polimorphic factory & constructor arguments

any one knows how to deal when you need a
polimorphic factory but some sub-factories
need some kind of constructor arguments??
(I mean in cases where product's default constructors
doesn't make any sense).

thanks a lot!

hernan rancati (cesare)

ps: i have some clue to solve the problem using a kind
of generic composite argument (an interface) but doesn't
convince me too much..

> any one knows how to deal when you need a
> polimorphic factory but some sub-factories
> need some kind of constructor arguments??
> (I mean in cases where product's default constructors
> doesn't make any sense).

How are the derived classes being determined and where would
the parameters for the non-default constructors come from?

Once that is known it will be easier to offer a suggestion.

Presumably, the client code using the constructed objects
knows nothing about the derived classes since it's only
knows of the base class.