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<h1 class="title">Q3PtrQueue Class Reference</h1>
<!-- $$$Q3PtrQueue-brief -->
<p>The Q3PtrQueue class is a template class that provides a queue. <a href="#details">More...</a></p>
<!-- @@@Q3PtrQueue -->
<pre class="cpp"> <span class="preprocessor">#include <Q3PtrQueue></span></pre><p><b>This class is part of the Qt 3 support library.</b> It is provided to keep old source code working. We strongly advise against using it in new code. See <a href="porting4.html">Porting to Qt 4</a> for more information.</p>
<p><b>Inherits: </b><a href="q3ptrcollection.html">Q3PtrCollection</a>.</p>
<ul>
<li><a href="q3ptrqueue-members.html">List of all members, including inherited members</a></li>
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<a name="public-functions"></a>
<h2>Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="q3ptrqueue.html#Q3PtrQueue">Q3PtrQueue</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="q3ptrqueue.html#Q3PtrQueue-2">Q3PtrQueue</a></b> ( const Q3PtrQueue<type> & <i>queue</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="q3ptrqueue.html#dtor.Q3PtrQueue">~Q3PtrQueue</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="q3ptrqueue.html#autoDelete">autoDelete</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> type * </td><td class="memItemRight bottomAlign"><b><a href="q3ptrqueue.html#current">current</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> type * </td><td class="memItemRight bottomAlign"><b><a href="q3ptrqueue.html#dequeue">dequeue</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="q3ptrqueue.html#enqueue">enqueue</a></b> ( const type * <i>d</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> type * </td><td class="memItemRight bottomAlign"><b><a href="q3ptrqueue.html#head">head</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="q3ptrqueue.html#isEmpty">isEmpty</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="q3ptrqueue.html#remove">remove</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="q3ptrqueue.html#setAutoDelete">setAutoDelete</a></b> ( bool <i>enable</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="q3ptrqueue.html#operator-type--2a">operator type *</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> Q3PtrQueue<type> & </td><td class="memItemRight bottomAlign"><b><a href="q3ptrqueue.html#operator-eq">operator=</a></b> ( const Q3PtrQueue<type> & <i>queue</i> )</td></tr>
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<a name="reimplemented-public-functions"></a>
<h2>Reimplemented Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="q3ptrqueue.html#clear">clear</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual uint </td><td class="memItemRight bottomAlign"><b><a href="q3ptrqueue.html#count">count</a></b> () const</td></tr>
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<ul>
<li class="fn">4 public functions inherited from <a href="q3ptrcollection.html#public-functions">Q3PtrCollection</a></li>
</ul>
<a name="reimplemented-protected-functions"></a>
<h2>Reimplemented Protected Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual QDataStream & </td><td class="memItemRight bottomAlign"><b><a href="q3ptrqueue.html#read">read</a></b> ( QDataStream & <i>s</i>, Q3PtrCollection::Item & <i>item</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QDataStream & </td><td class="memItemRight bottomAlign"><b><a href="q3ptrqueue.html#write">write</a></b> ( QDataStream & <i>s</i>, Q3PtrCollection::Item <i>item</i> ) const</td></tr>
</table>
<ul>
<li class="fn">2 protected functions inherited from <a href="q3ptrcollection.html#protected-functions">Q3PtrCollection</a></li>
</ul>
<a name="details"></a>
<!-- $$$Q3PtrQueue-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The Q3PtrQueue class is a template class that provides a queue.</p>
<p><a href="q3valuevector.html">Q3ValueVector</a> can be used as an STL-compatible alternative to this class.</p>
<p>A template instance Q3PtrQueue<X> is a queue that operates on pointers to X (X*).</p>
<p>A queue is a first in, first out structure. Items are added to the tail of the queue with <a href="q3ptrqueue.html#enqueue">enqueue</a>() and retrieved from the head with <a href="q3ptrqueue.html#dequeue">dequeue</a>(). You can peek at the head item without dequeing it using <a href="q3ptrqueue.html#head">head</a>().</p>
<p>You can control the queue's deletion policy with <a href="q3ptrqueue.html#setAutoDelete">setAutoDelete</a>().</p>
<p>For compatibility with the <a href="q3ptrcollection.html">Q3PtrCollection</a> classes, <a href="q3ptrqueue.html#current">current</a>() and <a href="q3ptrqueue.html#remove">remove</a>() are provided; both operate on the <a href="q3ptrqueue.html#head">head</a>().</p>
</div>
<p><b>See also </b><a href="q3ptrlist.html">Q3PtrList</a> and <a href="q3ptrstack.html">Q3PtrStack</a>.</p>
<!-- @@@Q3PtrQueue -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$Q3PtrQueue[overload1]$$$Q3PtrQueue -->
<h3 class="fn"><a name="Q3PtrQueue"></a>Q3PtrQueue::<span class="name">Q3PtrQueue</span> ()</h3>
<p>Creates an empty queue with <a href="q3ptrqueue.html#autoDelete">autoDelete</a>() set to FALSE.</p>
<!-- @@@Q3PtrQueue -->
<!-- $$$Q3PtrQueue$$$Q3PtrQueueconstQ3PtrQueue<type>& -->
<h3 class="fn"><a name="Q3PtrQueue-2"></a>Q3PtrQueue::<span class="name">Q3PtrQueue</span> ( const <span class="type">Q3PtrQueue</span><<span class="type">type</span>> & <i>queue</i> )</h3>
<p>Creates a queue from <i>queue</i>.</p>
<p>Only the pointers are copied; the items are not. The <a href="q3ptrqueue.html#autoDelete">autoDelete</a>() flag is set to FALSE.</p>
<!-- @@@Q3PtrQueue -->
<!-- $$$~Q3PtrQueue[overload1]$$$~Q3PtrQueue -->
<h3 class="fn"><a name="dtor.Q3PtrQueue"></a>Q3PtrQueue::<span class="name">~Q3PtrQueue</span> ()</h3>
<p>Destroys the queue. Items in the queue are deleted if <a href="q3ptrqueue.html#autoDelete">autoDelete</a>() is TRUE.</p>
<!-- @@@~Q3PtrQueue -->
<!-- $$$autoDelete[overload1]$$$autoDelete -->
<h3 class="fn"><a name="autoDelete"></a><span class="type">bool</span> Q3PtrQueue::<span class="name">autoDelete</span> () const</h3>
<p>Returns the setting of the auto-delete option. The default is FALSE.</p>
<p><b>See also </b><a href="q3ptrqueue.html#setAutoDelete">setAutoDelete</a>().</p>
<!-- @@@autoDelete -->
<!-- $$$clear[overload1]$$$clear -->
<h3 class="fn"><a name="clear"></a><span class="type">void</span> Q3PtrQueue::<span class="name">clear</span> ()<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="q3ptrcollection.html#clear">Q3PtrCollection::clear</a>().</p>
<p>Removes all items from the queue, and deletes them if <a href="q3ptrqueue.html#autoDelete">autoDelete</a>() is TRUE.</p>
<p><b>See also </b><a href="q3ptrqueue.html#remove">remove</a>().</p>
<!-- @@@clear -->
<!-- $$$count[overload1]$$$count -->
<h3 class="fn"><a name="count"></a><span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> Q3PtrQueue::<span class="name">count</span> () const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="q3ptrcollection.html#count">Q3PtrCollection::count</a>().</p>
<p>Returns the number of items in the queue.</p>
<p><b>See also </b><a href="q3ptrqueue.html#isEmpty">isEmpty</a>().</p>
<!-- @@@count -->
<!-- $$$current[overload1]$$$current -->
<h3 class="fn"><a name="current"></a><span class="type">type</span> * Q3PtrQueue::<span class="name">current</span> () const</h3>
<p>Returns a pointer to the head item in the queue. The queue is not changed. Returns 0 if the queue is empty.</p>
<p><b>See also </b><a href="q3ptrqueue.html#dequeue">dequeue</a>() and <a href="q3ptrqueue.html#isEmpty">isEmpty</a>().</p>
<!-- @@@current -->
<!-- $$$dequeue[overload1]$$$dequeue -->
<h3 class="fn"><a name="dequeue"></a><span class="type">type</span> * Q3PtrQueue::<span class="name">dequeue</span> ()</h3>
<p>Takes the head item from the queue and returns a pointer to it. Returns 0 if the queue is empty.</p>
<p><b>See also </b><a href="q3ptrqueue.html#enqueue">enqueue</a>() and <a href="q3ptrqueue.html#count">count</a>().</p>
<!-- @@@dequeue -->
<!-- $$$enqueue[overload1]$$$enqueueconsttype* -->
<h3 class="fn"><a name="enqueue"></a><span class="type">void</span> Q3PtrQueue::<span class="name">enqueue</span> ( const <span class="type">type</span> * <i>d</i> )</h3>
<p>Adds item <i>d</i> to the tail of the queue.</p>
<p><b>See also </b><a href="q3ptrqueue.html#count">count</a>() and <a href="q3ptrqueue.html#dequeue">dequeue</a>().</p>
<!-- @@@enqueue -->
<!-- $$$head[overload1]$$$head -->
<h3 class="fn"><a name="head"></a><span class="type">type</span> * Q3PtrQueue::<span class="name">head</span> () const</h3>
<p>Returns a pointer to the head item in the queue. The queue is not changed. Returns 0 if the queue is empty.</p>
<p><b>See also </b><a href="q3ptrqueue.html#dequeue">dequeue</a>() and <a href="q3ptrqueue.html#isEmpty">isEmpty</a>().</p>
<!-- @@@head -->
<!-- $$$isEmpty[overload1]$$$isEmpty -->
<h3 class="fn"><a name="isEmpty"></a><span class="type">bool</span> Q3PtrQueue::<span class="name">isEmpty</span> () const</h3>
<p>Returns TRUE if the queue is empty; otherwise returns FALSE.</p>
<p><b>See also </b><a href="q3ptrqueue.html#count">count</a>(), <a href="q3ptrqueue.html#dequeue">dequeue</a>(), and <a href="q3ptrqueue.html#head">head</a>().</p>
<!-- @@@isEmpty -->
<!-- $$$read[overload1]$$$readQDataStream&Q3PtrCollection::Item& -->
<h3 class="fn"><a name="read"></a><span class="type"><a href="qdatastream.html">QDataStream</a></span> & Q3PtrQueue::<span class="name">read</span> ( <span class="type"><a href="qdatastream.html">QDataStream</a></span> & <i>s</i>, <span class="type"><a href="q3ptrcollection.html#Item-typedef">Q3PtrCollection::Item</a></span> & <i>item</i> )<tt> [virtual protected]</tt></h3>
<p>Reads a queue item, <i>item</i>, from the stream <i>s</i> and returns a reference to the stream.</p>
<p>The default implementation sets <i>item</i> to 0.</p>
<p><b>See also </b><a href="q3ptrqueue.html#write">write</a>().</p>
<!-- @@@read -->
<!-- $$$remove[overload1]$$$remove -->
<h3 class="fn"><a name="remove"></a><span class="type">bool</span> Q3PtrQueue::<span class="name">remove</span> ()</h3>
<p>Removes the head item from the queue, and returns TRUE if there was an item, i.e. the queue wasn't empty; otherwise returns FALSE.</p>
<p>The item is deleted if <a href="q3ptrqueue.html#autoDelete">autoDelete</a>() is TRUE.</p>
<p><b>See also </b><a href="q3ptrqueue.html#head">head</a>(), <a href="q3ptrqueue.html#isEmpty">isEmpty</a>(), and <a href="q3ptrqueue.html#dequeue">dequeue</a>().</p>
<!-- @@@remove -->
<!-- $$$setAutoDelete[overload1]$$$setAutoDeletebool -->
<h3 class="fn"><a name="setAutoDelete"></a><span class="type">void</span> Q3PtrQueue::<span class="name">setAutoDelete</span> ( <span class="type">bool</span> <i>enable</i> )</h3>
<p>Sets the queue to auto-delete its contents if <i>enable</i> is TRUE and not to delete them if <i>enable</i> is FALSE.</p>
<p>If auto-deleting is turned on, all the items in a queue are deleted when the queue itself is deleted. This can be quite convenient if the queue has the only pointer to the items.</p>
<p>The default setting is FALSE, for safety. If you turn it on, be careful about copying the queue: you might find yourself with two queues deleting the same items.</p>
<p><b>See also </b><a href="q3ptrqueue.html#autoDelete">autoDelete</a>().</p>
<!-- @@@setAutoDelete -->
<!-- $$$write[overload1]$$$writeQDataStream&Q3PtrCollection::Item -->
<h3 class="fn"><a name="write"></a><span class="type"><a href="qdatastream.html">QDataStream</a></span> & Q3PtrQueue::<span class="name">write</span> ( <span class="type"><a href="qdatastream.html">QDataStream</a></span> & <i>s</i>, <span class="type"><a href="q3ptrcollection.html#Item-typedef">Q3PtrCollection::Item</a></span> <i>item</i> ) const<tt> [virtual protected]</tt></h3>
<p>Writes a queue item, <i>item</i>, to the stream <i>s</i> and returns a reference to the stream.</p>
<p>The default implementation does nothing.</p>
<p><b>See also </b><a href="q3ptrqueue.html#read">read</a>().</p>
<!-- @@@write -->
<!-- $$$operator type *[overload1]$$$operator type * -->
<h3 class="fn"><a name="operator-type--2a"></a>Q3PtrQueue::<span class="name">operator type *</span> () const</h3>
<p>Returns a pointer to the head item in the queue. The queue is not changed. Returns 0 if the queue is empty.</p>
<p><b>See also </b><a href="q3ptrqueue.html#dequeue">dequeue</a>() and <a href="q3ptrqueue.html#isEmpty">isEmpty</a>().</p>
<!-- @@@operator type * -->
<!-- $$$operator=[overload1]$$$operator=constQ3PtrQueue<type>& -->
<h3 class="fn"><a name="operator-eq"></a><span class="type">Q3PtrQueue</span><<span class="type">type</span>> & Q3PtrQueue::<span class="name">operator=</span> ( const <span class="type">Q3PtrQueue</span><<span class="type">type</span>> & <i>queue</i> )</h3>
<p>Assigns <i>queue</i> to this queue and returns a reference to this queue.</p>
<p>This queue is first cleared and then each item in <i>queue</i> is enqueued to this queue. Only the pointers are copied.</p>
<p><b>Warning:</b> The <a href="q3ptrqueue.html#autoDelete">autoDelete</a>() flag is not modified. If it is TRUE for both <i>queue</i> and this queue, deleting the two lists will cause <i>double-deletion</i> of the items.</p>
<!-- @@@operator= -->
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