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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 1.0, 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 are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QSCOPEDPOINTER_H
#define QSCOPEDPOINTER_H
#include <QtCore/qglobal.h>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
QT_MODULE(Core)
template <typename T>
class QScopedPointer
{
public:
explicit inline QScopedPointer(T *p = 0) : d(p)
{
}
inline ~QScopedPointer()
{
delete d;
}
inline T &operator*() const
{
return *d;
}
inline T *operator->() const
{
return d;
}
inline bool operator==(const QScopedPointer<T> &other) const
{
return d == other.d;
}
inline bool operator!=(const QScopedPointer<T> &other) const
{
return d != other.d;
}
inline operator bool() const
{
return d;
}
inline T *data() const
{
return d;
}
inline bool isNull() const
{
return !d;
}
inline void reset(T *other = 0)
{
T *oldD = d;
d = other;
delete oldD;
}
inline T *take()
{
T *oldD = d;
d = 0;
return oldD;
}
protected:
T *d;
private:
Q_DISABLE_COPY(QScopedPointer)
};
/* internal class - allows special handling for resetting and cleaning the pointer */
template <typename T, typename CustomHandler>
class QScopedCustomPointer : public QScopedPointer<T>
{
public:
inline QScopedCustomPointer(T *p = 0)
: QScopedPointer<T>(p)
{
}
inline ~QScopedCustomPointer()
{
T *oldD = this->d;
this->d = 0;
CustomHandler::cleanup(oldD);
}
inline void reset(T *other = 0)
{
CustomHandler::reset(this->d, other);
}
inline T *&data_ptr()
{
return this->d;
}
};
/* Internal helper class - a handler for QShared* classes, to be used in QScopedCustomPointer */
template <typename T>
class QScopedSharedPointerHandler
{
public:
static inline void cleanup(T *d)
{
if (d && !d->ref.deref())
delete d;
}
static inline void reset(T *&d, T *other)
{
T *oldD = d;
d = other;
cleanup(oldD);
}
};
/* Internal. This should really have been a typedef, but you can't have a templated typedef :)
This class is basically a scoped pointer pointing to a ref-counted object
*/
template <typename T>
class QScopedSharedPointer : public QScopedCustomPointer<T, QScopedSharedPointerHandler<T> >
{
public:
inline QScopedSharedPointer(T *p = 0)
: QScopedCustomPointer<T, QScopedSharedPointerHandler<T> >(p)
{
}
inline void detach()
{
qAtomicDetach(this->d);
}
inline void assign(T *other)
{
if (this->d == other)
return;
if (other)
other->ref.ref();
T *oldD = this->d;
this->d = other;
QScopedSharedPointerHandler<T>::cleanup(oldD);
}
};
QT_END_NAMESPACE
QT_END_HEADER
#endif // QSCOPEDPOINTER_H
|
