Well, in this particular case, I showed a non-OO way of handling this, so it's not really a data member of an object, but it can be (in this case, it would be class data.)

The particular point, though, is that extraneous arguments should not be passed through a call chain. Providing an access method is merely one step in a refactoring. Perhaps it's all that's needed. Perhaps a greater refactoring is needed. Who knows? It's much cleaner than tramp data, though.