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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
|
// -*- 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 <__utility/forward.h>
#include <concepts>
#include <type_traits>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#if !defined(_LIBCPP_HAS_NO_CONCEPTS)
// [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>>;
template<indirectly_readable _Tp>
using iter_common_reference_t = common_reference_t<iter_reference_t<_Tp>, iter_value_t<_Tp>&>;
// [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 =
// TODO: remove this once the clang bug is fixed (bugs.llvm.org/PR48173).
!same_as<_Ip, bool> && // Currently, clang does not handle bool correctly.
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 } -> __can_reference;
} &&
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.output]
template<class _Ip, class _Tp>
concept output_iterator =
input_or_output_iterator<_Ip> &&
indirectly_writable<_Ip, _Tp> &&
requires (_Ip __it, _Tp&& __t) {
*__it++ = _VSTD::forward<_Tp>(__t); // not required to be equality-preserving
};
// [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>>> &&
requires(const _Ip& __i) {
{ _VSTD::to_address(__i) } -> same_as<add_pointer_t<iter_reference_t<_Ip>>>;
};
template<class _Ip>
concept __has_arrow = input_iterator<_Ip> && (is_pointer_v<_Ip> || requires(_Ip __i) { __i.operator->(); });
// [indirectcallable.indirectinvocable]
template<class _Fp, class _It>
concept indirectly_unary_invocable =
indirectly_readable<_It> &&
copy_constructible<_Fp> &&
invocable<_Fp&, iter_value_t<_It>&> &&
invocable<_Fp&, iter_reference_t<_It>> &&
invocable<_Fp&, iter_common_reference_t<_It>> &&
common_reference_with<
invoke_result_t<_Fp&, iter_value_t<_It>&>,
invoke_result_t<_Fp&, iter_reference_t<_It>>>;
template<class _Fp, class _It>
concept indirectly_regular_unary_invocable =
indirectly_readable<_It> &&
copy_constructible<_Fp> &&
regular_invocable<_Fp&, iter_value_t<_It>&> &&
regular_invocable<_Fp&, iter_reference_t<_It>> &&
regular_invocable<_Fp&, iter_common_reference_t<_It>> &&
common_reference_with<
invoke_result_t<_Fp&, iter_value_t<_It>&>,
invoke_result_t<_Fp&, iter_reference_t<_It>>>;
template<class _Fp, class _It>
concept indirect_unary_predicate =
indirectly_readable<_It> &&
copy_constructible<_Fp> &&
predicate<_Fp&, iter_value_t<_It>&> &&
predicate<_Fp&, iter_reference_t<_It>> &&
predicate<_Fp&, iter_common_reference_t<_It>>;
template<class _Fp, class _It1, class _It2>
concept indirect_binary_predicate =
indirectly_readable<_It1> && indirectly_readable<_It2> &&
copy_constructible<_Fp> &&
predicate<_Fp&, iter_value_t<_It1>&, iter_value_t<_It2>&> &&
predicate<_Fp&, iter_value_t<_It1>&, iter_reference_t<_It2>> &&
predicate<_Fp&, iter_reference_t<_It1>, iter_value_t<_It2>&> &&
predicate<_Fp&, iter_reference_t<_It1>, iter_reference_t<_It2>> &&
predicate<_Fp&, iter_common_reference_t<_It1>, iter_common_reference_t<_It2>>;
template<class _Fp, class _It1, class _It2 = _It1>
concept indirect_equivalence_relation =
indirectly_readable<_It1> && indirectly_readable<_It2> &&
copy_constructible<_Fp> &&
equivalence_relation<_Fp&, iter_value_t<_It1>&, iter_value_t<_It2>&> &&
equivalence_relation<_Fp&, iter_value_t<_It1>&, iter_reference_t<_It2>> &&
equivalence_relation<_Fp&, iter_reference_t<_It1>, iter_value_t<_It2>&> &&
equivalence_relation<_Fp&, iter_reference_t<_It1>, iter_reference_t<_It2>> &&
equivalence_relation<_Fp&, iter_common_reference_t<_It1>, iter_common_reference_t<_It2>>;
template<class _Fp, class _It1, class _It2 = _It1>
concept indirect_strict_weak_order =
indirectly_readable<_It1> && indirectly_readable<_It2> &&
copy_constructible<_Fp> &&
strict_weak_order<_Fp&, iter_value_t<_It1>&, iter_value_t<_It2>&> &&
strict_weak_order<_Fp&, iter_value_t<_It1>&, iter_reference_t<_It2>> &&
strict_weak_order<_Fp&, iter_reference_t<_It1>, iter_value_t<_It2>&> &&
strict_weak_order<_Fp&, iter_reference_t<_It1>, iter_reference_t<_It2>> &&
strict_weak_order<_Fp&, iter_common_reference_t<_It1>, iter_common_reference_t<_It2>>;
template<class _Fp, class... _Its>
requires (indirectly_readable<_Its> && ...) && invocable<_Fp, iter_reference_t<_Its>...>
using indirect_result_t = invoke_result_t<_Fp, iter_reference_t<_Its>...>;
template<class _In, class _Out>
concept indirectly_movable =
indirectly_readable<_In> &&
indirectly_writable<_Out, iter_rvalue_reference_t<_In>>;
template<class _In, class _Out>
concept indirectly_movable_storable =
indirectly_movable<_In, _Out> &&
indirectly_writable<_Out, iter_value_t<_In>> &&
movable<iter_value_t<_In>> &&
constructible_from<iter_value_t<_In>, iter_rvalue_reference_t<_In>> &&
assignable_from<iter_value_t<_In>&, iter_rvalue_reference_t<_In>>;
template<class _In, class _Out>
concept indirectly_copyable =
indirectly_readable<_In> &&
indirectly_writable<_Out, iter_reference_t<_In>>;
template<class _In, class _Out>
concept indirectly_copyable_storable =
indirectly_copyable<_In, _Out> &&
indirectly_writable<_Out, iter_value_t<_In>&> &&
indirectly_writable<_Out, const iter_value_t<_In>&> &&
indirectly_writable<_Out, iter_value_t<_In>&&> &&
indirectly_writable<_Out, const iter_value_t<_In>&&> &&
copyable<iter_value_t<_In>> &&
constructible_from<iter_value_t<_In>, iter_reference_t<_In>> &&
assignable_from<iter_value_t<_In>&, iter_reference_t<_In>>;
// Note: indirectly_swappable is located in iter_swap.h to prevent a dependency cycle
// (both iter_swap and indirectly_swappable require indirectly_readable).
#endif // !defined(_LIBCPP_HAS_NO_CONCEPTS)
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___ITERATOR_CONCEPTS_H
|
