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_RANGES_UNIQUE_COPY_H 10 #define _LIBCPP___ALGORITHM_RANGES_UNIQUE_COPY_H 11 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_header 33 #endif 34 35 #if _LIBCPP_STD_VER >= 20 36 37 _LIBCPP_BEGIN_NAMESPACE_STD 38 39 namespace ranges { 40 41 template <class _InIter, class _OutIter> 42 using unique_copy_result = in_out_result<_InIter, _OutIter>; 43 44 namespace __unique_copy { 45 46 template <class _InIter, class _OutIter> 47 concept __can_reread_from_output = (input_iterator<_OutIter> && same_as<iter_value_t<_InIter>, iter_value_t<_OutIter>>); 48 49 struct __fn { 50 template <class _InIter, class _OutIter> 51 static consteval auto __get_algo_tag() { 52 if constexpr (forward_iterator<_InIter>) { 53 return __unique_copy_tags::__reread_from_input_tag{}; 54 } else if constexpr (__can_reread_from_output<_InIter, _OutIter>) { 55 return __unique_copy_tags::__reread_from_output_tag{}; 56 } else if constexpr (indirectly_copyable_storable<_InIter, _OutIter>) { 57 return __unique_copy_tags::__read_from_tmp_value_tag{}; 58 } 59 } 60 61 template <class _InIter, class _OutIter> 62 using __algo_tag_t = decltype(__get_algo_tag<_InIter, _OutIter>()); 63 64 template <input_iterator _InIter, 65 sentinel_for<_InIter> _Sent, 66 weakly_incrementable _OutIter, 67 class _Proj = identity, 68 indirect_equivalence_relation<projected<_InIter, _Proj>> _Comp = ranges::equal_to> 69 requires indirectly_copyable<_InIter, _OutIter> && 70 (forward_iterator<_InIter> || 71 (input_iterator<_OutIter> && same_as<iter_value_t<_InIter>, iter_value_t<_OutIter>>) || 72 indirectly_copyable_storable<_InIter, _OutIter>) 73 _LIBCPP_HIDE_FROM_ABI constexpr unique_copy_result<_InIter, _OutIter> 74 operator()(_InIter __first, _Sent __last, _OutIter __result, _Comp __comp = {}, _Proj __proj = {}) const { 75 auto __ret = std::__unique_copy<_RangeAlgPolicy>( 76 std::move(__first), 77 std::move(__last), 78 std::move(__result), 79 std::__make_projected(__comp, __proj), 80 __algo_tag_t<_InIter, _OutIter>()); 81 return {std::move(__ret.first), std::move(__ret.second)}; 82 } 83 84 template <input_range _Range, 85 weakly_incrementable _OutIter, 86 class _Proj = identity, 87 indirect_equivalence_relation<projected<iterator_t<_Range>, _Proj>> _Comp = ranges::equal_to> 88 requires indirectly_copyable<iterator_t<_Range>, _OutIter> && 89 (forward_iterator<iterator_t<_Range>> || 90 (input_iterator<_OutIter> && same_as<range_value_t<_Range>, iter_value_t<_OutIter>>) || 91 indirectly_copyable_storable<iterator_t<_Range>, _OutIter>) 92 _LIBCPP_HIDE_FROM_ABI constexpr unique_copy_result<borrowed_iterator_t<_Range>, _OutIter> 93 operator()(_Range&& __range, _OutIter __result, _Comp __comp = {}, _Proj __proj = {}) const { 94 auto __ret = std::__unique_copy<_RangeAlgPolicy>( 95 ranges::begin(__range), 96 ranges::end(__range), 97 std::move(__result), 98 std::__make_projected(__comp, __proj), 99 __algo_tag_t<iterator_t<_Range>, _OutIter>()); 100 return {std::move(__ret.first), std::move(__ret.second)}; 101 } 102 }; 103 104 } // namespace __unique_copy 105 106 inline namespace __cpo { 107 inline constexpr auto unique_copy = __unique_copy::__fn{}; 108 } // namespace __cpo 109 } // namespace ranges 110 111 _LIBCPP_END_NAMESPACE_STD 112 113 #endif // _LIBCPP_STD_VER >= 20 114 115 #endif // _LIBCPP___ALGORITHM_RANGES_UNIQUE_COPY_H 116