/****************************************************************************+
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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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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#ifndef QPOINTER_H+
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#define QPOINTER_H+
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+
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#include <QtCore/qobject.h>+
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+
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QT_BEGIN_HEADER+
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+
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QT_BEGIN_NAMESPACE+
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+
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QT_MODULE(Core)+
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+
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template <class T>+
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class QPointer+
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{+
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    QObject *o;+
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public:+
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    inline QPointer() : o(0) {}+
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    inline QPointer(T *p) : o(p)+
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        { QMetaObject::addGuard(&o); }+
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    inline QPointer(const QPointer<T> &p) : o(p.o)+
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        { QMetaObject::addGuard(&o); }+
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    inline ~QPointer()+
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        { QMetaObject::removeGuard(&o); }+
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    inline QPointer<T> &operator=(const QPointer<T> &p)+
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        { if (this != &p) QMetaObject::changeGuard(&o, p.o); return *this; }+
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    inline QPointer<T> &operator=(T* p)+
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        { if (o != p) QMetaObject::changeGuard(&o, p); return *this; }+
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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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+
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+
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#if (!defined(Q_CC_SUN) || (__SUNPRO_CC >= 0x580)) // ambiguity between const T * and T *+
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+
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template <class T>+
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inline bool operator==(const T *o, const QPointer<T> &p)+
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{ return o == p.operator->(); }+
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+
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template<class T>+
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inline bool operator==(const QPointer<T> &p, const T *o)+
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{ return p.operator->() == o; }+
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+
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#else+
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+
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template<class T>+
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inline bool operator==(const void *o, const QPointer<T> &p)+
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{ return o == p.operator->(); }+
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+
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template<class T>+
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inline bool operator==(const QPointer<T> &p, const void *o)+
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{ return p.operator->() == o; }+
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+
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#endif+
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+
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template <class T>+
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inline bool operator==(T *o, const QPointer<T> &p)+
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{ return o == p.operator->(); }+
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+
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template<class T>+
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inline bool operator==(const QPointer<T> &p, T *o)+
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{ return p.operator->() == o; }+
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+
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template<class T>+
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inline bool operator==(const QPointer<T> &p1, const QPointer<T> &p2)+
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{ return p1.operator->() == p2.operator->(); }+
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+
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+
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#if (!defined(Q_CC_SUN) || (__SUNPRO_CC >= 0x580)) // ambiguity between const T * and T *+
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+
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template <class T>+
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inline bool operator!=(const T *o, const QPointer<T> &p)+
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{ return o != p.operator->(); }+
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+
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template<class T>+
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inline bool operator!= (const QPointer<T> &p, const T *o)+
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{ return p.operator->() != o; }+
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+
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#else+
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+
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template<class T>+
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inline bool operator!= (const void *o, const QPointer<T> &p)+
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{ return o != p.operator->(); }+
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+
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template<class T>+
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inline bool operator!= (const QPointer<T> &p, const void *o)+
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{ return p.operator->() != o; }+
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+
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#endif+
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+
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template <class T>+
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inline bool operator!=(T *o, const QPointer<T> &p)+
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{ return o != p.operator->(); }+
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+
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template<class T>+
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inline bool operator!= (const QPointer<T> &p, T *o)+
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{ return p.operator->() != o; }+
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+
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template<class T>+
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inline bool operator!= (const QPointer<T> &p1, const QPointer<T> &p2)+
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{ return p1.operator->() != p2.operator->() ; }+
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+
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// Make MSVC < 1400 (2005) handle "if (NULL == p)" syntax+
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#if defined(Q_CC_MSVC) && (_MSC_VER < 1400)+
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template<class T>+
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inline bool operator== (int i, const QPointer<T> &p)+
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{ Q_ASSERT(i == 0); return !i && p.isNull(); }+
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+
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template<class T>+
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inline bool operator!= (int i, const QPointer<T> &p)+
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{ Q_ASSERT(i == 0); return !i && !p.isNull(); }+
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#endif+
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+
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QT_END_NAMESPACE+
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+
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QT_END_HEADER+
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+
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#endif // QPOINTER_H+
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