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/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 https://www.qt.io/terms-conditions. For further
** information use the contact form at https://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.LGPL3 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-3.0.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 (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QT3DRENDER_QABSTRACTFUNCTOR_H
#define QT3DRENDER_QABSTRACTFUNCTOR_H
#include <Qt3DRender/qt3drender_global.h>
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
// This will generate a unique id() function per type
// <=> 1 unique function address per type
template<class T>
struct FunctorType
{
static qintptr id()
{
// The MSVC linker can under some cases optimize all the template
// functions into a single function. The code below is there to ensure
// that the linker won't collapse all these distincts functions into one
static T *t = 0;
return reinterpret_cast<qintptr>(t);
}
};
template<class T>
qintptr functorTypeId()
{
return reinterpret_cast<qintptr>(&FunctorType<T>::id);
}
#define QT3D_FUNCTOR(Class) \
qintptr id() const Q_DECL_OVERRIDE { \
return Qt3DRender::functorTypeId<Class>(); \
}
class QT3DRENDERSHARED_EXPORT QAbstractFunctor
{
public:
virtual ~QAbstractFunctor();
virtual qintptr id() const = 0;
template<class T>
const T *functor_cast(const QAbstractFunctor *other) const
{
if (other->id() == functorTypeId<T>())
return static_cast<const T *>(other);
return Q_NULLPTR;
}
};
} // Qt3D
QT_END_NAMESPACE
#endif // QT3DRENDER_QABSTRACTFUNCTOR_H
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