libcxx/include/__algorithm/ranges_partial_sort.h

   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 #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 __partial_sort {
  45   template <class _Iter, class _Sent, class _Comp, class _Proj>
  46   _LIBCPP_HIDE_FROM_ABI constexpr static _Iter
  47   __partial_sort_fn_impl(_Iter __first, _Iter __middle, _Sent __last, _Comp& __comp, _Proj& __proj) {
  48     auto&& __projected_comp = std::__make_projected(__comp, __proj);
  49     return std::__partial_sort<_RangeAlgPolicy>(std::move(__first), std::move(__middle), __last, __projected_comp);
  50   }
  51
  52   template <random_access_iterator _Iter, sentinel_for<_Iter> _Sent, class _Comp = ranges::less, class _Proj = identity>
  53     requires sortable<_Iter, _Comp, _Proj>
  54   _LIBCPP_HIDE_FROM_ABI constexpr _Iter
  55   operator()(_Iter __first, _Iter __middle, _Sent __last, _Comp __comp = {}, _Proj __proj = {}) const {
  56     return __partial_sort_fn_impl(std::move(__first), std::move(__middle), std::move(__last), __comp, __proj);
  57   }
  58
  59   template <random_access_range _Range, class _Comp = ranges::less, class _Proj = identity>
  60     requires sortable<iterator_t<_Range>, _Comp, _Proj>
  61   _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range>
  62   operator()(_Range&& __r, iterator_t<_Range> __middle, _Comp __comp = {}, _Proj __proj = {}) const {
  63     return __partial_sort_fn_impl(ranges::begin(__r), std::move(__middle), ranges::end(__r), __comp, __proj);
  64   }
  65 };
  66
  67 inline namespace __cpo {
  68 inline constexpr auto partial_sort = __partial_sort{};
  69 } // namespace __cpo
  70 } // namespace ranges
  71
  72 _LIBCPP_END_NAMESPACE_STD
  73
  74 #endif // _LIBCPP_STD_VER >= 20
  75
  76 _LIBCPP_POP_MACROS
  77
  78 #endif // _LIBCPP___ALGORITHM_RANGES_PARTIAL_SORT_H