#include <QtGui/qiconengineplugin.h>
#ifndef QICONENGINEPLUGIN_H
class QIconEnginePlugin: public QObject, public QIconEngineFactoryInterface{
   /* Some contents are skipped to improve readability */
   public: virtual class QStringList keys() const = 0;
   /* ... */
};
#endif // QICONENGINEPLUGIN_H