qobjectcleanuphandler.3qt man page

QObjectCleanupHandler — Watches the lifetime of multiple QObjects


#include <qobjectcleanuphandler.h>

Inherits QObject.

Public Members

QObjectCleanupHandler ()
~QObjectCleanupHandler ()
QObject * add ( QObject * object )
void remove ( QObject * object )
bool isEmpty () const
void clear ()


The QObjectCleanupHandler class watches the lifetime of multiple QObjects.

A QObjectCleanupHandler is useful whenever you need to know when a number of QObjects 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.


    class FactoryComponent : public FactoryInterface, public QLibraryInterface
        QObject *createObject();
        bool init();
        void cleanup();
        bool canUnload() const;
        QObjectCleanupHandler objects;
    // allocate a new object, and add it to the cleanup handler
    QObject *FactoryComponent::createObject()
        return objects.add( new QObject() );
    // 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.isEmpty();

See also Object Model.

Member Function Documentation

QObjectCleanupHandler::QObjectCleanupHandler ()

Constructs an empty QObjectCleanupHandler.

QObjectCleanupHandler::~QObjectCleanupHandler ()

Destroys the cleanup handler. All objects in this cleanup handler will be deleted.

QObject * QObjectCleanupHandler::add ( QObject * object )

Adds object to this cleanup handler and returns the pointer to the object.

void QObjectCleanupHandler::clear ()

Deletes all objects in this cleanup handler. The cleanup handler becomes empty.

bool QObjectCleanupHandler::isEmpty () const

Returns TRUE if this cleanup handler is empty or if all objects in this cleanup handler have been destroyed; otherwise return FALSE.

void QObjectCleanupHandler::remove ( QObject * object )

Removes the object from this cleanup handler. The object will not be destroyed.

See Also

http://doc.trolltech.com/qobjectcleanuphandler.html http://www.trolltech.com/faq/tech.html


Generated automatically from the source code.


If you find a bug in Qt, please report it as described in http://doc.trolltech.com/bughowto.html. Good bug reports help us to help you. Thank you.

The definitive Qt documentation is provided in HTML format; it is located at $QTDIR/doc/html and can be read using Qt Assistant or with a web browser. This man page is provided as a convenience for those users who prefer man pages, although this format is not officially supported by Trolltech.

If you find errors in this manual page, please report them to qt-bugs@trolltech.com. Please include the name of the manual page (qobjectcleanuphandler.3qt) and the Qt version (3.3.8).

Referenced By

QObjectCleanupHandler.3qt(3) is an alias of qobjectcleanuphandler.3qt(3).

2 February 2007 Trolltech AS