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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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial Usage
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QPOINTER_H
+#define QPOINTER_H
+
+#include <QtCore/qobject.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_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)); }
+ inline T* data() const
+ { return static_cast<T*>(const_cast<QObject*>(o)); }
+};
+
+
+#if (!defined(Q_CC_SUN) || (__SUNPRO_CC >= 0x580)) // ambiguity between const T * and T *
+
+template <class T>
+inline bool operator==(const T *o, const QPointer<T> &p)
+{ return o == p.operator->(); }
+
+template<class T>
+inline bool operator==(const QPointer<T> &p, const T *o)
+{ return p.operator->() == o; }
+
+#else
+
+template<class T>
+inline bool operator==(const void *o, const QPointer<T> &p)
+{ return o == p.operator->(); }
+
+template<class T>
+inline bool operator==(const QPointer<T> &p, const void *o)
+{ return p.operator->() == o; }
+
+#endif
+
+template <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->(); }
+
+
+#if (!defined(Q_CC_SUN) || (__SUNPRO_CC >= 0x580)) // ambiguity between const T * and T *
+
+template <class T>
+inline bool operator!=(const T *o, const QPointer<T> &p)
+{ return o != p.operator->(); }
+
+template<class T>
+inline bool operator!= (const QPointer<T> &p, const T *o)
+{ return p.operator->() != o; }
+
+#else
+
+template<class T>
+inline bool operator!= (const void *o, const QPointer<T> &p)
+{ return o != p.operator->(); }
+
+template<class T>
+inline bool operator!= (const QPointer<T> &p, const void *o)
+{ return p.operator->() != o; }
+
+#endif
+
+template <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(); }
+#endif
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QPOINTER_H