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_STABLE_PARTITION_H 10 #define _LIBCPP___ALGORITHM_RANGES_STABLE_PARTITION_H 11 12 #include <__algorithm/iterator_operations.h> 13 #include <__algorithm/make_projected.h> 14 #include <__algorithm/ranges_iterator_concept.h> 15 #include <__algorithm/stable_partition.h> 16 #include <__config> 17 #include <__functional/identity.h> 18 #include <__functional/invoke.h> 19 #include <__functional/ranges_operations.h> 20 #include <__iterator/concepts.h> 21 #include <__iterator/iterator_traits.h> 22 #include <__iterator/next.h> 23 #include <__iterator/permutable.h> 24 #include <__iterator/projected.h> 25 #include <__ranges/access.h> 26 #include <__ranges/concepts.h> 27 #include <__ranges/dangling.h> 28 #include <__ranges/subrange.h> 29 #include <__type_traits/remove_cvref.h> 30 #include <__utility/forward.h> 31 #include <__utility/move.h> 32 33 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 34 # pragma GCC system_header 35 #endif 36 37 #if _LIBCPP_STD_VER >= 20 38 39 _LIBCPP_BEGIN_NAMESPACE_STD 40 41 namespace ranges { 42 namespace __stable_partition { 43 44 struct __fn { 45 template <class _Iter, class _Sent, class _Proj, class _Pred> 46 _LIBCPP_HIDE_FROM_ABI static subrange<__remove_cvref_t<_Iter>> 47 __stable_partition_fn_impl(_Iter&& __first, _Sent&& __last, _Pred&& __pred, _Proj&& __proj) { 48 auto __last_iter = ranges::next(__first, __last); 49 50 auto&& __projected_pred = std::__make_projected(__pred, __proj); 51 auto __result = std::__stable_partition<_RangeAlgPolicy>( 52 std::move(__first), __last_iter, __projected_pred, __iterator_concept<_Iter>()); 53 54 return {std::move(__result), std::move(__last_iter)}; 55 } 56 57 template <bidirectional_iterator _Iter, 58 sentinel_for<_Iter> _Sent, 59 class _Proj = identity, 60 indirect_unary_predicate<projected<_Iter, _Proj>> _Pred> 61 requires permutable<_Iter> 62 _LIBCPP_HIDE_FROM_ABI subrange<_Iter> operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const { 63 return __stable_partition_fn_impl(__first, __last, __pred, __proj); 64 } 65 66 template <bidirectional_range _Range, 67 class _Proj = identity, 68 indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred> 69 requires permutable<iterator_t<_Range>> 70 _LIBCPP_HIDE_FROM_ABI borrowed_subrange_t<_Range> 71 operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const { 72 return __stable_partition_fn_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj); 73 } 74 }; 75 76 } // namespace __stable_partition 77 78 inline namespace __cpo { 79 inline constexpr auto stable_partition = __stable_partition::__fn{}; 80 } // namespace __cpo 81 } // namespace ranges 82 83 _LIBCPP_END_NAMESPACE_STD 84 85 #endif // _LIBCPP_STD_VER >= 20 86 87 #endif // _LIBCPP___ALGORITHM_RANGES_STABLE_PARTITION_H 88