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_DIFFERENCE_H 10 #define _LIBCPP___ALGORITHM_SET_DIFFERENCE_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 <__functional/identity.h> 18 #include <__functional/invoke.h> 19 #include <__iterator/iterator_traits.h> 20 #include <__utility/move.h> 21 #include <__utility/pair.h> 22 #include <type_traits> 23 24 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 25 # pragma GCC system_header 26 #endif 27 28 _LIBCPP_BEGIN_NAMESPACE_STD 29 30 template <class _AlgPolicy, class _Comp, class _InIter1, class _Sent1, class _InIter2, class _Sent2, class _OutIter> 31 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<__remove_cvref_t<_InIter1>, __remove_cvref_t<_OutIter> > 32 __set_difference( 33 _InIter1&& __first1, _Sent1&& __last1, _InIter2&& __first2, _Sent2&& __last2, _OutIter&& __result, _Comp&& __comp) { 34 while (__first1 != __last1 && __first2 != __last2) { 35 if (__comp(*__first1, *__first2)) { 36 *__result = *__first1; 37 ++__first1; 38 ++__result; 39 } else if (__comp(*__first2, *__first1)) { 40 ++__first2; 41 } else { 42 ++__first1; 43 ++__first2; 44 } 45 } 46 return std::__copy<_AlgPolicy>(std::move(__first1), std::move(__last1), std::move(__result)); 47 } 48 49 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare> 50 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_difference( 51 _InputIterator1 __first1, 52 _InputIterator1 __last1, 53 _InputIterator2 __first2, 54 _InputIterator2 __last2, 55 _OutputIterator __result, 56 _Compare __comp) { 57 return std::__set_difference<_ClassicAlgPolicy, __comp_ref_type<_Compare> >( 58 __first1, __last1, __first2, __last2, __result, __comp) 59 .second; 60 } 61 62 template <class _InputIterator1, class _InputIterator2, class _OutputIterator> 63 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_difference( 64 _InputIterator1 __first1, 65 _InputIterator1 __last1, 66 _InputIterator2 __first2, 67 _InputIterator2 __last2, 68 _OutputIterator __result) { 69 return std::__set_difference<_ClassicAlgPolicy>( 70 __first1, 71 __last1, 72 __first2, 73 __last2, 74 __result, 75 __less<typename iterator_traits<_InputIterator1>::value_type, 76 typename iterator_traits<_InputIterator2>::value_type>()).second; 77 } 78 79 _LIBCPP_END_NAMESPACE_STD 80 81 #endif // _LIBCPP___ALGORITHM_SET_DIFFERENCE_H 82