qgsoptionalexpression.h

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/***************************************************************************
  qgsoptionalexpression.h - QgsOptionalExpression
 
 ---------------------
 begin                : 8.9.2016
 copyright            : (C) 2016 by Matthias Kuhn
 email                : matthias@opengis.ch
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
#ifndef QGSOPTIONALEXPRESSION_H
#define QGSOPTIONALEXPRESSION_H
 
#include "qgis_core.h"
#include "qgsexpression.h"
#include "qgsoptional.h"

 
 
class CORE_EXPORT QgsOptionalExpression : public QgsOptional<QgsExpression>
{
  public:
    QgsOptionalExpression() = default;

    QgsOptionalExpression( const QgsExpression &expression );

    QgsOptionalExpression( const QgsExpression &expression, bool enabled );
 

    void writeXml( QDomElement &element ) const;

    void readXml( const QDomElement &element );
};
 
 
#if defined( _MSC_VER )
#ifndef SIP_RUN
template class CORE_EXPORT QgsOptional<QgsExpression>;
#endif
#endif
 
 
#endif // QGSOPTIONALEXPRESSION_H