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173 lines
7.0 KiB
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<title>QDictIterator Class</title>
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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>QDictIterator Class Reference</h1>
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<p>The QDictIterator class provides an iterator for QDict collections.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qdict-h.html">qdict.h</a>></tt>
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<p><a href="qdictiterator-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="#QDictIterator"><b>QDictIterator</b></a> ( const QDict<type> & dict )</li>
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<li class=fn><a href="#~QDictIterator"><b>~QDictIterator</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>QString <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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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QDictIterator class provides an iterator for <a href="qdict.html">QDict</a> collections.
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<p>
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<p> QDictIterator is implemented as a template class. Define a
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template instance QDictIterator<X> to create a dictionary
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iterator that operates on QDict<X> (dictionary of X*).
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<p> The traversal order is arbitrary; when we speak of the "first",
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"last" and "next" item we are talking in terms of this arbitrary
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order.
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<p> Multiple iterators may independently traverse the same dictionary.
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A QDict knows about all the iterators that are operating on the
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dictionary. When an item is removed from the dictionary, QDict
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updates all iterators that are referring to the removed item to
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point to the next item in the (arbitrary) traversal order.
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<p> Example:
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<pre>
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<a href="qdict.html">QDict</a><QLineEdit> fields;
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fields.<a href="qdict.html#insert">insert</a>( "forename", new <a href="qlineedit.html">QLineEdit</a>( this ) );
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fields.<a href="qdict.html#insert">insert</a>( "surname", new <a href="qlineedit.html">QLineEdit</a>( this ) );
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fields.<a href="qdict.html#insert">insert</a>( "age", new <a href="qlineedit.html">QLineEdit</a>( this ) );
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fields["forename"]->setText( "Homer" );
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fields["surname"]->setText( "Simpson" );
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fields["age"]->setText( "45" );
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QDictIterator<QLineEdit> it( fields );
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for( ; it.<a href="#current">current</a>(); ++it )
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cout << it.<a href="#currentKey">currentKey</a>() << ": " << it.<a href="#current">current</a>()->text() << endl;
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cout << endl;
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// Output (random order):
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// age: 45
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// surname: Simpson
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// forename: Homer
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</pre>
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In the example we insert some pointers to line edits into a
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dictionary, then iterate over the dictionary printing the strings
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associated with the line edits.
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<p> <p>See also <a href="qdict.html">QDict</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="QDictIterator"></a>QDictIterator::QDictIterator ( const <a href="qdict.html">QDict</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 to the first item in the dictionary, <em>dict</em>. First
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in this context means first in the arbitrary traversal order.
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<h3 class=fn><a name="~QDictIterator"></a>QDictIterator::~QDictIterator ()
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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>QDictIterator::count () const
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</h3>
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<p> Returns the number of items in the dictionary over which the
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iterator is operating.
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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>QDictIterator::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><a href="qstring.html">QString</a> <a name="currentKey"></a>QDictIterator::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>QDictIterator::isEmpty () const
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</h3>
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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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<h3 class=fn><a name="operator-type-*"></a>QDictIterator::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>QDictIterator::operator() ()
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</h3>
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<p> Makes the next item current and returns the original 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++"></a>QDictIterator::operator++ ()
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</h3>
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<p> Prefix ++ makes the next item current and returns the new 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="toFirst"></a>QDictIterator::toFirst ()
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</h3>
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<p> Resets the iterator, making the first item the first current item.
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First in this context means first in the arbitrary traversal
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order. Returns a pointer to this item.
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<p> If the dictionary is empty it sets the current item to 0 and
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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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