1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___ITERATOR_CONCEPTS_H
#define _LIBCPP___ITERATOR_CONCEPTS_H
#include <__config>
#include <__iterator/incrementable_traits.h>
#include <__iterator/iter_move.h>
#include <__iterator/iterator_traits.h>
#include <__iterator/readable_traits.h>
#include <__memory/pointer_traits.h>
#include <concepts>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
#if !defined(_LIBCPP_HAS_NO_RANGES)
// clang-format off
// [iterator.concept.readable]
template<class _In>
concept __indirectly_readable_impl =
requires(const _In __i) {
typename iter_value_t<_In>;
typename iter_reference_t<_In>;
typename iter_rvalue_reference_t<_In>;
{ *__i } -> same_as<iter_reference_t<_In> >;
{ ranges::iter_move(__i) } -> same_as<iter_rvalue_reference_t<_In> >;
} &&
common_reference_with<iter_reference_t<_In>&&, iter_value_t<_In>&> &&
common_reference_with<iter_reference_t<_In>&&, iter_rvalue_reference_t<_In>&&> &&
common_reference_with<iter_rvalue_reference_t<_In>&&, const iter_value_t<_In>&>;
template<class _In>
concept indirectly_readable = __indirectly_readable_impl<remove_cvref_t<_In> >;
// [iterator.concept.writable]
template<class _Out, class _Tp>
concept indirectly_writable =
requires(_Out&& __o, _Tp&& __t) {
*__o = _VSTD::forward<_Tp>(__t); // not required to be equality-preserving
*_VSTD::forward<_Out>(__o) = _VSTD::forward<_Tp>(__t); // not required to be equality-preserving
const_cast<const iter_reference_t<_Out>&&>(*__o) = _VSTD::forward<_Tp>(__t); // not required to be equality-preserving
const_cast<const iter_reference_t<_Out>&&>(*_VSTD::forward<_Out>(__o)) = _VSTD::forward<_Tp>(__t); // not required to be equality-preserving
};
// [iterator.concept.winc]
template<class _Tp>
concept __integer_like = integral<_Tp> && !same_as<_Tp, bool>;
template<class _Tp>
concept __signed_integer_like = signed_integral<_Tp>;
template<class _Ip>
concept weakly_incrementable =
default_initializable<_Ip> &&
movable<_Ip> &&
requires(_Ip __i) {
typename iter_difference_t<_Ip>;
requires __signed_integer_like<iter_difference_t<_Ip> >;
{ ++__i } -> same_as<_Ip&>; // not required to be equality-preserving
__i++; // not required to be equality-preserving
};
// [iterator.concept.inc]
template<class _Ip>
concept incrementable =
regular<_Ip> &&
weakly_incrementable<_Ip> &&
requires(_Ip __i) {
{ __i++ } -> same_as<_Ip>;
};
// [iterator.concept.iterator]
template<class _Ip>
concept input_or_output_iterator =
requires(_Ip __i) {
{ *__i } -> __referenceable;
} &&
weakly_incrementable<_Ip>;
// [iterator.concept.sentinel]
template<class _Sp, class _Ip>
concept sentinel_for =
semiregular<_Sp> &&
input_or_output_iterator<_Ip> &&
__weakly_equality_comparable_with<_Sp, _Ip>;
template<class, class>
inline constexpr bool disable_sized_sentinel_for = false;
template<class _Sp, class _Ip>
concept sized_sentinel_for =
sentinel_for<_Sp, _Ip> &&
!disable_sized_sentinel_for<remove_cv_t<_Sp>, remove_cv_t<_Ip> > &&
requires(const _Ip& __i, const _Sp& __s) {
{ __s - __i } -> same_as<iter_difference_t<_Ip> >;
{ __i - __s } -> same_as<iter_difference_t<_Ip> >;
};
// [iterator.concept.input]
template<class _Ip>
concept input_iterator =
input_or_output_iterator<_Ip> &&
indirectly_readable<_Ip> &&
requires { typename _ITER_CONCEPT<_Ip>; } &&
derived_from<_ITER_CONCEPT<_Ip>, input_iterator_tag>;
// [iterator.concept.forward]
template<class _Ip>
concept forward_iterator =
input_iterator<_Ip> &&
derived_from<_ITER_CONCEPT<_Ip>, forward_iterator_tag> &&
incrementable<_Ip> &&
sentinel_for<_Ip, _Ip>;
// [iterator.concept.bidir]
template<class _Ip>
concept bidirectional_iterator =
forward_iterator<_Ip> &&
derived_from<_ITER_CONCEPT<_Ip>, bidirectional_iterator_tag> &&
requires(_Ip __i) {
{ --__i } -> same_as<_Ip&>;
{ __i-- } -> same_as<_Ip>;
};
template<class _Ip>
concept random_access_iterator =
bidirectional_iterator<_Ip> &&
derived_from<_ITER_CONCEPT<_Ip>, random_access_iterator_tag> &&
totally_ordered<_Ip> &&
sized_sentinel_for<_Ip, _Ip> &&
requires(_Ip __i, const _Ip __j, const iter_difference_t<_Ip> __n) {
{ __i += __n } -> same_as<_Ip&>;
{ __j + __n } -> same_as<_Ip>;
{ __n + __j } -> same_as<_Ip>;
{ __i -= __n } -> same_as<_Ip&>;
{ __j - __n } -> same_as<_Ip>;
{ __j[__n] } -> same_as<iter_reference_t<_Ip>>;
};
template<class _Ip>
concept contiguous_iterator =
random_access_iterator<_Ip> &&
derived_from<_ITER_CONCEPT<_Ip>, contiguous_iterator_tag> &&
is_lvalue_reference_v<iter_reference_t<_Ip>> &&
same_as<iter_value_t<_Ip>, remove_cvref_t<iter_reference_t<_Ip>>> &&
(is_pointer_v<_Ip> || requires { sizeof(__pointer_traits_element_type<_Ip>); }) &&
requires(const _Ip& __i) {
{ _VSTD::to_address(__i) } -> same_as<add_pointer_t<iter_reference_t<_Ip>>>;
};
// clang-format on
#endif // !defined(_LIBCPP_HAS_NO_RANGES)
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP___ITERATOR_CONCEPTS_H
|