#include <QtCore/qabstractitemmodel.h>
#ifndef QABSTRACTITEMMODEL_H
class QAbstractItemModel: public QObject{
   /* Some contents are skipped to improve readability */
   public: virtual class QModelIndex index(int row, int column, class QModelIndex const & parent = QModelIndex::QModelIndex()) const = 0;
   /* ... */
};
#endif // QABSTRACTITEMMODEL_H