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 <__iterator/readable_traits.h> 25 #include <__ranges/access.h> 26 #include <__ranges/concepts.h> 27 #include <__ranges/dangling.h> 28 #include <__utility/forward.h> 29 #include <__utility/move.h> 30 #include <__utility/pair.h> 31 32 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 33 # pragma GCC system_header 34 #endif 35 36 #if _LIBCPP_STD_VER > 17 37 38 _LIBCPP_BEGIN_NAMESPACE_STD 39 40 namespace ranges { 41 42 template <class _InIter, class _OutIter> 43 using unique_copy_result = in_out_result<_InIter, _OutIter>; 44 45 namespace __unique_copy { 46 47 template <class _InIter, class _OutIter> 48 concept __can_reread_from_output = (input_iterator<_OutIter> && same_as<iter_value_t<_InIter>, iter_value_t<_OutIter>>); 49 50 struct __fn { 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 = 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 }; 104 105 } // namespace __unique_copy 106 107 inline namespace __cpo { 108 inline constexpr auto unique_copy = __unique_copy::__fn{}; 109 } // namespace __cpo 110 } // namespace ranges 111 112 _LIBCPP_END_NAMESPACE_STD 113 114 #endif // _LIBCPP_STD_VER > 17 115 116 #endif // _LIBCPP___ALGORITHM_RANGES_UNIQUE_COPY_H 117