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
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>TQDict 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 Classes</font></a>
| <a href="mainclasses.html">
<font color="#004faf">Main Classes</font></a>
| <a href="annotated.html">
<font color="#004faf">Annotated</font></a>
| <a href="groups.html">
<font color="#004faf">Grouped 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>TQDict Class Reference</h1>
<p>The TQDict class is a template class that provides a
dictionary based on TQString keys.
<a href="#details">More...</a>
<p><tt>#include <<a href="tqdict-h.html">tqdict.h</a>></tt>
<p>Inherits <a href="tqptrcollection.html">TQPtrCollection</a>.
<p><a href="tqdict-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn><a href="#TQDict"><b>TQDict</b></a> ( int size = 17, bool caseSensitive = TRUE )</li>
<li class=fn><a href="#TQDict-2"><b>TQDict</b></a> ( const TQDict<type> & dict )</li>
<li class=fn><a href="#~TQDict"><b>~TQDict</b></a> ()</li>
<li class=fn>TQDict<type> & <a href="#operator-eq"><b>operator=</b></a> ( const TQDict<type> & dict )</li>
<li class=fn>virtual uint <a href="#count"><b>count</b></a> () const</li>
<li class=fn>uint <a href="#size"><b>size</b></a> () const</li>
<li class=fn>bool <a href="#isEmpty"><b>isEmpty</b></a> () const</li>
<li class=fn>void <a href="#insert"><b>insert</b></a> ( const TQString & key, const type * item )</li>
<li class=fn>void <a href="#replace"><b>replace</b></a> ( const TQString & key, const type * item )</li>
<li class=fn>bool <a href="#remove"><b>remove</b></a> ( const TQString & key )</li>
<li class=fn>type * <a href="#take"><b>take</b></a> ( const TQString & key )</li>
<li class=fn>type * <a href="#find"><b>find</b></a> ( const TQString & key ) const</li>
<li class=fn>type * <a href="#operator[]"><b>operator[]</b></a> ( const TQString & key ) const</li>
<li class=fn>virtual void <a href="#clear"><b>clear</b></a> ()</li>
<li class=fn>void <a href="#resize"><b>resize</b></a> ( uint newsize )</li>
<li class=fn>void <a href="#statistics"><b>statistics</b></a> () 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 enable )</li>
</ul>
<h2>Protected Members</h2>
<ul>
<li class=fn>virtual TQDataStream & <a href="#read"><b>read</b></a> ( TQDataStream & s, TQPtrCollection::Item & item )</li>
<li class=fn>virtual TQDataStream & <a href="#write"><b>write</b></a> ( TQDataStream & s, TQPtrCollection::Item ) const</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
The TQDict class is a template class that provides a
dictionary based on <a href="tqstring.html">TQString</a> keys.
<p>
<p>
<p> <a href="tqmap.html">TQMap</a> is an STL-compatible alternative to this class.
<p> TQDict is implemented as a template class. Define a template
instance TQDict<X> to create a dictionary that operates on
pointers to X (X *).
<p> A dictionary is a collection of key-value pairs. The key is a
TQString used for insertion, removal and lookup. The value is a
pointer. Dictionaries provide very fast insertion and lookup.
<p> If you want to use non-Unicode, plain 8-bit <tt>char*</tt> keys, use the
<a href="tqasciidict.html">TQAsciiDict</a> template. A TQDict has the same performance as a
TQAsciiDict. If you want to have a dictionary that maps TQStrings to
TQStrings use TQMap.
<p> The <a href="#size">size</a>() of the dictionary is very important. In order to get
good performance, you should use a suitably large <a href="primes.html#prime">prime</a> number.
Suitable means equal to or larger than the maximum expected number
of dictionary items. Size is set in the constructor but may be
changed with <a href="#resize">resize</a>().
<p> Items are inserted with <a href="#insert">insert</a>(); 0 pointers cannot be inserted.
Items are removed with <a href="#remove">remove</a>(). All the items in a dictionary can
be removed with <a href="#clear">clear</a>(). The number of items in the dictionary is
returned by <a href="#count">count</a>(). If the dictionary contains no items <a href="#isEmpty">isEmpty</a>()
returns TRUE. You can change an item's value with <a href="#replace">replace</a>(). Items
are looked up with <a href="#operator[]">operator[]</a>(), or with <a href="#find">find</a>() which return a
pointer to the value or 0 if the given key does not exist. You can
take an item out of the dictionary with <a href="#take">take</a>().
<p> Calling <a href="tqptrcollection.html#setAutoDelete">setAutoDelete</a>(TRUE) for a dictionary tells it to delete
items that are removed. The default behaviour is not to delete
items when they are removed.
<p> When an item is inserted, the key is converted (hashed) to an
integer index into an internal hash array. This makes lookup very
fast.
<p> Items with equal keys are allowed. When inserting two items with
the same key, only the last inserted item will be accessible (last
in, first out) until it is removed.
<p> The <a href="tqdictiterator.html">TQDictIterator</a> class can traverse the dictionary, but only in
an arbitrary order. Multiple iterators may independently traverse
the same dictionary.
<p> When inserting an item into a dictionary, only the pointer is
copied, not the item itself, i.e. a <a href="shclass.html#shallow-copy">shallow copy</a> is made. It is
possible to make the dictionary copy all of the item's data (a
<a href="shclass.html#deep-copy">deep copy</a>) when an item is inserted. <a href="#insert">insert</a>() calls the virtual
function <a href="tqptrcollection.html#newItem">TQPtrCollection::newItem</a>() for the item to be inserted.
Inherit a dictionary and reimplement <a href="tqptrcollection.html#newItem">newItem</a>() if you want deep
copies.
<p> When removing a dictionary item, the virtual function
<a href="tqptrcollection.html#deleteItem">TQPtrCollection::deleteItem</a>() is called. TQDict's default
implementation is to delete the item if auto-deletion is enabled.
<p> Example #1:
<pre>
TQDict<TQLineEdit> fields; // TQString keys, TQLineEdit* values
fields.<a href="#insert">insert</a>( "forename", new <a href="tqlineedit.html">TQLineEdit</a>( this ) );
fields.<a href="#insert">insert</a>( "surname", new <a href="tqlineedit.html">TQLineEdit</a>( this ) );
fields["forename"]->setText( "Homer" );
fields["surname"]->setText( "Simpson" );
<a href="tqdictiterator.html">TQDictIterator</a><TQLineEdit> it( fields ); // See TQDictIterator
for( ; it.<a href="tqdictiterator.html#current">current</a>(); ++it )
cout << it.<a href="tqdictiterator.html#currentKey">currentKey</a>() << ": " << it.<a href="tqdictiterator.html#current">current</a>()->text() << endl;
cout << endl;
if ( fields["forename"] && fields["surname"] )
cout << fields["forename"]->text() << " "
<< fields["surname"]->text() << endl; // Prints "Homer Simpson"
fields.<a href="#remove">remove</a>( "forename" ); // Does not delete the line edit
if ( ! fields["forename"] )
cout << "forename is not in the dictionary" << endl;
</pre>
In this example we use a dictionary to keep track of the line
edits we're using. We insert each line edit into the dictionary
with a unique name and then access the line edits via the
dictionary.
<p> Example #2:
<pre>
<a href="tqstringlist.html">TQStringList</a> styleList = TQStyleFactory::styles();
styleList.<a href="tqstringlist.html#sort">sort</a>();
TQDict<int> letterDict( 17, FALSE );
for ( TQStringList::Iterator it = styleList.<a href="tqvaluelist.html#begin">begin</a>(); it != styleList.<a href="tqvaluelist.html#end">end</a>(); ++it ) {
<a href="tqstring.html">TQString</a> styleName = *it;
<a href="tqstring.html">TQString</a> styleAccel = styleName;
if ( letterDict[styleAccel.<a href="tqstring.html#left">left</a>(1)] ) {
for ( uint i = 0; i < styleAccel.<a href="tqstring.html#length">length</a>(); i++ ) {
if ( ! letterDict[styleAccel.<a href="tqstring.html#mid">mid</a>( i, 1 )] ) {
styleAccel = styleAccel.<a href="tqstring.html#insert">insert</a>( i, '&' );
letterDict.<a href="#insert">insert</a>(styleAccel.<a href="tqstring.html#mid">mid</a>( i, 1 ), (const int *)1);
break;
}
}
} else {
styleAccel = "&" + styleAccel;
letterDict.<a href="#insert">insert</a>(styleAccel.<a href="tqstring.html#left">left</a>(1), (const int *)1);
}
(void) new <a href="tqaction.html">TQAction</a>( styleName, TQIconSet(), styleAccel, parent );
}
</pre>
In the example we are using the dictionary to provide fast random
access to the keys, and we don't care what the values are. The
example is used to generate a menu of TQStyles, each with a unique
accelerator key (or no accelerator if there are no unused letters
left).
<p> We first obtain the list of available styles, then sort them so
that the menu items will be ordered alphabetically. Next we create
a dictionary of int pointers. The keys in the dictionary are each
one character long, representing letters that have been used for
accelerators. We iterate through our list of style names. If the
first letter of the style name is in the dictionary, i.e. has been
used, we iterate over all the characters in the style name to see
if we can find a letter that hasn't been used. If we find an
unused letter we put the accelerator ampersand (&) in front of it
and add that letter to the dictionary. If we can't find an unused
letter the style will simply have no accelerator. If the first
letter of the style name is not in the dictionary we use it for
the accelerator and add it to the dictionary. Finally we create a
<a href="tqaction.html">TQAction</a> for each style.
<p> <p>See also <a href="tqdictiterator.html">TQDictIterator</a>, <a href="tqasciidict.html">TQAsciiDict</a>, <a href="tqintdict.html">TQIntDict</a>, <a href="tqptrdict.html">TQPtrDict</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="TQDict"></a>TQDict::TQDict ( int size = 17, bool caseSensitive = TRUE )
</h3>
<p> Constructs a dictionary optimized for less than <em>size</em> entries.
<p> We recommend setting <em>size</em> to a suitably large <a href="primes.html#prime">prime</a> number
(e.g. a prime that's slightly larger than the expected number of
entries). This makes the hash distribution better which will lead
to faster lookup.
<p> If <em>caseSensitive</em> is TRUE (the default), keys which differ only
by case are considered different.
<h3 class=fn><a name="TQDict-2"></a>TQDict::TQDict ( const <a href="tqdict.html">TQDict</a><type> & dict )
</h3>
<p> Constructs a copy of <em>dict</em>.
<p> Each item in <em>dict</em> is inserted into this dictionary. Only the
pointers are copied (shallow copy).
<h3 class=fn><a name="~TQDict"></a>TQDict::~TQDict ()
</h3>
<p> Removes all items from the dictionary and destroys it. If
<a href="tqptrcollection.html#setAutoDelete">setAutoDelete</a>() is TRUE, each value is deleted. All iterators that
access this dictionary will be reset.
<p> <p>See also <a href="tqptrcollection.html#setAutoDelete">setAutoDelete</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="tqptrcollection.html#setAutoDelete">setAutoDelete</a>().
<h3 class=fn>void <a name="clear"></a>TQDict::clear ()<tt> [virtual]</tt>
</h3>
<p> Removes all items from the dictionary.
<p> The removed items are deleted if <a href="tqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled.
<p> All dictionary iterators that operate on the dictionary are reset.
<p> <p>See also <a href="#remove">remove</a>(), <a href="#take">take</a>(), and <a href="tqptrcollection.html#setAutoDelete">setAutoDelete</a>().
<p>Reimplemented from <a href="tqptrcollection.html#clear">TQPtrCollection</a>.
<h3 class=fn>uint <a name="count"></a>TQDict::count () const<tt> [virtual]</tt>
</h3>
<p> Returns the number of items in the dictionary.
<p> <p>See also <a href="#isEmpty">isEmpty</a>().
<p>Reimplemented from <a href="tqptrcollection.html#count">TQPtrCollection</a>.
<h3 class=fn>type * <a name="find"></a>TQDict::find ( const <a href="tqstring.html">TQString</a> & key ) const
</h3>
<p> Returns the item with key <em>key</em>, or 0 if the key does not exist
in the dictionary.
<p> If there are two or more items with equal keys, then the most
recently inserted item will be found.
<p> Equivalent to the [] operator.
<p> <p>See also <a href="#operator[]">operator[]</a>().
<h3 class=fn>void <a name="insert"></a>TQDict::insert ( const <a href="tqstring.html">TQString</a> & key, const type * item )
</h3>
<p> Inserts the key <em>key</em> with value <em>item</em> into the dictionary.
<p> Multiple items can have the same key, in which case only the last
item will be accessible using <a href="#operator[]">operator[]</a>().
<p> <em>item</em> may not be 0.
<p> <p>See also <a href="#replace">replace</a>().
<p>Example: <a href="themes-example.html#x326">themes/themes.cpp</a>.
<h3 class=fn>bool <a name="isEmpty"></a>TQDict::isEmpty () const
</h3>
<p> Returns TRUE if the dictionary is empty, i.e. <a href="#count">count</a>() == 0;
otherwise returns FALSE.
<p> <p>See also <a href="#count">count</a>().
<h3 class=fn><a href="tqdict.html">TQDict</a><type> & <a name="operator-eq"></a>TQDict::operator= ( const <a href="tqdict.html">TQDict</a><type> & dict )
</h3>
<p> Assigns <em>dict</em> to this dictionary and returns a reference to this
dictionary.
<p> This dictionary is first cleared, then each item in <em>dict</em> is
inserted into this dictionary. Only the pointers are copied
(shallow copy), unless <a href="tqptrcollection.html#newItem">newItem</a>() has been reimplemented.
<h3 class=fn>type * <a name="operator[]"></a>TQDict::operator[] ( const <a href="tqstring.html">TQString</a> & key ) const
</h3>
<p> Returns the item with key <em>key</em>, or 0 if the key does not
exist in the dictionary.
<p> If there are two or more items with equal keys, then the most
recently inserted item will be found.
<p> Equivalent to the <a href="#find">find</a>() function.
<p> <p>See also <a href="#find">find</a>().
<h3 class=fn><a href="tqdatastream.html">TQDataStream</a> & <a name="read"></a>TQDict::read ( <a href="tqdatastream.html">TQDataStream</a> & s, <a href="tqptrcollection.html#Item">TQPtrCollection::Item</a> & item )<tt> [virtual protected]</tt>
</h3>
<p> Reads a dictionary 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>TQDict::remove ( const <a href="tqstring.html">TQString</a> & key )
</h3>
<p> Removes the item with <em>key</em> from the dictionary. Returns TRUE if
successful, i.e. if the item is in the dictionary; otherwise
returns FALSE.
<p> If there are two or more items with equal keys, then the last item
that was inserted will be removed.
<p> The removed item is deleted if <a href="tqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled.
<p> All dictionary iterators that refer to the removed item will be
set to point to the next item in the dictionary's traversal order.
<p> <p>See also <a href="#take">take</a>(), <a href="#clear">clear</a>(), and <a href="tqptrcollection.html#setAutoDelete">setAutoDelete</a>().
<h3 class=fn>void <a name="replace"></a>TQDict::replace ( const <a href="tqstring.html">TQString</a> & key, const type * item )
</h3>
<p> Replaces the value of the key, <em>key</em> with <em>item</em>.
<p> If the item does not already exist, it will be inserted.
<p> <em>item</em> may not be 0.
<p> Equivalent to:
<pre>
TQDict<char> dict;
...
if ( dict.<a href="#find">find</a>( key ) )
dict.<a href="#remove">remove</a>( key );
dict.<a href="#insert">insert</a>( key, item );
</pre>
<p> If there are two or more items with equal keys, then the last item
that was inserted will be replaced.
<p> <p>See also <a href="#insert">insert</a>().
<h3 class=fn>void <a name="resize"></a>TQDict::resize ( uint newsize )
</h3>
<p> Changes the size of the hash table to <em>newsize</em>. The contents of
the dictionary are preserved, but all iterators on the dictionary
become invalid.
<h3 class=fn>void <a name="setAutoDelete"></a>TQPtrCollection::setAutoDelete ( bool 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="tqptrcollection.html#autoDelete">autoDelete</a>().
<p>Examples: <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>uint <a name="size"></a>TQDict::size () const
</h3>
<p> Returns the size of the internal hash array (as specified in the
constructor).
<p> <p>See also <a href="#count">count</a>().
<h3 class=fn>void <a name="statistics"></a>TQDict::statistics () const
</h3>
<p> Debugging-only function that prints out the dictionary
distribution using <a href="tqapplication.html#qDebug">tqDebug</a>().
<h3 class=fn>type * <a name="take"></a>TQDict::take ( const <a href="tqstring.html">TQString</a> & key )
</h3>
<p> Takes the item with <em>key</em> out of the dictionary without deleting
it (even if <a href="tqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled).
<p> If there are two or more items with equal keys, then the last item
that was inserted will be taken.
<p> Returns a pointer to the item taken out, or 0 if the key does not
exist in the dictionary.
<p> All dictionary iterators that refer to the taken item will be set
to point to the next item in the dictionary traversal order.
<p> <p>See also <a href="#remove">remove</a>(), <a href="#clear">clear</a>(), and <a href="tqptrcollection.html#setAutoDelete">setAutoDelete</a>().
<h3 class=fn><a href="tqdatastream.html">TQDataStream</a> & <a name="write"></a>TQDict::write ( <a href="tqdatastream.html">TQDataStream</a> & s, <a href="tqptrcollection.html#Item">TQPtrCollection::Item</a> ) const<tt> [virtual protected]</tt>
</h3>
<p> Writes a dictionary item to the stream <em>s</em> and returns a
reference to the stream.
<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 © 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 © 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>
|
