[plt-scheme] Stack Object

>>What's the utility of an interface?
>
>
> To support `is-a?' and `implements?' tests that are not necessarily
> tied to implementation inheritance. They're intended to serve the same
> role as Java interfaces, but in dynamic, first-class form.
>

Hi,
I'm not really aware with Java, but let me ask this: Why is print-name
not in the interface of the stack example?

> In particular, being an instance of stack<%> doesn't prevent an object
> from being used more specifically as a named-stack%, just as the #t
> result of `(integer? 4)' doesn't prevent 4 from being used more
> specifically as an integer.
>

I'm sorry, I really didn't understand what this had to do with a method
being an interface or not.

Thanks for your patience,

Best regards,

Paulo

> Matthew
>
>


--
Paulo J. Matos : pocm(_at_)mega.ist.utl.pt
Instituto Superior Tecnico - Lisbon
Software & Computer Engineering - A.I.
  - > http://mega.ist.utl.pt/~pocm
  ---
	Yes, God had a deadline...
		So, He wrote it all in Lisp!