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 <__utility/forward.h> 28 #include <__utility/move.h> 29 #include <__utility/pair.h> 30 31 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 32 # pragma GCC system_header 33 #endif 34 35 _LIBCPP_PUSH_MACROS 36 #include <__undef_macros> 37 38 #if _LIBCPP_STD_VER >= 20 39 40 _LIBCPP_BEGIN_NAMESPACE_STD 41 42 namespace ranges { 43 namespace __partition { 44 45 struct __fn { 46 template <class _Iter, class _Sent, class _Proj, class _Pred> 47 _LIBCPP_HIDE_FROM_ABI static constexpr subrange<__remove_cvref_t<_Iter>> 48 __partition_fn_impl(_Iter&& __first, _Sent&& __last, _Pred&& __pred, _Proj&& __proj) { 49 auto&& __projected_pred = std::__make_projected(__pred, __proj); 50 auto __result = std::__partition<_RangeAlgPolicy>( 51 std::move(__first), std::move(__last), __projected_pred, __iterator_concept<_Iter>()); 52 53 return {std::move(__result.first), std::move(__result.second)}; 54 } 55 56 template <permutable _Iter, 57 sentinel_for<_Iter> _Sent, 58 class _Proj = identity, 59 indirect_unary_predicate<projected<_Iter, _Proj>> _Pred> 60 _LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter> 61 operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const { 62 return __partition_fn_impl(__first, __last, __pred, __proj); 63 } 64 65 template <forward_range _Range, 66 class _Proj = identity, 67 indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred> 68 requires permutable<iterator_t<_Range>> 69 _LIBCPP_HIDE_FROM_ABI constexpr borrowed_subrange_t<_Range> 70 operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const { 71 return __partition_fn_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj); 72 } 73 }; 74 75 } // namespace __partition 76 77 inline namespace __cpo { 78 inline constexpr auto partition = __partition::__fn{}; 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_PARTITION_H 89