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//
//  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_PairContainer_H
#define Patternist_PairContainer_H

#include "qexpression_p.h"
#include "qatomictype_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short Base class for expressions that has exactly two operands.
     *
     * @author Frans Englich <frans.englich@nokia.com>
     * @ingroup Patternist_expressions
     */
    class PairContainer : public Expression
    {
    public:
        virtual Expression::List operands() const;
        virtual void setOperands(const Expression::List &operands);
        virtual bool compressOperands(const StaticContext::Ptr &);

    protected:
        PairContainer(const Expression::Ptr &operand1, const Expression::Ptr &operand2);

        Expression::Ptr m_operand1;
        Expression::Ptr m_operand2;
    };
}

QT_END_NAMESPACE

QT_END_HEADER

#endif
