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