summaryrefslogtreecommitdiffstats
path: root/doc/html/ntqptrlist.html
blob: 305b4994960d863151f3658a3f1a2b3fe57f1ab3 (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
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/qptrlist.doc:41 -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>TQPtrList Class</title>
<style type="text/css"><!--
fn { margin-left: 1cm; text-indent: -1cm; }
a:link { color: #004faf; text-decoration: none }
a:visited { color: #672967; text-decoration: none }
body { background: #ffffff; color: black; }
--></style>
</head>
<body>

<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr bgcolor="#E5E5E5">
<td valign=center>
 <a href="index.html">
<font color="#004faf">Home</font></a>
 | <a href="classes.html">
<font color="#004faf">All&nbsp;Classes</font></a>
 | <a href="mainclasses.html">
<font color="#004faf">Main&nbsp;Classes</font></a>
 | <a href="annotated.html">
<font color="#004faf">Annotated</font></a>
 | <a href="groups.html">
<font color="#004faf">Grouped&nbsp;Classes</font></a>
 | <a href="functions.html">
<font color="#004faf">Functions</font></a>
</td>
<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQPtrList Class Reference</h1>

<p>The TQPtrList class is a template class that provides a list.
<a href="#details">More...</a>
<p><tt>#include &lt;<a href="qptrlist-h.html">ntqptrlist.h</a>&gt;</tt>
<p>Inherits <a href="ntqptrcollection.html">TQPtrCollection</a>.
<p>Inherited by <a href="ntqobjectlist.html">TQObjectList</a>, <a href="ntqsortedlist.html">TQSortedList</a>, and <a href="ntqstrlist.html">TQStrList</a>.
<p><a href="qptrlist-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn><a href="#TQPtrList"><b>TQPtrList</b></a> ()</li>
<li class=fn><a href="#TQPtrList-2"><b>TQPtrList</b></a> ( const&nbsp;TQPtrList&lt;type&gt;&nbsp;&amp;&nbsp;list )</li>
<li class=fn><a href="#~TQPtrList"><b>~TQPtrList</b></a> ()</li>
<li class=fn>TQPtrList&lt;type&gt; &amp; <a href="#operator-eq"><b>operator=</b></a> ( const&nbsp;TQPtrList&lt;type&gt;&nbsp;&amp;&nbsp;list )</li>
<li class=fn>bool <a href="#operator-eq-eq"><b>operator==</b></a> ( const&nbsp;TQPtrList&lt;type&gt;&nbsp;&amp;&nbsp;list ) const</li>
<li class=fn>bool <a href="#operator!-eq"><b>operator!=</b></a> ( const&nbsp;TQPtrList&lt;type&gt;&nbsp;&amp;&nbsp;list ) const</li>
<li class=fn>virtual uint <a href="#count"><b>count</b></a> () const</li>
<li class=fn>bool <a href="#isEmpty"><b>isEmpty</b></a> () const</li>
<li class=fn>bool <a href="#insert"><b>insert</b></a> ( uint&nbsp;index, const&nbsp;type&nbsp;*&nbsp;item )</li>
<li class=fn>void <a href="#inSort"><b>inSort</b></a> ( const&nbsp;type&nbsp;*&nbsp;item )</li>
<li class=fn>void <a href="#prepend"><b>prepend</b></a> ( const&nbsp;type&nbsp;*&nbsp;item )</li>
<li class=fn>void <a href="#append"><b>append</b></a> ( const&nbsp;type&nbsp;*&nbsp;item )</li>
<li class=fn>bool <a href="#remove"><b>remove</b></a> ( uint&nbsp;index )</li>
<li class=fn>bool <a href="#remove-2"><b>remove</b></a> ()</li>
<li class=fn>bool <a href="#remove-3"><b>remove</b></a> ( const&nbsp;type&nbsp;*&nbsp;item )</li>
<li class=fn>bool <a href="#removeRef"><b>removeRef</b></a> ( const&nbsp;type&nbsp;*&nbsp;item )</li>
<li class=fn>void <a href="#removeNode"><b>removeNode</b></a> ( TQLNode&nbsp;*&nbsp;node )</li>
<li class=fn>bool <a href="#removeFirst"><b>removeFirst</b></a> ()</li>
<li class=fn>bool <a href="#removeLast"><b>removeLast</b></a> ()</li>
<li class=fn>type * <a href="#take"><b>take</b></a> ( uint&nbsp;index )</li>
<li class=fn>type * <a href="#take-2"><b>take</b></a> ()</li>
<li class=fn>type * <a href="#takeNode"><b>takeNode</b></a> ( TQLNode&nbsp;*&nbsp;node )</li>
<li class=fn>virtual void <a href="#clear"><b>clear</b></a> ()</li>
<li class=fn>void <a href="#sort"><b>sort</b></a> ()</li>
<li class=fn>int <a href="#find"><b>find</b></a> ( const&nbsp;type&nbsp;*&nbsp;item )</li>
<li class=fn>int <a href="#findNext"><b>findNext</b></a> ( const&nbsp;type&nbsp;*&nbsp;item )</li>
<li class=fn>int <a href="#findRef"><b>findRef</b></a> ( const&nbsp;type&nbsp;*&nbsp;item )</li>
<li class=fn>int <a href="#findNextRef"><b>findNextRef</b></a> ( const&nbsp;type&nbsp;*&nbsp;item )</li>
<li class=fn>uint <a href="#contains"><b>contains</b></a> ( const&nbsp;type&nbsp;*&nbsp;item ) const</li>
<li class=fn>uint <a href="#containsRef"><b>containsRef</b></a> ( const&nbsp;type&nbsp;*&nbsp;item ) const</li>
<li class=fn>bool <a href="#replace"><b>replace</b></a> ( uint&nbsp;index, const&nbsp;type&nbsp;*&nbsp;item )</li>
<li class=fn>type * <a href="#at"><b>at</b></a> ( uint&nbsp;index )</li>
<li class=fn>int <a href="#at-2"><b>at</b></a> () const</li>
<li class=fn>type * <a href="#current"><b>current</b></a> () const</li>
<li class=fn>TQLNode * <a href="#currentNode"><b>currentNode</b></a> () const</li>
<li class=fn>type * <a href="#getFirst"><b>getFirst</b></a> () const</li>
<li class=fn>type * <a href="#getLast"><b>getLast</b></a> () const</li>
<li class=fn>type * <a href="#first"><b>first</b></a> ()</li>
<li class=fn>type * <a href="#last"><b>last</b></a> ()</li>
<li class=fn>type * <a href="#next"><b>next</b></a> ()</li>
<li class=fn>type * <a href="#prev"><b>prev</b></a> ()</li>
<li class=fn>void <a href="#toVector"><b>toVector</b></a> ( TQGVector&nbsp;*&nbsp;vec ) const</li>
</ul>
<h2>Important Inherited Members</h2>
<ul>
<li class=fn>bool <a href="#autoDelete"><b>autoDelete</b></a> () const</li>
<li class=fn>void <a href="#setAutoDelete"><b>setAutoDelete</b></a> ( bool&nbsp;enable )</li>
</ul>
<h2>Protected Members</h2>
<ul>
<li class=fn>virtual int <a href="#compareItems"><b>compareItems</b></a> ( TQPtrCollection::Item&nbsp;item1, TQPtrCollection::Item&nbsp;item2 )</li>
<li class=fn>virtual TQDataStream &amp; <a href="#read"><b>read</b></a> ( TQDataStream&nbsp;&amp;&nbsp;s, TQPtrCollection::Item&nbsp;&amp;&nbsp;item )</li>
<li class=fn>virtual TQDataStream &amp; <a href="#write"><b>write</b></a> ( TQDataStream&nbsp;&amp;&nbsp;s, TQPtrCollection::Item&nbsp;item ) const</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>


The TQPtrList class is a template class that provides a list.
<p> 

<p> 
<p> <a href="ntqvaluelist.html">TQValueList</a> is an STL-compatible alternative to this class.
<p> Define a template instance TQPtrList&lt;X&gt; to create a list that
operates on pointers to X (X*).
<p> The list class is indexable and has a <a href="#at">current
    index</a> and a <a href="#current">current item</a>. The
first item corresponds to index position 0. The current index is
-1 if the current item is 0.
<p> Items are inserted with <a href="#prepend">prepend</a>(), <a href="#insert">insert</a>() or <a href="#append">append</a>(). Items are
removed with <a href="#remove">remove</a>(), <a href="#removeRef">removeRef</a>(), <a href="#removeFirst">removeFirst</a>() and
<a href="#removeLast">removeLast</a>(). You can search for an item using <a href="#find">find</a>(), <a href="#findNext">findNext</a>(),
<a href="#findRef">findRef</a>() or <a href="#findNextRef">findNextRef</a>(). The list can be sorted with <a href="#sort">sort</a>().
You can count the number of occurrences of an item with <a href="#contains">contains</a>()
or <a href="#containsRef">containsRef</a>(). You can get a pointer to the current item with
<a href="#current">current</a>(), to an item at a particular index position in the list
with <a href="#at">at</a>() or to the first or last item with <a href="#getFirst">getFirst</a>() and
<a href="#getLast">getLast</a>(). You can also iterate over the list with <a href="#first">first</a>(),
<a href="#last">last</a>(), <a href="#next">next</a>() and <a href="#prev">prev</a>() (which all update current()). The list's
deletion property is set with <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>().
<p> <a name="example"></a>
Example:
<pre>
    class Employee
    {
    public:
        Employee() : sn( 0 ) { }
        Employee( const <a href="ntqstring.html">TQString</a>&amp; forename, const <a href="ntqstring.html">TQString</a>&amp; surname, int salary )
            : fn( forename ), sn( surname ), sal( salary )
        { }

        void setSalary( int salary ) { sal = salary; }

        <a href="ntqstring.html">TQString</a> forename() const { return fn; }
        <a href="ntqstring.html">TQString</a> surname() const { return sn; }
        int salary() const { return sal; }

    private:
        <a href="ntqstring.html">TQString</a> fn;
        <a href="ntqstring.html">TQString</a> sn;
        int sal;
    };

    TQPtrList&lt;Employee&gt; list;
    list.<a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>( TRUE ); // the list owns the objects

    list.<a href="#append">append</a>( new Employee("John", "Doe", 50000) );
    list.<a href="#append">append</a>( new Employee("Jane", "Williams", 80000) );
    list.<a href="#append">append</a>( new Employee("Tom", "Jones", 60000) );

    Employee *employee;
    for ( employee = list.<a href="#first">first</a>(); employee; employee = list.<a href="#next">next</a>() )
        cout &lt;&lt; employee-&gt;surname().latin1() &lt;&lt; ", " &lt;&lt;
                employee-&gt;forename().latin1() &lt;&lt; " earns " &lt;&lt;
                employee-&gt;salary() &lt;&lt; endl;
    cout &lt;&lt; endl;

    // very inefficient for big lists
    for ( uint i = 0; i &lt; list.<a href="#count">count</a>(); ++i )
        if ( list.<a href="#at">at</a>(i) )
            cout &lt;&lt; list.<a href="#at">at</a>( i )-&gt;surname().latin1() &lt;&lt; endl;
    </pre>
 
<p> The output is
<pre>
    Doe, John earns 50000
    Williams, Jane earns 80000
    Jones, Tom earns 60000

    Doe
    Williams
    Jones
    </pre>
 
<p> TQPtrList has several member functions for traversing the list, but
using a <a href="qptrlistiterator.html">TQPtrListIterator</a> can be more practical. Multiple list
iterators may traverse the same list, independently of each other
and of the current list item.
<p> In the example above we make the call <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>(TRUE).
Enabling auto-deletion tells the list to delete items that are
removed. The default is to not delete items when they are removed
but this would cause a memory leak in the example because there
are no other references to the list items.
<p> When inserting an item into a list only the pointer is copied, not
the item itself, i.e. a <a href="shclass.html#shallow-copy">shallow copy</a>. It is possible to make the
list copy all of the item's data (deep copy) when an item is
inserted. <a href="#insert">insert</a>(), <a href="#inSort">inSort</a>() and <a href="#append">append</a>() call the virtual
function <a href="ntqptrcollection.html#newItem">TQPtrCollection::newItem</a>() for the item to be inserted.
Inherit a list and reimplement <a href="ntqptrcollection.html#newItem">newItem</a>() to have deep copies.
<p> When removing an item from a list, the virtual function
<a href="ntqptrcollection.html#deleteItem">TQPtrCollection::deleteItem</a>() is called. TQPtrList's default
implementation is to delete the item if auto-deletion is enabled.
<p> The virtual function <a href="#compareItems">compareItems</a>() can be reimplemented to
compare two list items. This function is called from all list
functions that need to compare list items, for instance
<a href="#remove">remove</a>(const type*). If you only want to deal with pointers, there
are functions that compare pointers instead, for instance
<a href="#removeRef">removeRef</a>(const type*). These functions are somewhat faster than
those that call compareItems().
<p> List items are stored as <tt>void*</tt> in an internal TQLNode, which
also holds pointers to the next and previous list items. The
functions <a href="#currentNode">currentNode</a>(), <a href="#removeNode">removeNode</a>(), and <a href="#takeNode">takeNode</a>() operate
directly on the TQLNode, but they should be used with care. The
data component of the node is available through TQLNode::getData().
<p> The <a href="ntqstrlist.html">TQStrList</a> class defined in <a href="qstrlist-h.html">ntqstrlist.h</a> is a list of <tt>char*</tt>.
It reimplements <a href="ntqptrcollection.html#newItem">newItem</a>(), <a href="ntqptrcollection.html#deleteItem">deleteItem</a>() and <a href="#compareItems">compareItems</a>(). (But
see <a href="ntqstringlist.html">TQStringList</a> for a list of Unicode TQStrings.)
<p> <p>See also <a href="qptrlistiterator.html">TQPtrListIterator</a>, <a href="collection.html">Collection Classes</a>, and <a href="tools.html">Non-GUI Classes</a>.

<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="TQPtrList"></a>TQPtrList::TQPtrList ()
</h3>

<p> Constructs an empty list.

<h3 class=fn><a name="TQPtrList-2"></a>TQPtrList::TQPtrList ( const&nbsp;<a href="ntqptrlist.html">TQPtrList</a>&lt;type&gt;&nbsp;&amp;&nbsp;list )
</h3>

<p> Constructs a copy of <em>list</em>.
<p> Each item in <em>list</em> is <a href="#append">appended</a> to this
list. Only the pointers are copied (shallow copy).

<h3 class=fn><a name="~TQPtrList"></a>TQPtrList::~TQPtrList ()
</h3>

<p> Removes all items from the list and destroys the list.
<p> All list iterators that access this list will be reset.
<p> <p>See also <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>().

<h3 class=fn>void <a name="append"></a>TQPtrList::append ( const&nbsp;type&nbsp;*&nbsp;item )
</h3>

<p> Inserts the <em>item</em> at the end of the list.
<p> The inserted item becomes the current list item. This is
equivalent to <tt>insert( count(), item )</tt>.
<p> <em>item</em> must not be 0.
<p> <p>See also <a href="#insert">insert</a>(), <a href="#current">current</a>(), and <a href="#prepend">prepend</a>().

<p>Examples: <a href="customlayout-example.html#x1500">customlayout/border.cpp</a>, <a href="customlayout-example.html#x1518">customlayout/card.cpp</a>, <a href="customlayout-example.html#x1477">customlayout/flow.cpp</a>, <a href="grapher-nsplugin-example.html#x2770">grapher/grapher.cpp</a>, <a href="listviews-example.html#x160">listviews/listviews.cpp</a>, <a href="listviews-example.html#x131">listviews/listviews.h</a>, and <a href="qwerty-example.html#x387">qwerty/qwerty.cpp</a>.
<h3 class=fn>type * <a name="at"></a>TQPtrList::at ( uint&nbsp;index )
</h3>

<p> Returns a pointer to the item at position <em>index</em> in the list, or
0 if the index is out of range.
<p> Sets the current list item to this item if <em>index</em> is valid. The
valid range is <tt>0..(count() - 1)</tt> inclusive.
<p> This function is very efficient. It starts scanning from the first
item, last item, or current item, whichever is closest to <em>index</em>.
<p> <p>See also <a href="#current">current</a>().

<p>Examples: <a href="customlayout-example.html#x1501">customlayout/border.cpp</a>, <a href="customlayout-example.html#x1519">customlayout/card.cpp</a>, <a href="customlayout-example.html#x1478">customlayout/flow.cpp</a>, <a href="dirview-example.html#x1697">dirview/dirview.cpp</a>, <a href="mdi-example.html#x2053">mdi/application.cpp</a>, and <a href="qwerty-example.html#x388">qwerty/qwerty.cpp</a>.
<h3 class=fn>int <a name="at-2"></a>TQPtrList::at () const
</h3>

<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Returns the index of the current list item. The returned value is
-1 if the current item is 0.
<p> <p>See also <a href="#current">current</a>().

<h3 class=fn>bool <a name="autoDelete"></a>TQPtrCollection::autoDelete () const
</h3>

<p> Returns the setting of the auto-delete option. The default is FALSE.
<p> <p>See also <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>().

<h3 class=fn>void <a name="clear"></a>TQPtrList::clear ()<tt> [virtual]</tt>
</h3>

<p> Removes all items from the list.
<p> The removed items are deleted if <a href="ntqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled.
<p> All list iterators that access this list will be reset.
<p> <p>See also <a href="#remove">remove</a>(), <a href="#take">take</a>(), and <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>().

<p>Reimplemented from <a href="ntqptrcollection.html#clear">TQPtrCollection</a>.
<h3 class=fn>int <a name="compareItems"></a>TQPtrList::compareItems ( <a href="ntqptrcollection.html#Item">TQPtrCollection::Item</a>&nbsp;item1, <a href="ntqptrcollection.html#Item">TQPtrCollection::Item</a>&nbsp;item2 )<tt> [virtual protected]</tt>
</h3>

<p> This virtual function compares two list items.
<p> Returns:
<ul>
<li> zero if <em>item1</em> == <em>item2</em>
<li> nonzero if <em>item1</em> != <em>item2</em>
</ul>
<p> This function returns <em>int</em> rather than <em>bool</em> so that
reimplementations can return three values and use it to sort by:
<p> <ul>
<li> 0 if <em>item1</em> == <em>item2</em>
<li> &gt; 0 (positive integer) if <em>item1</em> &gt; <em>item2</em>
<li> &lt; 0 (negative integer) if <em>item1</em> &lt; <em>item2</em>
</ul>
<p> <a href="#inSort">inSort</a>() requires that <a href="#compareItems">compareItems</a>() is implemented as described
here.
<p> This function should not modify the list because some const
functions call compareItems().
<p> The default implementation compares the pointers.

<h3 class=fn>uint <a name="contains"></a>TQPtrList::contains ( const&nbsp;type&nbsp;*&nbsp;item ) const
</h3>

<p> Returns the number of occurrences of <em>item</em> in the list.
<p> The <a href="#compareItems">compareItems</a>() function is called when looking for the <em>item</em>
in the list. If compareItems() is not reimplemented, it is more
efficient to call <a href="#containsRef">containsRef</a>().
<p> This function does not affect the current list item.
<p> <p>See also <a href="#containsRef">containsRef</a>() and <a href="#compareItems">compareItems</a>().

<h3 class=fn>uint <a name="containsRef"></a>TQPtrList::containsRef ( const&nbsp;type&nbsp;*&nbsp;item ) const
</h3>

<p> Returns the number of occurrences of <em>item</em> in the list.
<p> Calling this function is much faster than <a href="#contains">contains</a>() because
contains() compares <em>item</em> with each list item using
<a href="#compareItems">compareItems</a>(), whereas his function only compares the pointers.
<p> This function does not affect the current list item.
<p> <p>See also <a href="#contains">contains</a>().

<h3 class=fn>uint <a name="count"></a>TQPtrList::count () const<tt> [virtual]</tt>
</h3>

<p> Returns the number of items in the list.
<p> <p>See also <a href="#isEmpty">isEmpty</a>().

<p>Examples: <a href="customlayout-example.html#x1502">customlayout/border.cpp</a>, <a href="customlayout-example.html#x1520">customlayout/card.cpp</a>, <a href="customlayout-example.html#x1479">customlayout/flow.cpp</a>, <a href="dirview-example.html#x1699">dirview/dirview.cpp</a>, <a href="grapher-nsplugin-example.html#x2771">grapher/grapher.cpp</a>, <a href="mdi-example.html#x2054">mdi/application.cpp</a>, and <a href="qwerty-example.html#x389">qwerty/qwerty.cpp</a>.
<p>Reimplemented from <a href="ntqptrcollection.html#count">TQPtrCollection</a>.
<h3 class=fn>type * <a name="current"></a>TQPtrList::current () const
</h3>

<p> Returns a pointer to the current list item. The current item may
be 0 (implies that the current index is -1). 
<p> <p>See also <a href="#at">at</a>().

<h3 class=fn>TQLNode * <a name="currentNode"></a>TQPtrList::currentNode () const
</h3>

<p> Returns a pointer to the current list node.
<p> The node can be kept and removed later using <a href="#removeNode">removeNode</a>(). The
advantage is that the item can be removed directly without
searching the list.
<p> <b>Warning:</b> Do not call this function unless you are an expert.
<p> <p>See also <a href="#removeNode">removeNode</a>(), <a href="#takeNode">takeNode</a>(), and <a href="#current">current</a>().

<h3 class=fn>int <a name="find"></a>TQPtrList::find ( const&nbsp;type&nbsp;*&nbsp;item )
</h3>

<p> Finds the first occurrence of <em>item</em> in the list.
<p> If the item is found, the list sets the current item to point to
the found item and returns the index of this item. If the item is
not found, the list sets the current item to 0, the current
index to -1, and returns -1.
<p> The <a href="#compareItems">compareItems</a>() function is called when searching for the item
in the list. If compareItems() is not reimplemented, it is more
efficient to call <a href="#findRef">findRef</a>().
<p> <p>See also <a href="#findNext">findNext</a>(), <a href="#findRef">findRef</a>(), <a href="#compareItems">compareItems</a>(), and <a href="#current">current</a>().

<h3 class=fn>int <a name="findNext"></a>TQPtrList::findNext ( const&nbsp;type&nbsp;*&nbsp;item )
</h3>

<p> Finds the next occurrence of <em>item</em> in the list, starting from
the current list item.
<p> If the item is found, the list sets the current item to point to
the found item and returns the index of this item. If the item is
not found, the list sets the current item to 0, the current
index to -1, and returns -1.
<p> The <a href="#compareItems">compareItems</a>() function is called when searching for the item
in the list. If compareItems() is not reimplemented, it is more
efficient to call <a href="#findNextRef">findNextRef</a>().
<p> <p>See also <a href="#find">find</a>(), <a href="#findNextRef">findNextRef</a>(), <a href="#compareItems">compareItems</a>(), and <a href="#current">current</a>().

<h3 class=fn>int <a name="findNextRef"></a>TQPtrList::findNextRef ( const&nbsp;type&nbsp;*&nbsp;item )
</h3>

<p> Finds the next occurrence of <em>item</em> in the list, starting from
the current list item.
<p> If the item is found, the list sets the current item to point to
the found item and returns the index of this item. If the item is
not found, the list sets the current item to 0, the current
index to -1, and returns -1.
<p> Calling this function is much faster than <a href="#findNext">findNext</a>() because
findNext() compares <em>item</em> with each list item using
<a href="#compareItems">compareItems</a>(), whereas this function only compares the pointers.
<p> <p>See also <a href="#findRef">findRef</a>(), <a href="#findNext">findNext</a>(), and <a href="#current">current</a>().

<h3 class=fn>int <a name="findRef"></a>TQPtrList::findRef ( const&nbsp;type&nbsp;*&nbsp;item )
</h3>

<p> Finds the first occurrence of <em>item</em> in the list.
<p> If the item is found, the list sets the current item to point to
the found item and returns the index of this item. If the item is
not found, the list sets the current item to 0, the current
index to -1, and returns -1.
<p> Calling this function is much faster than <a href="#find">find</a>() because find()
compares <em>item</em> with each list item using <a href="#compareItems">compareItems</a>(), whereas
this function only compares the pointers.
<p> <p>See also <a href="#findNextRef">findNextRef</a>(), <a href="#find">find</a>(), and <a href="#current">current</a>().

<h3 class=fn>type * <a name="first"></a>TQPtrList::first ()
</h3>

<p> Returns a pointer to the first item in the list and makes this the
current list item; returns 0 if the list is empty.
<p> <p>See also <a href="#getFirst">getFirst</a>(), <a href="#last">last</a>(), <a href="#next">next</a>(), <a href="#prev">prev</a>(), and <a href="#current">current</a>().

<p>Examples: <a href="grapher-nsplugin-example.html#x2772">grapher/grapher.cpp</a>, <a href="listviews-example.html#x132">listviews/listviews.h</a>, and <a href="showimg-example.html#x1343">showimg/showimg.cpp</a>.
<h3 class=fn>type * <a name="getFirst"></a>TQPtrList::getFirst () const
</h3>

<p> Returns a pointer to the first item in the list, or 0 if the list
is empty.
<p> This function does not affect the current list item.
<p> <p>See also <a href="#first">first</a>() and <a href="#getLast">getLast</a>().

<h3 class=fn>type * <a name="getLast"></a>TQPtrList::getLast () const
</h3>

<p> Returns a pointer to the last item in the list, or 0 if the list
is empty.
<p> This function does not affect the current list item.
<p> <p>See also <a href="#last">last</a>() and <a href="#getFirst">getFirst</a>().

<h3 class=fn>void <a name="inSort"></a>TQPtrList::inSort ( const&nbsp;type&nbsp;*&nbsp;item )
</h3>

<p> Inserts the <em>item</em> at its sorted position in the list.
<p> The sort order depends on the virtual <a href="#compareItems">compareItems</a>() function. All
items must be inserted with <a href="#inSort">inSort</a>() to maintain the sorting
order.
<p> The inserted item becomes the current list item.
<p> <em>item</em> must not be 0.
<p> <b>Warning:</b> Using inSort() is slow. An alternative, especially if you
have lots of items, is to simply <a href="#append">append</a>() or <a href="#insert">insert</a>() them and
then use <a href="#sort">sort</a>(). inSort() takes up to O(n) compares. That means
inserting n items in your list will need O(n^2) compares whereas
sort() only needs O(n*log n) for the same task. So use inSort()
only if you already have a presorted list and want to insert just
a few additional items.
<p> <p>See also <a href="#insert">insert</a>(), <a href="#compareItems">compareItems</a>(), <a href="#current">current</a>(), and <a href="#sort">sort</a>().

<h3 class=fn>bool <a name="insert"></a>TQPtrList::insert ( uint&nbsp;index, const&nbsp;type&nbsp;*&nbsp;item )
</h3>

<p> Inserts the <em>item</em> at position <em>index</em> in the list.
<p> Returns TRUE if successful, i.e. if <em>index</em> is in range;
otherwise returns FALSE. The valid range is 0 to <a href="#count">count</a>()
(inclusively). The item is appended if <em>index</em> == count().
<p> The inserted item becomes the current list item.
<p> <em>item</em> must not be 0.
<p> <p>See also <a href="#append">append</a>(), <a href="#current">current</a>(), and <a href="#replace">replace</a>().

<h3 class=fn>bool <a name="isEmpty"></a>TQPtrList::isEmpty () const
</h3>

<p> Returns TRUE if the list is empty; otherwise returns FALSE.
<p> <p>See also <a href="#count">count</a>().

<h3 class=fn>type * <a name="last"></a>TQPtrList::last ()
</h3>

<p> Returns a pointer to the last item in the list and makes this the
current list item; returns 0 if the list is empty.
<p> <p>See also <a href="#getLast">getLast</a>(), <a href="#first">first</a>(), <a href="#next">next</a>(), <a href="#prev">prev</a>(), and <a href="#current">current</a>().

<h3 class=fn>type * <a name="next"></a>TQPtrList::next ()
</h3>

<p> Returns a pointer to the item succeeding the current item. Returns
0 if the current item is 0 or equal to the last item.
<p> Makes the succeeding item current. If the current item before this
function call was the last item, the current item will be set to
0. If the current item was 0, this function does nothing.
<p> <p>See also <a href="#first">first</a>(), <a href="#last">last</a>(), <a href="#prev">prev</a>(), and <a href="#current">current</a>().

<p>Examples: <a href="grapher-nsplugin-example.html#x2773">grapher/grapher.cpp</a>, <a href="listviews-example.html#x133">listviews/listviews.h</a>, and <a href="showimg-example.html#x1344">showimg/showimg.cpp</a>.
<h3 class=fn>bool <a name="operator!-eq"></a>TQPtrList::operator!= ( const&nbsp;<a href="ntqptrlist.html">TQPtrList</a>&lt;type&gt;&nbsp;&amp;&nbsp;list ) const
</h3>

<p> Compares this list with <em>list</em>. Returns TRUE if the lists contain
different data; otherwise returns FALSE.

<h3 class=fn><a href="ntqptrlist.html">TQPtrList</a>&lt;type&gt;&nbsp;&amp; <a name="operator-eq"></a>TQPtrList::operator= ( const&nbsp;<a href="ntqptrlist.html">TQPtrList</a>&lt;type&gt;&nbsp;&amp;&nbsp;list )
</h3>

<p> Assigns <em>list</em> to this list and returns a reference to this list.
<p> This list is first cleared and then each item in <em>list</em> is <a href="#append">appended</a> to this list. Only the pointers are
copied (shallow copy) unless <a href="ntqptrcollection.html#newItem">newItem</a>() has been reimplemented.

<h3 class=fn>bool <a name="operator-eq-eq"></a>TQPtrList::operator== ( const&nbsp;<a href="ntqptrlist.html">TQPtrList</a>&lt;type&gt;&nbsp;&amp;&nbsp;list ) const
</h3>

<p> Compares this list with <em>list</em>. Returns TRUE if the lists contain
the same data; otherwise returns FALSE.

<h3 class=fn>void <a name="prepend"></a>TQPtrList::prepend ( const&nbsp;type&nbsp;*&nbsp;item )
</h3>

<p> Inserts the <em>item</em> at the start of the list.
<p> The inserted item becomes the current list item. This is
equivalent to <tt>insert( 0, item )</tt>.
<p> <em>item</em> must not be 0.
<p> <p>See also <a href="#append">append</a>(), <a href="#insert">insert</a>(), and <a href="#current">current</a>().

<h3 class=fn>type * <a name="prev"></a>TQPtrList::prev ()
</h3>

<p> Returns a pointer to the item preceding the current item. Returns
0 if the current item is 0 or equal to the first item.
<p> Makes the preceding item current. If the current item before this
function call was the first item, the current item will be set to
0. If the current item was 0, this function does nothing.
<p> <p>See also <a href="#first">first</a>(), <a href="#last">last</a>(), <a href="#next">next</a>(), and <a href="#current">current</a>().

<h3 class=fn><a href="ntqdatastream.html">TQDataStream</a>&nbsp;&amp; <a name="read"></a>TQPtrList::read ( <a href="ntqdatastream.html">TQDataStream</a>&nbsp;&amp;&nbsp;s, <a href="ntqptrcollection.html#Item">TQPtrCollection::Item</a>&nbsp;&amp;&nbsp;item )<tt> [virtual protected]</tt>
</h3>

<p> Reads a list item from the stream <em>s</em> and returns a reference to
the stream.
<p> The default implementation sets <em>item</em> to 0.
<p> <p>See also <a href="#write">write</a>().

<h3 class=fn>bool <a name="remove"></a>TQPtrList::remove ( uint&nbsp;index )
</h3>

<p> Removes the item at position <em>index</em> in the list.
<p> Returns TRUE if successful, i.e. if <em>index</em> is in range;
otherwise returns FALSE. The valid range is <tt>0..(count() - 1)</tt>
inclusive.
<p> The removed item is deleted if <a href="ntqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled.
<p> The item after the removed item becomes the new current list item
if the removed item is not the last item in the list. If the last
item is removed, the new last item becomes the current item.
<p> All list iterators that refer to the removed item will be set to
point to the new current item.
<p> <p>See also <a href="#take">take</a>(), <a href="#clear">clear</a>(), <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>(), <a href="#current">current</a>(), and <a href="#removeRef">removeRef</a>().

<h3 class=fn>bool <a name="remove-2"></a>TQPtrList::remove ()
</h3>

<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Removes the current list item.
<p> Returns TRUE if successful, i.e. if the current item isn't 0;
otherwise returns FALSE.
<p> The removed item is deleted if <a href="ntqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled.
<p> The item after the removed item becomes the new current list item
if the removed item is not the last item in the list. If the last
item is removed, the new last item becomes the current item. The
current item is set to 0 if the list becomes empty.
<p> All list iterators that refer to the removed item will be set to
point to the new current item.
<p> <p>See also <a href="#take">take</a>(), <a href="#clear">clear</a>(), <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>(), <a href="#current">current</a>(), and <a href="#removeRef">removeRef</a>().

<h3 class=fn>bool <a name="remove-3"></a>TQPtrList::remove ( const&nbsp;type&nbsp;*&nbsp;item )
</h3>

<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Removes the first occurrence of <em>item</em> from the list.
<p> Returns TRUE if successful, i.e. if <em>item</em> is in the list;
otherwise returns FALSE.
<p> The removed item is deleted if <a href="ntqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled.
<p> The <a href="#compareItems">compareItems</a>() function is called when searching for the item
in the list. If compareItems() is not reimplemented, it is more
efficient to call <a href="#removeRef">removeRef</a>().
<p> If <em>item</em> is NULL then the current item is removed from the list.
<p> The item after the removed item becomes the new current list item
if the removed item is not the last item in the list. If the last
item is removed, the new last item becomes the current item. The
current item is set to 0 if the list becomes empty.
<p> All list iterators that refer to the removed item will be set to
point to the new current item.
<p> <p>See also <a href="#removeRef">removeRef</a>(), <a href="#take">take</a>(), <a href="#clear">clear</a>(), <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>(), <a href="#compareItems">compareItems</a>(), and <a href="#current">current</a>().

<h3 class=fn>bool <a name="removeFirst"></a>TQPtrList::removeFirst ()
</h3>

<p> Removes the first item from the list. Returns TRUE if successful,
i.e. if the list isn't empty; otherwise returns FALSE.
<p> The removed item is deleted if <a href="ntqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled.
<p> The first item in the list becomes the new current list item. The
current item is set to 0 if the list becomes empty.
<p> All list iterators that refer to the removed item will be set to
point to the new current item.
<p> <p>See also <a href="#removeLast">removeLast</a>(), <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>(), <a href="#current">current</a>(), and <a href="#remove">remove</a>().

<h3 class=fn>bool <a name="removeLast"></a>TQPtrList::removeLast ()
</h3>

<p> Removes the last item from the list. Returns TRUE if successful,
i.e. if the list isn't empty; otherwise returns FALSE.
<p> The removed item is deleted if <a href="ntqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled.
<p> The last item in the list becomes the new current list item. The
current item is set to 0 if the list becomes empty.
<p> All list iterators that refer to the removed item will be set to
point to the new current item.
<p> <p>See also <a href="#removeFirst">removeFirst</a>(), <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>(), and <a href="#current">current</a>().

<h3 class=fn>void <a name="removeNode"></a>TQPtrList::removeNode ( TQLNode&nbsp;*&nbsp;node )
</h3>

<p> Removes the <em>node</em> from the list.
<p> This node must exist in the list, otherwise the program may crash.
<p> The removed item is deleted if <a href="ntqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled.
<p> The first item in the list will become the new current list item.
The current item is set to 0 if the list becomes empty.
<p> All list iterators that refer to the removed item will be set to
point to the item succeeding this item or to the preceding item if
the removed item was the last item.
<p> <b>Warning:</b> Do not call this function unless you are an expert.
<p> <p>See also <a href="#takeNode">takeNode</a>(), <a href="#currentNode">currentNode</a>(), <a href="#remove">remove</a>(), and <a href="#removeRef">removeRef</a>().

<h3 class=fn>bool <a name="removeRef"></a>TQPtrList::removeRef ( const&nbsp;type&nbsp;*&nbsp;item )
</h3>

<p> Removes the first occurrence of <em>item</em> from the list.
<p> Returns TRUE if successful, i.e. if <em>item</em> is in the list;
otherwise returns FALSE.
<p> The removed item is deleted if <a href="ntqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled.
<p> Equivalent to:
<pre>
        if ( list.findRef( item ) != -1 )
            list.remove();
    </pre>
 
<p> The item after the removed item becomes the new current list item
if the removed item is not the last item in the list. If the last
item is removed, the new last item becomes the current item. The
current item is set to 0 if the list becomes empty.
<p> All list iterators that refer to the removed item will be set to
point to the new current item.
<p> <p>See also <a href="#remove">remove</a>(), <a href="#clear">clear</a>(), <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>(), and <a href="#current">current</a>().

<h3 class=fn>bool <a name="replace"></a>TQPtrList::replace ( uint&nbsp;index, const&nbsp;type&nbsp;*&nbsp;item )
</h3>

<p> Replaces the item at position <em>index</em> with the new <em>item</em>. 
<p> Returns TRUE if successful, i.e. <em>index</em> is in the range 0 to
<a href="#count">count</a>()-1.
<p> <p>See also <a href="#append">append</a>(), <a href="#current">current</a>(), and <a href="#insert">insert</a>().

<h3 class=fn>void <a name="setAutoDelete"></a>TQPtrCollection::setAutoDelete ( bool&nbsp;enable )
</h3>

<p> Sets the collection to auto-delete its contents if <em>enable</em> is
TRUE and to never delete them if <em>enable</em> is FALSE.
<p> If auto-deleting is turned on, all the items in a collection are
deleted when the collection itself is deleted. This is convenient
if the collection has the only pointer to the items.
<p> The default setting is FALSE, for safety. If you turn it on, be
careful about copying the collection - you might find yourself
with two collections deleting the same items.
<p> Note that the auto-delete setting may also affect other functions
in subclasses. For example, a subclass that has a <a href="#remove">remove</a>()
function will remove the item from its data structure, and if
auto-delete is enabled, will also delete the item.
<p> <p>See also <a href="ntqptrcollection.html#autoDelete">autoDelete</a>().

<p>Examples: <a href="grapher-nsplugin-example.html#x2769">grapher/grapher.cpp</a>, <a href="scribble-example.html#x924">scribble/scribble.cpp</a>, and <a href="bigtable-example.html#x1291">table/bigtable/main.cpp</a>.
<h3 class=fn>void <a name="sort"></a>TQPtrList::sort ()
</h3>

<p> Sorts the list by the result of the virtual <a href="#compareItems">compareItems</a>()
function.
<p> The heap sort algorithm is used for sorting. It sorts n items with
O(n*log n) comparisons. This is the asymptotic optimal solution of
the sorting problem.
<p> If the items in your list support <a href="ntqcstring.html#operator-lt-2">operator&lt;</a>() and <a href="#operator-eq-eq">operator==</a>(),
you might be better off with TQSortedList because it implements the
compareItems() function for you using these two operators.
<p> <p>See also <a href="#inSort">inSort</a>().

<h3 class=fn>type * <a name="take"></a>TQPtrList::take ( uint&nbsp;index )
</h3>

<p> Takes the item at position <em>index</em> out of the list without
deleting it (even if <a href="ntqptrcollection.html#setAutoDelete">auto-deletion</a>
is enabled).
<p> Returns a pointer to the item taken out of the list, or 0 if the
index is out of range. The valid range is <tt>0..(count() - 1)</tt>
inclusive.
<p> The item after the removed item becomes the new current list item
if the removed item is not the last item in the list. If the last
item is removed, the new last item becomes the current item. The
current item is set to 0 if the list becomes empty.
<p> All list iterators that refer to the taken item will be set to
point to the new current item.
<p> <p>See also <a href="#remove">remove</a>(), <a href="#clear">clear</a>(), and <a href="#current">current</a>().

<p>Examples: <a href="customlayout-example.html#x1503">customlayout/border.cpp</a>, <a href="customlayout-example.html#x1521">customlayout/card.cpp</a>, and <a href="customlayout-example.html#x1480">customlayout/flow.cpp</a>.
<h3 class=fn>type * <a name="take-2"></a>TQPtrList::take ()
</h3>

<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Takes the current item out of the list without deleting it (even
if <a href="ntqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled).
<p> Returns a pointer to the item taken out of the list, or 0 if
the current item is 0.
<p> The item after the removed item becomes the new current list item
if the removed item is not the last item in the list. If the last
item is removed, the new last item becomes the current item. The
current item is set to 0 if the list becomes empty.
<p> All list iterators that refer to the taken item will be set to
point to the new current item.
<p> <p>See also <a href="#remove">remove</a>(), <a href="#clear">clear</a>(), and <a href="#current">current</a>().

<h3 class=fn>type * <a name="takeNode"></a>TQPtrList::takeNode ( TQLNode&nbsp;*&nbsp;node )
</h3>

<p> Takes the <em>node</em> out of the list without deleting its item (even
if <a href="ntqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled).
Returns a pointer to the item taken out of the list.
<p> This node must exist in the list, otherwise the program may crash.
<p> The first item in the list becomes the new current list item.
<p> All list iterators that refer to the taken item will be set to
point to the item succeeding this item or to the preceding item if
the taken item was the last item.
<p> <b>Warning:</b> Do not call this function unless you are an expert.
<p> <p>See also <a href="#removeNode">removeNode</a>() and <a href="#currentNode">currentNode</a>().

<h3 class=fn>void <a name="toVector"></a>TQPtrList::toVector ( TQGVector&nbsp;*&nbsp;vec ) const
</h3>

<p> Stores all list items in the vector <em>vec</em>.
<p> The vector must be of the same item type, otherwise the result
will be undefined.

<h3 class=fn><a href="ntqdatastream.html">TQDataStream</a>&nbsp;&amp; <a name="write"></a>TQPtrList::write ( <a href="ntqdatastream.html">TQDataStream</a>&nbsp;&amp;&nbsp;s, <a href="ntqptrcollection.html#Item">TQPtrCollection::Item</a>&nbsp;item ) const<tt> [virtual protected]</tt>
</h3>

<p> Writes a list item, <em>item</em> to the stream <em>s</em> and returns a
reference to the stream.
<p> The default implementation does nothing.
<p> <p>See also <a href="#read">read</a>().

<!-- eof -->
<hr><p>
This file is part of the <a href="index.html">TQt toolkit</a>.
Copyright &copy; 1995-2007
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
<table width=100% cellspacing=0 border=0><tr>
<td>Copyright &copy; 2007
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
<td align=right><div align=right>TQt 3.3.8</div>
</table></div></address></body>
</html>