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 <__config> 16 #include <__iterator/iterator_traits.h> 17 #include <__utility/move.h> 18 #include <__utility/pair.h> 19 20 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 21 # pragma GCC system_header 22 #endif 23 24 _LIBCPP_PUSH_MACROS 25 #include <__undef_macros> 26 27 _LIBCPP_BEGIN_NAMESPACE_STD 28 29 template <class _InIter1, class _InIter2, class _OutIter> 30 struct __set_symmetric_difference_result { 31 _InIter1 __in1_; 32 _InIter2 __in2_; 33 _OutIter __out_; 34 35 // need a constructor as C++03 aggregate init is hard 36 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 37 __set_symmetric_difference_result(_InIter1&& __in_iter1, _InIter2&& __in_iter2, _OutIter&& __out_iter) 38 : __in1_(std::move(__in_iter1)), __in2_(std::move(__in_iter2)), __out_(std::move(__out_iter)) {} 39 }; 40 41 template <class _Compare, class _InIter1, class _Sent1, class _InIter2, class _Sent2, class _OutIter> 42 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __set_symmetric_difference_result<_InIter1, _InIter2, _OutIter> 43 __set_symmetric_difference( 44 _InIter1 __first1, _Sent1 __last1, _InIter2 __first2, _Sent2 __last2, _OutIter __result, _Compare&& __comp) { 45 while (__first1 != __last1) { 46 if (__first2 == __last2) { 47 auto __ret1 = std::__copy(std::move(__first1), std::move(__last1), std::move(__result)); 48 return __set_symmetric_difference_result<_InIter1, _InIter2, _OutIter>( 49 std::move(__ret1.first), std::move(__first2), std::move((__ret1.second))); 50 } 51 if (__comp(*__first1, *__first2)) { 52 *__result = *__first1; 53 ++__result; 54 ++__first1; 55 } else { 56 if (__comp(*__first2, *__first1)) { 57 *__result = *__first2; 58 ++__result; 59 } else { 60 ++__first1; 61 } 62 ++__first2; 63 } 64 } 65 auto __ret2 = std::__copy(std::move(__first2), std::move(__last2), std::move(__result)); 66 return __set_symmetric_difference_result<_InIter1, _InIter2, _OutIter>( 67 std::move(__first1), std::move(__ret2.first), std::move((__ret2.second))); 68 } 69 70 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare> 71 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_symmetric_difference( 72 _InputIterator1 __first1, 73 _InputIterator1 __last1, 74 _InputIterator2 __first2, 75 _InputIterator2 __last2, 76 _OutputIterator __result, 77 _Compare __comp) { 78 return std::__set_symmetric_difference<__comp_ref_type<_Compare> >( 79 std::move(__first1), 80 std::move(__last1), 81 std::move(__first2), 82 std::move(__last2), 83 std::move(__result), 84 __comp) 85 .__out_; 86 } 87 88 template <class _InputIterator1, class _InputIterator2, class _OutputIterator> 89 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_symmetric_difference( 90 _InputIterator1 __first1, 91 _InputIterator1 __last1, 92 _InputIterator2 __first2, 93 _InputIterator2 __last2, 94 _OutputIterator __result) { 95 return std::set_symmetric_difference( 96 std::move(__first1), 97 std::move(__last1), 98 std::move(__first2), 99 std::move(__last2), 100 std::move(__result), 101 __less<>()); 102 } 103 104 _LIBCPP_END_NAMESPACE_STD 105 106 _LIBCPP_POP_MACROS 107 108 #endif // _LIBCPP___ALGORITHM_SET_SYMMETRIC_DIFFERENCE_H 109