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 <__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_BEGIN_NAMESPACE_STD 25 26 template <class _InIter1, class _InIter2, class _OutIter> 27 struct __set_union_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_union_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 _Compare, class _InIter1, class _Sent1, class _InIter2, class _Sent2, class _OutIter> 39 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __set_union_result<_InIter1, _InIter2, _OutIter> __set_union( 40 _InIter1 __first1, _Sent1 __last1, _InIter2 __first2, _Sent2 __last2, _OutIter __result, _Compare&& __comp) { 41 for (; __first1 != __last1; ++__result) { 42 if (__first2 == __last2) { 43 auto __ret1 = std::__copy_impl(std::move(__first1), std::move(__last1), std::move(__result)); 44 return __set_union_result<_InIter1, _InIter2, _OutIter>( 45 std::move(__ret1.first), std::move(__first2), std::move((__ret1.second))); 46 } 47 if (__comp(*__first2, *__first1)) { 48 *__result = *__first2; 49 ++__first2; 50 } else { 51 if (!__comp(*__first1, *__first2)) { 52 ++__first2; 53 } 54 *__result = *__first1; 55 ++__first1; 56 } 57 } 58 auto __ret2 = std::__copy_impl(std::move(__first2), std::move(__last2), std::move(__result)); 59 return __set_union_result<_InIter1, _InIter2, _OutIter>( 60 std::move(__first1), std::move(__ret2.first), std::move((__ret2.second))); 61 } 62 63 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare> 64 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_union( 65 _InputIterator1 __first1, 66 _InputIterator1 __last1, 67 _InputIterator2 __first2, 68 _InputIterator2 __last2, 69 _OutputIterator __result, 70 _Compare __comp) { 71 typedef typename __comp_ref_type<_Compare>::type _Comp_ref; 72 return std::__set_union<_Comp_ref>( 73 std::move(__first1), 74 std::move(__last1), 75 std::move(__first2), 76 std::move(__last2), 77 std::move(__result), 78 __comp) 79 .__out_; 80 } 81 82 template <class _InputIterator1, class _InputIterator2, class _OutputIterator> 83 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_union( 84 _InputIterator1 __first1, 85 _InputIterator1 __last1, 86 _InputIterator2 __first2, 87 _InputIterator2 __last2, 88 _OutputIterator __result) { 89 return std::set_union( 90 std::move(__first1), 91 std::move(__last1), 92 std::move(__first2), 93 std::move(__last2), 94 std::move(__result), 95 __less<typename iterator_traits<_InputIterator1>::value_type, 96 typename iterator_traits<_InputIterator2>::value_type>()); 97 } 98 99 _LIBCPP_END_NAMESPACE_STD 100 101 #endif // _LIBCPP___ALGORITHM_SET_UNION_H 102