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140 lines
5.1 KiB
140 lines
5.1 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/src/kernel/qobjectcleanuphandler.cpp:39 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>QObjectCleanupHandler 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>QObjectCleanupHandler Class Reference</h1>
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<p>The QObjectCleanupHandler class watches the lifetime of multiple QObjects.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qobjectcleanuphandler-h.html">qobjectcleanuphandler.h</a>></tt>
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<p>Inherits <a href="qobject.html">QObject</a>.
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<p><a href="qobjectcleanuphandler-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="#QObjectCleanupHandler"><b>QObjectCleanupHandler</b></a> ()</li>
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<li class=fn><a href="#~QObjectCleanupHandler"><b>~QObjectCleanupHandler</b></a> ()</li>
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<li class=fn>QObject * <a href="#add"><b>add</b></a> ( QObject * object )</li>
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<li class=fn>void <a href="#remove"><b>remove</b></a> ( QObject * object )</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="#clear"><b>clear</b></a> ()</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QObjectCleanupHandler class watches the lifetime of multiple QObjects.
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<p>
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<p> A QObjectCleanupHandler is useful whenever you need to know when a
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number of <a href="qobject.html">QObject</a>s that are owned by someone else have been
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deleted. This is important, for example, when referencing memory
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in an application that has been allocated in a shared library.
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<p> Example:
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<p> <pre>
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class FactoryComponent : public FactoryInterface, public QLibraryInterface
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{
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public:
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...
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<a href="qobject.html">QObject</a> *createObject();
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bool init();
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void cleanup();
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bool canUnload() const;
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private:
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QObjectCleanupHandler objects;
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};
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// allocate a new object, and add it to the cleanup handler
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QObject *FactoryComponent::createObject()
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{
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return objects.<a href="#add">add</a>( new <a href="qobject.html">QObject</a>() );
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}
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// QLibraryInterface implementation
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bool FactoryComponent::init()
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{
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return TRUE;
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}
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void FactoryComponent::cleanup()
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{
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}
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// it is only safe to unload the library when all QObject's have been destroyed
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bool FactoryComponent::canUnload() const
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{
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return objects.<a href="#isEmpty">isEmpty</a>();
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}
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</pre>
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<p>See also <a href="objectmodel.html">Object Model</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QObjectCleanupHandler"></a>QObjectCleanupHandler::QObjectCleanupHandler ()
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</h3>
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Constructs an empty QObjectCleanupHandler.
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<h3 class=fn><a name="~QObjectCleanupHandler"></a>QObjectCleanupHandler::~QObjectCleanupHandler ()
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</h3>
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Destroys the cleanup handler. All objects in this cleanup handler
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will be deleted.
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<h3 class=fn><a href="qobject.html">QObject</a> * <a name="add"></a>QObjectCleanupHandler::add ( <a href="qobject.html">QObject</a> * object )
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</h3>
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Adds <em>object</em> to this cleanup handler and returns the pointer to
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the object.
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<h3 class=fn>void <a name="clear"></a>QObjectCleanupHandler::clear ()
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</h3>
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Deletes all objects in this cleanup handler. The cleanup handler
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becomes empty.
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<h3 class=fn>bool <a name="isEmpty"></a>QObjectCleanupHandler::isEmpty () const
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</h3>
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Returns TRUE if this cleanup handler is empty or if all objects in
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this cleanup handler have been destroyed; otherwise return FALSE.
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<h3 class=fn>void <a name="remove"></a>QObjectCleanupHandler::remove ( <a href="qobject.html">QObject</a> * object )
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</h3>
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Removes the <em>object</em> from this cleanup handler. The object will
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not be destroyed.
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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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