/******************************************************************************** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.**** This file is part of the QtCore module of the Qt Toolkit.**** This file may be used under the terms of the GNU General Public** License version 2.0 as published by the Free Software Foundation** and appearing in the file LICENSE.GPL included in the packaging of** this file.  Please review the following information to ensure GNU** General Public Licensing requirements will be met:** http://www.trolltech.com/products/qt/opensource.html**** If you are unsure which license is appropriate for your use, please** review the following information:** http://www.trolltech.com/products/qt/licensing.html or contact the** sales department at sales@trolltech.com.**** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.******************************************************************************/#ifndef QPOINTER_H#define QPOINTER_H#include <QtCore/qobject.h>QT_BEGIN_HEADERQT_MODULE(Core)template <class T>class QPointer{    QObject *o;public:    inline QPointer() : o(0) {}    inline QPointer(T *p) : o(p)        { QMetaObject::addGuard(&o); }    inline QPointer(const QPointer<T> &p) : o(p.o)        { QMetaObject::addGuard(&o); }    inline ~QPointer()        { QMetaObject::removeGuard(&o); }    inline QPointer<T> &operator=(const QPointer<T> &p)        { if (this != &p) QMetaObject::changeGuard(&o, p.o); return *this; }    inline QPointer<T> &operator=(T* p)        { if (o != p) QMetaObject::changeGuard(&o, p); return *this; }    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)); }};template <class T>inline bool operator==(const T *o, const QPointer<T> &p){ return o == p.operator->(); }#ifndef Q_CC_SUN // ambiguity between const T * and T *template<class T>inline bool operator==(const QPointer<T> &p, const T *o){ return p.operator->() == o; }#endiftemplate <class T>inline bool operator==(T *o, const QPointer<T> &p){ return o == p.operator->(); }template<class T>inline bool operator==(const QPointer<T> &p, T *o){ return p.operator->() == o; }template<class T>inline bool operator==(const QPointer<T> &p1, const QPointer<T> &p2){ return p1.operator->() == p2.operator->(); }template <class T>inline bool operator!=(const T *o, const QPointer<T> &p){ return o != p.operator->(); }#ifndef Q_CC_SUN // ambiguity between const T * and T *template<class T>inline bool operator!= (const QPointer<T> &p, const T *o){ return p.operator->() != o; }#endiftemplate <class T>inline bool operator!=(T *o, const QPointer<T> &p){ return o != p.operator->(); }template<class T>inline bool operator!= (const QPointer<T> &p, T *o){ return p.operator->() != o; }template<class T>inline bool operator!= (const QPointer<T> &p1, const QPointer<T> &p2){ return p1.operator->() != p2.operator->() ; }// Make MSVC < 1400 (2005) handle "if (NULL == p)" syntax#if defined(Q_CC_MSVC) && (_MSC_VER < 1400)template<class T>inline bool operator== (int i, const QPointer<T> &p){ Q_ASSERT(i == 0); return !i && p.isNull(); }template<class T>inline bool operator!= (int i, const QPointer<T> &p){ Q_ASSERT(i == 0); return !i && !p.isNull(); }#endifQT_END_HEADER#endif // QPOINTER_H