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<title>QObjectCleanupHandler 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>QObjectCleanupHandler Class Reference</h1>

<p>The QObjectCleanupHandler class watches the lifetime of multiple QObjects.
<a href="#details">More...</a>
<p><tt>#include &lt;<a href="qobjectcleanuphandler-h.html">qobjectcleanuphandler.h</a>&gt;</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&nbsp;*&nbsp;object )</li>
<li class=fn>void <a href="#remove"><b>remove</b></a> ( QObject&nbsp;*&nbsp;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>&nbsp;* <a name="add"></a>QObjectCleanupHandler::add ( <a href="qobject.html">QObject</a>&nbsp;*&nbsp;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>&nbsp;*&nbsp;object )
</h3>
Removes the <em>object</em> from this cleanup handler. The object will
not be destroyed.

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