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> >
__set_difference(_InIter1 && __first1,_Sent1 && __last1,_InIter2 && __first2,_Sent2 && __last2,_OutIter && __result,_Comp && __comp)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>
set_difference(_InputIterator1 __first1,_InputIterator1 __last1,_InputIterator2 __first2,_InputIterator2 __last2,_OutputIterator __result,_Compare __comp)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>
set_difference(_InputIterator1 __first1,_InputIterator1 __last1,_InputIterator2 __first2,_InputIterator2 __last2,_OutputIterator __result)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