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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QDELETEWATCHER_P_H
#define QDELETEWATCHER_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/qglobal.h>
QT_BEGIN_NAMESPACE
class QDeleteWatchable
{
public:
inline QDeleteWatchable();
inline ~QDeleteWatchable();
private:
friend class QDeleteWatcher;
bool *_w;
};
class QDeleteWatcher {
public:
inline QDeleteWatcher(QDeleteWatchable *data);
inline ~QDeleteWatcher();
inline bool wasDeleted() const;
private:
void *operator new(size_t);
bool *_w;
bool _s;
QDeleteWatchable *m_d;
};
QDeleteWatchable::QDeleteWatchable()
: _w(0)
{
}
QDeleteWatchable::~QDeleteWatchable()
{
if (_w) *_w = true;
}
QDeleteWatcher::QDeleteWatcher(QDeleteWatchable *data)
: _s(false), m_d(data)
{
if (!m_d->_w)
m_d->_w = &_s;
_w = m_d->_w;
}
QDeleteWatcher::~QDeleteWatcher()
{
if (false == *_w && &_s == m_d->_w)
m_d->_w = 0;
}
bool QDeleteWatcher::wasDeleted() const
{
return *_w;
}
QT_END_NAMESPACE
#endif // QDELETEWATCHER_P_H
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