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_PARTIAL_SORT_H 10 #define _LIBCPP___ALGORITHM_RANGES_PARTIAL_SORT_H 11 12 #include <__algorithm/iterator_operations.h> 13 #include <__algorithm/make_projected.h> 14 #include <__algorithm/partial_sort.h> 15 #include <__concepts/same_as.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/projected.h> 24 #include <__iterator/sortable.h> 25 #include <__ranges/access.h> 26 #include <__ranges/concepts.h> 27 #include <__ranges/dangling.h> 28 #include <__utility/forward.h> 29 #include <__utility/move.h> 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 __partial_sort { 41 42 struct __fn { 43 template <class _Iter, class _Sent, class _Comp, class _Proj> 44 _LIBCPP_HIDE_FROM_ABI constexpr static 45 _Iter __partial_sort_fn_impl(_Iter __first, _Iter __middle, _Sent __last, _Comp& __comp, _Proj& __proj) { 46 auto&& __projected_comp = std::__make_projected(__comp, __proj); 47 return std::__partial_sort<_RangeAlgPolicy>(std::move(__first), std::move(__middle), __last, __projected_comp); 48 } 49 50 template <random_access_iterator _Iter, sentinel_for<_Iter> _Sent, class _Comp = ranges::less, class _Proj = identity> 51 requires sortable<_Iter, _Comp, _Proj> 52 _LIBCPP_HIDE_FROM_ABI constexpr 53 _Iter operator()(_Iter __first, _Iter __middle, _Sent __last, _Comp __comp = {}, _Proj __proj = {}) const { 54 return __partial_sort_fn_impl(std::move(__first), std::move(__middle), std::move(__last), __comp, __proj); 55 } 56 57 template <random_access_range _Range, class _Comp = ranges::less, class _Proj = identity> 58 requires sortable<iterator_t<_Range>, _Comp, _Proj> 59 _LIBCPP_HIDE_FROM_ABI constexpr 60 borrowed_iterator_t<_Range> operator()(_Range&& __r, iterator_t<_Range> __middle, _Comp __comp = {}, 61 _Proj __proj = {}) const { 62 return __partial_sort_fn_impl(ranges::begin(__r), std::move(__middle), ranges::end(__r), __comp, __proj); 63 } 64 }; 65 66 } // namespace __partial_sort 67 68 inline namespace __cpo { 69 inline constexpr auto partial_sort = __partial_sort::__fn{}; 70 } // namespace __cpo 71 } // namespace ranges 72 73 _LIBCPP_END_NAMESPACE_STD 74 75 #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES) 76 77 #endif // _LIBCPP___ALGORITHM_RANGES_PARTIAL_SORT_H 78