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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_RANGES_UNIQUE_COPY_H10#define _LIBCPP___ALGORITHM_RANGES_UNIQUE_COPY_H11 12#include <__algorithm/in_out_result.h>13#include <__algorithm/iterator_operations.h>14#include <__algorithm/make_projected.h>15#include <__algorithm/unique_copy.h>16#include <__concepts/same_as.h>17#include <__config>18#include <__functional/identity.h>19#include <__functional/invoke.h>20#include <__functional/ranges_operations.h>21#include <__iterator/concepts.h>22#include <__iterator/iterator_traits.h>23#include <__iterator/projected.h>24#include <__ranges/access.h>25#include <__ranges/concepts.h>26#include <__ranges/dangling.h>27#include <__utility/forward.h>28#include <__utility/move.h>29#include <__utility/pair.h>30 31#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)32# pragma GCC system_header33#endif34 35_LIBCPP_PUSH_MACROS36#include <__undef_macros>37 38#if _LIBCPP_STD_VER >= 2039 40_LIBCPP_BEGIN_NAMESPACE_STD41 42namespace ranges {43 44template <class _InIter, class _OutIter>45using unique_copy_result = in_out_result<_InIter, _OutIter>;46 47template <class _InIter, class _OutIter>48concept __can_reread_from_output = (input_iterator<_OutIter> && same_as<iter_value_t<_InIter>, iter_value_t<_OutIter>>);49 50struct __unique_copy {51 template <class _InIter, class _OutIter>52 static consteval auto __get_algo_tag() {53 if constexpr (forward_iterator<_InIter>) {54 return __unique_copy_tags::__reread_from_input_tag{};55 } else if constexpr (__can_reread_from_output<_InIter, _OutIter>) {56 return __unique_copy_tags::__reread_from_output_tag{};57 } else if constexpr (indirectly_copyable_storable<_InIter, _OutIter>) {58 return __unique_copy_tags::__read_from_tmp_value_tag{};59 }60 }61 62 template <class _InIter, class _OutIter>63 using __algo_tag_t _LIBCPP_NODEBUG = decltype(__get_algo_tag<_InIter, _OutIter>());64 65 template <input_iterator _InIter,66 sentinel_for<_InIter> _Sent,67 weakly_incrementable _OutIter,68 class _Proj = identity,69 indirect_equivalence_relation<projected<_InIter, _Proj>> _Comp = ranges::equal_to>70 requires indirectly_copyable<_InIter, _OutIter> &&71 (forward_iterator<_InIter> ||72 (input_iterator<_OutIter> && same_as<iter_value_t<_InIter>, iter_value_t<_OutIter>>) ||73 indirectly_copyable_storable<_InIter, _OutIter>)74 _LIBCPP_HIDE_FROM_ABI constexpr unique_copy_result<_InIter, _OutIter>75 operator()(_InIter __first, _Sent __last, _OutIter __result, _Comp __comp = {}, _Proj __proj = {}) const {76 auto __ret = std::__unique_copy<_RangeAlgPolicy>(77 std::move(__first),78 std::move(__last),79 std::move(__result),80 std::__make_projected(__comp, __proj),81 __algo_tag_t<_InIter, _OutIter>());82 return {std::move(__ret.first), std::move(__ret.second)};83 }84 85 template <input_range _Range,86 weakly_incrementable _OutIter,87 class _Proj = identity,88 indirect_equivalence_relation<projected<iterator_t<_Range>, _Proj>> _Comp = ranges::equal_to>89 requires indirectly_copyable<iterator_t<_Range>, _OutIter> &&90 (forward_iterator<iterator_t<_Range>> ||91 (input_iterator<_OutIter> && same_as<range_value_t<_Range>, iter_value_t<_OutIter>>) ||92 indirectly_copyable_storable<iterator_t<_Range>, _OutIter>)93 _LIBCPP_HIDE_FROM_ABI constexpr unique_copy_result<borrowed_iterator_t<_Range>, _OutIter>94 operator()(_Range&& __range, _OutIter __result, _Comp __comp = {}, _Proj __proj = {}) const {95 auto __ret = std::__unique_copy<_RangeAlgPolicy>(96 ranges::begin(__range),97 ranges::end(__range),98 std::move(__result),99 std::__make_projected(__comp, __proj),100 __algo_tag_t<iterator_t<_Range>, _OutIter>());101 return {std::move(__ret.first), std::move(__ret.second)};102 }103};104 105inline namespace __cpo {106inline constexpr auto unique_copy = __unique_copy{};107} // namespace __cpo108} // namespace ranges109 110_LIBCPP_END_NAMESPACE_STD111 112#endif // _LIBCPP_STD_VER >= 20113 114_LIBCPP_POP_MACROS115 116#endif // _LIBCPP___ALGORITHM_RANGES_UNIQUE_COPY_H117