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/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later 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 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QT3DCORE_QHANDLE_H
#define QT3DCORE_QHANDLE_H
#include <Qt3DCore/qt3dcore_global.h>
#include <QtCore/QDebug>
QT_BEGIN_NAMESPACE
namespace Qt3DCore {
template <typename T, uint INDEXBITS>
class QHandleManager;
template <typename T, uint INDEXBITS = 16>
class QHandle
{
public:
QHandle()
: m_handle(0)
{}
quint32 index() const { return d.m_index; }
quint32 counter() const { return d.m_counter; }
quint32 handle() const { return m_handle; }
bool isNull() const { return !m_handle; }
operator quint32() const { return m_handle; }
static quint32 maxIndex() { return MaxIndex; }
static quint32 maxCounter() { return MaxCounter; }
private:
enum {
// Sizes to use for bit fields
IndexBits = INDEXBITS,
CounterBits = 32 - INDEXBITS - 2, // We use 2 bits for book-keeping in QHandleManager
// Sizes to compare against for asserting dereferences
MaxIndex = (1 << IndexBits) - 1,
MaxCounter = (1 << CounterBits) - 1
};
QHandle(quint32 i, quint32 count)
{
d.m_index = i;
d.m_counter = count;
d.m_unused = 0;
Q_ASSERT(i < MaxIndex);
Q_ASSERT(count < MaxCounter);
}
friend class QHandleManager<T, INDEXBITS>;
struct Data {
quint32 m_index : IndexBits;
quint32 m_counter : CounterBits;
quint32 m_unused : 2;
};
union {
Data d;
quint32 m_handle;
};
};
template <typename T, uint INDEXBITS>
QDebug operator<<(QDebug dbg, const QHandle<T, INDEXBITS> &h)
{
QDebugStateSaver saver(dbg);
QString binNumber = QString::number(h.handle(), 2).rightJustified(32, QChar::fromLatin1('0'));
dbg.nospace() << "index = " << h.index()
<< " magic/counter = " << h.counter()
<< " m_handle = " << h.handle()
<< " = " << binNumber;
return dbg;
}
} // Qt3D
QT_END_NAMESPACE
#endif // QT3DCORE_QRHANDLE_H
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