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qobjectcleanuphandler

man page of qobjectcleanuphandler

qobjectcleanuphandler: Watches the lifetime of multiple QObjects

NAME
QObjectCleanupHandler - Watches the lifetime of multiple QObjects

SYNOPSIS

#include <qobjectcleanuphandler.h> Inherits QObject. Public Members QObjectCleanupHandler () ~QObjectCleanupHandler () QObject * add ( QObject * object ) void remove ( QObject * object ) bool isEmpty () const void clear ()

DESCRIPTION

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. Example: class FactoryComponent : public FactoryInterface, public QLibraryInterface { public: ... QObject *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.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

//doc.trolltech.com/qobjectcleanuphandler.html //www.trolltech.com/faq/tech.html
COPYRIGHT
Copyright 1992-2007 Trolltech ASA, //www.trolltech.com. See the license file included in the distribution for a complete license statement.
AUTHOR
Generated automatically from the source code.

BUGS

If you find a bug in Qt, please report it as described in //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). QOBJECTCLEANUPHANDLER(3)
 
 
 

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