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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QMLGUARD_P_H
#define QMLGUARD_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp. This header
// file may change from version to version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/qglobal.h>
QT_BEGIN_NAMESPACE
class QObject;
template<class T>
class QmlGuard
{
QObject *o;
QmlGuard<QObject> *next;
QmlGuard<QObject> **prev;
friend class QmlDeclarativeData;
public:
inline QmlGuard();
inline QmlGuard(T *);
inline QmlGuard(const QmlGuard<T> &);
inline virtual ~QmlGuard();
inline QmlGuard<T> &operator=(const QmlGuard<T> &o);
inline QmlGuard<T> &operator=(T *);
inline bool isNull() const
{ return !o; }
inline T* operator->() const
{ return static_cast<T*>(const_cast<QObject*>(o)); }
inline T& operator*() const
{ return *static_cast<T*>(const_cast<QObject*>(o)); }
inline operator T*() const
{ return static_cast<T*>(const_cast<QObject*>(o)); }
inline T* data() const
{ return static_cast<T*>(const_cast<QObject*>(o)); }
protected:
virtual void objectDestroyed(T *) {}
private:
inline void addGuard();
inline void remGuard();
};
Q_DECLARE_METATYPE(QmlGuard<QObject>);
QT_END_NAMESPACE
#include "qmldeclarativedata_p.h"
QT_BEGIN_NAMESPACE
template<class T>
QmlGuard<T>::QmlGuard()
: o(0), next(0), prev(0)
{
}
template<class T>
QmlGuard<T>::QmlGuard(T *g)
: o(g), next(0), prev(0)
{
if (o) addGuard();
}
template<class T>
QmlGuard<T>::QmlGuard(const QmlGuard<T> &g)
: o(g.o), next(0), prev(0)
{
if (o) addGuard();
}
template<class T>
QmlGuard<T>::~QmlGuard()
{
if (prev) remGuard();
o = 0;
}
template<class T>
QmlGuard<T> &QmlGuard<T>::operator=(const QmlGuard<T> &g)
{
if (g.o != o) {
if (prev) remGuard();
o = g.o;
if (o) addGuard();
}
return *this;
}
template<class T>
QmlGuard<T> &QmlGuard<T>::operator=(T *g)
{
if (g != o) {
if (prev) remGuard();
o = g;
if (o) addGuard();
}
return *this;
}
QT_END_NAMESPACE
#endif // QMLGUARD_P_H
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