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182 lines
7.5 KiB
182 lines
7.5 KiB
14 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/qptrdict.doc:319 -->
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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>QPtrDictIterator Class</title>
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<style type="text/css"><!--
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--></style>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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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">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>QPtrDictIterator Class Reference</h1>
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<p>The QPtrDictIterator class provides an iterator for QPtrDict collections.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qptrdict-h.html">qptrdict.h</a>></tt>
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<p><a href="qptrdictiterator-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="#QPtrDictIterator"><b>QPtrDictIterator</b></a> ( const QPtrDict<type> & dict )</li>
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<li class=fn><a href="#~QPtrDictIterator"><b>~QPtrDictIterator</b></a> ()</li>
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<li class=fn>uint <a href="#count"><b>count</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>type * <a href="#toFirst"><b>toFirst</b></a> ()</li>
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<li class=fn><a href="#operator-type-*"><b>operator type *</b></a> () const</li>
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<li class=fn>type * <a href="#current"><b>current</b></a> () const</li>
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<li class=fn>void * <a href="#currentKey"><b>currentKey</b></a> () const</li>
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<li class=fn>type * <a href="#operator()"><b>operator()</b></a> ()</li>
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<li class=fn>type * <a href="#operator++"><b>operator++</b></a> ()</li>
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<li class=fn>type * <a href="#operator+-eq"><b>operator+=</b></a> ( uint jump )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QPtrDictIterator class provides an iterator for <a href="qptrdict.html">QPtrDict</a> collections.
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<p>
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<p> QPtrDictIterator is implemented as a template class. Define a
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template instance QPtrDictIterator<X> to create a dictionary
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iterator that operates on QPtrDict<X> (dictionary of X*).
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<p> Example:
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<pre>
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<a href="qptrdict.html">QPtrDict</a><char> fields;
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<a href="qlineedit.html">QLineEdit</a> *le1 = new <a href="qlineedit.html">QLineEdit</a>( this );
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le1-><a href="qlineedit.html#setText">setText</a>( "Simpson" );
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<a href="qlineedit.html">QLineEdit</a> *le2 = new <a href="qlineedit.html">QLineEdit</a>( this );
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le2-><a href="qlineedit.html#setText">setText</a>( "Homer" );
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<a href="qlineedit.html">QLineEdit</a> *le3 = new <a href="qlineedit.html">QLineEdit</a>( this );
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le3-><a href="qlineedit.html#setText">setText</a>( "45" );
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fields.<a href="qptrdict.html#insert">insert</a>( le1, "Surname" );
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fields.<a href="qptrdict.html#insert">insert</a>( le2, "Forename" );
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fields.<a href="qptrdict.html#insert">insert</a>( le3, "Age" );
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QPtrDictIterator<char> it( fields );
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for( ; it.<a href="#current">current</a>(); ++it ) {
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<a href="qlineedit.html">QLineEdit</a> *le = (QLineEdit)it.<a href="#currentKey">currentKey</a>();
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cout << it.<a href="#current">current</a>() << ": " << le-><a href="qlineedit.html#text">text</a>() << endl;
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}
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cout << endl;
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// Output (random order):
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// Forename: Homer
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// Age: 45
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// Surname: Simpson
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</pre>
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In the example we insert some line edits into a dictionary,
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associating a string with each. We then iterate over the
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dictionary printing the associated strings.
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<p> Multiple iterators may independently traverse the same dictionary.
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A <a href="qptrdict.html">QPtrDict</a> knows about all the iterators that are operating on the
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dictionary. When an item is removed from the dictionary, QPtrDict
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updates all iterators that refer the removed item to point to the
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next item in the traversing order.
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<p> <p>See also <a href="qptrdict.html">QPtrDict</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="QPtrDictIterator"></a>QPtrDictIterator::QPtrDictIterator ( const <a href="qptrdict.html">QPtrDict</a><type> & dict )
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</h3>
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<p> Constructs an iterator for <em>dict</em>. The current iterator item is
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set to point on the first item in the <em>dict</em>.
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<h3 class=fn><a name="~QPtrDictIterator"></a>QPtrDictIterator::~QPtrDictIterator ()
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</h3>
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<p> Destroys the iterator.
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<h3 class=fn>uint <a name="count"></a>QPtrDictIterator::count () const
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</h3>
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<p> Returns the number of items in the dictionary this iterator
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operates on.
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<p> <p>See also <a href="#isEmpty">isEmpty</a>().
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<h3 class=fn>type * <a name="current"></a>QPtrDictIterator::current () const
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</h3>
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<p> Returns a pointer to the current iterator item's value.
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<h3 class=fn>void * <a name="currentKey"></a>QPtrDictIterator::currentKey () const
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</h3>
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<p> Returns the current iterator item's key.
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<h3 class=fn>bool <a name="isEmpty"></a>QPtrDictIterator::isEmpty () const
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</h3>
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<p> Returns TRUE if the dictionary is empty; otherwise returns FALSE.
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<p> <p>See also <a href="#count">count</a>().
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<h3 class=fn><a name="operator-type-*"></a>QPtrDictIterator::operator type * () const
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</h3>
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<p> Cast operator. Returns a pointer to the current iterator item.
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Same as <a href="#current">current</a>().
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<h3 class=fn>type * <a name="operator()"></a>QPtrDictIterator::operator() ()
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</h3>
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<p> Makes the succeeding item current and returns the original current
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item.
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<p> If the current iterator item was the last item in the dictionary
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or if it was 0, 0 is returned.
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<h3 class=fn>type * <a name="operator++"></a>QPtrDictIterator::operator++ ()
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</h3>
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<p> Prefix ++ makes the succeeding item current and returns the new
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current item.
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<p> If the current iterator item was the last item in the dictionary
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or if it was 0, 0 is returned.
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<h3 class=fn>type * <a name="operator+-eq"></a>QPtrDictIterator::operator+= ( uint jump )
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</h3>
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<p> Sets the current item to the item <em>jump</em> positions after the
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current item and returns a pointer to that item.
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<p> If that item is beyond the last item or if the dictionary is
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empty, it sets the current item to 0 and returns 0.
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<h3 class=fn>type * <a name="toFirst"></a>QPtrDictIterator::toFirst ()
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</h3>
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<p> Sets the current iterator item to point to the first item in the
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dictionary and returns a pointer to the item. If the dictionary is
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empty, it sets the current item to 0 and returns 0.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">Qt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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