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 namespace __stable_partition { 46 47 struct __fn { 48 template <class _Iter, class _Sent, class _Proj, class _Pred> 49 _LIBCPP_HIDE_FROM_ABI static subrange<__remove_cvref_t<_Iter>> 50 __stable_partition_fn_impl(_Iter&& __first, _Sent&& __last, _Pred&& __pred, _Proj&& __proj) { 51 auto __last_iter = ranges::next(__first, __last); 52 53 auto&& __projected_pred = std::__make_projected(__pred, __proj); 54 auto __result = std::__stable_partition<_RangeAlgPolicy>( 55 std::move(__first), __last_iter, __projected_pred, __iterator_concept<_Iter>()); 56 57 return {std::move(__result), std::move(__last_iter)}; 58 } 59 60 template <bidirectional_iterator _Iter, 61 sentinel_for<_Iter> _Sent, 62 class _Proj = identity, 63 indirect_unary_predicate<projected<_Iter, _Proj>> _Pred> 64 requires permutable<_Iter> 65 _LIBCPP_HIDE_FROM_ABI subrange<_Iter> operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const { 66 return __stable_partition_fn_impl(__first, __last, __pred, __proj); 67 } 68 69 template <bidirectional_range _Range, 70 class _Proj = identity, 71 indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred> 72 requires permutable<iterator_t<_Range>> 73 _LIBCPP_HIDE_FROM_ABI borrowed_subrange_t<_Range> 74 operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const { 75 return __stable_partition_fn_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj); 76 } 77 }; 78 79 } // namespace __stable_partition 80 81 inline namespace __cpo { 82 inline constexpr auto stable_partition = __stable_partition::__fn{}; 83 } // namespace __cpo 84 } // namespace ranges 85 86 _LIBCPP_END_NAMESPACE_STD 87 88 #endif // _LIBCPP_STD_VER >= 20 89 90 _LIBCPP_POP_MACROS 91 92 #endif // _LIBCPP___ALGORITHM_RANGES_STABLE_PARTITION_H 93