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/****************************************************************************
**
** Copyright (C) 2009 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 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
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