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_SET_UNION_H
10#define _LIBCPP___ALGORITHM_SET_UNION_H
11
12#include <__algorithm/comp.h>
13#include <__algorithm/comp_ref_type.h>
14#include <__algorithm/copy.h>
15#include <__algorithm/iterator_operations.h>
16#include <__config>
17#include <__iterator/iterator_traits.h>
18#include <__utility/move.h>
19#include <__utility/pair.h>
20
21#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
22# pragma GCC system_header
23#endif
24
25_LIBCPP_PUSH_MACROS
26#include <__undef_macros>
27
28_LIBCPP_BEGIN_NAMESPACE_STD
29
30template <class _InIter1, class _InIter2, class _OutIter>
31struct __set_union_result {
32 _InIter1 __in1_;
33 _InIter2 __in2_;
34 _OutIter __out_;
35
36 // need a constructor as C++03 aggregate init is hard
37 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
38 __set_union_result(_InIter1&& __in_iter1, _InIter2&& __in_iter2, _OutIter&& __out_iter)
39 : __in1_(std::move(__in_iter1)), __in2_(std::move(__in_iter2)), __out_(std::move(__out_iter)) {}
40};
41
42template <class _AlgPolicy, class _Compare, class _InIter1, class _Sent1, class _InIter2, class _Sent2, class _OutIter>
43_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __set_union_result<_InIter1, _InIter2, _OutIter> __set_union(
44 _InIter1 __first1, _Sent1 __last1, _InIter2 __first2, _Sent2 __last2, _OutIter __result, _Compare&& __comp) {
45 for (; __first1 != __last1; ++__result) {
46 if (__first2 == __last2) {
47 auto __ret1 = std::__copy<_AlgPolicy>(std::move(__first1), std::move(__last1), std::move(__result));
48 return __set_union_result<_InIter1, _InIter2, _OutIter>(
49 std::move(__ret1.first), std::move(__first2), std::move((__ret1.second)));
50 }
51 if (__comp(*__first2, *__first1)) {
52 *__result = *__first2;
53 ++__first2;
54 } else {
55 if (!__comp(*__first1, *__first2)) {
56 ++__first2;
57 }
58 *__result = *__first1;
59 ++__first1;
60 }
61 }
62 auto __ret2 = std::__copy<_AlgPolicy>(std::move(__first2), std::move(__last2), std::move(__result));
63 return __set_union_result<_InIter1, _InIter2, _OutIter>(
64 std::move(__first1), std::move(__ret2.first), std::move((__ret2.second)));
65}
66
67template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare>
68_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_union(
69 _InputIterator1 __first1,
70 _InputIterator1 __last1,
71 _InputIterator2 __first2,
72 _InputIterator2 __last2,
73 _OutputIterator __result,
74 _Compare __comp) {
75 return std::__set_union<_ClassicAlgPolicy, __comp_ref_type<_Compare> >(
76 std::move(__first1),
77 std::move(__last1),
78 std::move(__first2),
79 std::move(__last2),
80 std::move(__result),
81 __comp)
82 .__out_;
83}
84
85template <class _InputIterator1, class _InputIterator2, class _OutputIterator>
86_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_union(
87 _InputIterator1 __first1,
88 _InputIterator1 __last1,
89 _InputIterator2 __first2,
90 _InputIterator2 __last2,
91 _OutputIterator __result) {
92 return std::set_union(
93 std::move(__first1),
94 std::move(__last1),
95 std::move(__first2),
96 std::move(__last2),
97 std::move(__result),
98 __less<>());
99}
100
101_LIBCPP_END_NAMESPACE_STD
102
103_LIBCPP_POP_MACROS
104
105#endif // _LIBCPP___ALGORITHM_SET_UNION_H
106