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180 lines
7.5 KiB
180 lines
7.5 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/qasciidict.doc:337 -->
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>TQAsciiDictIterator Class</title>
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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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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQAsciiDictIterator Class Reference</h1>
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<p>The TQAsciiDictIterator class provides an iterator for TQAsciiDict collections.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qasciidict-h.html">qasciidict.h</a>></tt>
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<p><a href="qasciidictiterator-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="#TQAsciiDictIterator"><b>TQAsciiDictIterator</b></a> ( const TQAsciiDict<type> & dict )</li>
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<li class=fn><a href="#~TQAsciiDictIterator"><b>~TQAsciiDictIterator</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>const char * <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 TQAsciiDictIterator class provides an iterator for <a href="qasciidict.html">TQAsciiDict</a> collections.
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<p>
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<p> TQAsciiDictIterator is implemented as a template class. Define a
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template instance TQAsciiDictIterator<X> to create a dictionary
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iterator that operates on TQAsciiDict<X> (dictionary of X*).
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<p> Example:
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<pre>
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<a href="qasciidict.html">TQAsciiDict</a><TQLineEdit> fields;
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fields.<a href="qasciidict.html#insert">insert</a>( "forename", new <a href="qlineedit.html">TQLineEdit</a>( this ) );
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fields.<a href="qasciidict.html#insert">insert</a>( "surname", new <a href="qlineedit.html">TQLineEdit</a>( this ) );
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fields.<a href="qasciidict.html#insert">insert</a>( "age", new <a href="qlineedit.html">TQLineEdit</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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TQAsciiDictIterator<TQLineEdit> 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 line edits into a dictionary, then
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iterate over the dictionary printing the strings associated with
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those line edits.
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<p> Note that the traversal order is arbitrary; you are not guaranteed
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any particular order.
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<p> Multiple iterators may independently traverse the same dictionary.
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A <a href="qasciidict.html">TQAsciiDict</a> knows about all the iterators that are operating on
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the dictionary. When an item is removed from the dictionary,
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TQAsciiDict updates all the iterators that are referring to the
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removed item to point to the next item in the (arbitrary)
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traversal order.
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<p> <p>See also <a href="qasciidict.html">TQAsciiDict</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="TQAsciiDictIterator"></a>TQAsciiDictIterator::TQAsciiDictIterator ( const <a href="qasciidict.html">TQAsciiDict</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="~TQAsciiDictIterator"></a>TQAsciiDictIterator::~TQAsciiDictIterator ()
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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>TQAsciiDictIterator::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 over.
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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>TQAsciiDictIterator::current () const
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</h3>
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<p> Returns a pointer to the current iterator item.
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<h3 class=fn>const char * <a name="currentKey"></a>TQAsciiDictIterator::currentKey () const
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</h3>
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<p> Returns a pointer to the key for the current iterator item.
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<h3 class=fn>bool <a name="isEmpty"></a>TQAsciiDictIterator::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>TQAsciiDictIterator::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>TQAsciiDictIterator::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>TQAsciiDictIterator::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>TQAsciiDictIterator::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>TQAsciiDictIterator::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">TQt 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>TQt 3.3.8</div>
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</table></div></address></body>
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</html>
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