summaryrefslogtreecommitdiffstats
path: root/src/corelib/tools/qmap.cpp
blob: 9e13fcc05e507b566a8851015bb6b4629eb05ccb (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
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qmap.h"

#include <stdlib.h>

#ifdef QT_QMAP_DEBUG
# include <qstring.h>
# include <qvector.h>
#endif

QT_BEGIN_NAMESPACE

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

QMapData *QMapData::createData()
{
    return createData(0);
}

QMapData *QMapData::createData(int alignment)
{
    QMapData *d = new QMapData;
    Q_CHECK_PTR(d);
    Node *e = reinterpret_cast<Node *>(d);
    e->backward = e;
    e->forward[0] = e;
    d->ref = 1;
    d->topLevel = 0;
    d->size = 0;
    d->randomBits = 0;
    d->insertInOrder = false;
    d->sharable = true;
    d->strictAlignment = alignment > 8;
    d->reserved = 0;
    return d;
}

void QMapData::continueFreeData(int offset)
{
    Node *e = reinterpret_cast<Node *>(this);
    Node *cur = e->forward[0];
    Node *prev;
    while (cur != e) {
        prev = cur;
        cur = cur->forward[0];
        if (strictAlignment)
            qFreeAligned(reinterpret_cast<char *>(prev) - offset);
        else
            qFree(reinterpret_cast<char *>(prev) - offset);
    }
    delete this;
}

QMapData::Node *QMapData::node_create(Node *update[], int offset)
{
    return node_create(update, offset, 0);
}

/*!
    Creates a new node inside the data structure.

    \a update is an array with pointers to the node after which the new node
    should be inserted. Because of the strange skip list data structure there
    could be several pointers to this node on different levels.
    \a offset is an amount of bytes that needs to reserved just before the
    QMapData::Node structure.

    \a alignment dictates the alignment for the data.

    \internal
    \since 4.6
*/
QMapData::Node *QMapData::node_create(Node *update[], int offset, int alignment)
{
    int level = 0;
    uint mask = (1 << Sparseness) - 1;

    while ((randomBits & mask) == mask && level < LastLevel) {
        ++level;
        mask <<= Sparseness;
    }

    if (level > topLevel) {
        Node *e = reinterpret_cast<Node *>(this);
        level = ++topLevel;
        e->forward[level] = e;
        update[level] = e;
    }

    ++randomBits;
    if (level == 3 && !insertInOrder)
        randomBits = qrand();

    void *concreteNode = strictAlignment ?
                         qMallocAligned(offset + sizeof(Node) + level * sizeof(Node *), alignment) :
                         qMalloc(offset + sizeof(Node) + level * sizeof(Node *));
    Q_CHECK_PTR(concreteNode);

    Node *abstractNode = reinterpret_cast<Node *>(reinterpret_cast<char *>(concreteNode) + offset);

    abstractNode->backward = update[0];
    update[0]->forward[0]->backward = abstractNode;

    for (int i = level; i >= 0; i--) {
        abstractNode->forward[i] = update[i]->forward[i];
        update[i]->forward[i] = abstractNode;
        update[i] = abstractNode;
    }
    ++size;
    return abstractNode;
}

void QMapData::node_delete(Node *update[], int offset, Node *node)
{
    node->forward[0]->backward = node->backward;

    for (int i = 0; i <= topLevel; ++i) {
        if (update[i]->forward[i] != node)
            break;
        update[i]->forward[i] = node->forward[i];
    }
    --size;
    if (strictAlignment)
        qFreeAligned(reinterpret_cast<char *>(node) - offset);
    else
        qFree(reinterpret_cast<char *>(node) - offset);
}

#ifdef QT_QMAP_DEBUG

uint QMapData::adjust_ptr(Node *node)
{
    if (node == reinterpret_cast<Node *>(this)) {
       return (uint)0xDEADBEEF;
    } else {
        return (uint)node;
    }
}

void QMapData::dump()
{
    qDebug("Map data (ref = %d, size = %d, randomBits = %#.8x)", int(ref), size, randomBits);

    QString preOutput;
    QVector<QString> output(topLevel + 1);
    Node *e = reinterpret_cast<Node *>(this);

    QString str;
    str.sprintf("    %.8x", adjust_ptr(reinterpret_cast<Node *>(this)));
    preOutput += str;

    Node *update[LastLevel + 1];
    for (int i = 0; i <= topLevel; ++i) {
        str.sprintf("%d: [%.8x] -", i, adjust_ptr(reinterpret_cast<Node *>(forward[i])));
        output[i] += str;
        update[i] = reinterpret_cast<Node *>(forward[i]);
    }

    Node *node = reinterpret_cast<Node *>(forward[0]);
    while (node != e) {
        int level = 0;
        while (level < topLevel && update[level + 1] == node)
            ++level;

        str.sprintf("       %.8x", adjust_ptr(node));
        preOutput += str;

        for (int i = 0; i <= level; ++i) {
            str.sprintf("-> [%.8x] -", adjust_ptr(node->forward[i]));
            output[i] += str;
            update[i] = node->forward[i];
        }
        for (int j = level + 1; j <= topLevel; ++j)
            output[j] += QLatin1String("---------------");
        node = node->forward[0];
    }

    qDebug("%s", preOutput.ascii());
    for (int i = 0; i <= topLevel; ++i)
        qDebug("%s", output[i].ascii());
}
#endif

/*!
    \class QMap
    \brief The QMap class is a template class that provides a skip-list-based dictionary.

    \ingroup tools
    \ingroup shared

    \reentrant

    QMap\<Key, T\> is one of Qt's generic \l{container classes}. It
    stores (key, value) pairs and provides fast lookup of the
    value associated with a key.

    QMap and QHash provide very similar functionality. The
    differences are:

    \list
    \i QHash provides faster lookups than QMap. (See \l{Algorithmic
       Complexity} for details.)
    \i When iterating over a QHash, the items are arbitrarily ordered.
       With QMap, the items are always sorted by key.
    \i The key type of a QHash must provide operator==() and a global
       qHash(Key) function. The key type of a QMap must provide
       operator<() specifying a total order.
    \endlist

    Here's an example QMap with QString keys and \c int values:
    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 0

    To insert a (key, value) pair into the map, you can use operator[]():

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

    This inserts the following three (key, value) pairs into the
    QMap: ("one", 1), ("three", 3), and ("seven", 7). Another way to
    insert items into the map is to use insert():

    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 2

    To look up a value, use operator[]() or value():

    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 3

    If there is no item with the specified key in the map, these
    functions return a \l{default-constructed value}.

    If you want to check whether the map contains a certain key, use
    contains():

    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 4

    There is also a value() overload that uses its second argument as
    a default value if there is no item with the specified key:

    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 5

    In general, we recommend that you use contains() and value()
    rather than operator[]() for looking up a key in a map. The
    reason is that operator[]() silently inserts an item into the
    map if no item exists with the same key (unless the map is
    const). For example, the following code snippet will create 1000
    items in memory:

    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 6

    To avoid this problem, replace \c map[i] with \c map.value(i)
    in the code above.

    If you want to navigate through all the (key, value) pairs stored
    in a QMap, you can use an iterator. QMap provides both
    \l{Java-style iterators} (QMapIterator and QMutableMapIterator)
    and \l{STL-style iterators} (QMap::const_iterator and
    QMap::iterator). Here's how to iterate over a QMap<QString, int>
    using a Java-style iterator:

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

    Here's the same code, but using an STL-style iterator this time:

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

    The items are traversed in ascending key order.

    Normally, a QMap allows only one value per key. If you call
    insert() with a key that already exists in the QMap, the
    previous value will be erased. For example:

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

    However, you can store multiple values per key by using
    insertMulti() instead of insert() (or using the convenience
    subclass QMultiMap). If you want to retrieve all the values for a
    single key, you can use values(const Key &key), which returns a
    QList<T>:

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

    The items that share the same key are available from most
    recently to least recently inserted. Another approach is to call
    find() to get the STL-style iterator for the first item with a
    key and iterate from there:

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

    If you only need to extract the values from a map (not the keys),
    you can also use \l{foreach}:

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

    Items can be removed from the map in several ways. One way is to
    call remove(); this will remove any item with the given key.
    Another way is to use QMutableMapIterator::remove(). In addition,
    you can clear the entire map using clear().

    QMap's key and value data types must be \l{assignable data
    types}. This covers most data types you are likely to encounter,
    but the compiler won't let you, for example, store a QWidget as a
    value; instead, store a QWidget *. In addition, QMap's key type
    must provide operator<(). QMap uses it to keep its items sorted,
    and assumes that two keys \c x and \c y are equal if neither \c{x
    < y} nor \c{y < x} is true.

    Example:
    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 13

    In the example, we start by comparing the employees' names. If
    they're equal, we compare their dates of birth to break the tie.

    \sa QMapIterator, QMutableMapIterator, QHash, QSet
*/

/*! \fn QMap::QMap()

    Constructs an empty map.

    \sa clear()
*/

/*! \fn QMap::QMap(const QMap<Key, T> &other)

    Constructs a copy of \a other.

    This operation occurs in \l{constant time}, because QMap is
    \l{implicitly shared}. This makes returning a QMap 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 QMap::QMap(const std::map<Key, T> & other)

    Constructs a copy of \a other.

    This function is only available if Qt is configured with STL
    compatibility enabled.

    \sa toStdMap()
*/

/*! \fn std::map<Key, T> QMap::toStdMap() const

    Returns an STL map equivalent to this QMap.

    This function is only available if Qt is configured with STL
    compatibility enabled.
*/

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

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

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

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

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

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

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

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

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

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

    Two maps are considered equal if they contain the same (key,
    value) pairs.

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

    \sa operator!=()
*/

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

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

    Two maps are considered equal if they contain the same (key,
    value) pairs.

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

    \sa operator==()
*/

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

    Returns the number of (key, value) pairs in the map.

    \sa isEmpty(), count()
*/

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

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

    \sa size()
*/

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

    \internal

    Detaches this map from any other maps with which it may share
    data.

    \sa isDetached()
*/

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

    \internal

    Returns true if the map's internal data isn't shared with any
    other map object; otherwise returns false.

    \sa detach()
*/

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

    \internal
*/

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

    \internal
*/

/*! \fn void QMap::setInsertInOrder(bool sharable)

    \internal
*/

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

    Removes all items from the map.

    \sa remove()
*/

/*! \fn int QMap::remove(const Key &key)

    Removes all the items that have the key \a key from the map.
    Returns the number of items removed which is usually 1 but will be
    0 if the key isn't in the map, or \> 1 if insertMulti() has been
    used with the \a key.

    \sa clear(), take(), QMultiMap::remove()
*/

/*! \fn T QMap::take(const Key &key)

    Removes the item with the key \a key from the map and returns
    the value associated with it.

    If the item does not exist in the map, the function simply
    returns a \l{default-constructed value}. If there are multiple
    items for \a key in the map, only the most recently inserted one
    is removed and returned.

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

    \sa remove()
*/

/*! \fn bool QMap::contains(const Key &key) const

    Returns true if the map contains an item with key \a key;
    otherwise returns false.

    \sa count(), QMultiMap::contains()
*/

/*! \fn const T QMap::value(const Key &key) const

    Returns the value associated with the key \a key.

    If the map contains no item with key \a key, the function
    returns a \l{default-constructed value}. If there are multiple
    items for \a key in the map, the value of the most recently
    inserted one is returned.

    \sa key(), values(), contains(), operator[]()
*/

/*! \fn const T QMap::value(const Key &key, const T &defaultValue) const

    \overload

    If the map contains no item with key \a key, the function returns
    \a defaultValue.
*/

/*! \fn T &QMap::operator[](const Key &key)

    Returns the value associated with the key \a key as a modifiable
    reference.

    If the map contains no item with key \a key, the function inserts
    a \l{default-constructed value} into the map with key \a key, and
    returns a reference to it. If the map contains multiple items
    with key \a key, this function returns a reference to the most
    recently inserted value.

    \sa insert(), value()
*/

/*! \fn const T QMap::operator[](const Key &key) const

    \overload

    Same as value().
*/

/*! \fn QList<Key> QMap::uniqueKeys() const
    \since 4.2

    Returns a list containing all the keys in the map in ascending
    order. Keys that occur multiple times in the map (because items
    were inserted with insertMulti(), or unite() was used) occur only
    once in the returned list.

    \sa keys(), values()
*/

/*! \fn QList<Key> QMap::keys() const

    Returns a list containing all the keys in the map in ascending
    order. Keys that occur multiple times in the map (because items
    were inserted with insertMulti(), or unite() was used) also
    occur multiple times in the list.

    To obtain a list of unique keys, where each key from the map only
    occurs once, use uniqueKeys().

    The order is guaranteed to be the same as that used by values().

    \sa uniqueKeys(), values(), key()
*/

/*! \fn QList<Key> QMap::keys(const T &value) const

    \overload

    Returns a list containing all the keys associated with value \a
    value in ascending order.

    This function can be slow (\l{linear time}), because QMap's
    internal data structure is optimized for fast lookup by key, not
    by value.
*/

/*! \fn Key QMap::key(const T &value) const

    Returns the first key with value \a value.

    If the map contains no item with value \a value, the function
    returns a \link {default-constructed value} default-constructed
    key \endlink.

    This function can be slow (\l{linear time}), because QMap's
    internal data structure is optimized for fast lookup by key, not
    by value.

    \sa value(), keys()
*/

/*!
    \fn Key QMap::key(const T &value, const Key &defaultKey) const
    \since 4.3
    \overload

    Returns the first key with value \a value, or \a defaultKey if
    the map contains no item with value \a value.

    This function can be slow (\l{linear time}), because QMap's
    internal data structure is optimized for fast lookup by key, not
    by value.
*/

/*! \fn QList<T> QMap::values() const

    Returns a list containing all the values in the map, in ascending
    order of their keys. If a key is associated with multiple values,
    all of its values will be in the list, and not just the most
    recently inserted one.

    \sa keys(), value()
*/

/*! \fn QList<T> QMap::values(const Key &key) const

    \overload

    Returns a list containing all the values associated with key
    \a key, from the most recently inserted to the least recently
    inserted one.

    \sa count(), insertMulti()
*/

/*! \fn int QMap::count(const Key &key) const

    Returns the number of items associated with key \a key.

    \sa contains(), insertMulti(), QMultiMap::count()
*/

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

    \overload

    Same as size().
*/

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

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

    \sa constBegin(), end()
*/

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

    \overload
*/

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

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

    \sa begin(), constEnd()
*/

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

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

    \sa begin(), constEnd()
*/

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

    \overload
*/

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

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

    \sa constBegin(), end()
*/

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

    Removes the (key, value) pair pointed to by the iterator \a pos
    from the map, and returns an iterator to the next item in the
    map.

    \sa remove()
*/

/*! \fn QMap::iterator QMap::find(const Key &key)

    Returns an iterator pointing to the item with key \a key in the
    map.

    If the map contains no item with key \a key, the function
    returns end().

    If the map contains multiple items with key \a key, this
    function returns an iterator that points to the most recently
    inserted value. The other values are accessible by incrementing
    the iterator. For example, here's some code that iterates over all
    the items with the same key:

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

    \sa constFind(), value(), values(), lowerBound(), upperBound(), QMultiMap::find()
*/

/*! \fn QMap::const_iterator QMap::find(const Key &key) const

    \overload
*/

/*! \fn QMap::iterator QMap::constFind(const Key &key) const
    \since 4.1

    Returns an const iterator pointing to the item with key \a key in the
    map.

    If the map contains no item with key \a key, the function
    returns constEnd().

    \sa find(), QMultiMap::constFind()
*/

/*! \fn QMap::iterator QMap::lowerBound(const Key &key)

    Returns an iterator pointing to the first item with key \a key in
    the map. If the map contains no item with key \a key, the
    function returns an iterator to the nearest item with a greater
    key.

    Example:
    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 15

    If the map contains multiple items with key \a key, this
    function returns an iterator that points to the most recently
    inserted value. The other values are accessible by incrementing
    the iterator. For example, here's some code that iterates over all
    the items with the same key:

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

    \sa qLowerBound(), upperBound(), find()
*/

/*! \fn QMap::const_iterator QMap::lowerBound(const Key &key) const

    \overload
*/

/*! \fn QMap::iterator QMap::upperBound(const Key &key)

    Returns an iterator pointing to the item that immediately follows
    the last item with key \a key in the map. If the map contains no
    item with key \a key, the function returns an iterator to the
    nearest item with a greater key.

    Example:
    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 17

    \sa qUpperBound(), lowerBound(), find()
*/

/*! \fn QMap::const_iterator QMap::upperBound(const Key &key) const

    \overload
*/

/*! \fn QMap::iterator QMap::insert(const Key &key, const T &value)

    Inserts a new item with the key \a key and a value of \a value.

    If there is already an item with the key \a key, that item's value
    is replaced with \a value.

    If there are multiple items with the key \a key, the most
    recently inserted item's value is replaced with \a value.

    \sa insertMulti()
*/

/*! \fn QMap::iterator QMap::insertMulti(const Key &key, const T &value)

    Inserts a new item with the key \a key and a value of \a value.

    If there is already an item with the same key in the map, this
    function will simply create a new one. (This behavior is
    different from insert(), which overwrites the value of an
    existing item.)

    \sa insert(), values()
*/

/*! \fn QMap<Key, T> &QMap::unite(const QMap<Key, T> &other)

    Inserts all the items in the \a other map into this map. If a
    key is common to both maps, the resulting map will contain the
    key multiple times.

    \sa insertMulti()
*/

/*! \typedef QMap::Iterator

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

/*! \typedef QMap::ConstIterator

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

/*! \typedef QMap::difference_type

    Typedef for ptrdiff_t. Provided for STL compatibility.
*/

/*! \typedef QMap::key_type

    Typedef for Key. Provided for STL compatibility.
*/

/*! \typedef QMap::mapped_type

    Typedef for T. Provided for STL compatibility.
*/

/*! \typedef QMap::size_type

    Typedef for int. Provided for STL compatibility.
*/

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

    This function is provided for STL compatibility. It is equivalent
    to isEmpty(), returning true if the map is empty; otherwise
    returning false.
*/

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

    QMap 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.

    QMap\<Key, T\>::iterator allows you to iterate over a QMap (or
    QMultiMap) and to modify the value (but not the key) stored under
    a particular key. If you want to iterate over a const QMap, you
    should use QMap::const_iterator. It is generally good practice to
    use QMap::const_iterator on a non-const QMap as well, unless you
    need to change the QMap through the iterator. Const iterators are
    slightly faster, and can improve code readability.

    The default QMap::iterator constructor creates an uninitialized
    iterator. You must initialize it using a QMap function like
    QMap::begin(), QMap::end(), or QMap::find() before you can
    start iterating. Here's a typical loop that prints all the (key,
    value) pairs stored in a map:

    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 18

    Unlike QHash, which stores its items in an arbitrary order, QMap
    stores its items ordered by key. Items that share the same key
    (because they were inserted using QMap::insertMulti(), or due to a
    unite()) will appear consecutively, from the most recently to the
    least recently inserted value.

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

    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 19

    Here's an example that removes all the items whose key is a
    string that starts with an underscore character:

    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 20

    The call to QMap::erase() removes the item pointed to by the
    iterator from the map, 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_qmap.cpp 21

    It might be tempting to write code like this:

    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 22

    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 map. If you add items
    to the map, existing iterators will remain valid. If you remove
    items from the map, iterators that point to the removed items
    will become dangling iterators.

    \sa QMap::const_iterator, QMutableMapIterator
*/

/*! \fn QMap::iterator::operator QMapData::Node *() const

    \internal
*/

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

    \internal
*/

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

  A synonym for \e {std::bidirectional_iterator_tag} indicating
  this iterator is a bidirectional iterator.
*/

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

    \internal
*/

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

    \internal
*/

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

    \internal
*/

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

    Constructs an uninitialized iterator.

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

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

/*! \fn QMap::iterator::iterator(QMapData::Node *node)

    \internal
*/

/*! \fn const Key &QMap::iterator::key() const

    Returns the current item's key as a const reference.

    There is no direct way of changing an item's key through an
    iterator, although it can be done by calling QMap::erase()
    followed by QMap::insert() or QMap::insertMulti().

    \sa value()
*/

/*! \fn T &QMap::iterator::value() const

    Returns a modifiable reference to the current item's value.

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

    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 23

    \sa key(), operator*()
*/

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

    Returns a modifiable reference to the current item's value.

    Same as value().

    \sa key()
*/

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

    Returns a pointer to the current item's value.

    \sa value()
*/

/*!
    \fn bool QMap::iterator::operator==(const iterator &other) const
    \fn bool QMap::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 QMap::iterator::operator!=(const iterator &other) const
    \fn bool QMap::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 QMap::iterator QMap::iterator::operator++()

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

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

    \sa operator--()
*/

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

    \overload

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

/*! \fn QMap::iterator QMap::iterator::operator--()

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

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

    \sa operator++()
*/

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

    \overload

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

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

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

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

/*! \fn QMap::iterator &QMap::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 QMap::const_iterator
    \brief The QMap::const_iterator class provides an STL-style const iterator for QMap and QMultiMap.

    QMap 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.

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

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

    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 24

    Unlike QHash, which stores its items in an arbitrary order, QMap
    stores its items ordered by key. Items that share the same key
    (because they were inserted using QMap::insertMulti()) will
    appear consecutively, from the most recently to the least
    recently inserted value.

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

    \sa QMap::iterator, QMapIterator
*/

/*! \fn QMap::const_iterator::operator QMapData::Node *() const

    \internal
*/

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

    \internal
*/

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

  A synonym for \e {std::bidirectional_iterator_tag} indicating
  this iterator is a bidirectional iterator.
*/

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

    \internal
*/

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

    \internal
*/

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

    \internal
*/

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

    Constructs an uninitialized iterator.

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

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

/*! \fn QMap::const_iterator::const_iterator(QMapData::Node *node)

    \internal
*/

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

    Constructs a copy of \a other.
*/

/*! \fn const Key &QMap::const_iterator::key() const

    Returns the current item's key.

    \sa value()
*/

/*! \fn const T &QMap::const_iterator::value() const

    Returns the current item's value.

    \sa key(), operator*()
*/

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

    Returns the current item's value.

    Same as value().

    \sa key()
*/

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

    Returns a pointer to the current item's value.

    \sa value()
*/

/*! \fn bool QMap::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 QMap::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 QMap::const_iterator QMap::const_iterator::operator++()

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

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

    \sa operator--()
*/

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

    \overload

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

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

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

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

    \sa operator++()
*/

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

    \overload

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

/*! \fn QMap::const_iterator QMap::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 QMap::const_iterator QMap::const_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 QMap::const_iterator &QMap::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 QMap::const_iterator &QMap::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 QMap<Key, T> &map)
    \relates QMap

    Writes the map \a map to stream \a out.

    This function requires the key and value types to implement \c
    operator<<().

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

/*! \fn QDataStream &operator>>(QDataStream &in, QMap<Key, T> &map)
    \relates QMap

    Reads a map from stream \a in into \a map.

    This function requires the key and value types to implement \c
    operator>>().

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

/*! \class QMultiMap
    \brief The QMultiMap class is a convenience QMap subclass that provides multi-valued maps.

    \ingroup tools
    \ingroup shared

    \reentrant

    QMultiMap\<Key, T\> is one of Qt's generic \l{container classes}.
    It inherits QMap and extends it with a few convenience functions
    that make it more suitable than QMap for storing multi-valued
    maps. A multi-valued map is a map that allows multiple values
    with the same key; QMap normally doesn't allow that, unless you
    call QMap::insertMulti().

    Because QMultiMap inherits QMap, all of QMap's functionality also
    applies to QMultiMap. For example, you can use isEmpty() to test
    whether the map is empty, and you can traverse a QMultiMap using
    QMap's iterator classes (for example, QMapIterator). But in
    addition, it provides an insert() function that corresponds to
    QMap::insertMulti(), and a replace() function that corresponds to
    QMap::insert(). It also provides convenient operator+() and
    operator+=().

    Example:
    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 25

    Unlike QMap, QMultiMap provides no operator[]. Use value() or
    replace() if you want to access the most recently inserted item
    with a certain key.

    If you want to retrieve all the values for a single key, you can
    use values(const Key &key), which returns a QList<T>:

    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 26

    The items that share the same key are available from most
    recently to least recently inserted.

    If you prefer the STL-style iterators, you can call find() to get
    the iterator for the first item with a key and iterate from
    there:

    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 27

    QMultiMap's key and value data types must be \l{assignable data
    types}. This covers most data types you are likely to encounter,
    but the compiler won't let you, for example, store a QWidget as a
    value; instead, store a QWidget *. In addition, QMultiMap's key type
    must provide operator<(). See the QMap documentation for details.

    \sa QMap, QMapIterator, QMutableMapIterator, QMultiHash
*/

/*! \fn QMultiMap::QMultiMap()

    Constructs an empty map.
*/

/*! \fn QMultiMap::QMultiMap(const QMap<Key, T> &other)

    Constructs a copy of \a other (which can be a QMap or a
    QMultiMap).

    \sa operator=()
*/

/*! \fn QMultiMap::iterator QMultiMap::replace(const Key &key, const T &value)

    Inserts a new item with the key \a key and a value of \a value.

    If there is already an item with the key \a key, that item's value
    is replaced with \a value.

    If there are multiple items with the key \a key, the most
    recently inserted item's value is replaced with \a value.

    \sa insert()
*/

/*! \fn QMultiMap::iterator QMultiMap::insert(const Key &key, const T &value)

    Inserts a new item with the key \a key and a value of \a value.

    If there is already an item with the same key in the map, this
    function will simply create a new one. (This behavior is
    different from replace(), which overwrites the value of an
    existing item.)

    \sa replace()
*/

/*! \fn QMultiMap &QMultiMap::operator+=(const QMultiMap &other)

    Inserts all the items in the \a other map into this map and
    returns a reference to this map.

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

/*! \fn QMultiMap QMultiMap::operator+(const QMultiMap &other) const

    Returns a map that contains all the items in this map in
    addition to all the items in \a other. If a key is common to both
    maps, the resulting map will contain the key multiple times.

    \sa operator+=()
*/

/*!
    \fn bool QMultiMap::contains(const Key &key, const T &value) const
    \since 4.3

    Returns true if the map contains an item with key \a key and
    value \a value; otherwise returns false.

    \sa QMap::contains()
*/

/*!
    \fn bool QMultiMap::contains(const Key &key) const
    \overload
    \sa QMap::contains()
*/

/*!
    \fn int QMultiMap::remove(const Key &key, const T &value)
    \since 4.3

    Removes all the items that have the key \a key and the value \a
    value from the map. Returns the number of items removed.

    \sa QMap::remove()
*/

/*!
    \fn int QMultiMap::remove(const Key &key)
    \overload
    \sa QMap::remove()
*/

/*!
    \fn int QMultiMap::count(const Key &key, const T &value) const
    \since 4.3

    Returns the number of items with key \a key and value \a value.

    \sa QMap::count()
*/

/*!
    \fn int QMultiMap::count(const Key &key) const
    \overload
    \sa QMap::count()
*/

/*!
    \fn int QMultiMap::count() const
    \overload
    \sa QMap::count()
*/

/*!
    \fn typename QMap<Key, T>::iterator QMultiMap::find(const Key &key, const T &value)
    \since 4.3

    Returns an iterator pointing to the item with key \a key and
    value \a value in the map.

    If the map contains no such item, the function returns end().

    If the map contains multiple items with key \a key, this
    function returns an iterator that points to the most recently
    inserted value.

    \sa QMap::find()
*/

/*!
    \fn typename QMap<Key, T>::iterator QMultiMap::find(const Key &key)
    \overload
    \sa QMap::find()
*/

/*!
    \fn typename QMap<Key, T>::const_iterator QMultiMap::find(const Key &key, const T &value) const
    \since 4.3
    \overload

    Returns a const iterator pointing to the item with the given \a key and
    \a value in the map.

    If the map contains no such item, the function returns end().

    If the map contains multiple items with the specified \a key, this
    function returns a const iterator that points to the most recently
    inserted value.

    \sa QMap::find()
*/

/*!
    \fn typename QMap<Key, T>::const_iterator QMultiMap::find(const Key &key) const
    \since 4.3
    \overload
    \sa QMap::find()
*/

/*!
    \fn typename QMap<Key, T>::const_iterator QMultiMap::constFind(const Key &key, const T &value) const
    \since 4.3

    Returns an iterator pointing to the item with key \a key and the
    value \a value in the map.

    If the map contains no such item, the function returns
    constEnd().

    \sa QMap::constFind()
*/

/*!
    \fn typename QMap<Key, T>::const_iterator QMultiMap::constFind(const Key &key) const
    \overload
    \sa QMap::constFind()
*/

/*!
    \fn T &QMap::iterator::data() const

    Use value() instead.
*/

/*!
    \fn const T &QMap::const_iterator::data() const

    Use value() instead.
*/

/*!
    \fn iterator QMap::remove(iterator it)

    Use erase(\a it) instead.
*/

/*!
    \fn void QMap::erase(const Key &key)

    Use remove(\a key) instead.
*/

/*!
    \fn iterator QMap::insert(const Key &key, const T &value, bool overwrite);

    Use the two-argument insert() overload instead. If you don't want
    to overwrite, call contains() beforehand.

    \oldcode
        QMap<QString, int> map;
        ...
        map.insert("delay", 30000, false);
    \newcode
        QMap<QString, int> map;
        ...
        if (!map.contains("delay"))
            map.insert("delay", 30000);
    \endcode
*/

/*!
    \fn iterator QMap::replace(const Key &key, const T &value)

    Use remove() then insert().
*/

QT_END_NAMESPACE