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202 lines
8.8 KiB
202 lines
8.8 KiB
14 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/qptrstack.doc:41 -->
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<title>QPtrStack 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>QPtrStack Class Reference</h1>
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<p>The QPtrStack class is a template class that provides a stack.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qptrstack-h.html">qptrstack.h</a>></tt>
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<p><a href="qptrstack-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="#QPtrStack"><b>QPtrStack</b></a> ()</li>
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<li class=fn><a href="#QPtrStack-2"><b>QPtrStack</b></a> ( const QPtrStack<type> & s )</li>
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<li class=fn><a href="#~QPtrStack"><b>~QPtrStack</b></a> ()</li>
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<li class=fn>QPtrStack<type> & <a href="#operator-eq"><b>operator=</b></a> ( const QPtrStack<type> & s )</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="#push"><b>push</b></a> ( const type * d )</li>
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<li class=fn>type * <a href="#pop"><b>pop</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="#top"><b>top</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 QPtrStack class is a template class that provides a stack.
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<p>
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<p> <a href="qvaluestack.html">QValueStack</a> is an STL-compatible alternative to this class.
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<p> Define a template instance QPtrStack<X> to create a stack that
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operates on pointers to X, (X*).
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<p> A stack is a last in, first out (LIFO) structure. Items are added
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to the top of the stack with <a href="#push">push</a>() and retrieved from the top
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with <a href="#pop">pop</a>(). Use <a href="#top">top</a>() to get a reference to the top element
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without changing the stack.
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<p> You can control the stack'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; they both operate on the top().
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<p> <p>See also <a href="qptrlist.html">QPtrList</a>, <a href="qptrqueue.html">QPtrQueue</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="QPtrStack"></a>QPtrStack::QPtrStack ()
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</h3>
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<p> Creates an empty stack.
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<h3 class=fn><a name="QPtrStack-2"></a>QPtrStack::QPtrStack ( const <a href="qptrstack.html">QPtrStack</a><type> & s )
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</h3>
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<p> Creates a stack by making a <a href="shclass.html#shallow-copy">shallow copy</a> of another stack <em>s</em>.
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<h3 class=fn><a name="~QPtrStack"></a>QPtrStack::~QPtrStack ()
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</h3>
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<p> Destroys the stack. All items will be deleted if <a href="#autoDelete">autoDelete</a>() is
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TRUE.
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<h3 class=fn>bool <a name="autoDelete"></a>QPtrStack::autoDelete () const
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</h3>
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<p> The same as <a href="qptrcollection.html#autoDelete">QPtrCollection::autoDelete</a>().
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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>QPtrStack::clear ()
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</h3>
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<p> Removes all items from the stack, deleting them if <a href="#autoDelete">autoDelete</a>() is
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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>QPtrStack::count () const
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</h3>
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<p> Returns the number of items in the stack.
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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>QPtrStack::current () const
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</h3>
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<p> Returns a pointer to the top item on the stack (most recently
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pushed). The stack is not changed. Returns 0 if the stack is
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empty.
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<h3 class=fn>bool <a name="isEmpty"></a>QPtrStack::isEmpty () const
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</h3>
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<p> Returns TRUE if the stack contains no elements; otherwise returns
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FALSE.
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<h3 class=fn><a name="operator-type-*"></a>QPtrStack::operator type * () const
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</h3>
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<p> Returns a pointer to the top item on the stack (most recently
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pushed). The stack is not changed. Returns 0 if the stack is
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empty.
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<h3 class=fn><a href="qptrstack.html">QPtrStack</a><type> & <a name="operator-eq"></a>QPtrStack::operator= ( const <a href="qptrstack.html">QPtrStack</a><type> & s )
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</h3>
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<p> Sets the contents of this stack by making a <a href="shclass.html#shallow-copy">shallow copy</a> of
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another stack <em>s</em>. Elements currently in this stack will be
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deleted if <a href="#autoDelete">autoDelete</a>() is TRUE.
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<h3 class=fn>type * <a name="pop"></a>QPtrStack::pop ()
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</h3>
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<p> Removes the top item from the stack and returns it. The stack must
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not be empty.
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<h3 class=fn>void <a name="push"></a>QPtrStack::push ( const type * d )
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</h3>
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<p> Adds an element <em>d</em> to the top of the stack. Last in, first out.
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<h3 class=fn><a href="qdatastream.html">QDataStream</a> & <a name="read"></a>QPtrStack::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 stack 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>QPtrStack::remove ()
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</h3>
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<p> Removes the top item from the stack and deletes it if <a href="#autoDelete">autoDelete</a>()
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is TRUE. Returns TRUE if there was an item to pop; otherwise
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returns FALSE.
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<p> <p>See also <a href="#clear">clear</a>().
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<h3 class=fn>void <a name="setAutoDelete"></a>QPtrStack::setAutoDelete ( bool enable )
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</h3>
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<p> Defines whether this stack auto-deletes its contents. The same as
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<a href="qptrcollection.html#setAutoDelete">QPtrCollection::setAutoDelete</a>().
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<p> If <em>enable</em> is TRUE the stack auto-deletes its contents; if <em>enable</em> is FALSE the stack does not delete its contents.
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<p> <p>See also <a href="#autoDelete">autoDelete</a>().
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<h3 class=fn>type * <a name="top"></a>QPtrStack::top () const
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</h3>
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<p> Returns a pointer to the top item on the stack (most recently
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pushed). The stack is not changed. Returns 0 if the stack is
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empty.
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<h3 class=fn><a href="qdatastream.html">QDataStream</a> & <a name="write"></a>QPtrStack::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 stack 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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<!-- 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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</html>
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