libcxx/include/__algorithm/ranges_set_intersection.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_SET_INTERSECTION_H
  10 #define _LIBCPP___ALGORITHM_RANGES_SET_INTERSECTION_H
  11
  12 #include <__algorithm/in_in_out_result.h>
  13 #include <__algorithm/iterator_operations.h>
  14 #include <__algorithm/make_projected.h>
  15 #include <__algorithm/set_intersection.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/mergeable.h>
  22 #include <__ranges/access.h>
  23 #include <__ranges/concepts.h>
  24 #include <__ranges/dangling.h>
  25 #include <__utility/move.h>
  26
  27 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  28 #  pragma GCC system_header
  29 #endif
  30
  31 #if _LIBCPP_STD_VER >= 20
  32
  33 _LIBCPP_BEGIN_NAMESPACE_STD
  34
  35 namespace ranges {
  36
  37 template <class _InIter1, class _InIter2, class _OutIter>
  38 using set_intersection_result = in_in_out_result<_InIter1, _InIter2, _OutIter>;
  39
  40 namespace __set_intersection {
  41
  42 struct __fn {
  43   template <input_iterator _InIter1,
  44             sentinel_for<_InIter1> _Sent1,
  45             input_iterator _InIter2,
  46             sentinel_for<_InIter2> _Sent2,
  47             weakly_incrementable _OutIter,
  48             class _Comp  = less,
  49             class _Proj1 = identity,
  50             class _Proj2 = identity>
  51     requires mergeable<_InIter1, _InIter2, _OutIter, _Comp, _Proj1, _Proj2>
  52   _LIBCPP_HIDE_FROM_ABI constexpr set_intersection_result<_InIter1, _InIter2, _OutIter> operator()(
  53       _InIter1 __first1,
  54       _Sent1 __last1,
  55       _InIter2 __first2,
  56       _Sent2 __last2,
  57       _OutIter __result,
  58       _Comp __comp   = {},
  59       _Proj1 __proj1 = {},
  60       _Proj2 __proj2 = {}) const {
  61     auto __ret = std::__set_intersection<_RangeAlgPolicy>(
  62         std::move(__first1),
  63         std::move(__last1),
  64         std::move(__first2),
  65         std::move(__last2),
  66         std::move(__result),
  67         ranges::__make_projected_comp(__comp, __proj1, __proj2));
  68     return {std::move(__ret.__in1_), std::move(__ret.__in2_), std::move(__ret.__out_)};
  69   }
  70
  71   template <input_range _Range1,
  72             input_range _Range2,
  73             weakly_incrementable _OutIter,
  74             class _Comp  = less,
  75             class _Proj1 = identity,
  76             class _Proj2 = identity>
  77     requires mergeable<iterator_t<_Range1>, iterator_t<_Range2>, _OutIter, _Comp, _Proj1, _Proj2>
  78   _LIBCPP_HIDE_FROM_ABI constexpr set_intersection_result<borrowed_iterator_t<_Range1>,
  79                                                           borrowed_iterator_t<_Range2>,
  80                                                           _OutIter>
  81   operator()(_Range1&& __range1,
  82              _Range2&& __range2,
  83              _OutIter __result,
  84              _Comp __comp   = {},
  85              _Proj1 __proj1 = {},
  86              _Proj2 __proj2 = {}) const {
  87     auto __ret = std::__set_intersection<_RangeAlgPolicy>(
  88         ranges::begin(__range1),
  89         ranges::end(__range1),
  90         ranges::begin(__range2),
  91         ranges::end(__range2),
  92         std::move(__result),
  93         ranges::__make_projected_comp(__comp, __proj1, __proj2));
  94     return {std::move(__ret.__in1_), std::move(__ret.__in2_), std::move(__ret.__out_)};
  95   }
  96 };
  97
  98 } // namespace __set_intersection
  99
 100 inline namespace __cpo {
 101 inline constexpr auto set_intersection = __set_intersection::__fn{};
 102 } // namespace __cpo
 103 } // namespace ranges
 104
 105 _LIBCPP_END_NAMESPACE_STD
 106
 107 #endif // _LIBCPP_STD_VER >= 20
 108 #endif // _LIBCPP___ALGORITHM_RANGES_SET_INTERSECTION_H