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1 //===----------------------------------------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #ifndef _LIBCPP___ALGORITHM_SET_SYMMETRIC_DIFFERENCE_H
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10 #define _LIBCPP___ALGORITHM_SET_SYMMETRIC_DIFFERENCE_H
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11
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223
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12 #include <__algorithm/comp.h>
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221
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13 #include <__algorithm/comp_ref_type.h>
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14 #include <__algorithm/copy.h>
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252
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15 #include <__algorithm/iterator_operations.h>
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236
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16 #include <__config>
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221
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17 #include <__iterator/iterator_traits.h>
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236
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18 #include <__utility/move.h>
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19 #include <__utility/pair.h>
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221
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20
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21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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236
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22 # pragma GCC system_header
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221
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23 #endif
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24
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25 _LIBCPP_BEGIN_NAMESPACE_STD
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26
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236
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27 template <class _InIter1, class _InIter2, class _OutIter>
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28 struct __set_symmetric_difference_result {
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29 _InIter1 __in1_;
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30 _InIter2 __in2_;
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31 _OutIter __out_;
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32
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33 // need a constructor as C++03 aggregate init is hard
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34 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
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35 __set_symmetric_difference_result(_InIter1&& __in_iter1, _InIter2&& __in_iter2, _OutIter&& __out_iter)
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36 : __in1_(std::move(__in_iter1)), __in2_(std::move(__in_iter2)), __out_(std::move(__out_iter)) {}
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37 };
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38
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252
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39 template <class _AlgPolicy, class _Compare, class _InIter1, class _Sent1, class _InIter2, class _Sent2, class _OutIter>
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236
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40 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __set_symmetric_difference_result<_InIter1, _InIter2, _OutIter>
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41 __set_symmetric_difference(
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42 _InIter1 __first1, _Sent1 __last1, _InIter2 __first2, _Sent2 __last2, _OutIter __result, _Compare&& __comp) {
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43 while (__first1 != __last1) {
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44 if (__first2 == __last2) {
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45 auto __ret1 = std::__copy<_AlgPolicy>(std::move(__first1), std::move(__last1), std::move(__result));
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46 return __set_symmetric_difference_result<_InIter1, _InIter2, _OutIter>(
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47 std::move(__ret1.first), std::move(__first2), std::move((__ret1.second)));
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221
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48 }
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49 if (__comp(*__first1, *__first2)) {
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50 *__result = *__first1;
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51 ++__result;
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52 ++__first1;
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53 } else {
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54 if (__comp(*__first2, *__first1)) {
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55 *__result = *__first2;
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56 ++__result;
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57 } else {
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58 ++__first1;
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59 }
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60 ++__first2;
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61 }
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62 }
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63 auto __ret2 = std::__copy<_AlgPolicy>(std::move(__first2), std::move(__last2), std::move(__result));
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64 return __set_symmetric_difference_result<_InIter1, _InIter2, _OutIter>(
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65 std::move(__first1), std::move(__ret2.first), std::move((__ret2.second)));
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221
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66 }
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67
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68 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare>
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236
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69 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_symmetric_difference(
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70 _InputIterator1 __first1,
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71 _InputIterator1 __last1,
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72 _InputIterator2 __first2,
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73 _InputIterator2 __last2,
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74 _OutputIterator __result,
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75 _Compare __comp) {
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76 return std::__set_symmetric_difference<_ClassicAlgPolicy, __comp_ref_type<_Compare> >(
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236
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77 std::move(__first1),
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78 std::move(__last1),
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79 std::move(__first2),
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80 std::move(__last2),
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81 std::move(__result),
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82 __comp)
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83 .__out_;
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221
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84 }
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85
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86 template <class _InputIterator1, class _InputIterator2, class _OutputIterator>
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236
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87 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_symmetric_difference(
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88 _InputIterator1 __first1,
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89 _InputIterator1 __last1,
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90 _InputIterator2 __first2,
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91 _InputIterator2 __last2,
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92 _OutputIterator __result) {
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93 return std::set_symmetric_difference(
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94 std::move(__first1),
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95 std::move(__last1),
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96 std::move(__first2),
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97 std::move(__last2),
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98 std::move(__result),
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252
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99 __less<>());
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221
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100 }
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101
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102 _LIBCPP_END_NAMESPACE_STD
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103
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104 #endif // _LIBCPP___ALGORITHM_SET_SYMMETRIC_DIFFERENCE_H
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