[R] "Attach" for S4 objects?

[F.Tusell]

When passing a list as an argument to a function, I find it convenient
to attach it in the first line of th function code, then refer to the
components as A, B, etc. rather than as list$A, list$B, etc.

If I pass a S4 class object, is there a way to "attach" it, or do I have
to refer to the slots as object at A, objetc at B, etc.? 

I could always make copies,  

     A <- object at A 
     B <- object at B
     ...

but "object" has many slots, some fairly large, so this seems wasteful.

Thank you.
-- 
Fernando TUSELL                                e-mail:
Departamento de Econometría y Estadística           etptupaf at bs.ehu.es 
Facultad de CC.EE. y Empresariales             Tel:   (+34)94.601.3733
Avenida Lendakari Aguirre, 83                  Fax:   (+34)94.601.3754
E-48015 BILBAO  (Spain)                        Secr:  (+34)94.601.3740