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169 lines
5.1 KiB
169 lines
5.1 KiB
/****************************************************************************
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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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** Commercial Usage
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Nokia.
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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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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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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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#ifndef QPOINTER_H
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#define QPOINTER_H
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#include <QtCore/qobject.h>
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QT_BEGIN_HEADER
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QT_BEGIN_NAMESPACE
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QT_MODULE(Core)
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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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inline bool isNull() const
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{ return !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 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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#if (!defined(Q_CC_SUN) || (__SUNPRO_CC >= 0x580)) // ambiguity between const T * and T *
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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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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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#else
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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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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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#endif
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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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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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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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#if (!defined(Q_CC_SUN) || (__SUNPRO_CC >= 0x580)) // ambiguity between const T * and T *
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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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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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#else
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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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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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#endif
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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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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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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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// 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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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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QT_END_NAMESPACE
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QT_END_HEADER
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#endif // QPOINTER_H
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