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