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 _LIBCPP_PUSH_MACROS 38 #include <__undef_macros> 39 40 #if _LIBCPP_STD_VER >= 20 41 42 _LIBCPP_BEGIN_NAMESPACE_STD 43 44 namespace ranges { 45 struct __stable_partition { 46 template <class _Iter, class _Sent, class _Proj, class _Pred> 47 _LIBCPP_HIDE_FROM_ABI static subrange<__remove_cvref_t<_Iter>> 48 __stable_partition_fn_impl(_Iter&& __first, _Sent&& __last, _Pred&& __pred, _Proj&& __proj) { 49 auto __last_iter = ranges::next(__first, __last); 50 51 auto&& __projected_pred = std::__make_projected(__pred, __proj); 52 auto __result = std::__stable_partition<_RangeAlgPolicy>( 53 std::move(__first), __last_iter, __projected_pred, __iterator_concept<_Iter>()); 54 55 return {std::move(__result), std::move(__last_iter)}; 56 } 57 58 template <bidirectional_iterator _Iter, 59 sentinel_for<_Iter> _Sent, 60 class _Proj = identity, 61 indirect_unary_predicate<projected<_Iter, _Proj>> _Pred> 62 requires permutable<_Iter> 63 _LIBCPP_HIDE_FROM_ABI subrange<_Iter> operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const { 64 return __stable_partition_fn_impl(__first, __last, __pred, __proj); 65 } 66 67 template <bidirectional_range _Range, 68 class _Proj = identity, 69 indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred> 70 requires permutable<iterator_t<_Range>> 71 _LIBCPP_HIDE_FROM_ABI borrowed_subrange_t<_Range> 72 operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const { 73 return __stable_partition_fn_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj); 74 } 75 }; 76 77 inline namespace __cpo { 78 inline constexpr auto stable_partition = __stable_partition{}; 79 } // namespace __cpo 80 } // namespace ranges 81 82 _LIBCPP_END_NAMESPACE_STD 83 84 #endif // _LIBCPP_STD_VER >= 20 85 86 _LIBCPP_POP_MACROS 87 88 #endif // _LIBCPP___ALGORITHM_RANGES_STABLE_PARTITION_H 89