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217 lines
9.9 KiB
217 lines
9.9 KiB
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<title>QPtrQueue 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>QPtrQueue Class Reference</h1>
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<p>The QPtrQueue class is a template class that provides a queue.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qptrqueue-h.html">qptrqueue.h</a>></tt>
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<p><a href="qptrqueue-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="#QPtrQueue"><b>QPtrQueue</b></a> ()</li>
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<li class=fn><a href="#QPtrQueue-2"><b>QPtrQueue</b></a> ( const QPtrQueue<type> & queue )</li>
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<li class=fn><a href="#~QPtrQueue"><b>~QPtrQueue</b></a> ()</li>
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<li class=fn>QPtrQueue<type> & <a href="#operator-eq"><b>operator=</b></a> ( const QPtrQueue<type> & queue )</li>
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<li class=fn>bool <a href="#autoDelete"><b>autoDelete</b></a> () const</li>
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<li class=fn>void <a href="#setAutoDelete"><b>setAutoDelete</b></a> ( bool enable )</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>void <a href="#enqueue"><b>enqueue</b></a> ( const type * d )</li>
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<li class=fn>type * <a href="#dequeue"><b>dequeue</b></a> ()</li>
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<li class=fn>bool <a href="#remove"><b>remove</b></a> ()</li>
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<li class=fn>void <a href="#clear"><b>clear</b></a> ()</li>
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<li class=fn>type * <a href="#head"><b>head</b></a> () const</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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</ul>
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<h2>Protected Members</h2>
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<ul>
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<li class=fn>virtual QDataStream & <a href="#read"><b>read</b></a> ( QDataStream & s, QPtrCollection::Item & item )</li>
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<li class=fn>virtual QDataStream & <a href="#write"><b>write</b></a> ( QDataStream & s, QPtrCollection::Item item ) const</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QPtrQueue class is a template class that provides a queue.
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<p>
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<p> <a href="qvaluevector.html">QValueVector</a> can be used as an STL-compatible alternative to this
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class.
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<p> A template instance QPtrQueue<X> is a queue that operates on
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pointers to X (X*).
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<p> A queue is a first in, first out structure. Items are added to the
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tail of the queue with <a href="#enqueue">enqueue</a>() and retrieved from the head with
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<a href="#dequeue">dequeue</a>(). You can peek at the head item without dequeing it using
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<a href="#head">head</a>().
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<p> You can control the queue's deletion policy with <a href="#setAutoDelete">setAutoDelete</a>().
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<p> For compatibility with the <a href="qptrcollection.html">QPtrCollection</a> classes, <a href="#current">current</a>() and
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<a href="#remove">remove</a>() are provided; both operate on the head().
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<p> <p>See also <a href="qptrlist.html">QPtrList</a>, <a href="qptrstack.html">QPtrStack</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="QPtrQueue"></a>QPtrQueue::QPtrQueue ()
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</h3>
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<p> Creates an empty queue with <a href="#autoDelete">autoDelete</a>() set to FALSE.
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<h3 class=fn><a name="QPtrQueue-2"></a>QPtrQueue::QPtrQueue ( const <a href="qptrqueue.html">QPtrQueue</a><type> & queue )
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</h3>
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<p> Creates a queue from <em>queue</em>.
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<p> Only the pointers are copied; the items are not. The <a href="#autoDelete">autoDelete</a>()
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flag is set to FALSE.
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<h3 class=fn><a name="~QPtrQueue"></a>QPtrQueue::~QPtrQueue ()
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</h3>
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<p> Destroys the queue. Items in the queue are deleted if <a href="#autoDelete">autoDelete</a>()
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is TRUE.
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<h3 class=fn>bool <a name="autoDelete"></a>QPtrQueue::autoDelete () const
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</h3>
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<p> Returns the setting of the auto-delete option. The default is
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FALSE.
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<p> <p>See also <a href="#setAutoDelete">setAutoDelete</a>().
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<h3 class=fn>void <a name="clear"></a>QPtrQueue::clear ()
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</h3>
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<p> Removes all items from the queue, and deletes them if <a href="#autoDelete">autoDelete</a>()
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is TRUE.
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<p> <p>See also <a href="#remove">remove</a>().
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<h3 class=fn>uint <a name="count"></a>QPtrQueue::count () const
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</h3>
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<p> Returns the number of items in the queue.
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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>QPtrQueue::current () const
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</h3>
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<p> Returns a pointer to the head item in the queue. The queue is not
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changed. Returns 0 if the queue is empty.
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<p> <p>See also <a href="#dequeue">dequeue</a>() and <a href="#isEmpty">isEmpty</a>().
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<h3 class=fn>type * <a name="dequeue"></a>QPtrQueue::dequeue ()
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</h3>
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<p> Takes the head item from the queue and returns a pointer to it.
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Returns 0 if the queue is empty.
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<p> <p>See also <a href="#enqueue">enqueue</a>() and <a href="#count">count</a>().
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<h3 class=fn>void <a name="enqueue"></a>QPtrQueue::enqueue ( const type * d )
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</h3>
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<p> Adds item <em>d</em> to the tail of the queue.
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<p> <p>See also <a href="#count">count</a>() and <a href="#dequeue">dequeue</a>().
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<h3 class=fn>type * <a name="head"></a>QPtrQueue::head () const
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</h3>
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<p> Returns a pointer to the head item in the queue. The queue is not
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changed. Returns 0 if the queue is empty.
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<p> <p>See also <a href="#dequeue">dequeue</a>() and <a href="#isEmpty">isEmpty</a>().
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<h3 class=fn>bool <a name="isEmpty"></a>QPtrQueue::isEmpty () const
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</h3>
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<p> Returns TRUE if the queue is empty; otherwise returns FALSE.
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<p> <p>See also <a href="#count">count</a>(), <a href="#dequeue">dequeue</a>(), and <a href="#head">head</a>().
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<h3 class=fn><a name="operator-type-*"></a>QPtrQueue::operator type * () const
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</h3>
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<p> Returns a pointer to the head item in the queue. The queue is not
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changed. Returns 0 if the queue is empty.
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<p> <p>See also <a href="#dequeue">dequeue</a>() and <a href="#isEmpty">isEmpty</a>().
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<h3 class=fn><a href="qptrqueue.html">QPtrQueue</a><type> & <a name="operator-eq"></a>QPtrQueue::operator= ( const <a href="qptrqueue.html">QPtrQueue</a><type> & queue )
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</h3>
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<p> Assigns <em>queue</em> to this queue and returns a reference to this
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queue.
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<p> This queue is first cleared and then each item in <em>queue</em> is
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enqueued to this queue. Only the pointers are copied.
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<p> <b>Warning:</b> The <a href="#autoDelete">autoDelete</a>() flag is not modified. If it it TRUE for
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both <em>queue</em> and this queue, deleting the two lists will cause <em>double-deletion</em> of the items.
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<h3 class=fn><a href="qdatastream.html">QDataStream</a> & <a name="read"></a>QPtrQueue::read ( <a href="qdatastream.html">QDataStream</a> & s, <a href="qptrcollection.html#Item">QPtrCollection::Item</a> & item )<tt> [virtual protected]</tt>
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</h3>
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<p> Reads a queue item, <em>item</em>, from the stream <em>s</em> and returns a
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reference to the stream.
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<p> The default implementation sets <em>item</em> to 0.
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<p> <p>See also <a href="#write">write</a>().
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<h3 class=fn>bool <a name="remove"></a>QPtrQueue::remove ()
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</h3>
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<p> Removes the head item from the queue, and returns TRUE if there
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was an item, i.e. the queue wasn't empty; otherwise returns FALSE.
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<p> The item is deleted if <a href="#autoDelete">autoDelete</a>() is TRUE.
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<p> <p>See also <a href="#head">head</a>(), <a href="#isEmpty">isEmpty</a>(), and <a href="#dequeue">dequeue</a>().
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<h3 class=fn>void <a name="setAutoDelete"></a>QPtrQueue::setAutoDelete ( bool enable )
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</h3>
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<p> Sets the queue to auto-delete its contents if <em>enable</em> is TRUE
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and not to delete them if <em>enable</em> is FALSE.
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<p> If auto-deleting is turned on, all the items in a queue are
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deleted when the queue itself is deleted. This can be quite
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convenient if the queue has the only pointer to the items.
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<p> The default setting is FALSE, for safety. If you turn it on, be
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careful about copying the queue: you might find yourself with two
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queues deleting the same items.
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<p> <p>See also <a href="#autoDelete">autoDelete</a>().
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<h3 class=fn><a href="qdatastream.html">QDataStream</a> & <a name="write"></a>QPtrQueue::write ( <a href="qdatastream.html">QDataStream</a> & s, <a href="qptrcollection.html#Item">QPtrCollection::Item</a> item ) const<tt> [virtual protected]</tt>
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</h3>
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<p> Writes a queue item, <em>item</em>, to the stream <em>s</em> and returns a
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reference to the stream.
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<p> The default implementation does nothing.
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<p> <p>See also <a href="#read">read</a>().
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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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