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