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1 | /**************************************************************************** | - |
2 | ** | - |
3 | ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). | - |
4 | ** Contact: http://www.qt-project.org/legal | - |
5 | ** | - |
6 | ** This file is part of the QtCore module of the Qt Toolkit. | - |
7 | ** | - |
8 | ** $QT_BEGIN_LICENSE:LGPL$ | - |
9 | ** Commercial License Usage | - |
10 | ** Licensees holding valid commercial Qt licenses may use this file in | - |
11 | ** accordance with the commercial license agreement provided with the | - |
12 | ** Software or, alternatively, in accordance with the terms contained in | - |
13 | ** a written agreement between you and Digia. For licensing terms and | - |
14 | ** conditions see http://qt.digia.com/licensing. For further information | - |
15 | ** use the contact form at http://qt.digia.com/contact-us. | - |
16 | ** | - |
17 | ** GNU Lesser General Public License Usage | - |
18 | ** Alternatively, this file may be used under the terms of the GNU Lesser | - |
19 | ** General Public License version 2.1 as published by the Free Software | - |
20 | ** Foundation and appearing in the file LICENSE.LGPL included in the | - |
21 | ** packaging of this file. Please review the following information to | - |
22 | ** ensure the GNU Lesser General Public License version 2.1 requirements | - |
23 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. | - |
24 | ** | - |
25 | ** In addition, as a special exception, Digia gives you certain additional | - |
26 | ** rights. These rights are described in the Digia Qt LGPL Exception | - |
27 | ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. | - |
28 | ** | - |
29 | ** GNU General Public License Usage | - |
30 | ** Alternatively, this file may be used under the terms of the GNU | - |
31 | ** General Public License version 3.0 as published by the Free Software | - |
32 | ** Foundation and appearing in the file LICENSE.GPL included in the | - |
33 | ** packaging of this file. Please review the following information to | - |
34 | ** ensure the GNU General Public License version 3.0 requirements will be | - |
35 | ** met: http://www.gnu.org/copyleft/gpl.html. | - |
36 | ** | - |
37 | ** | - |
38 | ** $QT_END_LICENSE$ | - |
39 | ** | - |
40 | ****************************************************************************/ | - |
41 | | - |
42 | #include <new> | - |
43 | #include "qlist.h" | - |
44 | #include "qtools_p.h" | - |
45 | | - |
46 | #include <string.h> | - |
47 | #include <stdlib.h> | - |
48 | | - |
49 | QT_BEGIN_NAMESPACE | - |
50 | | - |
51 | /* | - |
52 | QList as an array-list combines the easy-of-use of a random | - |
53 | access interface with fast list operations and the low memory | - |
54 | management overhead of an array. Accessing elements by index, | - |
55 | appending, prepending, and removing elements from both the front | - |
56 | and the back all happen in constant time O(1). Inserting or | - |
57 | removing elements at random index positions \ai happens in linear | - |
58 | time, or more precisly in O(min{i,n-i}) <= O(n/2), with n being | - |
59 | the number of elements in the list. | - |
60 | */ | - |
61 | | - |
62 | const QListData::Data QListData::shared_null = { Q_REFCOUNT_INITIALIZE_STATIC, 0, 0, 0, { 0 } }; | - |
63 | | - |
64 | static int grow(int size) | - |
65 | { | - |
66 | // dear compiler: don't optimize me out. | - |
67 | volatile int x = qAllocMore(size * sizeof(void *), QListData::DataHeaderSize) / sizeof(void *); executed (the execution status of this line is deduced): volatile int x = qAllocMore(size * sizeof(void *), QListData::DataHeaderSize) / sizeof(void *); | - |
68 | return x; executed: return x; Execution Count:1053559 | 1053559 |
69 | } | - |
70 | | - |
71 | /*! | - |
72 | * Detaches the QListData by allocating new memory for a list which will be bigger | - |
73 | * than the copied one and is expected to grow further. | - |
74 | * *idx is the desired insertion point and is clamped to the actual size of the list. | - |
75 | * num is the number of new elements to insert at the insertion point. | - |
76 | * Returns the old (shared) data, it is up to the caller to deref() and free(). | - |
77 | * For the new data node_copy needs to be called. | - |
78 | * | - |
79 | * \internal | - |
80 | */ | - |
81 | QListData::Data *QListData::detach_grow(int *idx, int num) | - |
82 | { | - |
83 | Data *x = d; executed (the execution status of this line is deduced): Data *x = d; | - |
84 | int l = x->end - x->begin; executed (the execution status of this line is deduced): int l = x->end - x->begin; | - |
85 | int nl = l + num; executed (the execution status of this line is deduced): int nl = l + num; | - |
86 | int alloc = grow(nl); executed (the execution status of this line is deduced): int alloc = grow(nl); | - |
87 | Data* t = static_cast<Data *>(::malloc(DataHeaderSize + alloc * sizeof(void *))); executed (the execution status of this line is deduced): Data* t = static_cast<Data *>(::malloc(DataHeaderSize + alloc * sizeof(void *))); | - |
88 | Q_CHECK_PTR(t); never executed: qBadAlloc(); executed: } Execution Count:817133 partially evaluated: !(t) no Evaluation Count:0 | yes Evaluation Count:817134 |
partially evaluated: 0 no Evaluation Count:0 | yes Evaluation Count:817126 |
| 0-817134 |
89 | | - |
90 | t->ref.initializeOwned(); executed (the execution status of this line is deduced): t->ref.initializeOwned(); | - |
91 | t->alloc = alloc; executed (the execution status of this line is deduced): t->alloc = alloc; | - |
92 | // The space reservation algorithm's optimization is biased towards appending: | - |
93 | // Something which looks like an append will put the data at the beginning, | - |
94 | // while something which looks like a prepend will put it in the middle | - |
95 | // instead of at the end. That's based on the assumption that prepending | - |
96 | // is uncommon and even an initial prepend will eventually be followed by | - |
97 | // at least some appends. | - |
98 | int bg; executed (the execution status of this line is deduced): int bg; | - |
99 | if (*idx < 0) { partially evaluated: *idx < 0 no Evaluation Count:0 | yes Evaluation Count:817126 |
| 0-817126 |
100 | *idx = 0; never executed (the execution status of this line is deduced): *idx = 0; | - |
101 | bg = (alloc - nl) >> 1; never executed (the execution status of this line is deduced): bg = (alloc - nl) >> 1; | - |
102 | } else if (*idx > l) { never executed: } evaluated: *idx > l yes Evaluation Count:761434 | yes Evaluation Count:55696 |
| 0-761434 |
103 | *idx = l; executed (the execution status of this line is deduced): *idx = l; | - |
104 | bg = 0; executed (the execution status of this line is deduced): bg = 0; | - |
105 | } else if (*idx < (l >> 1)) { executed: } Execution Count:761433 evaluated: *idx < (l >> 1) yes Evaluation Count:106 | yes Evaluation Count:55590 |
| 106-761433 |
106 | bg = (alloc - nl) >> 1; executed (the execution status of this line is deduced): bg = (alloc - nl) >> 1; | - |
107 | } else { executed: } Execution Count:106 | 106 |
108 | bg = 0; executed (the execution status of this line is deduced): bg = 0; | - |
109 | } executed: } Execution Count:55590 | 55590 |
110 | t->begin = bg; executed (the execution status of this line is deduced): t->begin = bg; | - |
111 | t->end = bg + nl; executed (the execution status of this line is deduced): t->end = bg + nl; | - |
112 | d = t; executed (the execution status of this line is deduced): d = t; | - |
113 | | - |
114 | return x; executed: return x; Execution Count:817126 | 817126 |
115 | } | - |
116 | | - |
117 | /*! | - |
118 | * Detaches the QListData by allocating new memory for a list which possibly | - |
119 | * has a different size than the copied one. | - |
120 | * Returns the old (shared) data, it is up to the caller to deref() and free() | - |
121 | * For the new data node_copy needs to be called. | - |
122 | * | - |
123 | * \internal | - |
124 | */ | - |
125 | QListData::Data *QListData::detach(int alloc) | - |
126 | { | - |
127 | Data *x = d; executed (the execution status of this line is deduced): Data *x = d; | - |
128 | Data* t = static_cast<Data *>(::malloc(DataHeaderSize + alloc * sizeof(void *))); executed (the execution status of this line is deduced): Data* t = static_cast<Data *>(::malloc(DataHeaderSize + alloc * sizeof(void *))); | - |
129 | Q_CHECK_PTR(t); never executed: qBadAlloc(); executed: } Execution Count:83251 partially evaluated: !(t) no Evaluation Count:0 | yes Evaluation Count:83251 |
partially evaluated: 0 no Evaluation Count:0 | yes Evaluation Count:83251 |
| 0-83251 |
130 | | - |
131 | t->ref.initializeOwned(); executed (the execution status of this line is deduced): t->ref.initializeOwned(); | - |
132 | t->alloc = alloc; executed (the execution status of this line is deduced): t->alloc = alloc; | - |
133 | if (!alloc) { evaluated: !alloc yes Evaluation Count:17658 | yes Evaluation Count:65593 |
| 17658-65593 |
134 | t->begin = 0; executed (the execution status of this line is deduced): t->begin = 0; | - |
135 | t->end = 0; executed (the execution status of this line is deduced): t->end = 0; | - |
136 | } else { executed: } Execution Count:17658 | 17658 |
137 | t->begin = x->begin; executed (the execution status of this line is deduced): t->begin = x->begin; | - |
138 | t->end = x->end; executed (the execution status of this line is deduced): t->end = x->end; | - |
139 | } executed: } Execution Count:65593 | 65593 |
140 | d = t; executed (the execution status of this line is deduced): d = t; | - |
141 | | - |
142 | return x; executed: return x; Execution Count:83251 | 83251 |
143 | } | - |
144 | | - |
145 | void QListData::realloc(int alloc) | - |
146 | { | - |
147 | Q_ASSERT(!d->ref.isShared()); executed (the execution status of this line is deduced): qt_noop(); | - |
148 | Data *x = static_cast<Data *>(::realloc(d, DataHeaderSize + alloc * sizeof(void *))); executed (the execution status of this line is deduced): Data *x = static_cast<Data *>(::realloc(d, DataHeaderSize + alloc * sizeof(void *))); | - |
149 | Q_CHECK_PTR(x); never executed: qBadAlloc(); executed: } Execution Count:236434 partially evaluated: !(x) no Evaluation Count:0 | yes Evaluation Count:236434 |
partially evaluated: 0 no Evaluation Count:0 | yes Evaluation Count:236434 |
| 0-236434 |
150 | | - |
151 | d = x; executed (the execution status of this line is deduced): d = x; | - |
152 | d->alloc = alloc; executed (the execution status of this line is deduced): d->alloc = alloc; | - |
153 | if (!alloc) partially evaluated: !alloc no Evaluation Count:0 | yes Evaluation Count:236434 |
| 0-236434 |
154 | d->begin = d->end = 0; never executed: d->begin = d->end = 0; | 0 |
155 | } executed: } Execution Count:236434 | 236434 |
156 | | - |
157 | void QListData::dispose(Data *d) | - |
158 | { | - |
159 | Q_ASSERT(!d->ref.isShared()); executed (the execution status of this line is deduced): qt_noop(); | - |
160 | free(d); executed (the execution status of this line is deduced): free(d); | - |
161 | } executed: } Execution Count:901061 | 901061 |
162 | | - |
163 | // ensures that enough space is available to append n elements | - |
164 | void **QListData::append(int n) | - |
165 | { | - |
166 | Q_ASSERT(!d->ref.isShared()); executed (the execution status of this line is deduced): qt_noop(); | - |
167 | int e = d->end; executed (the execution status of this line is deduced): int e = d->end; | - |
168 | if (e + n > d->alloc) { evaluated: e + n > d->alloc yes Evaluation Count:282396 | yes Evaluation Count:6671648 |
| 282396-6671648 |
169 | int b = d->begin; executed (the execution status of this line is deduced): int b = d->begin; | - |
170 | if (b - n >= 2 * d->alloc / 3) { evaluated: b - n >= 2 * d->alloc / 3 yes Evaluation Count:70983 | yes Evaluation Count:211413 |
| 70983-211413 |
171 | // we have enough space. Just not at the end -> move it. | - |
172 | e -= b; executed (the execution status of this line is deduced): e -= b; | - |
173 | ::memcpy(d->array, d->array + b, e * sizeof(void *)); executed (the execution status of this line is deduced): ::memcpy(d->array, d->array + b, e * sizeof(void *)); | - |
174 | d->begin = 0; executed (the execution status of this line is deduced): d->begin = 0; | - |
175 | } else { executed: } Execution Count:70982 | 70982 |
176 | realloc(grow(d->alloc + n)); executed (the execution status of this line is deduced): realloc(grow(d->alloc + n)); | - |
177 | } executed: } Execution Count:211414 | 211414 |
178 | } | - |
179 | d->end = e + n; executed (the execution status of this line is deduced): d->end = e + n; | - |
180 | return d->array + e; executed: return d->array + e; Execution Count:6954023 | 6954023 |
181 | } | - |
182 | | - |
183 | // ensures that enough space is available to append one element | - |
184 | void **QListData::append() | - |
185 | { | - |
186 | return append(1); executed: return append(1); Execution Count:6950936 | 6950936 |
187 | } | - |
188 | | - |
189 | // ensures that enough space is available to append the list | - |
190 | void **QListData::append(const QListData& l) | - |
191 | { | - |
192 | return append(l.d->end - l.d->begin); executed: return append(l.d->end - l.d->begin); Execution Count:1772 | 1772 |
193 | } | - |
194 | | - |
195 | void **QListData::prepend() | - |
196 | { | - |
197 | Q_ASSERT(!d->ref.isShared()); executed (the execution status of this line is deduced): qt_noop(); | - |
198 | if (d->begin == 0) { evaluated: d->begin == 0 yes Evaluation Count:25372 | yes Evaluation Count:4248307 |
| 25372-4248307 |
199 | if (d->end >= d->alloc / 3) evaluated: d->end >= d->alloc / 3 yes Evaluation Count:24906 | yes Evaluation Count:466 |
| 466-24906 |
200 | realloc(grow(d->alloc + 1)); executed: realloc(grow(d->alloc + 1)); Execution Count:24906 | 24906 |
201 | | - |
202 | if (d->end < d->alloc / 3) evaluated: d->end < d->alloc / 3 yes Evaluation Count:18529 | yes Evaluation Count:6843 |
| 6843-18529 |
203 | d->begin = d->alloc - 2 * d->end; executed: d->begin = d->alloc - 2 * d->end; Execution Count:18529 | 18529 |
204 | else | - |
205 | d->begin = d->alloc - d->end; executed: d->begin = d->alloc - d->end; Execution Count:6843 | 6843 |
206 | | - |
207 | ::memmove(d->array + d->begin, d->array, d->end * sizeof(void *)); executed (the execution status of this line is deduced): ::memmove(d->array + d->begin, d->array, d->end * sizeof(void *)); | - |
208 | d->end += d->begin; executed (the execution status of this line is deduced): d->end += d->begin; | - |
209 | } executed: } Execution Count:25372 | 25372 |
210 | return d->array + --d->begin; executed: return d->array + --d->begin; Execution Count:4273679 | 4273679 |
211 | } | - |
212 | | - |
213 | void **QListData::insert(int i) | - |
214 | { | - |
215 | Q_ASSERT(!d->ref.isShared()); executed (the execution status of this line is deduced): qt_noop(); | - |
216 | if (i <= 0) evaluated: i <= 0 yes Evaluation Count:4223476 | yes Evaluation Count:1894015 |
| 1894015-4223476 |
217 | return prepend(); executed: return prepend(); Execution Count:4223476 | 4223476 |
218 | int size = d->end - d->begin; executed (the execution status of this line is deduced): int size = d->end - d->begin; | - |
219 | if (i >= size) evaluated: i >= size yes Evaluation Count:1844889 | yes Evaluation Count:49126 |
| 49126-1844889 |
220 | return append(); executed: return append(); Execution Count:1844889 | 1844889 |
221 | | - |
222 | bool leftward = false; executed (the execution status of this line is deduced): bool leftward = false; | - |
223 | | - |
224 | if (d->begin == 0) { evaluated: d->begin == 0 yes Evaluation Count:3199 | yes Evaluation Count:45927 |
| 3199-45927 |
225 | if (d->end == d->alloc) { evaluated: d->end == d->alloc yes Evaluation Count:114 | yes Evaluation Count:3085 |
| 114-3085 |
226 | // If the array is full, we expand it and move some items rightward | - |
227 | realloc(grow(d->alloc + 1)); executed (the execution status of this line is deduced): realloc(grow(d->alloc + 1)); | - |
228 | } else { executed: } Execution Count:114 | 114 |
229 | // If there is free space at the end of the array, we move some items rightward | - |
230 | } executed: } Execution Count:3085 | 3085 |
231 | } else { | - |
232 | if (d->end == d->alloc) { evaluated: d->end == d->alloc yes Evaluation Count:17815 | yes Evaluation Count:28112 |
| 17815-28112 |
233 | // If there is free space at the beginning of the array, we move some items leftward | - |
234 | leftward = true; executed (the execution status of this line is deduced): leftward = true; | - |
235 | } else { executed: } Execution Count:17815 | 17815 |
236 | // If there is free space at both ends, we move as few items as possible | - |
237 | leftward = (i < size - i); executed (the execution status of this line is deduced): leftward = (i < size - i); | - |
238 | } executed: } Execution Count:28112 | 28112 |
239 | } | - |
240 | | - |
241 | if (leftward) { evaluated: leftward yes Evaluation Count:19452 | yes Evaluation Count:29674 |
| 19452-29674 |
242 | --d->begin; executed (the execution status of this line is deduced): --d->begin; | - |
243 | ::memmove(d->array + d->begin, d->array + d->begin + 1, i * sizeof(void *)); executed (the execution status of this line is deduced): ::memmove(d->array + d->begin, d->array + d->begin + 1, i * sizeof(void *)); | - |
244 | } else { executed: } Execution Count:19452 | 19452 |
245 | ::memmove(d->array + d->begin + i + 1, d->array + d->begin + i, executed (the execution status of this line is deduced): ::memmove(d->array + d->begin + i + 1, d->array + d->begin + i, | - |
246 | (size - i) * sizeof(void *)); executed (the execution status of this line is deduced): (size - i) * sizeof(void *)); | - |
247 | ++d->end; executed (the execution status of this line is deduced): ++d->end; | - |
248 | } executed: } Execution Count:29674 | 29674 |
249 | return d->array + d->begin + i; executed: return d->array + d->begin + i; Execution Count:49126 | 49126 |
250 | } | - |
251 | | - |
252 | void QListData::remove(int i) | - |
253 | { | - |
254 | Q_ASSERT(!d->ref.isShared()); executed (the execution status of this line is deduced): qt_noop(); | - |
255 | i += d->begin; executed (the execution status of this line is deduced): i += d->begin; | - |
256 | if (i - d->begin < d->end - i) { evaluated: i - d->begin < d->end - i yes Evaluation Count:6749003 | yes Evaluation Count:670433 |
| 670433-6749003 |
257 | if (int offset = i - d->begin) evaluated: int offset = i - d->begin yes Evaluation Count:27254 | yes Evaluation Count:6721749 |
| 27254-6721749 |
258 | ::memmove(d->array + d->begin + 1, d->array + d->begin, offset * sizeof(void *)); executed: ::memmove(d->array + d->begin + 1, d->array + d->begin, offset * sizeof(void *)); Execution Count:27254 | 27254 |
259 | d->begin++; executed (the execution status of this line is deduced): d->begin++; | - |
260 | } else { executed: } Execution Count:6749002 | 6749002 |
261 | if (int offset = d->end - i - 1) evaluated: int offset = d->end - i - 1 yes Evaluation Count:516649 | yes Evaluation Count:153784 |
| 153784-516649 |
262 | ::memmove(d->array + i, d->array + i + 1, offset * sizeof(void *)); executed: ::memmove(d->array + i, d->array + i + 1, offset * sizeof(void *)); Execution Count:516649 | 516649 |
263 | d->end--; executed (the execution status of this line is deduced): d->end--; | - |
264 | } executed: } Execution Count:670433 | 670433 |
265 | } | - |
266 | | - |
267 | void QListData::remove(int i, int n) | - |
268 | { | - |
269 | Q_ASSERT(!d->ref.isShared()); executed (the execution status of this line is deduced): qt_noop(); | - |
270 | i += d->begin; executed (the execution status of this line is deduced): i += d->begin; | - |
271 | int middle = i + n/2; executed (the execution status of this line is deduced): int middle = i + n/2; | - |
272 | if (middle - d->begin < d->end - middle) { evaluated: middle - d->begin < d->end - middle yes Evaluation Count:43 | yes Evaluation Count:109333 |
| 43-109333 |
273 | ::memmove(d->array + d->begin + n, d->array + d->begin, executed (the execution status of this line is deduced): ::memmove(d->array + d->begin + n, d->array + d->begin, | - |
274 | (i - d->begin) * sizeof(void*)); executed (the execution status of this line is deduced): (i - d->begin) * sizeof(void*)); | - |
275 | d->begin += n; executed (the execution status of this line is deduced): d->begin += n; | - |
276 | } else { executed: } Execution Count:43 | 43 |
277 | ::memmove(d->array + i, d->array + i + n, executed (the execution status of this line is deduced): ::memmove(d->array + i, d->array + i + n, | - |
278 | (d->end - i - n) * sizeof(void*)); executed (the execution status of this line is deduced): (d->end - i - n) * sizeof(void*)); | - |
279 | d->end -= n; executed (the execution status of this line is deduced): d->end -= n; | - |
280 | } executed: } Execution Count:109332 | 109332 |
281 | } | - |
282 | | - |
283 | void QListData::move(int from, int to) | - |
284 | { | - |
285 | Q_ASSERT(!d->ref.isShared()); executed (the execution status of this line is deduced): qt_noop(); | - |
286 | if (from == to) evaluated: from == to yes Evaluation Count:4329 | yes Evaluation Count:5950 |
| 4329-5950 |
287 | return; executed: return; Execution Count:4329 | 4329 |
288 | | - |
289 | from += d->begin; executed (the execution status of this line is deduced): from += d->begin; | - |
290 | to += d->begin; executed (the execution status of this line is deduced): to += d->begin; | - |
291 | void *t = d->array[from]; executed (the execution status of this line is deduced): void *t = d->array[from]; | - |
292 | | - |
293 | if (from < to) { evaluated: from < to yes Evaluation Count:4584 | yes Evaluation Count:1366 |
| 1366-4584 |
294 | if (d->end == d->alloc || 3 * (to - from) < 2 * (d->end - d->begin)) { evaluated: d->end == d->alloc yes Evaluation Count:1133 | yes Evaluation Count:3451 |
evaluated: 3 * (to - from) < 2 * (d->end - d->begin) yes Evaluation Count:2640 | yes Evaluation Count:811 |
| 811-3451 |
295 | ::memmove(d->array + from, d->array + from + 1, (to - from) * sizeof(void *)); executed (the execution status of this line is deduced): ::memmove(d->array + from, d->array + from + 1, (to - from) * sizeof(void *)); | - |
296 | } else { executed: } Execution Count:3773 | 3773 |
297 | // optimization | - |
298 | if (int offset = from - d->begin) evaluated: int offset = from - d->begin yes Evaluation Count:474 | yes Evaluation Count:337 |
| 337-474 |
299 | ::memmove(d->array + d->begin + 1, d->array + d->begin, offset * sizeof(void *)); executed: ::memmove(d->array + d->begin + 1, d->array + d->begin, offset * sizeof(void *)); Execution Count:474 | 474 |
300 | if (int offset = d->end - (to + 1)) partially evaluated: int offset = d->end - (to + 1) no Evaluation Count:0 | yes Evaluation Count:811 |
| 0-811 |
301 | ::memmove(d->array + to + 2, d->array + to + 1, offset * sizeof(void *)); never executed: ::memmove(d->array + to + 2, d->array + to + 1, offset * sizeof(void *)); | 0 |
302 | ++d->begin; executed (the execution status of this line is deduced): ++d->begin; | - |
303 | ++d->end; executed (the execution status of this line is deduced): ++d->end; | - |
304 | ++to; executed (the execution status of this line is deduced): ++to; | - |
305 | } executed: } Execution Count:811 | 811 |
306 | } else { | - |
307 | if (d->begin == 0 || 3 * (from - to) < 2 * (d->end - d->begin)) { evaluated: d->begin == 0 yes Evaluation Count:899 | yes Evaluation Count:467 |
evaluated: 3 * (from - to) < 2 * (d->end - d->begin) yes Evaluation Count:35 | yes Evaluation Count:432 |
| 35-899 |
308 | ::memmove(d->array + to + 1, d->array + to, (from - to) * sizeof(void *)); executed (the execution status of this line is deduced): ::memmove(d->array + to + 1, d->array + to, (from - to) * sizeof(void *)); | - |
309 | } else { executed: } Execution Count:934 | 934 |
310 | // optimization | - |
311 | if (int offset = to - d->begin) partially evaluated: int offset = to - d->begin no Evaluation Count:0 | yes Evaluation Count:432 |
| 0-432 |
312 | ::memmove(d->array + d->begin - 1, d->array + d->begin, offset * sizeof(void *)); never executed: ::memmove(d->array + d->begin - 1, d->array + d->begin, offset * sizeof(void *)); | 0 |
313 | if (int offset = d->end - (from + 1)) evaluated: int offset = d->end - (from + 1) yes Evaluation Count:388 | yes Evaluation Count:44 |
| 44-388 |
314 | ::memmove(d->array + from, d->array + from + 1, offset * sizeof(void *)); executed: ::memmove(d->array + from, d->array + from + 1, offset * sizeof(void *)); Execution Count:388 | 388 |
315 | --d->begin; executed (the execution status of this line is deduced): --d->begin; | - |
316 | --d->end; executed (the execution status of this line is deduced): --d->end; | - |
317 | --to; executed (the execution status of this line is deduced): --to; | - |
318 | } executed: } Execution Count:432 | 432 |
319 | } | - |
320 | d->array[to] = t; executed (the execution status of this line is deduced): d->array[to] = t; | - |
321 | } executed: } Execution Count:5950 | 5950 |
322 | | - |
323 | void **QListData::erase(void **xi) | - |
324 | { | - |
325 | Q_ASSERT(!d->ref.isShared()); executed (the execution status of this line is deduced): qt_noop(); | - |
326 | int i = xi - (d->array + d->begin); executed (the execution status of this line is deduced): int i = xi - (d->array + d->begin); | - |
327 | remove(i); executed (the execution status of this line is deduced): remove(i); | - |
328 | return d->array + d->begin + i; executed: return d->array + d->begin + i; Execution Count:7164638 | 7164638 |
329 | } | - |
330 | | - |
331 | /*! \class QList | - |
332 | \inmodule QtCore | - |
333 | \brief The QList class is a template class that provides lists. | - |
334 | | - |
335 | \ingroup tools | - |
336 | \ingroup shared | - |
337 | | - |
338 | \reentrant | - |
339 | | - |
340 | QList\<T\> is one of Qt's generic \l{container classes}. It | - |
341 | stores a list of values and provides fast index-based access as | - |
342 | well as fast insertions and removals. | - |
343 | | - |
344 | QList\<T\>, QLinkedList\<T\>, and QVector\<T\> provide similar | - |
345 | functionality. Here's an overview: | - |
346 | | - |
347 | \list | - |
348 | \li For most purposes, QList is the right class to use. Its | - |
349 | index-based API is more convenient than QLinkedList's | - |
350 | iterator-based API, and it is usually faster than | - |
351 | QVector because of the way it stores its items in | - |
352 | memory. It also expands to less code in your executable. | - |
353 | \li If you need a real linked list, with guarantees of \l{constant | - |
354 | time} insertions in the middle of the list and iterators to | - |
355 | items rather than indexes, use QLinkedList. | - |
356 | \li If you want the items to occupy adjacent memory positions, | - |
357 | use QVector. | - |
358 | \endlist | - |
359 | | - |
360 | | - |
361 | Internally, QList\<T\> is represented as an array of pointers to | - |
362 | items of type T. If T is itself a pointer type or a basic type | - |
363 | that is no larger than a pointer, or if T is one of Qt's \l{shared | - |
364 | classes}, then QList\<T\> stores the items directly in the pointer | - |
365 | array. For lists under a thousand items, this array representation | - |
366 | allows for very fast insertions in the middle, and it allows | - |
367 | index-based access. Furthermore, operations like prepend() and | - |
368 | append() are very fast, because QList preallocates memory at both | - |
369 | ends of its internal array. (See \l{Algorithmic Complexity} for | - |
370 | details.) Note, however, that for unshared list items that are | - |
371 | larger than a pointer, each append or insert of a new item | - |
372 | requires allocating the new item on the heap, and this per item | - |
373 | allocation might make QVector a better choice in cases that do | - |
374 | lots of appending or inserting, since QVector allocates memory for | - |
375 | its items in a single heap allocation. | - |
376 | | - |
377 | Note that the internal array only ever gets bigger over the life | - |
378 | of the list. It never shrinks. The internal array is deallocated | - |
379 | by the destructor and by the assignment operator, when one list | - |
380 | is assigned to another. | - |
381 | | - |
382 | Here's an example of a QList that stores integers and | - |
383 | a QList that stores QDate values: | - |
384 | | - |
385 | \snippet code/src_corelib_tools_qlistdata.cpp 0 | - |
386 | | - |
387 | Qt includes a QStringList class that inherits QList\<QString\> | - |
388 | and adds a few convenience functions, such as QStringList::join() | - |
389 | and QStringList::find(). (QString::split() creates QStringLists | - |
390 | from strings.) | - |
391 | | - |
392 | QList stores a list of items. The default constructor creates an | - |
393 | empty list. To insert items into the list, you can use | - |
394 | operator<<(): | - |
395 | | - |
396 | \snippet code/src_corelib_tools_qlistdata.cpp 1 | - |
397 | | - |
398 | QList provides these basic functions to add, move, and remove | - |
399 | items: insert(), replace(), removeAt(), move(), and swap(). In | - |
400 | addition, it provides the following convenience functions: | - |
401 | append(), prepend(), removeFirst(), and removeLast(). | - |
402 | | - |
403 | QList uses 0-based indexes, just like C++ arrays. To access the | - |
404 | item at a particular index position, you can use operator[](). On | - |
405 | non-const lists, operator[]() returns a reference to the item and | - |
406 | can be used on the left side of an assignment: | - |
407 | | - |
408 | \snippet code/src_corelib_tools_qlistdata.cpp 2 | - |
409 | | - |
410 | Because QList is implemented as an array of pointers, this | - |
411 | operation is very fast (\l{constant time}). For read-only access, | - |
412 | an alternative syntax is to use at(): | - |
413 | | - |
414 | \snippet code/src_corelib_tools_qlistdata.cpp 3 | - |
415 | | - |
416 | at() can be faster than operator[](), because it never causes a | - |
417 | \l{deep copy} to occur. | - |
418 | | - |
419 | A common requirement is to remove an item from a list and do | - |
420 | something with it. For this, QList provides takeAt(), takeFirst(), | - |
421 | and takeLast(). Here's a loop that removes the items from a list | - |
422 | one at a time and calls \c delete on them: | - |
423 | | - |
424 | \snippet code/src_corelib_tools_qlistdata.cpp 4 | - |
425 | | - |
426 | Inserting and removing items at either ends of the list is very | - |
427 | fast (\l{constant time} in most cases), because QList | - |
428 | preallocates extra space on both sides of its internal buffer to | - |
429 | allow for fast growth at both ends of the list. | - |
430 | | - |
431 | If you want to find all occurrences of a particular value in a | - |
432 | list, use indexOf() or lastIndexOf(). The former searches forward | - |
433 | starting from a given index position, the latter searches | - |
434 | backward. Both return the index of a matching item if they find | - |
435 | it; otherwise, they return -1. For example: | - |
436 | | - |
437 | \snippet code/src_corelib_tools_qlistdata.cpp 5 | - |
438 | | - |
439 | If you simply want to check whether a list contains a particular | - |
440 | value, use contains(). If you want to find out how many times a | - |
441 | particular value occurs in the list, use count(). If you want to | - |
442 | replace all occurrences of a particular value with another, use | - |
443 | replace(). | - |
444 | | - |
445 | QList's value type must be an \l{assignable data type}. This | - |
446 | covers most data types that are commonly used, but the compiler | - |
447 | won't let you, for example, store a QWidget as a value; instead, | - |
448 | store a QWidget *. A few functions have additional requirements; | - |
449 | for example, indexOf() and lastIndexOf() expect the value type to | - |
450 | support \c operator==(). These requirements are documented on a | - |
451 | per-function basis. | - |
452 | | - |
453 | Like the other container classes, QList provides \l{Java-style | - |
454 | iterators} (QListIterator and QMutableListIterator) and | - |
455 | \l{STL-style iterators} (QList::const_iterator and | - |
456 | QList::iterator). In practice, these are rarely used, because you | - |
457 | can use indexes into the QList. QList is implemented in such a way | - |
458 | that direct index-based access is just as fast as using iterators. | - |
459 | | - |
460 | QList does \e not support inserting, prepending, appending or | - |
461 | replacing with references to its own values. Doing so will cause | - |
462 | your application to abort with an error message. | - |
463 | | - |
464 | To make QList as efficient as possible, its member functions don't | - |
465 | validate their input before using it. Except for isEmpty(), member | - |
466 | functions always assume the list is \e not empty. Member functions | - |
467 | that take index values as parameters always assume their index | - |
468 | value parameters are in the valid range. This means QList member | - |
469 | functions can fail. If you define QT_NO_DEBUG when you compile, | - |
470 | failures will not be detected. If you \e don't define QT_NO_DEBUG, | - |
471 | failures will be detected using Q_ASSERT() or Q_ASSERT_X() with an | - |
472 | appropriate message. | - |
473 | | - |
474 | To avoid failures when your list can be empty, call isEmpty() | - |
475 | before calling other member functions. If you must pass an index | - |
476 | value that might not be in the valid range, check that it is less | - |
477 | than the value returned by size() but \e not less than 0. | - |
478 | | - |
479 | \sa QListIterator, QMutableListIterator, QLinkedList, QVector | - |
480 | */ | - |
481 | | - |
482 | /*! | - |
483 | \fn QList<T> QList<T>::mid(int pos, int length) const | - |
484 | | - |
485 | Returns a list whose elements are copied from this list, | - |
486 | starting at position \a pos. If \a length is -1 (the default), all | - |
487 | elements from \a pos are copied; otherwise \a length elements (or | - |
488 | all remaining elements if there are less than \a length elements) | - |
489 | are copied. | - |
490 | */ | - |
491 | | - |
492 | /*! \fn QList::QList() | - |
493 | | - |
494 | Constructs an empty list. | - |
495 | */ | - |
496 | | - |
497 | /*! \fn QList::QList(const QList<T> &other) | - |
498 | | - |
499 | Constructs a copy of \a other. | - |
500 | | - |
501 | This operation takes \l{constant time}, because QList is | - |
502 | \l{implicitly shared}. This makes returning a QList from a | - |
503 | function very fast. If a shared instance is modified, it will be | - |
504 | copied (copy-on-write), and that takes \l{linear time}. | - |
505 | | - |
506 | \sa operator=() | - |
507 | */ | - |
508 | | - |
509 | /*! \fn inline QList::QList(std::initializer_list<T> args) | - |
510 | \since 4.8 | - |
511 | | - |
512 | Construct a list from the std::initializer_list specified by \a args. | - |
513 | | - |
514 | This constructor is only enabled if the compiler supports C++0x | - |
515 | */ | - |
516 | | - |
517 | /*! \fn QList::~QList() | - |
518 | | - |
519 | Destroys the list. References to the values in the list and all | - |
520 | iterators of this list become invalid. | - |
521 | */ | - |
522 | | - |
523 | /*! \fn QList<T> &QList::operator=(const QList<T> &other) | - |
524 | | - |
525 | Assigns \a other to this list and returns a reference to this | - |
526 | list. | - |
527 | */ | - |
528 | | - |
529 | /*! \fn void QList::swap(QList<T> &other) | - |
530 | \since 4.8 | - |
531 | | - |
532 | Swaps list \a other with this list. This operation is very | - |
533 | fast and never fails. | - |
534 | */ | - |
535 | | - |
536 | /*! \fn bool QList::operator==(const QList<T> &other) const | - |
537 | | - |
538 | Returns true if \a other is equal to this list; otherwise returns | - |
539 | false. | - |
540 | | - |
541 | Two lists are considered equal if they contain the same values in | - |
542 | the same order. | - |
543 | | - |
544 | This function requires the value type to have an implementation of | - |
545 | \c operator==(). | - |
546 | | - |
547 | \sa operator!=() | - |
548 | */ | - |
549 | | - |
550 | /*! \fn bool QList::operator!=(const QList<T> &other) const | - |
551 | | - |
552 | Returns true if \a other is not equal to this list; otherwise | - |
553 | returns false. | - |
554 | | - |
555 | Two lists are considered equal if they contain the same values in | - |
556 | the same order. | - |
557 | | - |
558 | This function requires the value type to have an implementation of | - |
559 | \c operator==(). | - |
560 | | - |
561 | \sa operator==() | - |
562 | */ | - |
563 | | - |
564 | /*! | - |
565 | \fn int QList::size() const | - |
566 | | - |
567 | Returns the number of items in the list. | - |
568 | | - |
569 | \sa isEmpty(), count() | - |
570 | */ | - |
571 | | - |
572 | /*! \fn void QList::detach() | - |
573 | | - |
574 | \internal | - |
575 | */ | - |
576 | | - |
577 | /*! \fn void QList::detachShared() | - |
578 | | - |
579 | \internal | - |
580 | | - |
581 | like detach(), but does nothing if we're shared_null. | - |
582 | This prevents needless mallocs, and makes QList more exception safe | - |
583 | in case of cleanup work done in destructors on empty lists. | - |
584 | */ | - |
585 | | - |
586 | /*! \fn bool QList::isDetached() const | - |
587 | | - |
588 | \internal | - |
589 | */ | - |
590 | | - |
591 | /*! \fn void QList::setSharable(bool sharable) | - |
592 | | - |
593 | \internal | - |
594 | */ | - |
595 | | - |
596 | /*! \fn bool QList::isSharedWith(const QList<T> &other) const | - |
597 | | - |
598 | \internal | - |
599 | */ | - |
600 | | - |
601 | /*! \fn bool QList::isEmpty() const | - |
602 | | - |
603 | Returns true if the list contains no items; otherwise returns | - |
604 | false. | - |
605 | | - |
606 | \sa size() | - |
607 | */ | - |
608 | | - |
609 | /*! \fn void QList::clear() | - |
610 | | - |
611 | Removes all items from the list. | - |
612 | | - |
613 | \sa removeAll() | - |
614 | */ | - |
615 | | - |
616 | /*! \fn const T &QList::at(int i) const | - |
617 | | - |
618 | Returns the item at index position \a i in the list. \a i must be | - |
619 | a valid index position in the list (i.e., 0 <= \a i < size()). | - |
620 | | - |
621 | This function is very fast (\l{constant time}). | - |
622 | | - |
623 | \sa value(), operator[]() | - |
624 | */ | - |
625 | | - |
626 | /*! \fn T &QList::operator[](int i) | - |
627 | | - |
628 | Returns the item at index position \a i as a modifiable reference. | - |
629 | \a i must be a valid index position in the list (i.e., 0 <= \a i < | - |
630 | size()). | - |
631 | | - |
632 | This function is very fast (\l{constant time}). | - |
633 | | - |
634 | \sa at(), value() | - |
635 | */ | - |
636 | | - |
637 | /*! \fn const T &QList::operator[](int i) const | - |
638 | | - |
639 | \overload | - |
640 | | - |
641 | Same as at(). | - |
642 | */ | - |
643 | | - |
644 | /*! \fn QList::reserve(int alloc) | - |
645 | | - |
646 | Reserve space for \a alloc elements. | - |
647 | | - |
648 | If \a alloc is smaller than the current size of the list, nothing will happen. | - |
649 | | - |
650 | Use this function to avoid repetetive reallocation of QList's internal | - |
651 | data if you can predict how many elements will be appended. | - |
652 | Note that the reservation applies only to the internal pointer array. | - |
653 | | - |
654 | \since 4.7 | - |
655 | */ | - |
656 | | - |
657 | /*! \fn void QList::append(const T &value) | - |
658 | | - |
659 | Inserts \a value at the end of the list. | - |
660 | | - |
661 | Example: | - |
662 | \snippet code/src_corelib_tools_qlistdata.cpp 6 | - |
663 | | - |
664 | This is the same as list.insert(size(), \a value). | - |
665 | | - |
666 | This operation is typically very fast (\l{constant time}), | - |
667 | because QList preallocates extra space on both sides of its | - |
668 | internal buffer to allow for fast growth at both ends of the | - |
669 | list. | - |
670 | | - |
671 | \sa operator<<(), prepend(), insert() | - |
672 | */ | - |
673 | | - |
674 | /*! \fn void QList::append(const QList<T> &value) | - |
675 | | - |
676 | \overload | - |
677 | | - |
678 | \since 4.5 | - |
679 | | - |
680 | Appends the items of the \a value list to this list. | - |
681 | | - |
682 | \sa operator<<(), operator+=() | - |
683 | */ | - |
684 | | - |
685 | /*! \fn void QList::prepend(const T &value) | - |
686 | | - |
687 | Inserts \a value at the beginning of the list. | - |
688 | | - |
689 | Example: | - |
690 | \snippet code/src_corelib_tools_qlistdata.cpp 7 | - |
691 | | - |
692 | This is the same as list.insert(0, \a value). | - |
693 | | - |
694 | This operation is usually very fast (\l{constant time}), because | - |
695 | QList preallocates extra space on both sides of its internal | - |
696 | buffer to allow for fast growth at both ends of the list. | - |
697 | | - |
698 | \sa append(), insert() | - |
699 | */ | - |
700 | | - |
701 | /*! \fn void QList::insert(int i, const T &value) | - |
702 | | - |
703 | Inserts \a value at index position \a i in the list. If \a i | - |
704 | is 0, the value is prepended to the list. If \a i is size(), the | - |
705 | value is appended to the list. | - |
706 | | - |
707 | Example: | - |
708 | \snippet code/src_corelib_tools_qlistdata.cpp 8 | - |
709 | | - |
710 | \sa append(), prepend(), replace(), removeAt() | - |
711 | */ | - |
712 | | - |
713 | /*! \fn QList::iterator QList::insert(iterator before, const T &value) | - |
714 | | - |
715 | \overload | - |
716 | | - |
717 | Inserts \a value in front of the item pointed to by the | - |
718 | iterator \a before. Returns an iterator pointing at the inserted | - |
719 | item. Note that the iterator passed to the function will be | - |
720 | invalid after the call; the returned iterator should be used | - |
721 | instead. | - |
722 | */ | - |
723 | | - |
724 | /*! \fn void QList::replace(int i, const T &value) | - |
725 | | - |
726 | Replaces the item at index position \a i with \a value. \a i must | - |
727 | be a valid index position in the list (i.e., 0 <= \a i < size()). | - |
728 | | - |
729 | \sa operator[](), removeAt() | - |
730 | */ | - |
731 | | - |
732 | /*! | - |
733 | \fn int QList::removeAll(const T &value) | - |
734 | | - |
735 | Removes all occurrences of \a value in the list and returns the | - |
736 | number of entries removed. | - |
737 | | - |
738 | Example: | - |
739 | \snippet code/src_corelib_tools_qlistdata.cpp 9 | - |
740 | | - |
741 | This function requires the value type to have an implementation of | - |
742 | \c operator==(). | - |
743 | | - |
744 | \sa removeOne(), removeAt(), takeAt(), replace() | - |
745 | */ | - |
746 | | - |
747 | /*! | - |
748 | \fn bool QList::removeOne(const T &value) | - |
749 | \since 4.4 | - |
750 | | - |
751 | Removes the first occurrence of \a value in the list and returns | - |
752 | true on success; otherwise returns false. | - |
753 | | - |
754 | Example: | - |
755 | \snippet code/src_corelib_tools_qlistdata.cpp 10 | - |
756 | | - |
757 | This function requires the value type to have an implementation of | - |
758 | \c operator==(). | - |
759 | | - |
760 | \sa removeAll(), removeAt(), takeAt(), replace() | - |
761 | */ | - |
762 | | - |
763 | /*! \fn void QList::removeAt(int i) | - |
764 | | - |
765 | Removes the item at index position \a i. \a i must be a valid | - |
766 | index position in the list (i.e., 0 <= \a i < size()). | - |
767 | | - |
768 | \sa takeAt(), removeFirst(), removeLast(), removeOne() | - |
769 | */ | - |
770 | | - |
771 | /*! \fn T QList::takeAt(int i) | - |
772 | | - |
773 | Removes the item at index position \a i and returns it. \a i must | - |
774 | be a valid index position in the list (i.e., 0 <= \a i < size()). | - |
775 | | - |
776 | If you don't use the return value, removeAt() is more efficient. | - |
777 | | - |
778 | \sa removeAt(), takeFirst(), takeLast() | - |
779 | */ | - |
780 | | - |
781 | /*! \fn T QList::takeFirst() | - |
782 | | - |
783 | Removes the first item in the list and returns it. This is the | - |
784 | same as takeAt(0). This function assumes the list is not empty. To | - |
785 | avoid failure, call isEmpty() before calling this function. | - |
786 | | - |
787 | This operation takes \l{constant time}. | - |
788 | | - |
789 | If you don't use the return value, removeFirst() is more | - |
790 | efficient. | - |
791 | | - |
792 | \sa takeLast(), takeAt(), removeFirst() | - |
793 | */ | - |
794 | | - |
795 | /*! \fn T QList::takeLast() | - |
796 | | - |
797 | Removes the last item in the list and returns it. This is the | - |
798 | same as takeAt(size() - 1). This function assumes the list is | - |
799 | not empty. To avoid failure, call isEmpty() before calling this | - |
800 | function. | - |
801 | | - |
802 | This operation takes \l{constant time}. | - |
803 | | - |
804 | If you don't use the return value, removeLast() is more | - |
805 | efficient. | - |
806 | | - |
807 | \sa takeFirst(), takeAt(), removeLast() | - |
808 | */ | - |
809 | | - |
810 | /*! \fn void QList::move(int from, int to) | - |
811 | | - |
812 | Moves the item at index position \a from to index position \a to. | - |
813 | | - |
814 | Example: | - |
815 | \snippet code/src_corelib_tools_qlistdata.cpp 11 | - |
816 | | - |
817 | This is the same as insert(\a{to}, takeAt(\a{from})).This function | - |
818 | assumes that both \a from and \a to are at least 0 but less than | - |
819 | size(). To avoid failure, test that both \a from and \a to are at | - |
820 | least 0 and less than size(). | - |
821 | | - |
822 | \sa swap(), insert(), takeAt() | - |
823 | */ | - |
824 | | - |
825 | /*! \fn void QList::swap(int i, int j) | - |
826 | | - |
827 | Exchange the item at index position \a i with the item at index | - |
828 | position \a j. This function assumes that both \a i and \a j are | - |
829 | at least 0 but less than size(). To avoid failure, test that both | - |
830 | \a i and \a j are at least 0 and less than size(). | - |
831 | | - |
832 | Example: | - |
833 | \snippet code/src_corelib_tools_qlistdata.cpp 12 | - |
834 | | - |
835 | \sa move() | - |
836 | */ | - |
837 | | - |
838 | /*! \fn int QList::indexOf(const T &value, int from = 0) const | - |
839 | | - |
840 | Returns the index position of the first occurrence of \a value in | - |
841 | the list, searching forward from index position \a from. Returns | - |
842 | -1 if no item matched. | - |
843 | | - |
844 | Example: | - |
845 | \snippet code/src_corelib_tools_qlistdata.cpp 13 | - |
846 | | - |
847 | This function requires the value type to have an implementation of | - |
848 | \c operator==(). | - |
849 | | - |
850 | Note that QList uses 0-based indexes, just like C++ arrays. Negative | - |
851 | indexes are not supported with the exception of the value mentioned | - |
852 | above. | - |
853 | | - |
854 | \sa lastIndexOf(), contains() | - |
855 | */ | - |
856 | | - |
857 | /*! \fn int QList::lastIndexOf(const T &value, int from = -1) const | - |
858 | | - |
859 | Returns the index position of the last occurrence of \a value in | - |
860 | the list, searching backward from index position \a from. If \a | - |
861 | from is -1 (the default), the search starts at the last item. | - |
862 | Returns -1 if no item matched. | - |
863 | | - |
864 | Example: | - |
865 | \snippet code/src_corelib_tools_qlistdata.cpp 14 | - |
866 | | - |
867 | This function requires the value type to have an implementation of | - |
868 | \c operator==(). | - |
869 | | - |
870 | Note that QList uses 0-based indexes, just like C++ arrays. Negative | - |
871 | indexes are not supported with the exception of the value mentioned | - |
872 | above. | - |
873 | | - |
874 | \sa indexOf() | - |
875 | */ | - |
876 | | - |
877 | /*! \fn bool QList::contains(const T &value) const | - |
878 | | - |
879 | Returns true if the list contains an occurrence of \a value; | - |
880 | otherwise returns false. | - |
881 | | - |
882 | This function requires the value type to have an implementation of | - |
883 | \c operator==(). | - |
884 | | - |
885 | \sa indexOf(), count() | - |
886 | */ | - |
887 | | - |
888 | /*! \fn int QList::count(const T &value) const | - |
889 | | - |
890 | Returns the number of occurrences of \a value in the list. | - |
891 | | - |
892 | This function requires the value type to have an implementation of | - |
893 | \c operator==(). | - |
894 | | - |
895 | \sa contains(), indexOf() | - |
896 | */ | - |
897 | | - |
898 | /*! \fn bool QList::startsWith(const T &value) const | - |
899 | \since 4.5 | - |
900 | | - |
901 | Returns true if this list is not empty and its first | - |
902 | item is equal to \a value; otherwise returns false. | - |
903 | | - |
904 | \sa isEmpty(), contains() | - |
905 | */ | - |
906 | | - |
907 | /*! \fn bool QList::endsWith(const T &value) const | - |
908 | \since 4.5 | - |
909 | | - |
910 | Returns true if this list is not empty and its last | - |
911 | item is equal to \a value; otherwise returns false. | - |
912 | | - |
913 | \sa isEmpty(), contains() | - |
914 | */ | - |
915 | | - |
916 | /*! \fn QList::iterator QList::begin() | - |
917 | | - |
918 | Returns an \l{STL-style iterators}{STL-style iterator} pointing to the first item in | - |
919 | the list. | - |
920 | | - |
921 | \sa constBegin(), end() | - |
922 | */ | - |
923 | | - |
924 | /*! \fn QList::const_iterator QList::begin() const | - |
925 | | - |
926 | \overload | - |
927 | */ | - |
928 | | - |
929 | /*! \fn QList::const_iterator QList::cbegin() const | - |
930 | \since 5.0 | - |
931 | | - |
932 | Returns a const \l{STL-style iterators}{STL-style iterator} pointing to the first item | - |
933 | in the list. | - |
934 | | - |
935 | \sa begin(), cend() | - |
936 | */ | - |
937 | | - |
938 | /*! \fn QList::const_iterator QList::constBegin() const | - |
939 | | - |
940 | Returns a const \l{STL-style iterators}{STL-style iterator} pointing to the first item | - |
941 | in the list. | - |
942 | | - |
943 | \sa begin(), constEnd() | - |
944 | */ | - |
945 | | - |
946 | /*! \fn QList::iterator QList::end() | - |
947 | | - |
948 | Returns an \l{STL-style iterators}{STL-style iterator} pointing to the imaginary item | - |
949 | after the last item in the list. | - |
950 | | - |
951 | \sa begin(), constEnd() | - |
952 | */ | - |
953 | | - |
954 | /*! \fn const_iterator QList::end() const | - |
955 | | - |
956 | \overload | - |
957 | */ | - |
958 | | - |
959 | /*! \fn QList::const_iterator QList::cend() const | - |
960 | \since 5.0 | - |
961 | | - |
962 | Returns a const \l{STL-style iterators}{STL-style iterator} pointing to the imaginary | - |
963 | item after the last item in the list. | - |
964 | | - |
965 | \sa cbegin(), end() | - |
966 | */ | - |
967 | | - |
968 | /*! \fn QList::const_iterator QList::constEnd() const | - |
969 | | - |
970 | Returns a const \l{STL-style iterators}{STL-style iterator} pointing to the imaginary | - |
971 | item after the last item in the list. | - |
972 | | - |
973 | \sa constBegin(), end() | - |
974 | */ | - |
975 | | - |
976 | /*! \fn QList::iterator QList::erase(iterator pos) | - |
977 | | - |
978 | Removes the item associated with the iterator \a pos from the | - |
979 | list, and returns an iterator to the next item in the list (which | - |
980 | may be end()). | - |
981 | | - |
982 | \sa insert(), removeAt() | - |
983 | */ | - |
984 | | - |
985 | /*! \fn QList::iterator QList::erase(iterator begin, iterator end) | - |
986 | | - |
987 | \overload | - |
988 | | - |
989 | Removes all the items from \a begin up to (but not including) \a | - |
990 | end. Returns an iterator to the same item that \a end referred to | - |
991 | before the call. | - |
992 | */ | - |
993 | | - |
994 | /*! \typedef QList::Iterator | - |
995 | | - |
996 | Qt-style synonym for QList::iterator. | - |
997 | */ | - |
998 | | - |
999 | /*! \typedef QList::ConstIterator | - |
1000 | | - |
1001 | Qt-style synonym for QList::const_iterator. | - |
1002 | */ | - |
1003 | | - |
1004 | /*! | - |
1005 | \typedef QList::size_type | - |
1006 | | - |
1007 | Typedef for int. Provided for STL compatibility. | - |
1008 | */ | - |
1009 | | - |
1010 | /*! | - |
1011 | \typedef QList::value_type | - |
1012 | | - |
1013 | Typedef for T. Provided for STL compatibility. | - |
1014 | */ | - |
1015 | | - |
1016 | /*! | - |
1017 | \typedef QList::difference_type | - |
1018 | | - |
1019 | Typedef for ptrdiff_t. Provided for STL compatibility. | - |
1020 | */ | - |
1021 | | - |
1022 | /*! | - |
1023 | \typedef QList::pointer | - |
1024 | | - |
1025 | Typedef for T *. Provided for STL compatibility. | - |
1026 | */ | - |
1027 | | - |
1028 | /*! | - |
1029 | \typedef QList::const_pointer | - |
1030 | | - |
1031 | Typedef for const T *. Provided for STL compatibility. | - |
1032 | */ | - |
1033 | | - |
1034 | /*! | - |
1035 | \typedef QList::reference | - |
1036 | | - |
1037 | Typedef for T &. Provided for STL compatibility. | - |
1038 | */ | - |
1039 | | - |
1040 | /*! | - |
1041 | \typedef QList::const_reference | - |
1042 | | - |
1043 | Typedef for const T &. Provided for STL compatibility. | - |
1044 | */ | - |
1045 | | - |
1046 | /*! \fn int QList::count() const | - |
1047 | | - |
1048 | Returns the number of items in the list. This is effectively the | - |
1049 | same as size(). | - |
1050 | */ | - |
1051 | | - |
1052 | /*! \fn int QList::length() const | - |
1053 | \since 4.5 | - |
1054 | | - |
1055 | This function is identical to count(). | - |
1056 | | - |
1057 | \sa count() | - |
1058 | */ | - |
1059 | | - |
1060 | /*! \fn T& QList::first() | - |
1061 | | - |
1062 | Returns a reference to the first item in the list. The list must | - |
1063 | not be empty. If the list can be empty, call isEmpty() before | - |
1064 | calling this function. | - |
1065 | | - |
1066 | \sa last(), isEmpty() | - |
1067 | */ | - |
1068 | | - |
1069 | /*! \fn const T& QList::first() const | - |
1070 | | - |
1071 | \overload | - |
1072 | */ | - |
1073 | | - |
1074 | /*! \fn T& QList::last() | - |
1075 | | - |
1076 | Returns a reference to the last item in the list. The list must | - |
1077 | not be empty. If the list can be empty, call isEmpty() before | - |
1078 | calling this function. | - |
1079 | | - |
1080 | \sa first(), isEmpty() | - |
1081 | */ | - |
1082 | | - |
1083 | /*! \fn const T& QList::last() const | - |
1084 | | - |
1085 | \overload | - |
1086 | */ | - |
1087 | | - |
1088 | /*! \fn void QList::removeFirst() | - |
1089 | | - |
1090 | Removes the first item in the list. Calling this function is | - |
1091 | equivalent to calling removeAt(0). The list must not be empty. If | - |
1092 | the list can be empty, call isEmpty() before calling this | - |
1093 | function. | - |
1094 | | - |
1095 | \sa removeAt(), takeFirst() | - |
1096 | */ | - |
1097 | | - |
1098 | /*! \fn void QList::removeLast() | - |
1099 | | - |
1100 | Removes the last item in the list. Calling this function is | - |
1101 | equivalent to calling removeAt(size() - 1). The list must not be | - |
1102 | empty. If the list can be empty, call isEmpty() before calling | - |
1103 | this function. | - |
1104 | | - |
1105 | \sa removeAt(), takeLast() | - |
1106 | */ | - |
1107 | | - |
1108 | /*! \fn T QList::value(int i) const | - |
1109 | | - |
1110 | Returns the value at index position \a i in the list. | - |
1111 | | - |
1112 | If the index \a i is out of bounds, the function returns a | - |
1113 | \l{default-constructed value}. If you are certain that the index | - |
1114 | is going to be within bounds, you can use at() instead, which is | - |
1115 | slightly faster. | - |
1116 | | - |
1117 | \sa at(), operator[]() | - |
1118 | */ | - |
1119 | | - |
1120 | /*! \fn T QList::value(int i, const T &defaultValue) const | - |
1121 | | - |
1122 | \overload | - |
1123 | | - |
1124 | If the index \a i is out of bounds, the function returns | - |
1125 | \a defaultValue. | - |
1126 | */ | - |
1127 | | - |
1128 | /*! \fn void QList::push_back(const T &value) | - |
1129 | | - |
1130 | This function is provided for STL compatibility. It is equivalent | - |
1131 | to \l{QList::append()}{append(\a value)}. | - |
1132 | */ | - |
1133 | | - |
1134 | /*! \fn void QList::push_front(const T &value) | - |
1135 | | - |
1136 | This function is provided for STL compatibility. It is equivalent | - |
1137 | to \l{QList::prepend()}{prepend(\a value)}. | - |
1138 | */ | - |
1139 | | - |
1140 | /*! \fn T& QList::front() | - |
1141 | | - |
1142 | This function is provided for STL compatibility. It is equivalent | - |
1143 | to first(). The list must not be empty. If the list can be empty, | - |
1144 | call isEmpty() before calling this function. | - |
1145 | */ | - |
1146 | | - |
1147 | /*! \fn const T& QList::front() const | - |
1148 | | - |
1149 | \overload | - |
1150 | */ | - |
1151 | | - |
1152 | /*! \fn T& QList::back() | - |
1153 | | - |
1154 | This function is provided for STL compatibility. It is equivalent | - |
1155 | to last(). The list must not be empty. If the list can be empty, | - |
1156 | call isEmpty() before calling this function. | - |
1157 | */ | - |
1158 | | - |
1159 | /*! \fn const T& QList::back() const | - |
1160 | | - |
1161 | \overload | - |
1162 | */ | - |
1163 | | - |
1164 | /*! \fn void QList::pop_front() | - |
1165 | | - |
1166 | This function is provided for STL compatibility. It is equivalent | - |
1167 | to removeFirst(). The list must not be empty. If the list can be | - |
1168 | empty, call isEmpty() before calling this function. | - |
1169 | */ | - |
1170 | | - |
1171 | /*! \fn void QList::pop_back() | - |
1172 | | - |
1173 | This function is provided for STL compatibility. It is equivalent | - |
1174 | to removeLast(). The list must not be empty. If the list can be | - |
1175 | empty, call isEmpty() before calling this function. | - |
1176 | */ | - |
1177 | | - |
1178 | /*! \fn bool QList::empty() const | - |
1179 | | - |
1180 | This function is provided for STL compatibility. It is equivalent | - |
1181 | to isEmpty() and returns true if the list is empty. | - |
1182 | */ | - |
1183 | | - |
1184 | /*! \fn QList<T> &QList::operator+=(const QList<T> &other) | - |
1185 | | - |
1186 | Appends the items of the \a other list to this list and returns a | - |
1187 | reference to this list. | - |
1188 | | - |
1189 | \sa operator+(), append() | - |
1190 | */ | - |
1191 | | - |
1192 | /*! \fn void QList::operator+=(const T &value) | - |
1193 | | - |
1194 | \overload | - |
1195 | | - |
1196 | Appends \a value to the list. | - |
1197 | | - |
1198 | \sa append(), operator<<() | - |
1199 | */ | - |
1200 | | - |
1201 | /*! \fn QList<T> QList::operator+(const QList<T> &other) const | - |
1202 | | - |
1203 | Returns a list that contains all the items in this list followed | - |
1204 | by all the items in the \a other list. | - |
1205 | | - |
1206 | \sa operator+=() | - |
1207 | */ | - |
1208 | | - |
1209 | /*! \fn QList<T> &QList::operator<<(const QList<T> &other) | - |
1210 | | - |
1211 | Appends the items of the \a other list to this list and returns a | - |
1212 | reference to this list. | - |
1213 | | - |
1214 | \sa operator+=(), append() | - |
1215 | */ | - |
1216 | | - |
1217 | /*! \fn void QList::operator<<(const T &value) | - |
1218 | | - |
1219 | \overload | - |
1220 | | - |
1221 | Appends \a value to the list. | - |
1222 | */ | - |
1223 | | - |
1224 | /*! \class QList::iterator | - |
1225 | \inmodule QtCore | - |
1226 | \brief The QList::iterator class provides an STL-style non-const iterator for QList and QQueue. | - |
1227 | | - |
1228 | QList features both \l{STL-style iterators} and \l{Java-style | - |
1229 | iterators}. The STL-style iterators are more low-level and more | - |
1230 | cumbersome to use; on the other hand, they are slightly faster | - |
1231 | and, for developers who already know STL, have the advantage of | - |
1232 | familiarity. | - |
1233 | | - |
1234 | QList\<T\>::iterator allows you to iterate over a QList\<T\> (or | - |
1235 | QQueue\<T\>) and to modify the list item associated with the | - |
1236 | iterator. If you want to iterate over a const QList, use | - |
1237 | QList::const_iterator instead. It is generally good practice to | - |
1238 | use QList::const_iterator on a non-const QList as well, unless | - |
1239 | you need to change the QList through the iterator. Const | - |
1240 | iterators are slightly faster, and can improve code readability. | - |
1241 | | - |
1242 | The default QList::iterator constructor creates an uninitialized | - |
1243 | iterator. You must initialize it using a QList function like | - |
1244 | QList::begin(), QList::end(), or QList::insert() before you can | - |
1245 | start iterating. Here's a typical loop that prints all the items | - |
1246 | stored in a list: | - |
1247 | | - |
1248 | \snippet code/src_corelib_tools_qlistdata.cpp 15 | - |
1249 | | - |
1250 | Let's see a few examples of things we can do with a | - |
1251 | QList::iterator that we cannot do with a QList::const_iterator. | - |
1252 | Here's an example that increments every value stored in a | - |
1253 | QList\<int\> by 2: | - |
1254 | | - |
1255 | \snippet code/src_corelib_tools_qlistdata.cpp 16 | - |
1256 | | - |
1257 | Most QList functions accept an integer index rather than an | - |
1258 | iterator. For that reason, iterators are rarely useful in | - |
1259 | connection with QList. One place where STL-style iterators do | - |
1260 | make sense is as arguments to \l{generic algorithms}. | - |
1261 | | - |
1262 | For example, here's how to delete all the widgets stored in a | - |
1263 | QList\<QWidget *\>: | - |
1264 | | - |
1265 | \snippet code/src_corelib_tools_qlistdata.cpp 17 | - |
1266 | | - |
1267 | Multiple iterators can be used on the same list. However, be | - |
1268 | aware that any non-const function call performed on the QList | - |
1269 | will render all existing iterators undefined. If you need to keep | - |
1270 | iterators over a long period of time, we recommend that you use | - |
1271 | QLinkedList rather than QList. | - |
1272 | | - |
1273 | \sa QList::const_iterator, QMutableListIterator | - |
1274 | */ | - |
1275 | | - |
1276 | /*! \typedef QList::iterator::iterator_category | - |
1277 | | - |
1278 | A synonym for \e {std::random_access_iterator_tag} indicating | - |
1279 | this iterator is a random access iterator. | - |
1280 | */ | - |
1281 | | - |
1282 | /*! \typedef QList::iterator::difference_type | - |
1283 | | - |
1284 | \internal | - |
1285 | */ | - |
1286 | | - |
1287 | /*! \typedef QList::iterator::value_type | - |
1288 | | - |
1289 | \internal | - |
1290 | */ | - |
1291 | | - |
1292 | /*! \typedef QList::iterator::pointer | - |
1293 | | - |
1294 | \internal | - |
1295 | */ | - |
1296 | | - |
1297 | /*! \typedef QList::iterator::reference | - |
1298 | | - |
1299 | \internal | - |
1300 | */ | - |
1301 | | - |
1302 | /*! \fn QList::iterator::iterator() | - |
1303 | | - |
1304 | Constructs an uninitialized iterator. | - |
1305 | | - |
1306 | Functions like operator*() and operator++() should not be called | - |
1307 | on an uninitialized iterator. Use operator=() to assign a value | - |
1308 | to it before using it. | - |
1309 | | - |
1310 | \sa QList::begin(), QList::end() | - |
1311 | */ | - |
1312 | | - |
1313 | /*! \fn QList::iterator::iterator(Node *node) | - |
1314 | | - |
1315 | \internal | - |
1316 | */ | - |
1317 | | - |
1318 | /*! \fn QList::iterator::iterator(const iterator &other) | - |
1319 | | - |
1320 | Constructs a copy of \a other. | - |
1321 | */ | - |
1322 | | - |
1323 | /*! \fn T &QList::iterator::operator*() const | - |
1324 | | - |
1325 | Returns a modifiable reference to the current item. | - |
1326 | | - |
1327 | You can change the value of an item by using operator*() on the | - |
1328 | left side of an assignment, for example: | - |
1329 | | - |
1330 | \snippet code/src_corelib_tools_qlistdata.cpp 18 | - |
1331 | | - |
1332 | \sa operator->() | - |
1333 | */ | - |
1334 | | - |
1335 | /*! \fn T *QList::iterator::operator->() const | - |
1336 | | - |
1337 | Returns a pointer to the current item. | - |
1338 | | - |
1339 | \sa operator*() | - |
1340 | */ | - |
1341 | | - |
1342 | /*! \fn T &QList::iterator::operator[](int j) const | - |
1343 | | - |
1344 | Returns a modifiable reference to the item at position *this + | - |
1345 | \a{j}. | - |
1346 | | - |
1347 | This function is provided to make QList iterators behave like C++ | - |
1348 | pointers. | - |
1349 | | - |
1350 | \sa operator+() | - |
1351 | */ | - |
1352 | | - |
1353 | /*! | - |
1354 | \fn bool QList::iterator::operator==(const iterator &other) const | - |
1355 | \fn bool QList::iterator::operator==(const const_iterator &other) const | - |
1356 | | - |
1357 | Returns true if \a other points to the same item as this | - |
1358 | iterator; otherwise returns false. | - |
1359 | | - |
1360 | \sa operator!=() | - |
1361 | */ | - |
1362 | | - |
1363 | /*! | - |
1364 | \fn bool QList::iterator::operator!=(const iterator &other) const | - |
1365 | \fn bool QList::iterator::operator!=(const const_iterator &other) const | - |
1366 | | - |
1367 | Returns true if \a other points to a different item than this | - |
1368 | iterator; otherwise returns false. | - |
1369 | | - |
1370 | \sa operator==() | - |
1371 | */ | - |
1372 | | - |
1373 | /*! | - |
1374 | \fn bool QList::iterator::operator<(const iterator& other) const | - |
1375 | \fn bool QList::iterator::operator<(const const_iterator& other) const | - |
1376 | | - |
1377 | Returns true if the item pointed to by this iterator is less than | - |
1378 | the item pointed to by the \a other iterator. | - |
1379 | */ | - |
1380 | | - |
1381 | /*! | - |
1382 | \fn bool QList::iterator::operator<=(const iterator& other) const | - |
1383 | \fn bool QList::iterator::operator<=(const const_iterator& other) const | - |
1384 | | - |
1385 | Returns true if the item pointed to by this iterator is less than | - |
1386 | or equal to the item pointed to by the \a other iterator. | - |
1387 | */ | - |
1388 | | - |
1389 | /*! | - |
1390 | \fn bool QList::iterator::operator>(const iterator& other) const | - |
1391 | \fn bool QList::iterator::operator>(const const_iterator& other) const | - |
1392 | | - |
1393 | Returns true if the item pointed to by this iterator is greater | - |
1394 | than the item pointed to by the \a other iterator. | - |
1395 | */ | - |
1396 | | - |
1397 | /*! | - |
1398 | \fn bool QList::iterator::operator>=(const iterator& other) const | - |
1399 | \fn bool QList::iterator::operator>=(const const_iterator& other) const | - |
1400 | | - |
1401 | Returns true if the item pointed to by this iterator is greater | - |
1402 | than or equal to the item pointed to by the \a other iterator. | - |
1403 | */ | - |
1404 | | - |
1405 | /*! \fn QList::iterator &QList::iterator::operator++() | - |
1406 | | - |
1407 | The prefix ++ operator (\c{++it}) advances the iterator to the | - |
1408 | next item in the list and returns an iterator to the new current | - |
1409 | item. | - |
1410 | | - |
1411 | Calling this function on QList::end() leads to undefined results. | - |
1412 | | - |
1413 | \sa operator--() | - |
1414 | */ | - |
1415 | | - |
1416 | /*! \fn QList::iterator QList::iterator::operator++(int) | - |
1417 | | - |
1418 | \overload | - |
1419 | | - |
1420 | The postfix ++ operator (\c{it++}) advances the iterator to the | - |
1421 | next item in the list and returns an iterator to the previously | - |
1422 | current item. | - |
1423 | */ | - |
1424 | | - |
1425 | /*! \fn QList::iterator &QList::iterator::operator--() | - |
1426 | | - |
1427 | The prefix -- operator (\c{--it}) makes the preceding item | - |
1428 | current and returns an iterator to the new current item. | - |
1429 | | - |
1430 | Calling this function on QList::begin() leads to undefined results. | - |
1431 | | - |
1432 | \sa operator++() | - |
1433 | */ | - |
1434 | | - |
1435 | /*! \fn QList::iterator QList::iterator::operator--(int) | - |
1436 | | - |
1437 | \overload | - |
1438 | | - |
1439 | The postfix -- operator (\c{it--}) makes the preceding item | - |
1440 | current and returns an iterator to the previously current item. | - |
1441 | */ | - |
1442 | | - |
1443 | /*! \fn QList::iterator &QList::iterator::operator+=(int j) | - |
1444 | | - |
1445 | Advances the iterator by \a j items. (If \a j is negative, the | - |
1446 | iterator goes backward.) | - |
1447 | | - |
1448 | \sa operator-=(), operator+() | - |
1449 | */ | - |
1450 | | - |
1451 | /*! \fn QList::iterator &QList::iterator::operator-=(int j) | - |
1452 | | - |
1453 | Makes the iterator go back by \a j items. (If \a j is negative, | - |
1454 | the iterator goes forward.) | - |
1455 | | - |
1456 | \sa operator+=(), operator-() | - |
1457 | */ | - |
1458 | | - |
1459 | /*! \fn QList::iterator QList::iterator::operator+(int j) const | - |
1460 | | - |
1461 | Returns an iterator to the item at \a j positions forward from | - |
1462 | this iterator. (If \a j is negative, the iterator goes backward.) | - |
1463 | | - |
1464 | \sa operator-(), operator+=() | - |
1465 | */ | - |
1466 | | - |
1467 | /*! \fn QList::iterator QList::iterator::operator-(int j) const | - |
1468 | | - |
1469 | Returns an iterator to the item at \a j positions backward from | - |
1470 | this iterator. (If \a j is negative, the iterator goes forward.) | - |
1471 | | - |
1472 | \sa operator+(), operator-=() | - |
1473 | */ | - |
1474 | | - |
1475 | /*! \fn int QList::iterator::operator-(iterator other) const | - |
1476 | | - |
1477 | Returns the number of items between the item pointed to by \a | - |
1478 | other and the item pointed to by this iterator. | - |
1479 | */ | - |
1480 | | - |
1481 | /*! \class QList::const_iterator | - |
1482 | \inmodule QtCore | - |
1483 | \brief The QList::const_iterator class provides an STL-style const iterator for QList and QQueue. | - |
1484 | | - |
1485 | QList provides both \l{STL-style iterators} and \l{Java-style | - |
1486 | iterators}. The STL-style iterators are more low-level and more | - |
1487 | cumbersome to use; on the other hand, they are slightly faster | - |
1488 | and, for developers who already know STL, have the advantage of | - |
1489 | familiarity. | - |
1490 | | - |
1491 | QList\<T\>::const_iterator allows you to iterate over a | - |
1492 | QList\<T\> (or a QQueue\<T\>). If you want to modify the QList as | - |
1493 | you iterate over it, use QList::iterator instead. It is generally | - |
1494 | good practice to use QList::const_iterator on a non-const QList | - |
1495 | as well, unless you need to change the QList through the | - |
1496 | iterator. Const iterators are slightly faster, and can improve | - |
1497 | code readability. | - |
1498 | | - |
1499 | The default QList::const_iterator constructor creates an | - |
1500 | uninitialized iterator. You must initialize it using a QList | - |
1501 | function like QList::constBegin(), QList::constEnd(), or | - |
1502 | QList::insert() before you can start iterating. Here's a typical | - |
1503 | loop that prints all the items stored in a list: | - |
1504 | | - |
1505 | \snippet code/src_corelib_tools_qlistdata.cpp 19 | - |
1506 | | - |
1507 | Most QList functions accept an integer index rather than an | - |
1508 | iterator. For that reason, iterators are rarely useful in | - |
1509 | connection with QList. One place where STL-style iterators do | - |
1510 | make sense is as arguments to \l{generic algorithms}. | - |
1511 | | - |
1512 | For example, here's how to delete all the widgets stored in a | - |
1513 | QList\<QWidget *\>: | - |
1514 | | - |
1515 | \snippet code/src_corelib_tools_qlistdata.cpp 20 | - |
1516 | | - |
1517 | Multiple iterators can be used on the same list. However, be | - |
1518 | aware that any non-const function call performed on the QList | - |
1519 | will render all existing iterators undefined. If you need to keep | - |
1520 | iterators over a long period of time, we recommend that you use | - |
1521 | QLinkedList rather than QList. | - |
1522 | | - |
1523 | \sa QList::iterator, QListIterator | - |
1524 | */ | - |
1525 | | - |
1526 | /*! \fn QList::const_iterator::const_iterator() | - |
1527 | | - |
1528 | Constructs an uninitialized iterator. | - |
1529 | | - |
1530 | Functions like operator*() and operator++() should not be called | - |
1531 | on an uninitialized iterator. Use operator=() to assign a value | - |
1532 | to it before using it. | - |
1533 | | - |
1534 | \sa QList::constBegin(), QList::constEnd() | - |
1535 | */ | - |
1536 | | - |
1537 | /*! \typedef QList::const_iterator::iterator_category | - |
1538 | | - |
1539 | A synonym for \e {std::random_access_iterator_tag} indicating | - |
1540 | this iterator is a random access iterator. | - |
1541 | */ | - |
1542 | | - |
1543 | /*! \typedef QList::const_iterator::difference_type | - |
1544 | | - |
1545 | \internal | - |
1546 | */ | - |
1547 | | - |
1548 | /*! \typedef QList::const_iterator::value_type | - |
1549 | | - |
1550 | \internal | - |
1551 | */ | - |
1552 | | - |
1553 | /*! \typedef QList::const_iterator::pointer | - |
1554 | | - |
1555 | \internal | - |
1556 | */ | - |
1557 | | - |
1558 | /*! \typedef QList::const_iterator::reference | - |
1559 | | - |
1560 | \internal | - |
1561 | */ | - |
1562 | | - |
1563 | /*! \fn QList::const_iterator::const_iterator(Node *node) | - |
1564 | | - |
1565 | \internal | - |
1566 | */ | - |
1567 | | - |
1568 | /*! \fn QList::const_iterator::const_iterator(const const_iterator &other) | - |
1569 | | - |
1570 | Constructs a copy of \a other. | - |
1571 | */ | - |
1572 | | - |
1573 | /*! \fn QList::const_iterator::const_iterator(const iterator &other) | - |
1574 | | - |
1575 | Constructs a copy of \a other. | - |
1576 | */ | - |
1577 | | - |
1578 | /*! \fn const T &QList::const_iterator::operator*() const | - |
1579 | | - |
1580 | Returns the current item. | - |
1581 | | - |
1582 | \sa operator->() | - |
1583 | */ | - |
1584 | | - |
1585 | /*! \fn const T *QList::const_iterator::operator->() const | - |
1586 | | - |
1587 | Returns a pointer to the current item. | - |
1588 | | - |
1589 | \sa operator*() | - |
1590 | */ | - |
1591 | | - |
1592 | /*! \fn const T &QList::const_iterator::operator[](int j) const | - |
1593 | | - |
1594 | Returns the item at position *this + \a{j}. | - |
1595 | | - |
1596 | This function is provided to make QList iterators behave like C++ | - |
1597 | pointers. | - |
1598 | | - |
1599 | \sa operator+() | - |
1600 | */ | - |
1601 | | - |
1602 | /*! \fn bool QList::const_iterator::operator==(const const_iterator &other) const | - |
1603 | | - |
1604 | Returns true if \a other points to the same item as this | - |
1605 | iterator; otherwise returns false. | - |
1606 | | - |
1607 | \sa operator!=() | - |
1608 | */ | - |
1609 | | - |
1610 | /*! \fn bool QList::const_iterator::operator!=(const const_iterator &other) const | - |
1611 | | - |
1612 | Returns true if \a other points to a different item than this | - |
1613 | iterator; otherwise returns false. | - |
1614 | | - |
1615 | \sa operator==() | - |
1616 | */ | - |
1617 | | - |
1618 | /*! | - |
1619 | \fn bool QList::const_iterator::operator<(const const_iterator& other) const | - |
1620 | | - |
1621 | Returns true if the item pointed to by this iterator is less than | - |
1622 | the item pointed to by the \a other iterator. | - |
1623 | */ | - |
1624 | | - |
1625 | /*! | - |
1626 | \fn bool QList::const_iterator::operator<=(const const_iterator& other) const | - |
1627 | | - |
1628 | Returns true if the item pointed to by this iterator is less than | - |
1629 | or equal to the item pointed to by the \a other iterator. | - |
1630 | */ | - |
1631 | | - |
1632 | /*! | - |
1633 | \fn bool QList::const_iterator::operator>(const const_iterator& other) const | - |
1634 | | - |
1635 | Returns true if the item pointed to by this iterator is greater | - |
1636 | than the item pointed to by the \a other iterator. | - |
1637 | */ | - |
1638 | | - |
1639 | /*! | - |
1640 | \fn bool QList::const_iterator::operator>=(const const_iterator& other) const | - |
1641 | | - |
1642 | Returns true if the item pointed to by this iterator is greater | - |
1643 | than or equal to the item pointed to by the \a other iterator. | - |
1644 | */ | - |
1645 | | - |
1646 | /*! \fn QList::const_iterator &QList::const_iterator::operator++() | - |
1647 | | - |
1648 | The prefix ++ operator (\c{++it}) advances the iterator to the | - |
1649 | next item in the list and returns an iterator to the new current | - |
1650 | item. | - |
1651 | | - |
1652 | Calling this function on QList::end() leads to undefined results. | - |
1653 | | - |
1654 | \sa operator--() | - |
1655 | */ | - |
1656 | | - |
1657 | /*! \fn QList::const_iterator QList::const_iterator::operator++(int) | - |
1658 | | - |
1659 | \overload | - |
1660 | | - |
1661 | The postfix ++ operator (\c{it++}) advances the iterator to the | - |
1662 | next item in the list and returns an iterator to the previously | - |
1663 | current item. | - |
1664 | */ | - |
1665 | | - |
1666 | /*! \fn QList::const_iterator &QList::const_iterator::operator--() | - |
1667 | | - |
1668 | The prefix -- operator (\c{--it}) makes the preceding item | - |
1669 | current and returns an iterator to the new current item. | - |
1670 | | - |
1671 | Calling this function on QList::begin() leads to undefined results. | - |
1672 | | - |
1673 | \sa operator++() | - |
1674 | */ | - |
1675 | | - |
1676 | /*! \fn QList::const_iterator QList::const_iterator::operator--(int) | - |
1677 | | - |
1678 | \overload | - |
1679 | | - |
1680 | The postfix -- operator (\c{it--}) makes the preceding item | - |
1681 | current and returns an iterator to the previously current item. | - |
1682 | */ | - |
1683 | | - |
1684 | /*! \fn QList::const_iterator &QList::const_iterator::operator+=(int j) | - |
1685 | | - |
1686 | Advances the iterator by \a j items. (If \a j is negative, the | - |
1687 | iterator goes backward.) | - |
1688 | | - |
1689 | \sa operator-=(), operator+() | - |
1690 | */ | - |
1691 | | - |
1692 | /*! \fn QList::const_iterator &QList::const_iterator::operator-=(int j) | - |
1693 | | - |
1694 | Makes the iterator go back by \a j items. (If \a j is negative, | - |
1695 | the iterator goes forward.) | - |
1696 | | - |
1697 | \sa operator+=(), operator-() | - |
1698 | */ | - |
1699 | | - |
1700 | /*! \fn QList::const_iterator QList::const_iterator::operator+(int j) const | - |
1701 | | - |
1702 | Returns an iterator to the item at \a j positions forward from | - |
1703 | this iterator. (If \a j is negative, the iterator goes backward.) | - |
1704 | | - |
1705 | \sa operator-(), operator+=() | - |
1706 | */ | - |
1707 | | - |
1708 | /*! \fn QList::const_iterator QList::const_iterator::operator-(int j) const | - |
1709 | | - |
1710 | Returns an iterator to the item at \a j positions backward from | - |
1711 | this iterator. (If \a j is negative, the iterator goes forward.) | - |
1712 | | - |
1713 | \sa operator+(), operator-=() | - |
1714 | */ | - |
1715 | | - |
1716 | /*! \fn int QList::const_iterator::operator-(const_iterator other) const | - |
1717 | | - |
1718 | Returns the number of items between the item pointed to by \a | - |
1719 | other and the item pointed to by this iterator. | - |
1720 | */ | - |
1721 | | - |
1722 | /*! \fn QDataStream &operator<<(QDataStream &out, const QList<T> &list) | - |
1723 | \relates QList | - |
1724 | | - |
1725 | Writes the list \a list to stream \a out. | - |
1726 | | - |
1727 | This function requires the value type to implement \c | - |
1728 | operator<<(). | - |
1729 | | - |
1730 | \sa{Serializing Qt Data Types}{Format of the QDataStream operators} | - |
1731 | */ | - |
1732 | | - |
1733 | /*! \fn QDataStream &operator>>(QDataStream &in, QList<T> &list) | - |
1734 | \relates QList | - |
1735 | | - |
1736 | Reads a list from stream \a in into \a list. | - |
1737 | | - |
1738 | This function requires the value type to implement \c | - |
1739 | operator>>(). | - |
1740 | | - |
1741 | \sa{Serializing Qt Data Types}{Format of the QDataStream operators} | - |
1742 | */ | - |
1743 | | - |
1744 | /*! \fn QList<T> QList<T>::fromVector(const QVector<T> &vector) | - |
1745 | | - |
1746 | Returns a QList object with the data contained in \a vector. | - |
1747 | | - |
1748 | Example: | - |
1749 | | - |
1750 | \snippet code/src_corelib_tools_qlistdata.cpp 21 | - |
1751 | | - |
1752 | \sa fromSet(), toVector(), QVector::toList() | - |
1753 | */ | - |
1754 | | - |
1755 | /*! \fn QVector<T> QList<T>::toVector() const | - |
1756 | | - |
1757 | Returns a QVector object with the data contained in this QList. | - |
1758 | | - |
1759 | Example: | - |
1760 | | - |
1761 | \snippet code/src_corelib_tools_qlistdata.cpp 22 | - |
1762 | | - |
1763 | \sa toSet(), fromVector(), QVector::fromList() | - |
1764 | */ | - |
1765 | | - |
1766 | /*! \fn QList<T> QList<T>::fromSet(const QSet<T> &set) | - |
1767 | | - |
1768 | Returns a QList object with the data contained in \a set. The | - |
1769 | order of the elements in the QList is undefined. | - |
1770 | | - |
1771 | Example: | - |
1772 | | - |
1773 | \snippet code/src_corelib_tools_qlistdata.cpp 23 | - |
1774 | | - |
1775 | \sa fromVector(), toSet(), QSet::toList() | - |
1776 | */ | - |
1777 | | - |
1778 | /*! \fn QSet<T> QList<T>::toSet() const | - |
1779 | | - |
1780 | Returns a QSet object with the data contained in this QList. | - |
1781 | Since QSet doesn't allow duplicates, the resulting QSet might be | - |
1782 | smaller than the original list was. | - |
1783 | | - |
1784 | Example: | - |
1785 | | - |
1786 | \snippet code/src_corelib_tools_qlistdata.cpp 24 | - |
1787 | | - |
1788 | \sa toVector(), fromSet(), QSet::fromList() | - |
1789 | */ | - |
1790 | | - |
1791 | /*! \fn QList<T> QList<T>::fromStdList(const std::list<T> &list) | - |
1792 | | - |
1793 | Returns a QList object with the data contained in \a list. The | - |
1794 | order of the elements in the QList is the same as in \a list. | - |
1795 | | - |
1796 | Example: | - |
1797 | | - |
1798 | \snippet code/src_corelib_tools_qlistdata.cpp 25 | - |
1799 | | - |
1800 | \sa toStdList(), QVector::fromStdVector() | - |
1801 | */ | - |
1802 | | - |
1803 | /*! \fn std::list<T> QList<T>::toStdList() const | - |
1804 | | - |
1805 | Returns a std::list object with the data contained in this QList. | - |
1806 | Example: | - |
1807 | | - |
1808 | \snippet code/src_corelib_tools_qlistdata.cpp 26 | - |
1809 | | - |
1810 | \sa fromStdList(), QVector::toStdVector() | - |
1811 | */ | - |
1812 | | - |
1813 | QT_END_NAMESPACE | - |
1814 | | - |
| | |