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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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef _LIBCPP___ALGORITHM_UNIQUE_COPY_H10#define _LIBCPP___ALGORITHM_UNIQUE_COPY_H11 12#include <__algorithm/comp.h>13#include <__algorithm/iterator_operations.h>14#include <__config>15#include <__iterator/iterator_traits.h>16#include <__type_traits/conditional.h>17#include <__type_traits/is_base_of.h>18#include <__type_traits/is_same.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_header24#endif25 26_LIBCPP_PUSH_MACROS27#include <__undef_macros>28 29_LIBCPP_BEGIN_NAMESPACE_STD30 31namespace __unique_copy_tags {32 33struct __reread_from_input_tag {};34struct __reread_from_output_tag {};35struct __read_from_tmp_value_tag {};36 37} // namespace __unique_copy_tags38 39template <class _AlgPolicy, class _BinaryPredicate, class _InputIterator, class _Sent, class _OutputIterator>40_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI pair<_InputIterator, _OutputIterator>41__unique_copy(_InputIterator __first,42 _Sent __last,43 _OutputIterator __result,44 _BinaryPredicate&& __pred,45 __unique_copy_tags::__read_from_tmp_value_tag) {46 if (__first != __last) {47 typename _IterOps<_AlgPolicy>::template __value_type<_InputIterator> __t(*__first);48 *__result = __t;49 ++__result;50 while (++__first != __last) {51 if (!__pred(__t, *__first)) {52 __t = *__first;53 *__result = __t;54 ++__result;55 }56 }57 }58 return pair<_InputIterator, _OutputIterator>(std::move(__first), std::move(__result));59}60 61template <class _AlgPolicy, class _BinaryPredicate, class _ForwardIterator, class _Sent, class _OutputIterator>62_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI pair<_ForwardIterator, _OutputIterator>63__unique_copy(_ForwardIterator __first,64 _Sent __last,65 _OutputIterator __result,66 _BinaryPredicate&& __pred,67 __unique_copy_tags::__reread_from_input_tag) {68 if (__first != __last) {69 _ForwardIterator __i = __first;70 *__result = *__i;71 ++__result;72 while (++__first != __last) {73 if (!__pred(*__i, *__first)) {74 *__result = *__first;75 ++__result;76 __i = __first;77 }78 }79 }80 return pair<_ForwardIterator, _OutputIterator>(std::move(__first), std::move(__result));81}82 83template <class _AlgPolicy, class _BinaryPredicate, class _InputIterator, class _Sent, class _InputAndOutputIterator>84_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI pair<_InputIterator, _InputAndOutputIterator>85__unique_copy(_InputIterator __first,86 _Sent __last,87 _InputAndOutputIterator __result,88 _BinaryPredicate&& __pred,89 __unique_copy_tags::__reread_from_output_tag) {90 if (__first != __last) {91 *__result = *__first;92 while (++__first != __last)93 if (!__pred(*__result, *__first))94 *++__result = *__first;95 ++__result;96 }97 return pair<_InputIterator, _InputAndOutputIterator>(std::move(__first), std::move(__result));98}99 100template <class _InputIterator, class _OutputIterator, class _BinaryPredicate>101inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator102unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryPredicate __pred) {103 using __algo_tag = __conditional_t<104 is_base_of<forward_iterator_tag, typename iterator_traits<_InputIterator>::iterator_category>::value,105 __unique_copy_tags::__reread_from_input_tag,106 __conditional_t<107 is_base_of<forward_iterator_tag, typename iterator_traits<_OutputIterator>::iterator_category>::value &&108 is_same< typename iterator_traits<_InputIterator>::value_type,109 typename iterator_traits<_OutputIterator>::value_type>::value,110 __unique_copy_tags::__reread_from_output_tag,111 __unique_copy_tags::__read_from_tmp_value_tag> >;112 return std::__unique_copy<_ClassicAlgPolicy>(113 std::move(__first), std::move(__last), std::move(__result), __pred, __algo_tag())114 .second;115}116 117template <class _InputIterator, class _OutputIterator>118inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator119unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result) {120 return std::unique_copy(std::move(__first), std::move(__last), std::move(__result), __equal_to());121}122 123_LIBCPP_END_NAMESPACE_STD124 125_LIBCPP_POP_MACROS126 127#endif // _LIBCPP___ALGORITHM_UNIQUE_COPY_H128