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 <type_traits> 30 31 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 32 # pragma GCC system_header 33 #endif 34 35 #if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES) 36 37 _LIBCPP_BEGIN_NAMESPACE_STD 38 39 namespace ranges { 40 namespace __partition { 41 42 struct __fn { 43 44 template <class _Iter, class _Sent, class _Proj, class _Pred> 45 _LIBCPP_HIDE_FROM_ABI static constexpr 46 subrange<__uncvref_t<_Iter>> __partition_fn_impl(_Iter&& __first, _Sent&& __last, _Pred&& __pred, _Proj&& __proj) { 47 auto&& __projected_pred = std::__make_projected(__pred, __proj); 48 auto __result = std::__partition<_RangeAlgPolicy>( 49 std::move(__first), std::move(__last), __projected_pred, __iterator_concept<_Iter>()); 50 51 return {std::move(__result.first), std::move(__result.second)}; 52 } 53 54 template <permutable _Iter, sentinel_for<_Iter> _Sent, class _Proj = identity, 55 indirect_unary_predicate<projected<_Iter, _Proj>> _Pred> 56 _LIBCPP_HIDE_FROM_ABI constexpr 57 subrange<_Iter> operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const { 58 return __partition_fn_impl(__first, __last, __pred, __proj); 59 } 60 61 template <forward_range _Range, class _Proj = identity, 62 indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred> 63 requires permutable<iterator_t<_Range>> 64 _LIBCPP_HIDE_FROM_ABI constexpr 65 borrowed_subrange_t<_Range> operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const { 66 return __partition_fn_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj); 67 } 68 69 }; 70 71 } // namespace __partition 72 73 inline namespace __cpo { 74 inline constexpr auto partition = __partition::__fn{}; 75 } // namespace __cpo 76 } // namespace ranges 77 78 _LIBCPP_END_NAMESPACE_STD 79 80 #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES) 81 82 #endif // _LIBCPP___ALGORITHM_RANGES_PARTITION_H 83