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 19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 20 # pragma GCC system_header 21 #endif 22 23 _LIBCPP_BEGIN_NAMESPACE_STD 24 25 template <class _InIter1, class _InIter2, class _OutIter> 26 struct __set_symmetric_difference_result { 27 _InIter1 __in1_; 28 _InIter2 __in2_; 29 _OutIter __out_; 30 31 // need a constructor as C++03 aggregate init is hard 32 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 33 __set_symmetric_difference_result(_InIter1&& __in_iter1, _InIter2&& __in_iter2, _OutIter&& __out_iter) 34 : __in1_(std::move(__in_iter1)), __in2_(std::move(__in_iter2)), __out_(std::move(__out_iter)) {} 35 }; 36 37 template <class _Compare, class _InIter1, class _Sent1, class _InIter2, class _Sent2, class _OutIter> 38 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 __set_symmetric_difference_result<_InIter1, _InIter2, _OutIter> 39 __set_symmetric_difference( 40 _InIter1 __first1, _Sent1 __last1, _InIter2 __first2, _Sent2 __last2, _OutIter __result, _Compare&& __comp) { 41 while (__first1 != __last1) { 42 if (__first2 == __last2) { 43 auto __ret1 = std::__copy_impl(std::move(__first1), std::move(__last1), std::move(__result)); 44 return __set_symmetric_difference_result<_InIter1, _InIter2, _OutIter>( 45 std::move(__ret1.first), std::move(__first2), std::move((__ret1.second))); 46 } 47 if (__comp(*__first1, *__first2)) { 48 *__result = *__first1; 49 ++__result; 50 ++__first1; 51 } else { 52 if (__comp(*__first2, *__first1)) { 53 *__result = *__first2; 54 ++__result; 55 } else { 56 ++__first1; 57 } 58 ++__first2; 59 } 60 } 61 auto __ret2 = std::__copy_impl(std::move(__first2), std::move(__last2), std::move(__result)); 62 return __set_symmetric_difference_result<_InIter1, _InIter2, _OutIter>( 63 std::move(__first1), std::move(__ret2.first), std::move((__ret2.second))); 64 } 65 66 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare> 67 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator set_symmetric_difference( 68 _InputIterator1 __first1, 69 _InputIterator1 __last1, 70 _InputIterator2 __first2, 71 _InputIterator2 __last2, 72 _OutputIterator __result, 73 _Compare __comp) { 74 typedef typename __comp_ref_type<_Compare>::type _Comp_ref; 75 return std::__set_symmetric_difference<_Comp_ref>( 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 85 template <class _InputIterator1, class _InputIterator2, class _OutputIterator> 86 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator set_symmetric_difference( 87 _InputIterator1 __first1, 88 _InputIterator1 __last1, 89 _InputIterator2 __first2, 90 _InputIterator2 __last2, 91 _OutputIterator __result) { 92 return std::set_symmetric_difference( 93 std::move(__first1), 94 std::move(__last1), 95 std::move(__first2), 96 std::move(__last2), 97 std::move(__result), 98 __less<typename iterator_traits<_InputIterator1>::value_type, 99 typename iterator_traits<_InputIterator2>::value_type>()); 100 } 101 102 _LIBCPP_END_NAMESPACE_STD 103 104 #endif // _LIBCPP___ALGORITHM_SET_SYMMETRIC_DIFFERENCE_H 105