/******************************************************************************** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.**** This file is part of the QtCore module of the Qt Toolkit.**** This file may be used under the terms of the GNU General Public** License version 2.0 as published by the Free Software Foundation** and appearing in the file LICENSE.GPL included in the packaging of** this file.  Please review the following information to ensure GNU** General Public Licensing requirements will be met:** http://www.trolltech.com/products/qt/opensource.html**** If you are unsure which license is appropriate for your use, please** review the following information:** http://www.trolltech.com/products/qt/licensing.html or contact the** sales department at sales@trolltech.com.**** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.******************************************************************************/#include "qobjectcleanuphandler.h"/*!    \class QObjectCleanupHandler    \brief The QObjectCleanupHandler class watches the lifetime of multiple QObjects.    \ingroup objectmodel    A QObjectCleanupHandler is useful whenever you need to know when a    number of \l{QObject}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.    To keep track of some \l{QObject}s, create a    QObjectCleanupHandler, and add() the objects you are interested    in. If you are no longer interested in tracking a particular    object, use remove() to remove it from the cleanup handler. If an    object being tracked by the cleanup handler gets deleted by    someone else it will automatically be removed from the cleanup    handler. You can delete all the objects in the cleanup handler    with clear(), or by destroying the cleanup handler. isEmpty()    returns true if the QObjectCleanupHandler has no objects to keep    track of.    \sa QPointer*//*!    Constructs an empty QObjectCleanupHandler.*/QObjectCleanupHandler::QObjectCleanupHandler(){}/*!    Destroys the cleanup handler. All objects in this cleanup handler    will be deleted.    \sa clear()*/QObjectCleanupHandler::~QObjectCleanupHandler(){    clear();}/*!    Adds \a object to this cleanup handler and returns the pointer to    the object.    \sa remove()*/QObject *QObjectCleanupHandler::add(QObject* object){    if (!object)        return 0;    connect(object, SIGNAL(destroyed(QObject*)), this, SLOT(objectDestroyed(QObject*)));    cleanupObjects.insert(0, object);    return object;}/*!    Removes the \a object from this cleanup handler. The object will    not be destroyed.    \sa add()*/void QObjectCleanupHandler::remove(QObject *object){    int index;    if ((index = cleanupObjects.indexOf(object)) != -1) {        cleanupObjects.removeAt(index);        disconnect(object, SIGNAL(destroyed(QObject*)), this, SLOT(objectDestroyed(QObject*)));    }}/*!    Returns true if this cleanup handler is empty or if all objects in    this cleanup handler have been destroyed; otherwise return false.    \sa add() remove() clear()*/bool QObjectCleanupHandler::isEmpty() const{    return cleanupObjects.isEmpty();}/*!    Deletes all objects in this cleanup handler. The cleanup handler    becomes empty.    \sa isEmpty()*/void QObjectCleanupHandler::clear(){    while (!cleanupObjects.isEmpty())        delete cleanupObjects.takeFirst();}void QObjectCleanupHandler::objectDestroyed(QObject *object){    remove(object);}