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_RANGES_SET_DIFFERENCE_H
10 #define _LIBCPP___ALGORITHM_RANGES_SET_DIFFERENCE_H
11 
12 #include <__algorithm/in_out_result.h>
13 #include <__algorithm/iterator_operations.h>
14 #include <__algorithm/make_projected.h>
15 #include <__algorithm/set_difference.h>
16 #include <__config>
17 #include <__functional/identity.h>
18 #include <__functional/invoke.h>
19 #include <__functional/ranges_operations.h>
20 #include <__iterator/concepts.h>
21 #include <__iterator/mergeable.h>
22 #include <__ranges/access.h>
23 #include <__ranges/concepts.h>
24 #include <__ranges/dangling.h>
25 #include <__type_traits/decay.h>
26 #include <__utility/move.h>
27 #include <__utility/pair.h>
28 
29 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
30 #  pragma GCC system_header
31 #endif
32 
33 _LIBCPP_PUSH_MACROS
34 #include <__undef_macros>
35 
36 #if _LIBCPP_STD_VER >= 20
37 
38 _LIBCPP_BEGIN_NAMESPACE_STD
39 
40 namespace ranges {
41 
42 template <class _InIter, class _OutIter>
43 using set_difference_result = in_out_result<_InIter, _OutIter>;
44 
45 namespace __set_difference {
46 
47 struct __fn {
48   template <input_iterator _InIter1,
49             sentinel_for<_InIter1> _Sent1,
50             input_iterator _InIter2,
51             sentinel_for<_InIter2> _Sent2,
52             weakly_incrementable _OutIter,
53             class _Comp  = less,
54             class _Proj1 = identity,
55             class _Proj2 = identity>
56     requires mergeable<_InIter1, _InIter2, _OutIter, _Comp, _Proj1, _Proj2>
operator__fn57   _LIBCPP_HIDE_FROM_ABI constexpr set_difference_result<_InIter1, _OutIter> operator()(
58       _InIter1 __first1,
59       _Sent1 __last1,
60       _InIter2 __first2,
61       _Sent2 __last2,
62       _OutIter __result,
63       _Comp __comp   = {},
64       _Proj1 __proj1 = {},
65       _Proj2 __proj2 = {}) const {
66     auto __ret = std::__set_difference<_RangeAlgPolicy>(
67         __first1, __last1, __first2, __last2, __result, ranges::__make_projected_comp(__comp, __proj1, __proj2));
68     return {std::move(__ret.first), std::move(__ret.second)};
69   }
70 
71   template <input_range _Range1,
72             input_range _Range2,
73             weakly_incrementable _OutIter,
74             class _Comp  = less,
75             class _Proj1 = identity,
76             class _Proj2 = identity>
77     requires mergeable<iterator_t<_Range1>, iterator_t<_Range2>, _OutIter, _Comp, _Proj1, _Proj2>
78   _LIBCPP_HIDE_FROM_ABI constexpr set_difference_result<borrowed_iterator_t<_Range1>, _OutIter>
operator__fn79   operator()(_Range1&& __range1,
80              _Range2&& __range2,
81              _OutIter __result,
82              _Comp __comp   = {},
83              _Proj1 __proj1 = {},
84              _Proj2 __proj2 = {}) const {
85     auto __ret = std::__set_difference<_RangeAlgPolicy>(
86         ranges::begin(__range1),
87         ranges::end(__range1),
88         ranges::begin(__range2),
89         ranges::end(__range2),
90         __result,
91         ranges::__make_projected_comp(__comp, __proj1, __proj2));
92     return {std::move(__ret.first), std::move(__ret.second)};
93   }
94 };
95 
96 } // namespace __set_difference
97 
98 inline namespace __cpo {
99 inline constexpr auto set_difference = __set_difference::__fn{};
100 } // namespace __cpo
101 } // namespace ranges
102 
103 _LIBCPP_END_NAMESPACE_STD
104 
105 #endif // _LIBCPP_STD_VER >= 20
106 
107 _LIBCPP_POP_MACROS
108 
109 #endif // _LIBCPP___ALGORITHM_RANGES_SET_DIFFERENCE_H
110