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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns 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 Technology Preview License Agreement accompanying
** this package.
**
** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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.
#ifndef Patternist_VariableReference_H
#define Patternist_VariableReference_H
#include "qemptycontainer_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
template<typename T> class QList;
namespace QPatternist
{
/**
* @short Baseclass for classes being references to variables.
*
* @author Frans Englich <frans.englich@nokia.com>
* @ingroup Patternist_expressions
*/
class VariableReference : public EmptyContainer
{
public:
typedef QExplicitlySharedDataPointer<VariableReference> Ptr;
typedef QList<VariableReference::Ptr> List;
/**
* Creates a VariableReference.
*
* @param slot must be a valid slot. That is, zero or larger.
*/
VariableReference(const VariableSlotID slot);
/**
* @returns the slot that this reference communicates through.
*
* This is a slot in the DynamicContext. Which one, depends on the
* type, which this VariableReference does not have information about.
* For instance, it could DynamicContext::expressionVariable() or
* DynamicContext::rangeVariable().
*/
inline VariableSlotID slot() const;
/**
* @returns DisableElimination
*/
virtual Properties properties() const;
private:
/**
* The slot. Same as returned by slot().
*
* This variable is not called m_slot, because that creates a weird
* compiler error on hpuxi-acc. See the preprocessor output. EvaluationCache::m_varSlot
* is a similar workaround.
*/
const VariableSlotID m_varSlot;
};
inline VariableSlotID VariableReference::slot() const
{
return m_varSlot;
}
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
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