Derivar una clase a partir de QList

#ifndef NODERECORDLIST_H
#define NODERECORDLIST_H

#include <QList>
#include <QPoint>
#include "pathfinding/noderecord.h"

class NodeRecordList :public QList <NodeRecord>
{
public:
    NodeRecordList();
    NodeRecord findNode (QPoint node);
};

#endif // NODERECORDLIST_H

#include "noderecordlist.h"

NodeRecordList::NodeRecordList()
{
}

NodeRecord NodeRecordList::findNode(QPoint node){
    NodeRecord record;

    for (int i=0; i < this->size(); i++){
        //if (at(i).node() == node){} //Esto da error

        record.copy(at(i));
        if (record.node() == node) {
            return record;
        }
    }
    return record;
}

    NodeRecordList openNodes;
    NodeRecordList closedNodes;