summaryrefslogtreecommitdiffstats
path: root/src/corelib/tools/qlinkedlist.cpp
blob: 1d729a08ccb322f120a8d9c106ced9694b30869a (plain)
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
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qlinkedlist.h"

QT_BEGIN_NAMESPACE

QLinkedListData QLinkedListData::shared_null = {
    &QLinkedListData::shared_null, &QLinkedListData::shared_null,
    Q_BASIC_ATOMIC_INITIALIZER(1), 0, true
};

/*! \class QLinkedList
    \brief The QLinkedList class is a template class that provides linked lists.

    \ingroup tools
    \ingroup shared

    \reentrant

    QLinkedList\<T\> is one of Qt's generic \l{container classes}. It
    stores a list of values and provides iterator-based access as
    well as \l{constant time} insertions and removals.

    QList\<T\>, QLinkedList\<T\>, and QVector\<T\> provide similar
    functionality. Here's an overview:

    \list
    \i For most purposes, QList is the right class to use. Its
       index-based API is more convenient than QLinkedList's
       iterator-based API, and it is usually faster than
       QVector because of the way it stores its items in
       memory (see \l{Algorithmic Complexity} for details).
       It also expands to less code in your executable.
    \i If you need a real linked list, with guarantees of \l{constant
       time} insertions in the middle of the list and iterators to
       items rather than indexes, use QLinkedList.
    \i If you want the items to occupy adjacent memory positions,
       use QVector.
    \endlist

    Here's an example of a QLinkedList that stores integers and a
    QLinkedList that stores QTime values:

    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 0

    QLinkedList stores a list of items. The default constructor
    creates an empty list. To insert items into the list, you can use
    operator<<():

    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 1

    If you want to get the first or last item in a linked list, use
    first() or last(). If you want to remove an item from either end
    of the list, use removeFirst() or removeLast(). If you want to
    remove all occurrences of a given value in the list, use
    removeAll().

    A common requirement is to remove the first or last item in the
    list and do something with it. For this, QLinkedList provides
    takeFirst() and takeLast(). Here's a loop that removes the items
    from a list one at a time and calls \c delete on them:
    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 2

    QLinkedList's value type must be an \l {assignable data type}. This
    covers most data types that are commonly used, but the compiler
    won't let you, for example, store a QWidget as a value; instead,
    store a QWidget *. A few functions have additional requirements;
    for example, contains() and removeAll() expect the value type to
    support \c operator==().  These requirements are documented on a
    per-function basis.

    If you want to insert, modify, or remove items in the middle of
    the list, you must use an iterator. QLinkedList provides both
    \l{Java-style iterators} (QLinkedListIterator and
    QMutableLinkedListIterator) and \l{STL-style iterators}
    (QLinkedList::const_iterator and QLinkedList::iterator). See the
    documentation for these classes for details.

    \sa QLinkedListIterator, QMutableLinkedListIterator, QList, QVector
*/

/*! \fn QLinkedList::QLinkedList()

    Constructs an empty list.
*/

/*! \fn QLinkedList::QLinkedList(const QLinkedList<T> &other)

    Constructs a copy of \a other.

    This operation occurs in \l{constant time}, because QLinkedList
    is \l{implicitly shared}. This makes returning a QLinkedList from
    a function very fast. If a shared instance is modified, it will
    be copied (copy-on-write), and this takes \l{linear time}.

    \sa operator=()
*/

/*! \fn QLinkedList::~QLinkedList()

    Destroys the list. References to the values in the list, and all
    iterators over this list, become invalid.
*/

/*! \fn QLinkedList<T> &QLinkedList::operator=(const QLinkedList<T> &other)

    Assigns \a other to this list and returns a reference to this
    list.
*/

/*! \fn void QLinkedList::swap(QLinkedList<T> &other)
    \since 4.8

    Swaps list \a other with this list. This operation is very
    fast and never fails.
*/

/*! \fn bool QLinkedList::operator==(const QLinkedList<T> &other) const

    Returns true if \a other is equal to this list; otherwise returns
    false.

    Two lists are considered equal if they contain the same values in
    the same order.

    This function requires the value type to implement \c
    operator==().

    \sa operator!=()
*/

/*! \fn bool QLinkedList::operator!=(const QLinkedList<T> &other) const

    Returns true if \a other is not equal to this list; otherwise
    returns false.

    Two lists are considered equal if they contain the same values in
    the same order.

    This function requires the value type to implement \c
    operator==().

    \sa operator==()
*/

/*! \fn int QLinkedList::size() const

    Returns the number of items in the list.

    \sa isEmpty(), count()
*/

/*! \fn void QLinkedList::detach()

    \internal
*/

/*! \fn bool QLinkedList::isDetached() const

    \internal
*/

/*! \fn void QLinkedList::setSharable(bool sharable)

    \internal
*/

/*! \fn bool QLinkedList::isSharedWith(const QLinkedList<T> &other) const

    \internal
*/

/*! \fn bool QLinkedList::isEmpty() const

    Returns true if the list contains no items; otherwise returns
    false.

    \sa size()
*/

/*! \fn void QLinkedList::clear()

    Removes all the items in the list.

    \sa removeAll()
*/

/*! \fn void QLinkedList::append(const T &value)

    Inserts \a value at the end of the list.

    Example:
    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 3

    This is the same as list.insert(end(), \a value).

    \sa operator<<(), prepend(), insert()
*/

/*! \fn void QLinkedList::prepend(const T &value)

    Inserts \a value at the beginning of the list.

    Example:
    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 4

    This is the same as list.insert(begin(), \a value).

    \sa append(), insert()
*/

/*! \fn int QLinkedList::removeAll(const T &value)

    Removes all occurrences of \a value in the list.

    Example:
    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 5

    This function requires the value type to have an implementation of
    \c operator==().

    \sa insert()
*/

/*!
    \fn bool QLinkedList::removeOne(const T &value)
    \since 4.4

    Removes the first occurrences of \a value in the list. Returns true on
    success; otherwise returns false.

    Example:
    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 6

    This function requires the value type to have an implementation of
    \c operator==().

    \sa insert()
*/

/*! \fn bool QLinkedList::contains(const T &value) const

    Returns true if the list contains an occurrence of \a value;
    otherwise returns false.

    This function requires the value type to have an implementation of
    \c operator==().

    \sa QLinkedListIterator::findNext(), QLinkedListIterator::findPrevious()
*/

/*! \fn int QLinkedList::count(const T &value) const

    Returns the number of occurrences of \a value in the list.

    This function requires the value type to have an implementation of
    \c operator==().

    \sa contains()
*/

/*! \fn bool QLinkedList::startsWith(const T &value) const
    \since 4.5

    Returns true if the list is not empty and its first
    item is equal to \a value; otherwise returns false.

    \sa isEmpty(), first()
*/

/*! \fn bool QLinkedList::endsWith(const T &value) const
    \since 4.5

    Returns true if the list is not empty and its last
    item is equal to \a value; otherwise returns false.

    \sa isEmpty(), last()
*/

/*! \fn QLinkedList::iterator QLinkedList::begin()

    Returns an \l{STL-style iterator} pointing to the first item in
    the list.

    \sa constBegin(), end()
*/

/*! \fn QLinkedList::const_iterator QLinkedList::begin() const

    \overload
*/

/*! \fn QLinkedList::const_iterator QLinkedList::constBegin() const

    Returns a const \l{STL-style iterator} pointing to the first item
    in the list.

    \sa begin(), constEnd()
*/

/*! \fn QLinkedList::iterator QLinkedList::end()

    Returns an \l{STL-style iterator} pointing to the imaginary item
    after the last item in the list.

    \sa begin(), constEnd()
*/

/*! \fn QLinkedList::const_iterator QLinkedList::end() const

    \overload
*/

/*! \fn QLinkedList::const_iterator QLinkedList::constEnd() const

    Returns a const \l{STL-style iterator} pointing to the imaginary
    item after the last item in the list.

    \sa constBegin(), end()
*/

/*! \fn QLinkedList::iterator QLinkedList::insert(iterator before, const T &value)

    Inserts \a value in front of the item pointed to by the iterator
    \a before. Returns an iterator pointing at the inserted item.

    \sa erase()
*/

/*! \fn QLinkedList::iterator QLinkedList::erase(iterator pos)

    Removes the item pointed to by the iterator \a pos from the list,
    and returns an iterator to the next item in the list (which may be
    end()).

    \sa insert()
*/

/*! \fn QLinkedList::iterator QLinkedList::erase(iterator begin, iterator end)

    \overload

    Removes all the items from \a begin up to (but not including) \a
    end.
*/

/*! \typedef QLinkedList::Iterator

    Qt-style synonym for QLinkedList::iterator.
*/

/*! \typedef QLinkedList::ConstIterator

    Qt-style synonym for QLinkedList::const_iterator.
*/

/*!
    \typedef QLinkedList::size_type

    Typedef for int. Provided for STL compatibility.
*/

/*!
    \typedef QLinkedList::value_type

    Typedef for T. Provided for STL compatibility.
*/

/*!
    \typedef QLinkedList::pointer

    Typedef for T *. Provided for STL compatibility.
*/

/*!
    \typedef QLinkedList::const_pointer

    Typedef for const T *. Provided for STL compatibility.
*/

/*!
    \typedef QLinkedList::reference

    Typedef for T &. Provided for STL compatibility.
*/

/*!
    \typedef QLinkedList::const_reference

    Typedef for const T &. Provided for STL compatibility.
*/

/*!
    \typedef QLinkedList::difference_type

    Typedef for ptrdiff_t. Provided for STL compatibility.
*/

/*! \fn int QLinkedList::count() const

    Same as size().
*/

/*! \fn T& QLinkedList::first()

    Returns a reference to the first item in the list. This function
    assumes that the list isn't empty.

    \sa last(), isEmpty()
*/

/*! \fn const T& QLinkedList::first() const

    \overload
*/

/*! \fn T& QLinkedList::last()

    Returns a reference to the last item in the list. This function
    assumes that the list isn't empty.

    \sa first(), isEmpty()
*/

/*! \fn const T& QLinkedList::last() const

    \overload
*/

/*! \fn void QLinkedList::removeFirst()

    Removes the first item in the list.

    This is the same as erase(begin()).

    \sa removeLast(), erase()
*/

/*! \fn void QLinkedList::removeLast()

    Removes the last item in the list.

    \sa removeFirst(), erase()
*/

/*! \fn T QLinkedList::takeFirst()

    Removes the first item in the list and returns it.

    If you don't use the return value, removeFirst() is more
    efficient.

    \sa takeLast(), removeFirst()
*/

/*! \fn T QLinkedList::takeLast()

    Removes the last item in the list and returns it.

    If you don't use the return value, removeLast() is more
    efficient.

    \sa takeFirst(), removeLast()
*/

/*! \fn void QLinkedList::push_back(const T &value)

    This function is provided for STL compatibility. It is equivalent
    to append(\a value).
*/

/*! \fn void QLinkedList::push_front(const T &value)

    This function is provided for STL compatibility. It is equivalent
    to prepend(\a value).
*/

/*! \fn T& QLinkedList::front()

    This function is provided for STL compatibility. It is equivalent
    to first().
*/

/*! \fn const T& QLinkedList::front() const

    \overload
*/

/*! \fn T& QLinkedList::back()

    This function is provided for STL compatibility. It is equivalent
    to last().
*/

/*! \fn const T& QLinkedList::back() const

    \overload
*/

/*! \fn void QLinkedList::pop_front()

    This function is provided for STL compatibility. It is equivalent
    to removeFirst().
*/

/*! \fn void QLinkedList::pop_back()

    This function is provided for STL compatibility. It is equivalent
    to removeLast().
*/

/*! \fn bool QLinkedList::empty() const

    This function is provided for STL compatibility. It is equivalent
    to isEmpty() and returns true if the list is empty.
*/

/*! \fn QLinkedList<T> &QLinkedList::operator+=(const QLinkedList<T> &other)

    Appends the items of the \a other list to this list and returns a
    reference to this list.

    \sa operator+(), append()
*/

/*! \fn void QLinkedList::operator+=(const T &value)

    \overload

    Appends \a value to the list.
*/

/*! \fn QLinkedList<T> QLinkedList::operator+(const QLinkedList<T> &other) const

    Returns a list that contains all the items in this list followed
    by all the items in the \a other list.

    \sa operator+=()
*/

/*! \fn QLinkedList<T> &QLinkedList::operator<<(const QLinkedList<T> &other)

    Appends the items of the \a other list to this list and returns a
    reference to this list.

    \sa operator+=(), append()
*/

/*! \fn QLinkedList<T> &QLinkedList::operator<<(const T &value)

    \overload

    Appends \a value to the list.
*/

/*! \class QLinkedList::iterator
    \brief The QLinkedList::iterator class provides an STL-style non-const iterator for QLinkedList.

    QLinkedList features both \l{STL-style iterators} and
    \l{Java-style iterators}. The STL-style iterators are more
    low-level and more cumbersome to use; on the other hand, they are
    slightly faster and, for developers who already know STL, have
    the advantage of familiarity.

    QLinkedList\<T\>::iterator allows you to iterate over a
    QLinkedList\<T\> and to modify the list item associated with the
    iterator. If you want to iterate over a const QLinkedList, use
    QLinkedList::const_iterator instead. It is generally good
    practice to use QLinkedList::const_iterator on a non-const
    QLinkedList as well, unless you need to change the QLinkedList
    through the iterator. Const iterators are slightly faster, and
    can improve code readability.

    The default QLinkedList::iterator constructor creates an
    uninitialized iterator. You must initialize it using a
    function like QLinkedList::begin(), QLinkedList::end(), or
    QLinkedList::insert() before you can start iterating. Here's a
    typical loop that prints all the items stored in a list:

    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 7

    STL-style iterators can be used as arguments to \l{generic
    algorithms}. For example, here's how to find an item in the list
    using the qFind() algorithm:

    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 8

    Let's see a few examples of things we can do with a
    QLinkedList::iterator that we cannot do with a QLinkedList::const_iterator.
    Here's an example that increments every value stored in a
    QLinkedList\<int\> by 2:

    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 9

    Here's an example that removes all the items that start with an
    underscore character in a QLinkedList\<QString\>:

    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 10

    The call to QLinkedList::erase() removes the item pointed to by
    the iterator from the list, and returns an iterator to the next
    item. Here's another way of removing an item while iterating:

    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 11

    It might be tempting to write code like this:

    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 12

    However, this will potentially crash in \c{++i}, because \c i is
    a dangling iterator after the call to erase().

    Multiple iterators can be used on the same list. If you add items
    to the list, existing iterators will remain valid. If you remove
    items from the list, iterators that point to the removed items
    will become dangling iterators. However, because of how \l{implicit
    sharing} works, you must not take a copy of a container while
    iterators are active on that container.

    \sa QLinkedList::const_iterator, QMutableLinkedListIterator
*/

/*! \fn QLinkedList::iterator::iterator()

    Constructs an uninitialized iterator.

    Functions like operator*() and operator++() should not be called
    on an uninitialized iterator. Use operator=() to assign a value
    to it before using it.

    \sa QLinkedList::begin() QLinkedList::end()
*/

/*! \fn QLinkedList::iterator::iterator(Node *node)

    \internal
*/

/*! \typedef QLinkedList::iterator::iterator_category

    \internal
*/

/*! \typedef QLinkedList::iterator::difference_type

    \internal
*/

/*! \typedef QLinkedList::iterator::value_type

    \internal
*/

/*! \typedef QLinkedList::iterator::pointer

    \internal
*/

/*! \typedef QLinkedList::iterator::reference

    \internal
*/

/*! \fn QLinkedList::iterator::iterator(const iterator &other)

    Constructs a copy of \a other.
*/

/*! \fn QLinkedList::iterator &QLinkedList::iterator::operator=(const iterator &other)

    Assigns \a other to this iterator.
*/

/*! \fn T &QLinkedList::iterator::operator*() const

    Returns a modifiable reference to the current item.

    You can change the value of an item by using operator*() on the
    left side of an assignment, for example:

    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 13

    \sa operator->()
*/

/*! \fn T *QLinkedList::iterator::operator->() const

    Returns a pointer to the current item.

    \sa operator*()
*/

/*!
    \fn bool QLinkedList::iterator::operator==(const iterator &other) const
    \fn bool QLinkedList::iterator::operator==(const const_iterator &other) const

    Returns true if \a other points to the same item as this
    iterator; otherwise returns false.

    \sa operator!=()
*/

/*!
    \fn bool QLinkedList::iterator::operator!=(const iterator &other) const
    \fn bool QLinkedList::iterator::operator!=(const const_iterator &other) const

    Returns true if \a other points to a different item than this
    iterator; otherwise returns false.

    \sa operator==()
*/

/*! \fn QLinkedList::iterator &QLinkedList::iterator::operator++()

    The prefix ++ operator (\c{++it}) advances the iterator to the
    next item in the list and returns an iterator to the new current
    item.

    Calling this function on QLinkedList::end() leads to undefined
    results.

    \sa operator--()
*/

/*! \fn QLinkedList::iterator QLinkedList::iterator::operator++(int)

    \overload

    The postfix ++ operator (\c{it++}) advances the iterator to the
    next item in the list and returns an iterator to the previously
    current item.
*/

/*! \fn QLinkedList::iterator &QLinkedList::iterator::operator--()

    The prefix -- operator (\c{--it}) makes the preceding item
    current and returns an iterator to the new current item.

    Calling this function on QLinkedList::begin() leads to undefined
    results.

    \sa operator++()
*/

/*! \fn QLinkedList::iterator QLinkedList::iterator::operator--(int)

    \overload

    The postfix -- operator (\c{it--}) makes the preceding item
    current and returns an iterator to the previously current item.
*/

/*! \fn QLinkedList::iterator QLinkedList::iterator::operator+(int j) const

    Returns an iterator to the item at \a j positions forward from
    this iterator. (If \a j is negative, the iterator goes backward.)

    This operation can be slow for large \a j values.

    \sa operator-()

*/

/*! \fn QLinkedList::iterator QLinkedList::iterator::operator-(int j) const

    Returns an iterator to the item at \a j positions backward from
    this iterator. (If \a j is negative, the iterator goes forward.)

    This operation can be slow for large \a j values.

    \sa operator+()
*/

/*! \fn QLinkedList::iterator &QLinkedList::iterator::operator+=(int j)

    Advances the iterator by \a j items. (If \a j is negative, the
    iterator goes backward.)

    \sa operator-=(), operator+()
*/

/*! \fn QLinkedList::iterator &QLinkedList::iterator::operator-=(int j)

    Makes the iterator go back by \a j items. (If \a j is negative,
    the iterator goes forward.)

    \sa operator+=(), operator-()
*/

/*! \class QLinkedList::const_iterator
    \brief The QLinkedList::const_iterator class provides an STL-style const iterator for QLinkedList.

    QLinkedList features both \l{STL-style iterators} and
    \l{Java-style iterators}. The STL-style iterators are more
    low-level and more cumbersome to use; on the other hand, they are
    slightly faster and, for developers who already know STL, have
    the advantage of familiarity.

    QLinkedList\<T\>::const_iterator allows you to iterate over a
    QLinkedList\<T\>. If you want modify the QLinkedList as you iterate
    over it, you must use QLinkedList::iterator instead. It is
    generally good practice to use QLinkedList::const_iterator on a
    non-const QLinkedList as well, unless you need to change the
    QLinkedList through the iterator. Const iterators are slightly
    faster, and can improve code readability.

    The default QLinkedList::const_iterator constructor creates an
    uninitialized iterator. You must initialize it using a function
    like QLinkedList::constBegin(), QLinkedList::constEnd(), or
    QLinkedList::insert() before you can start iterating. Here's a
    typical loop that prints all the items stored in a list:

    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 14

    STL-style iterators can be used as arguments to \l{generic
    algorithms}. For example, here's how to find an item in the list
    using the qFind() algorithm:

    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 15

    Multiple iterators can be used on the same list. If you add items
    to the list, existing iterators will remain valid. If you remove
    items from the list, iterators that point to the removed items
    will become dangling iterators.

    \sa QLinkedList::iterator, QLinkedListIterator
*/

/*! \fn QLinkedList::const_iterator::const_iterator()

    Constructs an uninitialized iterator.

    Functions like operator*() and operator++() should not be called
    on an uninitialized iterator. Use operator=() to assign a value
    to it before using it.

    \sa QLinkedList::constBegin() QLinkedList::constEnd()
*/

/*! \fn QLinkedList::const_iterator::const_iterator(Node *node)

    \internal
*/

/*! \typedef QLinkedList::const_iterator::iterator_category

    \internal
*/

/*! \typedef QLinkedList::const_iterator::difference_type

    \internal
*/

/*! \typedef QLinkedList::const_iterator::value_type

    \internal
*/

/*! \typedef QLinkedList::const_iterator::pointer

    \internal
*/

/*! \typedef QLinkedList::const_iterator::reference

    \internal
*/

/*! \fn QLinkedList::const_iterator::const_iterator(const const_iterator &other)

    Constructs a copy of \a other.
*/

/*! \fn QLinkedList::const_iterator::const_iterator(iterator other)

    Constructs a copy of \a other.
*/

/*! \fn QLinkedList::const_iterator &QLinkedList::const_iterator::operator=( \
            const const_iterator &other)

    Assigns \a other to this iterator.
*/

/*! \fn const T &QLinkedList::const_iterator::operator*() const

    Returns a reference to the current item.

    \sa operator->()
*/

/*! \fn const T *QLinkedList::const_iterator::operator->() const

    Returns a pointer to the current item.

    \sa operator*()
*/

/*! \fn bool QLinkedList::const_iterator::operator==(const const_iterator &other) const

    Returns true if \a other points to the same item as this
    iterator; otherwise returns false.

    \sa operator!=()
*/

/*! \fn bool QLinkedList::const_iterator::operator!=(const const_iterator &other) const

    Returns true if \a other points to a different item than this
    iterator; otherwise returns false.

    \sa operator==()
*/

/*! \fn QLinkedList::const_iterator &QLinkedList::const_iterator::operator++()

    The prefix ++ operator (\c{++it}) advances the iterator to the
    next item in the list and returns an iterator to the new current
    item.

    Calling this function on QLinkedList::constEnd() leads to
    undefined results.

    \sa operator--()
*/

/*! \fn QLinkedList::const_iterator QLinkedList::const_iterator::operator++(int)

    \overload

    The postfix ++ operator (\c{it++}) advances the iterator to the
    next item in the list and returns an iterator to the previously
    current item.
*/

/*! \fn QLinkedList::const_iterator &QLinkedList::const_iterator::operator--()

    The prefix -- operator (\c{--it}) makes the preceding item
    current and returns an iterator to the new current item.

    Calling this function on QLinkedList::begin() leads to undefined
    results.

    \sa operator++()
*/

/*! \fn QLinkedList::const_iterator QLinkedList::const_iterator::operator--(int)

    \overload

    The postfix -- operator (\c{it--}) makes the preceding item
    current and returns an iterator to the previously current item.
*/

/*! \fn QLinkedList::const_iterator QLinkedList::const_iterator::operator+(int j) const

    Returns an iterator to the item at \a j positions forward from
    this iterator. (If \a j is negative, the iterator goes backward.)

    This operation can be slow for large \a j values.

    \sa operator-()
*/

/*! \fn QLinkedList::const_iterator QLinkedList::const_iterator::operator-(int j) const

    This function returns an iterator to the item at \a j positions backward from
    this iterator. (If \a j is negative, the iterator goes forward.)

    This operation can be slow for large \a j values.

    \sa operator+()
*/

/*! \fn QLinkedList::const_iterator &QLinkedList::const_iterator::operator+=(int j)

    Advances the iterator by \a j items. (If \a j is negative, the
    iterator goes backward.)

    This operation can be slow for large \a j values.

    \sa operator-=(), operator+()
*/

/*! \fn QLinkedList::const_iterator &QLinkedList::const_iterator::operator-=(int j)

    Makes the iterator go back by \a j items. (If \a j is negative,
    the iterator goes forward.)

    This operation can be slow for large \a j values.

    \sa operator+=(), operator-()
*/

/*! \fn QDataStream &operator<<(QDataStream &out, const QLinkedList<T> &list)
    \relates QLinkedList

    Writes the linked list \a list to stream \a out.

    This function requires the value type to implement \c
    operator<<().

    \sa \link datastreamformat.html Format of the QDataStream operators \endlink
*/

/*! \fn QDataStream &operator>>(QDataStream &in, QLinkedList<T> &list)
    \relates QLinkedList

    Reads a linked list from stream \a in into \a list.

    This function requires the value type to implement \c operator>>().

    \sa \link datastreamformat.html Format of the QDataStream operators \endlink
*/

/*!
    \fn iterator QLinkedList::remove(iterator pos)

    Use erase() instead.
*/

/*!
    \fn int QLinkedList::findIndex(const T& t) const

    If you need indexes then QList or QVector are better choices than
    QLinkedList.

    \oldcode
    int index = list->findIndex(value);
    \newcode
    int index = 0;
    bool found = false;
    for (const_iterator i = list->begin(); i != list->end(); ++i; ++index)
        if (*i == value) {
            found = true;
            break;
        }
    if (!found)
        index = -1;
    \endcode
*/

/*!
    \fn iterator QLinkedList::find(iterator from, const T& t)

    If you need random access to a data structure then QList, QVector,
    QMap, or QHash, are all better choices than QLinkedList.

    \oldcode
    QLinkedList::iterator i = list->find(from, value);
    \newcode
    QLinkedList::iterator i = from;
    while (i != list->end() && *i != value)
        ++i;
    \endcode
*/

/*!
    \fn iterator QLinkedList::find(const T& t)

    If you need random access to a data structure then QList, QVector,
    QMap, or QHash, are all better choices than QLinkedList.

    \oldcode
    QLinkedList::iterator i = list->find(value);
    \newcode
    QLinkedList::iterator i = list->begin();
    while (i != list->end() && *i != value)
        ++i;
    \endcode
*/

/*!
    \fn const_iterator QLinkedList::find(const_iterator from, const T& t) const

    If you need random access to a data structure then QList, QVector,
    QMap, or QHash, are all better choices than QLinkedList.

    \oldcode
    QLinkedList::const_iterator i = list->find(from, value);
    \newcode
    QLinkedList::const_iterator i = from;
    while (i != list->end() && *i != value)
        ++i;
    \endcode
*/

/*!
    \fn const_iterator QLinkedList::find(const T& t) const

    If you need random access to a data structure then QList, QVector,
    QMap, or QHash, are all better choices than QLinkedList.

    \oldcode
    QLinkedList::const_iterator i = list->find(value);
    \newcode
    QLinkedList::const_iterator i = list->begin();
    while (i != list->end() && *i != value)
        ++i;
    \endcode
*/

/*!
    \since 4.1
    \fn QLinkedList<T> QLinkedList<T>::fromStdList(const std::list<T> &list)

    Returns a QLinkedList object with the data contained in \a list.
    The order of the elements in the QLinkedList is the same as in \a
    list.

    Example:

    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 16

    \sa toStdList()
*/

/*!
    \since 4.1
    \fn std::list<T> QLinkedList<T>::toStdList() const

    Returns a std::list object with the data contained in this
    QLinkedList. Example:

    \snippet doc/src/snippets/code/src_corelib_tools_qlinkedlist.cpp 17

    \sa fromStdList()
*/

QT_END_NAMESPACE