<?xml version="1.0" encoding="iso-8859-1"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <!-- /tmp/qt-4.3.4-qt-1203442408707/qt-x11-opensource-src-4.3.4/doc/src/q3dict.qdoc --> <head> <title>Qt 4.3: Q3DictIterator Class Reference</title> <link href="classic.css" rel="stylesheet" type="text/css" /> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td align="left" valign="top" width="32"><a href="http://www.trolltech.com/products/qt"><img src="images/qt-logo.png" align="left" width="32" height="32" border="0" /></a></td> <td width="1"> </td><td class="postheader" 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="groups.html"><font color="#004faf">Grouped Classes</font></a> · <a href="modules.html"><font color="#004faf">Modules</font></a> · <a href="functions.html"><font color="#004faf">Functions</font></a></td> <td align="right" valign="top" width="230"><a href="http://www.trolltech.com"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></a></td></tr></table><h1 align="center">Q3DictIterator Class Reference<br /><sup><sup>[<a href="qt3support.html">Qt3Support</a> module]</sup></sup></h1> <p>The Q3DictIterator class provides an iterator for <a href="q3dict.html">Q3Dict</a> collections. <a href="#details">More...</a></p> <pre> #include <Q3DictIterator></pre><p><b>This class is part of the Qt 3 support library.</b> It is provided to keep old source code working. We strongly advise against using it in new code. See <a href="porting4.html">Porting to Qt 4</a> for more information.</p> <ul> <li><a href="q3dictiterator-members.html">List of all members, including inherited members</a></li> </ul> <a name="public-functions"></a> <h3>Public Functions</h3> <ul> <li><div class="fn"/><b><a href="q3dictiterator.html#Q3DictIterator">Q3DictIterator</a></b> ( const Q3Dict<type> & <i>dict</i> )</li> <li><div class="fn"/><b><a href="q3dictiterator.html#dtor.Q3DictIterator">~Q3DictIterator</a></b> ()</li> <li><div class="fn"/>uint <b><a href="q3dictiterator.html#count">count</a></b> () const</li> <li><div class="fn"/>type * <b><a href="q3dictiterator.html#current">current</a></b> () const</li> <li><div class="fn"/>QString <b><a href="q3dictiterator.html#currentKey">currentKey</a></b> () const</li> <li><div class="fn"/>bool <b><a href="q3dictiterator.html#isEmpty">isEmpty</a></b> () const</li> <li><div class="fn"/>type * <b><a href="q3dictiterator.html#toFirst">toFirst</a></b> ()</li> <li><div class="fn"/><b><a href="q3dictiterator.html#operator-type--2a">operator type *</a></b> () const</li> <li><div class="fn"/>type * <b><a href="q3dictiterator.html#operator-28-29">operator()</a></b> ()</li> <li><div class="fn"/>type * <b><a href="q3dictiterator.html#operator-2b-2b">operator++</a></b> ()</li> </ul> <a name="details"></a> <hr /> <h2>Detailed Description</h2> <p>The Q3DictIterator class provides an iterator for <a href="q3dict.html">Q3Dict</a> collections.</p> <p>Q3DictIterator is implemented as a template class. Define a template instance Q3DictIterator<X> to create a dictionary iterator that operates on <a href="q3dict.html">Q3Dict</a><X> (dictionary of X*).</p> <p>The traversal order is arbitrary; when we speak of the "first", "last" and "next" item we are talking in terms of this arbitrary order.</p> <p>Multiple iterators may independently traverse the same dictionary. A <a href="q3dict.html">Q3Dict</a> knows about all the iterators that are operating on the dictionary. When an item is removed from the dictionary, <a href="q3dict.html">Q3Dict</a> updates all iterators that are referring to the removed item to point to the next item in the (arbitrary) traversal order.</p> <p>Example:</p> <pre> Q3Dict<QLineEdit> fields; fields.insert( "forename", new QLineEdit( this ) ); fields.insert( "surname", new QLineEdit( this ) ); fields.insert( "age", new QLineEdit( this ) ); fields["forename"]->setText( "Homer" ); fields["surname"]->setText( "Simpson" ); fields["age"]->setText( "45" ); Q3DictIterator<QLineEdit> it( fields ); for( ; it.current(); ++it ) cout << it.currentKey() << ": " << it.current()->text() << endl; cout << endl; <span class="comment"> //</span> Output (random order): <span class="comment"> //</span> age: 45 <span class="comment"> //</span> surname: Simpson <span class="comment"> //</span> forename: Homer</pre> <p>In the example we insert some pointers to line edits into a dictionary, then iterate over the dictionary printing the strings associated with the line edits.</p> <p>See also <a href="q3dict.html">Q3Dict</a>.</p> <hr /> <h2>Member Function Documentation</h2> <h3 class="fn"><a name="Q3DictIterator"></a>Q3DictIterator::Q3DictIterator ( const <a href="q3dict.html">Q3Dict</a><type> & <i>dict</i> )</h3> <p>Constructs an iterator for <i>dict</i>. The current iterator item is set to point to the first item in the dictionary, <i>dict</i>. First in this context means first in the arbitrary traversal order.</p> <h3 class="fn"><a name="dtor.Q3DictIterator"></a>Q3DictIterator::~Q3DictIterator ()</h3> <p>Destroys the iterator.</p> <h3 class="fn"><a name="count"></a><a href="qtglobal.html#uint-typedef">uint</a> Q3DictIterator::count () const</h3> <p>Returns the number of items in the dictionary over which the iterator is operating.</p> <p>See also <a href="q3dictiterator.html#isEmpty">isEmpty</a>().</p> <h3 class="fn"><a name="current"></a>type * Q3DictIterator::current () const</h3> <p>Returns a pointer to the current iterator item's value.</p> <h3 class="fn"><a name="currentKey"></a><a href="qstring.html">QString</a> Q3DictIterator::currentKey () const</h3> <p>Returns the current iterator item's key.</p> <h3 class="fn"><a name="isEmpty"></a>bool Q3DictIterator::isEmpty () const</h3> <p>Returns TRUE if the dictionary is empty, i.e. <a href="q3dictiterator.html#count">count</a>() == 0; otherwise returns FALSE.</p> <p>See also <a href="q3dictiterator.html#count">count</a>().</p> <h3 class="fn"><a name="toFirst"></a>type * Q3DictIterator::toFirst ()</h3> <p>Resets the iterator, making the first item the first current item. First in this context means first in the arbitrary traversal order. Returns a pointer to this item.</p> <p>If the dictionary is empty it sets the current item to 0 and returns 0.</p> <h3 class="fn"><a name="operator-type--2a"></a>Q3DictIterator::operator type * () const</h3> <p>Cast operator. Returns a pointer to the current iterator item. Same as <a href="q3dictiterator.html#current">current</a>().</p> <h3 class="fn"><a name="operator-28-29"></a>type * Q3DictIterator::operator() ()</h3> <p>Makes the next item current and returns the original current item.</p> <p>If the current iterator item was the last item in the dictionary or if it was 0, 0 is returned.</p> <h3 class="fn"><a name="operator-2b-2b"></a>type * Q3DictIterator::operator++ ()</h3> <p>Prefix ++ makes the next item current and returns the new current item.</p> <p>If the current iterator item was the last item in the dictionary or if it was 0, 0 is returned.</p> <p /><address><hr /><div align="center"> <table width="100%" cellspacing="0" border="0"><tr class="address"> <td width="30%">Copyright © 2008 <a href="trolltech.html">Trolltech</a></td> <td width="40%" align="center"><a href="trademarks.html">Trademarks</a></td> <td width="30%" align="right"><div align="right">Qt 4.3.4</div></td> </tr></table></div></address></body> </html>