libcxx/include/__algorithm/ranges_stable_partition.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_STABLE_PARTITION_H
  10 #define _LIBCPP___ALGORITHM_RANGES_STABLE_PARTITION_H
  11
  12 #include <__algorithm/iterator_operations.h>
  13 #include <__algorithm/make_projected.h>
  14 #include <__algorithm/ranges_iterator_concept.h>
  15 #include <__algorithm/stable_partition.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/permutable.h>
  24 #include <__iterator/projected.h>
  25 #include <__ranges/access.h>
  26 #include <__ranges/concepts.h>
  27 #include <__ranges/dangling.h>
  28 #include <__ranges/subrange.h>
  29 #include <__type_traits/remove_cvref.h>
  30 #include <__utility/forward.h>
  31 #include <__utility/move.h>
  32
  33 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  34 #  pragma GCC system_header
  35 #endif
  36
  37 #if _LIBCPP_STD_VER >= 20
  38
  39 _LIBCPP_BEGIN_NAMESPACE_STD
  40
  41 namespace ranges {
  42 namespace __stable_partition {
  43
  44 struct __fn {
  45   template <class _Iter, class _Sent, class _Proj, class _Pred>
  46   _LIBCPP_HIDE_FROM_ABI static subrange<__remove_cvref_t<_Iter>>
  47   __stable_partition_fn_impl(_Iter&& __first, _Sent&& __last, _Pred&& __pred, _Proj&& __proj) {
  48     auto __last_iter = ranges::next(__first, __last);
  49
  50     auto&& __projected_pred = std::__make_projected(__pred, __proj);
  51     auto __result           = std::__stable_partition<_RangeAlgPolicy>(
  52         std::move(__first), __last_iter, __projected_pred, __iterator_concept<_Iter>());
  53
  54     return {std::move(__result), std::move(__last_iter)};
  55   }
  56
  57   template <bidirectional_iterator _Iter,
  58             sentinel_for<_Iter> _Sent,
  59             class _Proj = identity,
  60             indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
  61     requires permutable<_Iter>
  62   _LIBCPP_HIDE_FROM_ABI subrange<_Iter> operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const {
  63     return __stable_partition_fn_impl(__first, __last, __pred, __proj);
  64   }
  65
  66   template <bidirectional_range _Range,
  67             class _Proj = identity,
  68             indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
  69     requires permutable<iterator_t<_Range>>
  70   _LIBCPP_HIDE_FROM_ABI borrowed_subrange_t<_Range>
  71   operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const {
  72     return __stable_partition_fn_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj);
  73   }
  74 };
  75
  76 } // namespace __stable_partition
  77
  78 inline namespace __cpo {
  79 inline constexpr auto stable_partition = __stable_partition::__fn{};
  80 } // namespace __cpo
  81 } // namespace ranges
  82
  83 _LIBCPP_END_NAMESPACE_STD
  84
  85 #endif // _LIBCPP_STD_VER >= 20
  86
  87 #endif // _LIBCPP___ALGORITHM_RANGES_STABLE_PARTITION_H