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+/****************************************************************************
+**
+** Copyright (C) 2010 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 QDECLARATIVEGUARD_P_H
+#define QDECLARATIVEGUARD_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>
+#include <QtCore/qvariant.h>
+
+QT_BEGIN_NAMESPACE
+
+class QObject;
+template<class T>
+class QDeclarativeGuard
+{
+ QObject *o;
+ QDeclarativeGuard<QObject> *next;
+ QDeclarativeGuard<QObject> **prev;
+ friend class QDeclarativeDeclarativeData;
+public:
+ inline QDeclarativeGuard();
+ inline QDeclarativeGuard(T *);
+ inline QDeclarativeGuard(const QDeclarativeGuard<T> &);
+ inline virtual ~QDeclarativeGuard();
+
+ inline QDeclarativeGuard<T> &operator=(const QDeclarativeGuard<T> &o);
+ inline QDeclarativeGuard<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();
+};
+
+QT_END_NAMESPACE
+
+Q_DECLARE_METATYPE(QDeclarativeGuard<QObject>);
+
+#include "qdeclarativedeclarativedata_p.h"
+
+QT_BEGIN_NAMESPACE
+
+template<class T>
+QDeclarativeGuard<T>::QDeclarativeGuard()
+: o(0), next(0), prev(0)
+{
+}
+
+template<class T>
+QDeclarativeGuard<T>::QDeclarativeGuard(T *g)
+: o(g), next(0), prev(0)
+{
+ if (o) addGuard();
+}
+
+template<class T>
+QDeclarativeGuard<T>::QDeclarativeGuard(const QDeclarativeGuard<T> &g)
+: o(g.o), next(0), prev(0)
+{
+ if (o) addGuard();
+}
+
+template<class T>
+QDeclarativeGuard<T>::~QDeclarativeGuard()
+{
+ if (prev) remGuard();
+ o = 0;
+}
+
+template<class T>
+QDeclarativeGuard<T> &QDeclarativeGuard<T>::operator=(const QDeclarativeGuard<T> &g)
+{
+ if (g.o != o) {
+ if (prev) remGuard();
+ o = g.o;
+ if (o) addGuard();
+ }
+ return *this;
+}
+
+template<class T>
+QDeclarativeGuard<T> &QDeclarativeGuard<T>::operator=(T *g)
+{
+ if (g != o) {
+ if (prev) remGuard();
+ o = g;
+ if (o) addGuard();
+ }
+ return *this;
+}
+
+QT_END_NAMESPACE
+
+#endif // QDECLARATIVEGUARD_P_H