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_SYMMETRIC_DIFFERENCE_H
10#define _LIBCPP___ALGORITHM_SET_SYMMETRIC_DIFFERENCE_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_symmetric_difference_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_symmetric_difference_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_symmetric_difference_result<_InIter1, _InIter2, _OutIter>
44__set_symmetric_difference(
45    _InIter1 __first1, _Sent1 __last1, _InIter2 __first2, _Sent2 __last2, _OutIter __result, _Compare&& __comp) {
46  while (__first1 != __last1) {
47    if (__first2 == __last2) {
48      auto __ret1 = std::__copy<_AlgPolicy>(std::move(__first1), std::move(__last1), std::move(__result));
49      return __set_symmetric_difference_result<_InIter1, _InIter2, _OutIter>(
50          std::move(__ret1.first), std::move(__first2), std::move((__ret1.second)));
51    }
52    if (__comp(*__first1, *__first2)) {
53      *__result = *__first1;
54      ++__result;
55      ++__first1;
56    } else {
57      if (__comp(*__first2, *__first1)) {
58        *__result = *__first2;
59        ++__result;
60      } else {
61        ++__first1;
62      }
63      ++__first2;
64    }
65  }
66  auto __ret2 = std::__copy<_AlgPolicy>(std::move(__first2), std::move(__last2), std::move(__result));
67  return __set_symmetric_difference_result<_InIter1, _InIter2, _OutIter>(
68      std::move(__first1), std::move(__ret2.first), std::move((__ret2.second)));
69}
70
71template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare>
72_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_symmetric_difference(
73    _InputIterator1 __first1,
74    _InputIterator1 __last1,
75    _InputIterator2 __first2,
76    _InputIterator2 __last2,
77    _OutputIterator __result,
78    _Compare __comp) {
79  return std::__set_symmetric_difference<_ClassicAlgPolicy, __comp_ref_type<_Compare> >(
80             std::move(__first1),
81             std::move(__last1),
82             std::move(__first2),
83             std::move(__last2),
84             std::move(__result),
85             __comp)
86      .__out_;
87}
88
89template <class _InputIterator1, class _InputIterator2, class _OutputIterator>
90_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_symmetric_difference(
91    _InputIterator1 __first1,
92    _InputIterator1 __last1,
93    _InputIterator2 __first2,
94    _InputIterator2 __last2,
95    _OutputIterator __result) {
96  return std::set_symmetric_difference(
97      std::move(__first1),
98      std::move(__last1),
99      std::move(__first2),
100      std::move(__last2),
101      std::move(__result),
102      __less<>());
103}
104
105_LIBCPP_END_NAMESPACE_STD
106
107_LIBCPP_POP_MACROS
108
109#endif // _LIBCPP___ALGORITHM_SET_SYMMETRIC_DIFFERENCE_H
110