<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qobjectcleanuphandler.cpp:39 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>QObjectCleanupHandler Class</title> <style type="text/css"><!-- fn { margin-left: 1cm; text-indent: -1cm; } a:link { color: #004faf; text-decoration: none } a:visited { color: #672967; text-decoration: none } body { background: #ffffff; color: black; } --></style> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr bgcolor="#E5E5E5"> <td valign=center> <a href="index.html"> <font color="#004faf">Home</font></a> | <a href="classes.html"> <font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"> <font color="#004faf">Main Classes</font></a> | <a href="annotated.html"> <font color="#004faf">Annotated</font></a> | <a href="groups.html"> <font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"> <font color="#004faf">Functions</font></a> </td> <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> <p>The QObjectCleanupHandler class watches the lifetime of multiple QObjects. <a href="#details">More...</a> <p><tt>#include <<a href="qobjectcleanuphandler-h.html">qobjectcleanuphandler.h</a>></tt> <p>Inherits <a href="qobject.html">QObject</a>. <p><a href="qobjectcleanuphandler-members.html">List of all member functions.</a> <h2>Public Members</h2> <ul> <li class=fn><a href="#QObjectCleanupHandler"><b>QObjectCleanupHandler</b></a> ()</li> <li class=fn><a href="#~QObjectCleanupHandler"><b>~QObjectCleanupHandler</b></a> ()</li> <li class=fn>QObject * <a href="#add"><b>add</b></a> ( QObject * object )</li> <li class=fn>void <a href="#remove"><b>remove</b></a> ( QObject * object )</li> <li class=fn>bool <a href="#isEmpty"><b>isEmpty</b></a> () const</li> <li class=fn>void <a href="#clear"><b>clear</b></a> ()</li> </ul> <hr><a name="details"></a><h2>Detailed Description</h2> The QObjectCleanupHandler class watches the lifetime of multiple QObjects. <p> <p> A QObjectCleanupHandler is useful whenever you need to know when a number of <a href="qobject.html">QObject</a>s that are owned by someone else have been deleted. This is important, for example, when referencing memory in an application that has been allocated in a shared library. <p> Example: <p> <pre> class FactoryComponent : public FactoryInterface, public QLibraryInterface { public: ... <a href="qobject.html">QObject</a> *createObject(); bool init(); void cleanup(); bool canUnload() const; private: QObjectCleanupHandler objects; }; // allocate a new object, and add it to the cleanup handler QObject *FactoryComponent::createObject() { return objects.<a href="#add">add</a>( new <a href="qobject.html">QObject</a>() ); } // QLibraryInterface implementation bool FactoryComponent::init() { return TRUE; } void FactoryComponent::cleanup() { } // it is only safe to unload the library when all QObject's have been destroyed bool FactoryComponent::canUnload() const { return objects.<a href="#isEmpty">isEmpty</a>(); } </pre> <p>See also <a href="objectmodel.html">Object Model</a>. <hr><h2>Member Function Documentation</h2> <h3 class=fn><a name="QObjectCleanupHandler"></a>QObjectCleanupHandler::QObjectCleanupHandler () </h3> Constructs an empty QObjectCleanupHandler. <h3 class=fn><a name="~QObjectCleanupHandler"></a>QObjectCleanupHandler::~QObjectCleanupHandler () </h3> Destroys the cleanup handler. All objects in this cleanup handler will be deleted. <h3 class=fn><a href="qobject.html">QObject</a> * <a name="add"></a>QObjectCleanupHandler::add ( <a href="qobject.html">QObject</a> * object ) </h3> Adds <em>object</em> to this cleanup handler and returns the pointer to the object. <h3 class=fn>void <a name="clear"></a>QObjectCleanupHandler::clear () </h3> Deletes all objects in this cleanup handler. The cleanup handler becomes empty. <h3 class=fn>bool <a name="isEmpty"></a>QObjectCleanupHandler::isEmpty () const </h3> Returns TRUE if this cleanup handler is empty or if all objects in this cleanup handler have been destroyed; otherwise return FALSE. <h3 class=fn>void <a name="remove"></a>QObjectCleanupHandler::remove ( <a href="qobject.html">QObject</a> * object ) </h3> Removes the <em>object</em> from this cleanup handler. The object will not be destroyed. <!-- eof --> <hr><p> This file is part of the <a href="index.html">Qt toolkit</a>. Copyright © 1995-2007 <a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center> <table width=100% cellspacing=0 border=0><tr> <td>Copyright © 2007 <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> <td align=right><div align=right>Qt 3.3.8</div> </table></div></address></body> </html>