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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** 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 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 http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QSHAREDDATA_H
#define QSHAREDDATA_H
#include <QtCore/qglobal.h>
#include <QtCore/qatomic.h>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
QT_MODULE(Core)
template <class T> class QSharedDataPointer;
class Q_CORE_EXPORT QSharedData
{
public:
mutable QAtomicInt ref;
inline QSharedData() : ref(0) { }
inline QSharedData(const QSharedData &) : ref(0) { }
private:
// using the assignment operator would lead to corruption in the ref-counting
QSharedData &operator=(const QSharedData &);
};
template <class T> class QSharedDataPointer
{
public:
inline void detach() { if (d && d->ref != 1) detach_helper(); }
inline T &operator*() { detach(); return *d; }
inline const T &operator*() const { return *d; }
inline T *operator->() { detach(); return d; }
inline const T *operator->() const { return d; }
inline operator T *() { detach(); return d; }
inline operator const T *() const { return d; }
inline T *data() { detach(); return d; }
inline const T *data() const { return d; }
inline const T *constData() const { return d; }
inline bool operator==(const QSharedDataPointer<T> &other) const { return d == other.d; }
inline bool operator!=(const QSharedDataPointer<T> &other) const { return d != other.d; }
inline QSharedDataPointer() { d = 0; }
inline ~QSharedDataPointer() { if (d && !d->ref.deref()) delete d; }
explicit QSharedDataPointer(T *data);
inline QSharedDataPointer(const QSharedDataPointer<T> &o) : d(o.d) { if (d) d->ref.ref(); }
inline QSharedDataPointer<T> & operator=(const QSharedDataPointer<T> &o) {
if (o.d != d) {
if (o.d)
o.d->ref.ref();
if (d && !d->ref.deref())
delete d;
d = o.d;
}
return *this;
}
inline QSharedDataPointer &operator=(T *o) {
if (o != d) {
if (o)
o->ref.ref();
if (d && !d->ref.deref())
delete d;
d = o;
}
return *this;
}
inline bool operator!() const { return !d; }
protected:
T *clone();
private:
void detach_helper();
T *d;
};
template <class T> class QExplicitlySharedDataPointer
{
public:
typedef T Type;
inline T &operator*() const { return *d; }
inline T *operator->() { return d; }
inline T *operator->() const { return d; }
inline T *data() const { return d; }
inline const T *constData() const { return d; }
inline void detach() { if (d && d->ref != 1) detach_helper(); }
inline void reset()
{
if(d && !d->ref.deref())
delete d;
d = 0;
}
inline operator bool () const { return d != 0; }
inline bool operator==(const QExplicitlySharedDataPointer<T> &other) const { return d == other.d; }
inline bool operator!=(const QExplicitlySharedDataPointer<T> &other) const { return d != other.d; }
inline bool operator==(const T *ptr) const { return d == ptr; }
inline bool operator!=(const T *ptr) const { return d != ptr; }
inline QExplicitlySharedDataPointer() { d = 0; }
inline ~QExplicitlySharedDataPointer() { if (d && !d->ref.deref()) delete d; }
explicit QExplicitlySharedDataPointer(T *data);
inline QExplicitlySharedDataPointer(const QExplicitlySharedDataPointer<T> &o) : d(o.d) { if (d) d->ref.ref(); }
#ifndef QT_NO_MEMBER_TEMPLATES
template<class X>
inline QExplicitlySharedDataPointer(const QExplicitlySharedDataPointer<X> &o) : d(static_cast<T *>(o.data()))
{
if(d)
d->ref.ref();
}
#endif
inline QExplicitlySharedDataPointer<T> & operator=(const QExplicitlySharedDataPointer<T> &o) {
if (o.d != d) {
if (o.d)
o.d->ref.ref();
if (d && !d->ref.deref())
delete d;
d = o.d;
}
return *this;
}
inline QExplicitlySharedDataPointer &operator=(T *o) {
if (o != d) {
if (o)
o->ref.ref();
if (d && !d->ref.deref())
delete d;
d = o;
}
return *this;
}
inline bool operator!() const { return !d; }
protected:
T *clone();
private:
void detach_helper();
T *d;
};
template <class T>
Q_INLINE_TEMPLATE QSharedDataPointer<T>::QSharedDataPointer(T *adata) : d(adata)
{ if (d) d->ref.ref(); }
template <class T>
Q_INLINE_TEMPLATE T *QSharedDataPointer<T>::clone()
{
return new T(*d);
}
template <class T>
Q_OUTOFLINE_TEMPLATE void QSharedDataPointer<T>::detach_helper()
{
T *x = clone();
x->ref.ref();
if (!d->ref.deref())
delete d;
d = x;
}
template <class T>
Q_INLINE_TEMPLATE T *QExplicitlySharedDataPointer<T>::clone()
{
return new T(*d);
}
template <class T>
Q_OUTOFLINE_TEMPLATE void QExplicitlySharedDataPointer<T>::detach_helper()
{
T *x = clone();
x->ref.ref();
if (!d->ref.deref())
delete d;
d = x;
}
template <class T>
Q_INLINE_TEMPLATE QExplicitlySharedDataPointer<T>::QExplicitlySharedDataPointer(T *adata) : d(adata)
{ if (d) d->ref.ref(); }
QT_END_NAMESPACE
QT_END_HEADER
#endif // QSHAREDDATA_H
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