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400 lines
21 KiB
400 lines
21 KiB
13 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/qdict.doc:41 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>TQDict Class</title>
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Main Classes</font></a>
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<font color="#004faf">Annotated</font></a>
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<font color="#004faf">Grouped Classes</font></a>
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<font color="#004faf">Functions</font></a>
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</td>
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<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>
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<p>The TQDict class is a template class that provides a
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dictionary based on TQString keys.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qdict-h.html">ntqdict.h</a>></tt>
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<p>Inherits <a href="ntqptrcollection.html">TQPtrCollection</a>.
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<p><a href="qdict-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#TQDict"><b>TQDict</b></a> ( int size = 17, bool caseSensitive = TRUE )</li>
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<li class=fn><a href="#TQDict-2"><b>TQDict</b></a> ( const TQDict<type> & dict )</li>
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<li class=fn><a href="#~TQDict"><b>~TQDict</b></a> ()</li>
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<li class=fn>TQDict<type> & <a href="#operator-eq"><b>operator=</b></a> ( const TQDict<type> & dict )</li>
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<li class=fn>virtual uint <a href="#count"><b>count</b></a> () const</li>
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<li class=fn>uint <a href="#size"><b>size</b></a> () const</li>
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<li class=fn>bool <a href="#isEmpty"><b>isEmpty</b></a> () const</li>
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<li class=fn>void <a href="#insert"><b>insert</b></a> ( const TQString & key, const type * item )</li>
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<li class=fn>void <a href="#replace"><b>replace</b></a> ( const TQString & key, const type * item )</li>
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<li class=fn>bool <a href="#remove"><b>remove</b></a> ( const TQString & key )</li>
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<li class=fn>type * <a href="#take"><b>take</b></a> ( const TQString & key )</li>
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<li class=fn>type * <a href="#find"><b>find</b></a> ( const TQString & key ) const</li>
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<li class=fn>type * <a href="#operator[]"><b>operator[]</b></a> ( const TQString & key ) const</li>
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<li class=fn>virtual void <a href="#clear"><b>clear</b></a> ()</li>
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<li class=fn>void <a href="#resize"><b>resize</b></a> ( uint newsize )</li>
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<li class=fn>void <a href="#statistics"><b>statistics</b></a> () const</li>
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</ul>
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<h2>Important Inherited Members</h2>
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<ul>
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<li class=fn>bool <a href="#autoDelete"><b>autoDelete</b></a> () const</li>
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<li class=fn>void <a href="#setAutoDelete"><b>setAutoDelete</b></a> ( bool enable )</li>
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</ul>
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<h2>Protected Members</h2>
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<ul>
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<li class=fn>virtual TQDataStream & <a href="#read"><b>read</b></a> ( TQDataStream & s, TQPtrCollection::Item & item )</li>
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<li class=fn>virtual TQDataStream & <a href="#write"><b>write</b></a> ( TQDataStream & s, TQPtrCollection::Item ) const</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQDict class is a template class that provides a
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dictionary based on <a href="ntqstring.html">TQString</a> keys.
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<p>
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<p>
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<p> <a href="ntqmap.html">TQMap</a> is an STL-compatible alternative to this class.
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<p> TQDict is implemented as a template class. Define a template
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instance TQDict<X> to create a dictionary that operates on
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pointers to X (X *).
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<p> A dictionary is a collection of key-value pairs. The key is a
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TQString used for insertion, removal and lookup. The value is a
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pointer. Dictionaries provide very fast insertion and lookup.
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<p> If you want to use non-Unicode, plain 8-bit <tt>char*</tt> keys, use the
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<a href="ntqasciidict.html">TQAsciiDict</a> template. A TQDict has the same performance as a
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TQAsciiDict. If you want to have a dictionary that maps TQStrings to
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TQStrings use TQMap.
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<p> The <a href="#size">size</a>() of the dictionary is very important. In order to get
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good performance, you should use a suitably large <a href="primes.html#prime">prime</a> number.
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Suitable means equal to or larger than the maximum expected number
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of dictionary items. Size is set in the constructor but may be
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changed with <a href="#resize">resize</a>().
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<p> Items are inserted with <a href="#insert">insert</a>(); 0 pointers cannot be inserted.
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Items are removed with <a href="#remove">remove</a>(). All the items in a dictionary can
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be removed with <a href="#clear">clear</a>(). The number of items in the dictionary is
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returned by <a href="#count">count</a>(). If the dictionary contains no items <a href="#isEmpty">isEmpty</a>()
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returns TRUE. You can change an item's value with <a href="#replace">replace</a>(). Items
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are looked up with <a href="#operator[]">operator[]</a>(), or with <a href="#find">find</a>() which return a
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pointer to the value or 0 if the given key does not exist. You can
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take an item out of the dictionary with <a href="#take">take</a>().
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<p> Calling <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>(TRUE) for a dictionary tells it to delete
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items that are removed. The default behaviour is not to delete
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items when they are removed.
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<p> When an item is inserted, the key is converted (hashed) to an
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integer index into an internal hash array. This makes lookup very
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fast.
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<p> Items with equal keys are allowed. When inserting two items with
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the same key, only the last inserted item will be accessible (last
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in, first out) until it is removed.
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<p> The <a href="qdictiterator.html">TQDictIterator</a> class can traverse the dictionary, but only in
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an arbitrary order. Multiple iterators may independently traverse
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the same dictionary.
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<p> When inserting an item into a dictionary, only the pointer is
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copied, not the item itself, i.e. a <a href="shclass.html#shallow-copy">shallow copy</a> is made. It is
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possible to make the dictionary copy all of the item's data (a
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<a href="shclass.html#deep-copy">deep copy</a>) when an item is inserted. <a href="#insert">insert</a>() calls the virtual
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function <a href="ntqptrcollection.html#newItem">TQPtrCollection::newItem</a>() for the item to be inserted.
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Inherit a dictionary and reimplement <a href="ntqptrcollection.html#newItem">newItem</a>() if you want deep
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copies.
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<p> When removing a dictionary item, the virtual function
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<a href="ntqptrcollection.html#deleteItem">TQPtrCollection::deleteItem</a>() is called. TQDict's default
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implementation is to delete the item if auto-deletion is enabled.
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<p> Example #1:
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<pre>
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TQDict<TQLineEdit> fields; // TQString keys, TQLineEdit* values
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fields.<a href="#insert">insert</a>( "forename", new <a href="ntqlineedit.html">TQLineEdit</a>( this ) );
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fields.<a href="#insert">insert</a>( "surname", new <a href="ntqlineedit.html">TQLineEdit</a>( this ) );
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fields["forename"]->setText( "Homer" );
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fields["surname"]->setText( "Simpson" );
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<a href="qdictiterator.html">TQDictIterator</a><TQLineEdit> it( fields ); // See TQDictIterator
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for( ; it.<a href="qdictiterator.html#current">current</a>(); ++it )
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cout << it.<a href="qdictiterator.html#currentKey">currentKey</a>() << ": " << it.<a href="qdictiterator.html#current">current</a>()->text() << endl;
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cout << endl;
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if ( fields["forename"] && fields["surname"] )
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cout << fields["forename"]->text() << " "
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<< fields["surname"]->text() << endl; // Prints "Homer Simpson"
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fields.<a href="#remove">remove</a>( "forename" ); // Does not delete the line edit
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if ( ! fields["forename"] )
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cout << "forename is not in the dictionary" << endl;
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</pre>
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In this example we use a dictionary to keep track of the line
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edits we're using. We insert each line edit into the dictionary
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with a unique name and then access the line edits via the
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dictionary.
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<p> Example #2:
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<pre>
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<a href="ntqstringlist.html">TQStringList</a> styleList = TQStyleFactory::styles();
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styleList.<a href="ntqstringlist.html#sort">sort</a>();
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TQDict<int> letterDict( 17, FALSE );
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for ( TQStringList::Iterator it = styleList.<a href="ntqvaluelist.html#begin">begin</a>(); it != styleList.<a href="ntqvaluelist.html#end">end</a>(); ++it ) {
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<a href="ntqstring.html">TQString</a> styleName = *it;
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<a href="ntqstring.html">TQString</a> styleAccel = styleName;
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if ( letterDict[styleAccel.<a href="ntqstring.html#left">left</a>(1)] ) {
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for ( uint i = 0; i < styleAccel.<a href="ntqstring.html#length">length</a>(); i++ ) {
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if ( ! letterDict[styleAccel.<a href="ntqstring.html#mid">mid</a>( i, 1 )] ) {
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styleAccel = styleAccel.<a href="ntqstring.html#insert">insert</a>( i, '&' );
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letterDict.<a href="#insert">insert</a>(styleAccel.<a href="ntqstring.html#mid">mid</a>( i, 1 ), (const int *)1);
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break;
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}
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}
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} else {
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styleAccel = "&" + styleAccel;
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letterDict.<a href="#insert">insert</a>(styleAccel.<a href="ntqstring.html#left">left</a>(1), (const int *)1);
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}
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(void) new <a href="ntqaction.html">TQAction</a>( styleName, TQIconSet(), styleAccel, parent );
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}
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</pre>
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In the example we are using the dictionary to provide fast random
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access to the keys, and we don't care what the values are. The
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example is used to generate a menu of TQStyles, each with a unique
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accelerator key (or no accelerator if there are no unused letters
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left).
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<p> We first obtain the list of available styles, then sort them so
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that the menu items will be ordered alphabetically. Next we create
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a dictionary of int pointers. The keys in the dictionary are each
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one character long, representing letters that have been used for
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accelerators. We iterate through our list of style names. If the
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first letter of the style name is in the dictionary, i.e. has been
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used, we iterate over all the characters in the style name to see
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if we can find a letter that hasn't been used. If we find an
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unused letter we put the accelerator ampersand (&) in front of it
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and add that letter to the dictionary. If we can't find an unused
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letter the style will simply have no accelerator. If the first
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letter of the style name is not in the dictionary we use it for
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the accelerator and add it to the dictionary. Finally we create a
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<a href="ntqaction.html">TQAction</a> for each style.
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<p> <p>See also <a href="qdictiterator.html">TQDictIterator</a>, <a href="ntqasciidict.html">TQAsciiDict</a>, <a href="ntqintdict.html">TQIntDict</a>, <a href="ntqptrdict.html">TQPtrDict</a>, <a href="collection.html">Collection Classes</a>, and <a href="tools.html">Non-GUI Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQDict"></a>TQDict::TQDict ( int size = 17, bool caseSensitive = TRUE )
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</h3>
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<p> Constructs a dictionary optimized for less than <em>size</em> entries.
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<p> We recommend setting <em>size</em> to a suitably large <a href="primes.html#prime">prime</a> number
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(e.g. a prime that's slightly larger than the expected number of
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entries). This makes the hash distribution better which will lead
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to faster lookup.
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<p> If <em>caseSensitive</em> is TRUE (the default), keys which differ only
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by case are considered different.
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<h3 class=fn><a name="TQDict-2"></a>TQDict::TQDict ( const <a href="ntqdict.html">TQDict</a><type> & dict )
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</h3>
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<p> Constructs a copy of <em>dict</em>.
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<p> Each item in <em>dict</em> is inserted into this dictionary. Only the
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pointers are copied (shallow copy).
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<h3 class=fn><a name="~TQDict"></a>TQDict::~TQDict ()
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</h3>
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<p> Removes all items from the dictionary and destroys it. If
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<a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>() is TRUE, each value is deleted. All iterators that
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access this dictionary will be reset.
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<p> <p>See also <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>().
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<h3 class=fn>bool <a name="autoDelete"></a>TQPtrCollection::autoDelete () const
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</h3>
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<p> Returns the setting of the auto-delete option. The default is FALSE.
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<p> <p>See also <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>().
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<h3 class=fn>void <a name="clear"></a>TQDict::clear ()<tt> [virtual]</tt>
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</h3>
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<p> Removes all items from the dictionary.
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<p> The removed items are deleted if <a href="ntqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled.
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<p> All dictionary iterators that operate on the dictionary are reset.
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<p> <p>See also <a href="#remove">remove</a>(), <a href="#take">take</a>(), and <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>().
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<p>Reimplemented from <a href="ntqptrcollection.html#clear">TQPtrCollection</a>.
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<h3 class=fn>uint <a name="count"></a>TQDict::count () const<tt> [virtual]</tt>
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</h3>
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<p> Returns the number of items in the dictionary.
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<p> <p>See also <a href="#isEmpty">isEmpty</a>().
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<p>Reimplemented from <a href="ntqptrcollection.html#count">TQPtrCollection</a>.
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<h3 class=fn>type * <a name="find"></a>TQDict::find ( const <a href="ntqstring.html">TQString</a> & key ) const
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</h3>
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<p> Returns the item with key <em>key</em>, or 0 if the key does not exist
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in the dictionary.
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<p> If there are two or more items with equal keys, then the most
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recently inserted item will be found.
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<p> Equivalent to the [] operator.
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<p> <p>See also <a href="#operator[]">operator[]</a>().
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<h3 class=fn>void <a name="insert"></a>TQDict::insert ( const <a href="ntqstring.html">TQString</a> & key, const type * item )
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</h3>
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<p> Inserts the key <em>key</em> with value <em>item</em> into the dictionary.
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<p> Multiple items can have the same key, in which case only the last
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item will be accessible using <a href="#operator[]">operator[]</a>().
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||
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<p> <em>item</em> may not be 0.
|
||
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<p> <p>See also <a href="#replace">replace</a>().
|
||
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|
||
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<p>Example: <a href="themes-example.html#x326">themes/themes.cpp</a>.
|
||
|
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<h3 class=fn>bool <a name="isEmpty"></a>TQDict::isEmpty () const
|
||
|
|
</h3>
|
||
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|
||
|
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<p> Returns TRUE if the dictionary is empty, i.e. <a href="#count">count</a>() == 0;
|
||
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|
otherwise returns FALSE.
|
||
|
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<p> <p>See also <a href="#count">count</a>().
|
||
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||
|
13 years ago
|
<h3 class=fn><a href="ntqdict.html">TQDict</a><type> & <a name="operator-eq"></a>TQDict::operator= ( const <a href="ntqdict.html">TQDict</a><type> & dict )
|
||
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13 years ago
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</h3>
|
||
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|
|
||
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<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
|
||
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|
inserted into this dictionary. Only the pointers are copied
|
||
|
13 years ago
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(shallow copy), unless <a href="ntqptrcollection.html#newItem">newItem</a>() has been reimplemented.
|
||
|
13 years ago
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|
||
|
13 years ago
|
<h3 class=fn>type * <a name="operator[]"></a>TQDict::operator[] ( const <a href="ntqstring.html">TQString</a> & key ) const
|
||
|
13 years ago
|
</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>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn><a href="ntqdatastream.html">TQDataStream</a> & <a name="read"></a>TQDict::read ( <a href="ntqdatastream.html">TQDataStream</a> & s, <a href="ntqptrcollection.html#Item">TQPtrCollection::Item</a> & item )<tt> [virtual protected]</tt>
|
||
|
13 years ago
|
</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>().
|
||
|
|
|
||
|
13 years ago
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<h3 class=fn>bool <a name="remove"></a>TQDict::remove ( const <a href="ntqstring.html">TQString</a> & key )
|
||
|
13 years ago
|
</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.
|
||
|
13 years ago
|
<p> The removed item is deleted if <a href="ntqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled.
|
||
|
13 years ago
|
<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.
|
||
|
13 years ago
|
<p> <p>See also <a href="#take">take</a>(), <a href="#clear">clear</a>(), and <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>().
|
||
|
13 years ago
|
|
||
|
13 years ago
|
<h3 class=fn>void <a name="replace"></a>TQDict::replace ( const <a href="ntqstring.html">TQString</a> & key, const type * item )
|
||
|
13 years ago
|
</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.
|
||
|
13 years ago
|
<p> <p>See also <a href="ntqptrcollection.html#autoDelete">autoDelete</a>().
|
||
|
13 years ago
|
|
||
|
|
<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>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
|
||
|
13 years ago
|
distribution using <a href="ntqapplication.html#qDebug">qDebug</a>().
|
||
|
13 years ago
|
|
||
|
13 years ago
|
<h3 class=fn>type * <a name="take"></a>TQDict::take ( const <a href="ntqstring.html">TQString</a> & key )
|
||
|
13 years ago
|
</h3>
|
||
|
|
|
||
|
|
<p> Takes the item with <em>key</em> out of the dictionary without deleting
|
||
|
13 years ago
|
it (even if <a href="ntqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled).
|
||
|
13 years ago
|
<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.
|
||
|
13 years ago
|
<p> <p>See also <a href="#remove">remove</a>(), <a href="#clear">clear</a>(), and <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>().
|
||
|
13 years ago
|
|
||
|
13 years ago
|
<h3 class=fn><a href="ntqdatastream.html">TQDataStream</a> & <a name="write"></a>TQDict::write ( <a href="ntqdatastream.html">TQDataStream</a> & s, <a href="ntqptrcollection.html#Item">TQPtrCollection::Item</a> ) const<tt> [virtual protected]</tt>
|
||
|
13 years ago
|
</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>
|