1fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 2fe6060f1SDimitry Andric // 3fe6060f1SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4fe6060f1SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5fe6060f1SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6fe6060f1SDimitry Andric // 7fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 8fe6060f1SDimitry Andric 9fe6060f1SDimitry Andric #ifndef _LIBCPP___ALGORITHM_SET_DIFFERENCE_H 10fe6060f1SDimitry Andric #define _LIBCPP___ALGORITHM_SET_DIFFERENCE_H 11fe6060f1SDimitry Andric 12fe6060f1SDimitry Andric #include <__algorithm/comp.h> 13fe6060f1SDimitry Andric #include <__algorithm/comp_ref_type.h> 14fe6060f1SDimitry Andric #include <__algorithm/copy.h> 15bdd1243dSDimitry Andric #include <__algorithm/iterator_operations.h> 1604eeddc0SDimitry Andric #include <__config> 17753f127fSDimitry Andric #include <__functional/identity.h> 18753f127fSDimitry Andric #include <__functional/invoke.h> 19fe6060f1SDimitry Andric #include <__iterator/iterator_traits.h> 2006c3fb27SDimitry Andric #include <__type_traits/remove_cvref.h> 21753f127fSDimitry Andric #include <__utility/move.h> 22753f127fSDimitry Andric #include <__utility/pair.h> 23fe6060f1SDimitry Andric 24fe6060f1SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 25fe6060f1SDimitry Andric # pragma GCC system_header 26fe6060f1SDimitry Andric #endif 27fe6060f1SDimitry Andric 28*b3edf446SDimitry Andric _LIBCPP_PUSH_MACROS 29*b3edf446SDimitry Andric #include <__undef_macros> 30*b3edf446SDimitry Andric 31fe6060f1SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 32fe6060f1SDimitry Andric 33bdd1243dSDimitry Andric template <class _AlgPolicy, class _Comp, class _InIter1, class _Sent1, class _InIter2, class _Sent2, class _OutIter> 34bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<__remove_cvref_t<_InIter1>, __remove_cvref_t<_OutIter> > 35753f127fSDimitry Andric __set_difference( 36753f127fSDimitry Andric _InIter1&& __first1, _Sent1&& __last1, _InIter2&& __first2, _Sent2&& __last2, _OutIter&& __result, _Comp&& __comp) { 37753f127fSDimitry Andric while (__first1 != __last1 && __first2 != __last2) { 38753f127fSDimitry Andric if (__comp(*__first1, *__first2)) { 39fe6060f1SDimitry Andric *__result = *__first1; 40fe6060f1SDimitry Andric ++__first1; 41753f127fSDimitry Andric ++__result; 42753f127fSDimitry Andric } else if (__comp(*__first2, *__first1)) { 43753f127fSDimitry Andric ++__first2; 44753f127fSDimitry Andric } else { 45fe6060f1SDimitry Andric ++__first1; 46fe6060f1SDimitry Andric ++__first2; 47fe6060f1SDimitry Andric } 48fe6060f1SDimitry Andric } 49bdd1243dSDimitry Andric return std::__copy<_AlgPolicy>(std::move(__first1), std::move(__last1), std::move(__result)); 50fe6060f1SDimitry Andric } 51fe6060f1SDimitry Andric 52fe6060f1SDimitry Andric template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare> 53bdd1243dSDimitry Andric inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_difference( 54753f127fSDimitry Andric _InputIterator1 __first1, 55753f127fSDimitry Andric _InputIterator1 __last1, 56753f127fSDimitry Andric _InputIterator2 __first2, 57753f127fSDimitry Andric _InputIterator2 __last2, 58753f127fSDimitry Andric _OutputIterator __result, 59753f127fSDimitry Andric _Compare __comp) { 60bdd1243dSDimitry Andric return std::__set_difference<_ClassicAlgPolicy, __comp_ref_type<_Compare> >( 61bdd1243dSDimitry Andric __first1, __last1, __first2, __last2, __result, __comp) 62bdd1243dSDimitry Andric .second; 63fe6060f1SDimitry Andric } 64fe6060f1SDimitry Andric 65fe6060f1SDimitry Andric template <class _InputIterator1, class _InputIterator2, class _OutputIterator> 66bdd1243dSDimitry Andric inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_difference( 67753f127fSDimitry Andric _InputIterator1 __first1, 68753f127fSDimitry Andric _InputIterator1 __last1, 69753f127fSDimitry Andric _InputIterator2 __first2, 70753f127fSDimitry Andric _InputIterator2 __last2, 71753f127fSDimitry Andric _OutputIterator __result) { 7206c3fb27SDimitry Andric return std::__set_difference<_ClassicAlgPolicy>(__first1, __last1, __first2, __last2, __result, __less<>()).second; 73fe6060f1SDimitry Andric } 74fe6060f1SDimitry Andric 75fe6060f1SDimitry Andric _LIBCPP_END_NAMESPACE_STD 76fe6060f1SDimitry Andric 77*b3edf446SDimitry Andric _LIBCPP_POP_MACROS 78*b3edf446SDimitry Andric 79fe6060f1SDimitry Andric #endif // _LIBCPP___ALGORITHM_SET_DIFFERENCE_H 80