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_PARTITION_H 10 #define _LIBCPP___ALGORITHM_RANGES_PARTITION_H 11 12 #include <__algorithm/iterator_operations.h> 13 #include <__algorithm/make_projected.h> 14 #include <__algorithm/partition.h> 15 #include <__algorithm/ranges_iterator_concept.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/permutable.h> 23 #include <__iterator/projected.h> 24 #include <__ranges/access.h> 25 #include <__ranges/concepts.h> 26 #include <__ranges/subrange.h> 27 #include <__type_traits/remove_cvref.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 _LIBCPP_PUSH_MACROS 37 #include <__undef_macros> 38 39 #if _LIBCPP_STD_VER >= 20 40 41 _LIBCPP_BEGIN_NAMESPACE_STD 42 43 namespace ranges { 44 struct __partition { 45 template <class _Iter, class _Sent, class _Proj, class _Pred> 46 _LIBCPP_HIDE_FROM_ABI static constexpr subrange<__remove_cvref_t<_Iter>> 47 __partition_fn_impl(_Iter&& __first, _Sent&& __last, _Pred&& __pred, _Proj&& __proj) { 48 auto&& __projected_pred = std::__make_projected(__pred, __proj); 49 auto __result = std::__partition<_RangeAlgPolicy>( 50 std::move(__first), std::move(__last), __projected_pred, __iterator_concept<_Iter>()); 51 52 return {std::move(__result.first), std::move(__result.second)}; 53 } 54 55 template <permutable _Iter, 56 sentinel_for<_Iter> _Sent, 57 class _Proj = identity, 58 indirect_unary_predicate<projected<_Iter, _Proj>> _Pred> 59 _LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter> 60 operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const { 61 return __partition_fn_impl(__first, __last, __pred, __proj); 62 } 63 64 template <forward_range _Range, 65 class _Proj = identity, 66 indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred> 67 requires permutable<iterator_t<_Range>> 68 _LIBCPP_HIDE_FROM_ABI constexpr borrowed_subrange_t<_Range> 69 operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const { 70 return __partition_fn_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj); 71 } 72 }; 73 74 inline namespace __cpo { 75 inline constexpr auto partition = __partition{}; 76 } // namespace __cpo 77 } // namespace ranges 78 79 _LIBCPP_END_NAMESPACE_STD 80 81 #endif // _LIBCPP_STD_VER >= 20 82 83 _LIBCPP_POP_MACROS 84 85 #endif // _LIBCPP___ALGORITHM_RANGES_PARTITION_H 86