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#if _LIBCPP_STD_VER > 17
34
35_LIBCPP_BEGIN_NAMESPACE_STD
36
37namespace ranges {
38
39template <class _InIter, class _OutIter>
40using set_difference_result = in_out_result<_InIter, _OutIter>;
41
42namespace __set_difference {
43
44struct __fn {
45  template <
46      input_iterator _InIter1,
47      sentinel_for<_InIter1> _Sent1,
48      input_iterator _InIter2,
49      sentinel_for<_InIter2> _Sent2,
50      weakly_incrementable _OutIter,
51      class _Comp  = less,
52      class _Proj1 = identity,
53      class _Proj2 = identity>
54    requires mergeable<_InIter1, _InIter2, _OutIter, _Comp, _Proj1, _Proj2>
55  _LIBCPP_HIDE_FROM_ABI constexpr set_difference_result<_InIter1, _OutIter> operator()(
56      _InIter1 __first1,
57      _Sent1 __last1,
58      _InIter2 __first2,
59      _Sent2 __last2,
60      _OutIter __result,
61      _Comp __comp   = {},
62      _Proj1 __proj1 = {},
63      _Proj2 __proj2 = {}) const {
64    auto __ret = std::__set_difference<_RangeAlgPolicy>(
65        __first1, __last1, __first2, __last2, __result, ranges::__make_projected_comp(__comp, __proj1, __proj2));
66    return {std::move(__ret.first), std::move(__ret.second)};
67  }
68
69  template <
70      input_range _Range1,
71      input_range _Range2,
72      weakly_incrementable _OutIter,
73      class _Comp  = less,
74      class _Proj1 = identity,
75      class _Proj2 = identity>
76    requires mergeable<iterator_t<_Range1>, iterator_t<_Range2>, _OutIter, _Comp, _Proj1, _Proj2>
77  _LIBCPP_HIDE_FROM_ABI constexpr set_difference_result<borrowed_iterator_t<_Range1>, _OutIter>
78    operator()(
79        _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
98inline 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 > 17
106#endif // _LIBCPP___ALGORITHM_RANGES_SET_DIFFERENCE_H
107