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-'\" t
-.TH QObjectCleanupHandler 3qt "2 February 2007" "Trolltech AS" \" -*- nroff -*-
-.\" Copyright 1992-2007 Trolltech ASA. All rights reserved. See the
-.\" license file included in the distribution for a complete license
-.\" statement.
-.\"
-.ad l
-.nh
-.SH NAME
-QObjectCleanupHandler \- Watches the lifetime of multiple QObjects
-.SH SYNOPSIS
-\fC#include <ntqobjectcleanuphandler.h>\fR
-.PP
-Inherits QObject.
-.PP
-.SS "Public Members"
-.in +1c
-.ti -1c
-.BI "\fBQObjectCleanupHandler\fR ()"
-.br
-.ti -1c
-.BI "\fB~QObjectCleanupHandler\fR ()"
-.br
-.ti -1c
-.BI "QObject * \fBadd\fR ( QObject * object )"
-.br
-.ti -1c
-.BI "void \fBremove\fR ( QObject * object )"
-.br
-.ti -1c
-.BI "bool \fBisEmpty\fR () const"
-.br
-.ti -1c
-.BI "void \fBclear\fR ()"
-.br
-.in -1c
-.SH DESCRIPTION
-The QObjectCleanupHandler class watches the lifetime of multiple QObjects.
-.PP
-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.
-.PP
-Example:
-.PP
-.nf
-.br
- class FactoryComponent : public FactoryInterface, public QLibraryInterface
-.br
- {
-.br
- public:
-.br
- ...
-.br
-.br
- QObject *createObject();
-.br
-.br
- bool init();
-.br
- void cleanup();
-.br
- bool canUnload() const;
-.br
-.br
- private:
-.br
- QObjectCleanupHandler objects;
-.br
- };
-.br
-.br
- // allocate a new object, and add it to the cleanup handler
-.br
- QObject *FactoryComponent::createObject()
-.br
- {
-.br
- return objects.add( new QObject() );
-.br
- }
-.br
-.br
- // QLibraryInterface implementation
-.br
- bool FactoryComponent::init()
-.br
- {
-.br
- return TRUE;
-.br
- }
-.br
-.br
- void FactoryComponent::cleanup()
-.br
- {
-.br
- }
-.br
-.br
- // it is only safe to unload the library when all QObject's have been destroyed
-.br
- bool FactoryComponent::canUnload() const
-.br
- {
-.br
- return objects.isEmpty();
-.br
- }
-.br
-.fi
-.PP
-See also Object Model.
-.SH MEMBER FUNCTION DOCUMENTATION
-.SH "QObjectCleanupHandler::QObjectCleanupHandler ()"
-Constructs an empty QObjectCleanupHandler.
-.SH "QObjectCleanupHandler::~QObjectCleanupHandler ()"
-Destroys the cleanup handler. All objects in this cleanup handler will be deleted.
-.SH "QObject * QObjectCleanupHandler::add ( QObject * object )"
-Adds \fIobject\fR to this cleanup handler and returns the pointer to the object.
-.SH "void QObjectCleanupHandler::clear ()"
-Deletes all objects in this cleanup handler. The cleanup handler becomes empty.
-.SH "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.
-.SH "void QObjectCleanupHandler::remove ( QObject * object )"
-Removes the \fIobject\fR from this cleanup handler. The object will
-not be destroyed.
-
-.SH "SEE ALSO"
-.BR http://doc.trolltech.com/ntqobjectcleanuphandler.html
-.BR http://www.trolltech.com/faq/tech.html
-.SH COPYRIGHT
-Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
-license file included in the distribution for a complete license
-statement.
-.SH AUTHOR
-Generated automatically from the source code.
-.SH BUGS
-If you find a bug in Qt, please report it as described in
-.BR http://doc.trolltech.com/bughowto.html .
-Good bug reports help us to help you. Thank you.
-.P
-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.
-.P
-If you find errors in this manual page, please report them to
-.BR qt-bugs@trolltech.com .
-Please include the name of the manual page (qobjectcleanuphandler.3qt) and the Qt
-version (3.3.8).