libcxx/include/__cxx03/__algorithm/ranges_set_union.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_UNION_H
  10 #define _LIBCPP___ALGORITHM_RANGES_SET_UNION_H
  11
  12 #include <__cxx03/__algorithm/in_in_out_result.h>
  13 #include <__cxx03/__algorithm/iterator_operations.h>
  14 #include <__cxx03/__algorithm/make_projected.h>
  15 #include <__cxx03/__algorithm/set_union.h>
  16 #include <__cxx03/__config>
  17 #include <__cxx03/__functional/identity.h>
  18 #include <__cxx03/__functional/invoke.h>
  19 #include <__cxx03/__functional/ranges_operations.h>
  20 #include <__cxx03/__iterator/concepts.h>
  21 #include <__cxx03/__iterator/iterator_traits.h>
  22 #include <__cxx03/__iterator/mergeable.h>
  23 #include <__cxx03/__iterator/projected.h>
  24 #include <__cxx03/__ranges/access.h>
  25 #include <__cxx03/__ranges/concepts.h>
  26 #include <__cxx03/__ranges/dangling.h>
  27 #include <__cxx03/__utility/forward.h>
  28 #include <__cxx03/__utility/move.h>
  29
  30 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  31 #  pragma GCC system_header
  32 #endif
  33
  34 _LIBCPP_PUSH_MACROS
  35 #include <__cxx03/__undef_macros>
  36
  37 #if _LIBCPP_STD_VER >= 20
  38
  39 _LIBCPP_BEGIN_NAMESPACE_STD
  40
  41 namespace ranges {
  42
  43 template <class _InIter1, class _InIter2, class _OutIter>
  44 using set_union_result = in_in_out_result<_InIter1, _InIter2, _OutIter>;
  45
  46 namespace __set_union {
  47
  48 struct __fn {
  49   template <input_iterator _InIter1,
  50             sentinel_for<_InIter1> _Sent1,
  51             input_iterator _InIter2,
  52             sentinel_for<_InIter2> _Sent2,
  53             weakly_incrementable _OutIter,
  54             class _Comp  = ranges::less,
  55             class _Proj1 = identity,
  56             class _Proj2 = identity>
  57     requires mergeable<_InIter1, _InIter2, _OutIter, _Comp, _Proj1, _Proj2>
  58   _LIBCPP_HIDE_FROM_ABI constexpr set_union_result<_InIter1, _InIter2, _OutIter> operator()(
  59       _InIter1 __first1,
  60       _Sent1 __last1,
  61       _InIter2 __first2,
  62       _Sent2 __last2,
  63       _OutIter __result,
  64       _Comp __comp   = {},
  65       _Proj1 __proj1 = {},
  66       _Proj2 __proj2 = {}) const {
  67     auto __ret = std::__set_union<_RangeAlgPolicy>(
  68         std::move(__first1),
  69         std::move(__last1),
  70         std::move(__first2),
  71         std::move(__last2),
  72         std::move(__result),
  73         ranges::__make_projected_comp(__comp, __proj1, __proj2));
  74     return {std::move(__ret.__in1_), std::move(__ret.__in2_), std::move(__ret.__out_)};
  75   }
  76
  77   template <input_range _Range1,
  78             input_range _Range2,
  79             weakly_incrementable _OutIter,
  80             class _Comp  = ranges::less,
  81             class _Proj1 = identity,
  82             class _Proj2 = identity>
  83     requires mergeable<iterator_t<_Range1>, iterator_t<_Range2>, _OutIter, _Comp, _Proj1, _Proj2>
  84   _LIBCPP_HIDE_FROM_ABI constexpr set_union_result<borrowed_iterator_t<_Range1>, borrowed_iterator_t<_Range2>, _OutIter>
  85   operator()(_Range1&& __range1,
  86              _Range2&& __range2,
  87              _OutIter __result,
  88              _Comp __comp   = {},
  89              _Proj1 __proj1 = {},
  90              _Proj2 __proj2 = {}) const {
  91     auto __ret = std::__set_union<_RangeAlgPolicy>(
  92         ranges::begin(__range1),
  93         ranges::end(__range1),
  94         ranges::begin(__range2),
  95         ranges::end(__range2),
  96         std::move(__result),
  97         ranges::__make_projected_comp(__comp, __proj1, __proj2));
  98     return {std::move(__ret.__in1_), std::move(__ret.__in2_), std::move(__ret.__out_)};
  99   }
 100 };
 101
 102 } // namespace __set_union
 103
 104 inline namespace __cpo {
 105 inline constexpr auto set_union = __set_union::__fn{};
 106 } // namespace __cpo
 107 } // namespace ranges
 108
 109 _LIBCPP_END_NAMESPACE_STD
 110
 111 #endif // _LIBCPP_STD_VER >= 20
 112
 113 _LIBCPP_POP_MACROS
 114
 115 #endif // _LIBCPP___ALGORITHM_RANGES_SET_UNION_H