/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the QtCore module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#ifndef QDECLARATIVEGUARD_P_H+
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#define QDECLARATIVEGUARD_P_H+
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+
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//+
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//  W A R N I N G+
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//  -------------+
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//+
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// This file is not part of the Qt API.  It exists for the convenience+
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// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp.  This header+
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// file may change from version to version without notice, or even be removed.+
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//+
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// We mean it.+
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//+
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+
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#include <QtCore/qglobal.h>+
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#include <QtCore/qvariant.h>+
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+
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QT_BEGIN_NAMESPACE+
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+
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class QObject;+
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template<class T>+
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class QDeclarativeGuard+
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{+
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    QObject *o;+
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    QDeclarativeGuard<QObject> *next;+
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    QDeclarativeGuard<QObject> **prev;+
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    friend class QDeclarativeData;+
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public:+
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    inline QDeclarativeGuard();+
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    inline QDeclarativeGuard(T *);+
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    inline QDeclarativeGuard(const QDeclarativeGuard<T> &);+
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    inline virtual ~QDeclarativeGuard();+
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+
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    inline QDeclarativeGuard<T> &operator=(const QDeclarativeGuard<T> &o);+
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    inline QDeclarativeGuard<T> &operator=(T *);+
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    +
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    inline bool isNull() const+
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        { return !o; }+
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+
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    inline T* operator->() const+
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        { return static_cast<T*>(const_cast<QObject*>(o)); }+
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    inline T& operator*() const+
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        { return *static_cast<T*>(const_cast<QObject*>(o)); }+
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    inline operator T*() const+
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        { return static_cast<T*>(const_cast<QObject*>(o)); }+
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    inline T* data() const+
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        { return static_cast<T*>(const_cast<QObject*>(o)); }+
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+
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protected:+
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    virtual void objectDestroyed(T *) {}+
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+
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private:+
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    inline void addGuard();+
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    inline void remGuard();+
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};+
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+
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QT_END_NAMESPACE+
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+
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Q_DECLARE_METATYPE(QDeclarativeGuard<QObject>)+
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+
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#include "private/qdeclarativedata_p.h"+
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+
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QT_BEGIN_NAMESPACE+
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+
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template<class T>+
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QDeclarativeGuard<T>::QDeclarativeGuard()+
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: o(0), next(0), prev(0)+
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{+
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}+
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+
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template<class T>+
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QDeclarativeGuard<T>::QDeclarativeGuard(T *g)+
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: o(g), next(0), prev(0)+
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{+
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    if (o) addGuard();+
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}+
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+
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template<class T>+
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QDeclarativeGuard<T>::QDeclarativeGuard(const QDeclarativeGuard<T> &g)+
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: o(g.o), next(0), prev(0)+
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{+
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    if (o) addGuard();+
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}+
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+
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template<class T>+
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QDeclarativeGuard<T>::~QDeclarativeGuard()+
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{+
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    if (prev) remGuard();+
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    o = 0;+
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}+
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+
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template<class T>+
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QDeclarativeGuard<T> &QDeclarativeGuard<T>::operator=(const QDeclarativeGuard<T> &g)+
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{+
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    if (g.o != o) {+
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        if (prev) remGuard();+
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        o = g.o;+
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        if (o) addGuard();+
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    }+
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    return *this;+
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}+
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+
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template<class T>+
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QDeclarativeGuard<T> &QDeclarativeGuard<T>::operator=(T *g)+
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{+
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    if (g != o) {+
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        if (prev) remGuard();+
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        o = g;+
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        if (o) addGuard();+
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    }+
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    return *this;+
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}+
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+
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QT_END_NAMESPACE+
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+
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#endif // QDECLARATIVEGUARD_P_H+
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