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// Copyright (C) 2020 Klaralvdalens Datakonsult AB (KDAB).
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QT3DCORE_QHANDLE_P_H
#define QT3DCORE_QHANDLE_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of other Qt classes. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <Qt3DCore/qt3dcore_global.h>
#include <QtCore/QDebug>
#include <QtCore/qhashfunctions.h>
#include <private/qglobal_p.h>
QT_BEGIN_NAMESPACE
namespace Qt3DCore {
template <typename T>
class QHandle
{
public:
struct Data {
union {
quintptr counter;
Data *nextFree;
};
};
QHandle()
: d(nullptr),
counter(0)
{}
QHandle(Data *d)
: d(d),
counter(d->counter)
{
}
QHandle(const QHandle &other)
: d(other.d),
counter(other.counter)
{
}
QHandle &operator=(const QHandle &other)
{
d = other.d;
counter = other.counter;
return *this;
}
inline T *operator->() const;
T *data() const;
quintptr handle() const { return reinterpret_cast<quintptr>(d); }
bool isNull() const { return !d; }
Data *data_ptr() const { return d; }
bool operator==(const QHandle &other) const { return d == other.d && counter == other.counter; }
bool operator!=(const QHandle &other) const { return !operator==(other); }
private:
Data *d;
quintptr counter;
};
template <typename T>
QDebug operator<<(QDebug dbg, const QHandle<T> &h)
{
QDebugStateSaver saver(dbg);
QString binNumber = QString::number(h.handle(), 2).rightJustified(32, QChar::fromLatin1('0'));
dbg.nospace() << " m_handle = " << h.handle()
<< " = " << binNumber;
return dbg;
}
template <typename T>
size_t qHash(const QHandle<T> &h, size_t seed)
{
using QT_PREPEND_NAMESPACE(qHash);
return qHash(h.handle(), seed);
}
template <typename T>
size_t qHash(const QHandle<T> &h)
{
using QT_PREPEND_NAMESPACE(qHash);
return qHash(h.handle());
}
} // Qt3DCore
// simpler than fighting the Q_DECLARE_TYPEINFO macro, use QString as a dummy to get movable semantics
template <typename T>
class QTypeInfo<Qt3DCore::QHandle<T> >
: public QTypeInfoMerger<Qt3DCore::QHandle<T>, QString> {};
QT_END_NAMESPACE
#endif // QT3DCORE_QRHANDLE_H