src/qt/include/qcleanuphandler.h

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/****************************************************************************
** $Id: qt/qcleanuphandler.h   3.3.8   edited Jan 11 14:46 $
**
** ...
**
** Copyright (C) 2001-2007 Trolltech ASA.  All rights reserved.
**
** This file is part of the tools module of the Qt GUI Toolkit.
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** This file may be distributed under the terms of the Q Public License
** as defined by Trolltech ASA of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
** licenses may use this file in accordance with the Qt Commercial License
** Agreement provided with the Software.
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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**   information about Qt Commercial License Agreements.
** See http://www.trolltech.com/qpl/ for QPL licensing information.
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**********************************************************************/

#ifndef QCLEANUPHANDLER_H
#define QCLEANUPHANDLER_H

#ifndef QT_H
#include "qptrlist.h"
#endif // QT_H

template<class Type>
class QCleanupHandler
{
public:
    QCleanupHandler() : cleanupObjects( 0 ) {}
    ~QCleanupHandler() { clear(); }

    Type* add( Type **object ) {
        if ( !cleanupObjects )
            cleanupObjects = new QPtrList<Type*>;
        cleanupObjects->insert( 0, object );
        return *object;
    }

    void remove( Type **object ) {
        if ( !cleanupObjects )
            return;
        if ( cleanupObjects->findRef( object ) >= 0 )
            (void) cleanupObjects->take();
    }

    bool isEmpty() const {
        return cleanupObjects ? cleanupObjects->isEmpty() : TRUE;
    }

    void clear() {
        if ( !cleanupObjects )
            return;
        QPtrListIterator<Type*> it( *cleanupObjects );
        Type **object;
        while ( ( object = it.current() ) ) {
            delete *object;
            *object = 0;
            cleanupObjects->remove( object );
        }
        delete cleanupObjects;
        cleanupObjects = 0;
    }

private:
    QPtrList<Type*> *cleanupObjects;
};

template<class Type>
class QSingleCleanupHandler
{
public:
    QSingleCleanupHandler() : object( 0 ) {}
    ~QSingleCleanupHandler() {
        if ( object ) {
            delete *object;
            *object = 0;
        }
    }
    Type* set( Type **o ) {
        object = o;
        return *object;
    }
    void reset() { object = 0; }
private:
    Type **object;
};

template<class Type>
class QSharedCleanupHandler
{
public:
    QSharedCleanupHandler() : object( 0 ) {}
    ~QSharedCleanupHandler() {
        if ( object ) {
            if ( (*object)->deref() )
                delete *object;
            *object = 0;
        }
    }
    Type* set( Type **o ) {
        object = o;
        return *object;
    }
    void reset() { object = 0; }
private:
    Type **object;
};

#endif //QCLEANUPHANDLER_H