_H 10 #define _LIBCPP___ALGORITHM_COPY_H 11 12 #include <__algorithm/copy_move_common.h> 13 #include <__algorithm/for_each_segment.h> 14 #include <__algorithm/iterator_operations.h> 15 #include <__algorithm/min.h> 16 #include <__config> 17 #include <__iterator/segmented_iterator.h> 18 #include <__type_traits/common_type.h> 19 #include <__utility/move.h> 20 #include <__utility/pair.h> 21 22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 23 # pragma GCC system_header 24 #endif 25 26 _LIBCPP_PUSH_MACROS 27 #include <__undef_macros> 28 29 _LIBCPP_BEGIN_NAMESPACE_STD 30 31 template <class, class _InIter, class _Sent, class _OutIter> 32 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter> __copy(_InIter, _Sent, _OutIter); 33 34 template <class _AlgPolicy> 35 struct __copy_loop { 36 template <class _InIter, class _Sent, class _OutIter> 37 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter> 38 operator()(_InIter __first, _Sent __last, _OutIter __result) const { 39 while (__first != __last) { 40 *__result = *__first; 41 ++__first; 42 ++__result; 43 } 44 45 return std::make_pair(std::move(__first), std::move(__result)); 46 } 47 48 template <class _InIter, class _OutIter> 49 struct _CopySegment { 50 using _Traits = __segmented_iterator_traits<_InIter>; 51 52 _OutIter& __result_; 53 54 _LIBCPP_HIDE_FROM_ABI _CopySegment(_OutIter& __result) : __result_(__result) {} 55 56 _LIBCPP_HIDE_FROM_ABI void 57 operator()(typename _Traits::__local_iterator __lfirst, typename _Traits::__local_iterator __llast) { 58 __result_ = std::__copy<_AlgPolicy>(__lfirst, __llast, std::move(__result_)).second; 59 } 60 }; 61 62 template <class _InIter, class _OutIter, __enable_if_t<__is_segmented_iterator<_InIter>::value, int> = 0> 63 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter> 64 operator()(_InIter __first, _InIter __last, _OutIter __result) const { 65 std::__for_each_segment(__first, __last, _CopySegment<_InIter, _OutIter>(__result)); 66 return std::make_pair(__last, std::move(__result)); 67 } 68 69 template <class _InIter, 70 class _OutIter, 71 __enable_if_t<__has_random_access_iterator_category<_InIter>::value && 72 !__is_segmented_iterator<_InIter>::value && __is_segmented_iterator<_OutIter>::value, 73 int> = 0> 74 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter> 75 operator()(_InIter __first, _InIter __last, _OutIter __result) const { 76 using _Traits = __segmented_iterator_traits<_OutIter>; 77 using _DiffT = typename common_type<__iter_diff_t<_InIter>, __iter_diff_t<_OutIter> >::type; 78 79 if (__first == __last) 80 return std::make_pair(std::move(__first), std::move(__result)); 81 82 auto __local_first = _Traits::__local(__result); 83 auto __segment_iterator = _Traits::__segment(__result); 84 while (true) { 85 auto __local_last = _Traits::__end(__segment_iterator); 86 auto __size = std::min<_DiffT>(__local_last - __local_first, __last - __first); 87 auto __iters = std::__copy<_AlgPolicy>(__first, __first + __size, __local_first); 88 __first = std::move(__iters.first); 89 90 if (__first == __last) 91 return std::make_pair(std::move(__first), _Traits::__compose(__segment_iterator, std::move(__iters.second))); 92 93 __local_first = _Traits::__begin(++__segment_iterator); 94 } 95 } 96 }; 97 98 struct __copy_trivial { 99 // At this point, the iterators have been unwrapped so any `contiguous_iterator` has been unwrapped to a pointer. 100 template <class _In, class _Out, __enable_if_t<__can_lower_copy_assignment_to_memmove<_In, _Out>::value, int> = 0> 101 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_In*, _Out*> 102 operator()(_In* __first, _In* __last, _Out* __result) const { 103 return std::__copy_trivial_impl(__first, __last, __result); 104 } 105 }; 106 107 template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter> 108 pair<_InIter, _OutIter> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 109 __copy(_InIter __first, _Sent __last, _OutIter __result) { 110 return std::__dispatch_copy_or_move<_AlgPolicy, __copy_loop<_AlgPolicy>, __copy_trivial>( 111 std::move(__first), std::move(__last), std::move(__result)); 112 } 113 114 template <class _InputIterator, class _OutputIterator> 115 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator 116 copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result) { 117 return std::__copy<_ClassicAlgPolicy>(__first, __last, __result).second; 118 } 119 120 _LIBCPP_END_NAMESPACE_STD 121 122 _LIBCPP_POP_MACROS 123 124 #endif // _LIBCPP___ALGORITHM_COPY_H 125