Re: testing arity

[Jon Wilson]

Thanks, Neil.  Sounds like an excellent answer!
Regards,
Jon

Neil Jerram wrote:
> address@hidden writes:
>
>
> > On Sat, Jul 22, 2006 at 11:19:28AM -0500, Jon Wilson wrote:
> >
> > > Hi,
> > > Is there a good way to determine the number of arguments that a given 
> > > procedure will take?
> >
> > Here's a fishing rod ;-)
> >
> > | address@hidden:~$ guile
> > | guile> (apropos "arity")
> > | (ice-9 session): arity  #<procedure arity (obj)>
> > | guile> (arity apropos)
> > | 1 or more arguments: `rgx', the rest in `options'.
> > | guile> 
>
>
> And if you're not keen on parsing arity's output, see its definition
> in (ice-9 session) for the procedure properties that it queries to
> produce this.
>
>
> > > Also, on an unrelated note, is it possible to define values (as in (lambda 
> > > () (values 1 2)) ) in terms of McCarthy's original seven lisp primitives? 
> > > Or would this question be better asked somewhere else (like c.l.scheme)?
>
>
> Yes, sounds to me like a question for c.l.scheme.
>
> Regards,
>      Neil