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182 lines
7.6 KiB
182 lines
7.6 KiB
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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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<title>TQPtrDictIterator 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>TQPtrDictIterator Class Reference</h1>
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<p>The TQPtrDictIterator class provides an iterator for TQPtrDict collections.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qptrdict-h.html">ntqptrdict.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="#TQPtrDictIterator"><b>TQPtrDictIterator</b></a> ( const TQPtrDict<type> & dict )</li>
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<li class=fn><a href="#~TQPtrDictIterator"><b>~TQPtrDictIterator</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 TQPtrDictIterator class provides an iterator for <a href="ntqptrdict.html">TQPtrDict</a> collections.
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<p>
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<p> TQPtrDictIterator is implemented as a template class. Define a
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template instance TQPtrDictIterator<X> to create a dictionary
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iterator that operates on TQPtrDict<X> (dictionary of X*).
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<p> Example:
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<pre>
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<a href="ntqptrdict.html">TQPtrDict</a><char> fields;
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<a href="ntqlineedit.html">TQLineEdit</a> *le1 = new <a href="ntqlineedit.html">TQLineEdit</a>( this );
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le1-><a href="ntqlineedit.html#setText">setText</a>( "Simpson" );
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<a href="ntqlineedit.html">TQLineEdit</a> *le2 = new <a href="ntqlineedit.html">TQLineEdit</a>( this );
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le2-><a href="ntqlineedit.html#setText">setText</a>( "Homer" );
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<a href="ntqlineedit.html">TQLineEdit</a> *le3 = new <a href="ntqlineedit.html">TQLineEdit</a>( this );
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le3-><a href="ntqlineedit.html#setText">setText</a>( "45" );
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fields.<a href="ntqptrdict.html#insert">insert</a>( le1, "Surname" );
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fields.<a href="ntqptrdict.html#insert">insert</a>( le2, "Forename" );
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fields.<a href="ntqptrdict.html#insert">insert</a>( le3, "Age" );
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TQPtrDictIterator<char> it( fields );
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for( ; it.<a href="#current">current</a>(); ++it ) {
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<a href="ntqlineedit.html">TQLineEdit</a> *le = (TQLineEdit)it.<a href="#currentKey">currentKey</a>();
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cout << it.<a href="#current">current</a>() << ": " << le-><a href="ntqlineedit.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="ntqptrdict.html">TQPtrDict</a> knows about all the iterators that are operating on the
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dictionary. When an item is removed from the dictionary, TQPtrDict
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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="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="TQPtrDictIterator"></a>TQPtrDictIterator::TQPtrDictIterator ( const <a href="ntqptrdict.html">TQPtrDict</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="~TQPtrDictIterator"></a>TQPtrDictIterator::~TQPtrDictIterator ()
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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>TQPtrDictIterator::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>TQPtrDictIterator::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>TQPtrDictIterator::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>TQPtrDictIterator::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>TQPtrDictIterator::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>TQPtrDictIterator::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>TQPtrDictIterator::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>TQPtrDictIterator::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>TQPtrDictIterator::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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<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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<td align=right><div align=right>TQt 3.3.8</div>
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