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/****************************************************************************
** $Id: qt/src/kernel/qguardedptr.h 2.3.1 edited 2001-01-26 $
**
** Definition of QGuardedPtr class
**
** Created : 990929
**
** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.
**
** This file is part of the kernel module of the Qt GUI Toolkit.
**
** This file may be distributed under the terms of the Q Public License
** as defined by Trolltech AS 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.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
** information about Qt Commercial License Agreements.
** See http://www.trolltech.com/qpl/ for QPL licensing information.
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/
#ifndef QGUARDEDPTR_H
#define QGUARDEDPTR_H
#ifndef QT_H
#include "qobject.h"
#endif // QT_H
class Q_EXPORT QGuardedPtrPrivate : public QObject, public QShared
{
Q_OBJECT
public:
QGuardedPtrPrivate( QObject*);
~QGuardedPtrPrivate();
QObject* object() const;
private slots:
void objectDestroyed();
private:
QObject* obj;
};
template <class T> class Q_EXPORT QGuardedPtr
{
public:
QGuardedPtr()
{
priv = new QGuardedPtrPrivate( 0 );
}
QGuardedPtr( T* o)
{
#if defined(Q_TEMPLATE_NEEDS_EXPLICIT_CONVERSION)
priv = new QGuardedPtrPrivate( (QObject*)o );
#else
priv = new QGuardedPtrPrivate( o );
#endif
}
QGuardedPtr(const QGuardedPtr<T> &p)
{
priv = p.priv;
ref();
}
~QGuardedPtr()
{
deref();
}
QGuardedPtr<T> &operator=(const QGuardedPtr<T> &p)
{
if ( priv != p.priv ) {
deref();
priv = p.priv;
ref();
}
return *this;
}
QGuardedPtr<T> &operator=(T* o)
{
deref();
#if defined(Q_TEMPLATE_NEEDS_EXPLICIT_CONVERSION)
priv = new QGuardedPtrPrivate( (QObject*)o );
#else
priv = new QGuardedPtrPrivate( o );
#endif
return *this;
}
bool operator==( const QGuardedPtr<T> &p ) const
{
return priv->object() == p.priv->object();
}
bool operator!= ( const QGuardedPtr<T>& p ) const
{
return !( *this == p );
}
bool isNull() const
{
return !priv->object();
}
T* operator->() const
{
return (T*) priv->object();
}
T& operator*() const
{
return *( (T*)priv->object() );
}
operator T*() const
{
return (T*) priv->object();
}
private:
void ref()
{
priv->ref();
}
void deref()
{
if ( priv->deref() )
delete priv;
}
QGuardedPtrPrivate* priv;
};
inline QObject* QGuardedPtrPrivate::object() const
{
return obj;
}
#endif
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