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