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/iterator_traits.h> 18 #include <__iterator/segmented_iterator.h> 19 #include <__type_traits/common_type.h> 20 #include <__type_traits/enable_if.h> 21 #include <__utility/move.h> 22 #include <__utility/pair.h> 23 24 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 25 # pragma GCC system_header 26 #endif 27 28 _LIBCPP_PUSH_MACROS 29 #include <__undef_macros> 30 31 _LIBCPP_BEGIN_NAMESPACE_STD 32 33 template <class, class _InIter, class _Sent, class _OutIter> 34 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter> __copy(_InIter, _Sent, _OutIter); 35 36 template <class _AlgPolicy> 37 struct __copy_impl { 38 template <class _InIter, class _Sent, class _OutIter> 39 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter> 40 operator()(_InIter __first, _Sent __last, _OutIter __result) const { 41 while (__first != __last) { 42 *__result = *__first; 43 ++__first; 44 ++__result; 45 } 46 47 return std::make_pair(std::move(__first), std::move(__result)); 48 } 49 50 template <class _InIter, class _OutIter> 51 struct _CopySegment { 52 using _Traits = __segmented_iterator_traits<_InIter>; 53 54 _OutIter& __result_; 55 56 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit _CopySegment(_OutIter& __result) 57 : __result_(__result) {} 58 59 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 60 operator()(typename _Traits::__local_iterator __lfirst, typename _Traits::__local_iterator __llast) { 61 __result_ = std::__copy<_AlgPolicy>(__lfirst, __llast, std::move(__result_)).second; 62 } 63 }; 64 65 template <class _InIter, class _OutIter, __enable_if_t<__is_segmented_iterator<_InIter>::value, int> = 0> 66 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter> 67 operator()(_InIter __first, _InIter __last, _OutIter __result) const { 68 std::__for_each_segment(__first, __last, _CopySegment<_InIter, _OutIter>(__result)); 69 return std::make_pair(__last, std::move(__result)); 70 } 71 72 template <class _InIter, 73 class _OutIter, 74 __enable_if_t<__has_random_access_iterator_category<_InIter>::value && 75 !__is_segmented_iterator<_InIter>::value && __is_segmented_iterator<_OutIter>::value, 76 int> = 0> 77 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter> 78 operator()(_InIter __first, _InIter __last, _OutIter __result) const { 79 using _Traits = __segmented_iterator_traits<_OutIter>; 80 using _DiffT = typename common_type<__iter_diff_t<_InIter>, __iter_diff_t<_OutIter> >::type; 81 82 if (__first == __last) 83 return std::make_pair(std::move(__first), std::move(__result)); 84 85 auto __local_first = _Traits::__local(__result); 86 auto __segment_iterator = _Traits::__segment(__result); 87 while (true) { 88 auto __local_last = _Traits::__end(__segment_iterator); 89 auto __size = std::min<_DiffT>(__local_last - __local_first, __last - __first); 90 auto __iters = std::__copy<_AlgPolicy>(__first, __first + __size, __local_first); 91 __first = std::move(__iters.first); 92 93 if (__first == __last) 94 return std::make_pair(std::move(__first), _Traits::__compose(__segment_iterator, std::move(__iters.second))); 95 96 __local_first = _Traits::__begin(++__segment_iterator); 97 } 98 } 99 100 // At this point, the iterators have been unwrapped so any `contiguous_iterator` has been unwrapped to a pointer. 101 template <class _In, class _Out, __enable_if_t<__can_lower_copy_assignment_to_memmove<_In, _Out>::value, int> = 0> 102 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_In*, _Out*> 103 operator()(_In* __first, _In* __last, _Out* __result) const { 104 return std::__copy_trivial_impl(__first, __last, __result); 105 } 106 }; 107 108 template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter> 109 pair<_InIter, _OutIter> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 110 __copy(_InIter __first, _Sent __last, _OutIter __result) { 111 return std::__copy_move_unwrap_iters<__copy_impl<_AlgPolicy> >( 112 std::move(__first), std::move(__last), std::move(__result)); 113 } 114 115 template <class _InputIterator, class _OutputIterator> 116 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator 117 copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result) { 118 return std::__copy<_ClassicAlgPolicy>(__first, __last, __result).second; 119 } 120 121 _LIBCPP_END_NAMESPACE_STD 122 123 _LIBCPP_POP_MACROS 124 125 #endif // _LIBCPP___ALGORITHM_COPY_H 126