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_UNION_H 10 #define _LIBCPP___ALGORITHM_SET_UNION_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 30 template <class _InIter1, class _InIter2, class _OutIter> 31 struct __set_union_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_union_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 42 template <class _AlgPolicy, class _Compare, class _InIter1, class _Sent1, class _InIter2, class _Sent2, class _OutIter> 43 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __set_union_result<_InIter1, _InIter2, _OutIter> __set_union( 44 _InIter1 __first1, _Sent1 __last1, _InIter2 __first2, _Sent2 __last2, _OutIter __result, _Compare&& __comp) { 45 for (; __first1 != __last1; ++__result) { 46 if (__first2 == __last2) { 47 auto __ret1 = std::__copy<_AlgPolicy>(std::move(__first1), std::move(__last1), std::move(__result)); 48 return __set_union_result<_InIter1, _InIter2, _OutIter>( 49 std::move(__ret1.first), std::move(__first2), std::move((__ret1.second))); 50 } 51 if (__comp(*__first2, *__first1)) { 52 *__result = *__first2; 53 ++__first2; 54 } else { 55 if (!__comp(*__first1, *__first2)) { 56 ++__first2; 57 } 58 *__result = *__first1; 59 ++__first1; 60 } 61 } 62 auto __ret2 = std::__copy<_AlgPolicy>(std::move(__first2), std::move(__last2), std::move(__result)); 63 return __set_union_result<_InIter1, _InIter2, _OutIter>( 64 std::move(__first1), std::move(__ret2.first), std::move((__ret2.second))); 65 } 66 67 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare> 68 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_union( 69 _InputIterator1 __first1, 70 _InputIterator1 __last1, 71 _InputIterator2 __first2, 72 _InputIterator2 __last2, 73 _OutputIterator __result, 74 _Compare __comp) { 75 return std::__set_union<_ClassicAlgPolicy, __comp_ref_type<_Compare> >( 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_SINCE_CXX20 _OutputIterator set_union( 87 _InputIterator1 __first1, 88 _InputIterator1 __last1, 89 _InputIterator2 __first2, 90 _InputIterator2 __last2, 91 _OutputIterator __result) { 92 return std::set_union( 93 std::move(__first1), 94 std::move(__last1), 95 std::move(__first2), 96 std::move(__last2), 97 std::move(__result), 98 __less<>()); 99 } 100 101 _LIBCPP_END_NAMESPACE_STD 102 103 _LIBCPP_POP_MACROS 104 105 #endif // _LIBCPP___ALGORITHM_SET_UNION_H 106