- list<Track *>::iterator i = find(new_tracks.begin(), new_tracks.end(), &trk);
- if(i!=new_tracks.end())
- new_tracks.erase(i);
+ if(Track *trk = dynamic_cast<Track *>(&obj))
+ {
+ list<Track *>::iterator i = find(new_tracks.begin(), new_tracks.end(), trk);
+ if(i!=new_tracks.end())
+ new_tracks.erase(i);
+ }