#include <QtGui/qsortfilterproxymodel.h>
#ifndef QSORTFILTERPROXYMODEL_H
#ifndef QT_NO_SORTFILTERPROXYMODEL
class QSortFilterProxyModel: public QAbstractProxyModel{
   /* Some contents are skipped to improve readability */
   public: virtual void sort(int column, enum Qt::SortOrder order = Qt::AscendingOrder);
   /* ... */
};
#endif // QT_NO_SORTFILTERPROXYMODEL
#endif // QSORTFILTERPROXYMODEL_H