"Jörg F. Wittenberger" scripsit:
> Let's try by example:
>
> (define x (make-parameter #f))
>
> Does this:
>
> (x #t)
>
> count as mutation in this respect or is it the way you do a rebind?
That is indeed mutation. You can work around the lack of mutation thus:
(define x (make-parameter (cons #f 'junk)))
Then use (car (x)) to get the value, and (set-car! (x) #t) to change it.
By rebinding, I mean using the "parameterize" macro. If you aren't using
it, you probably shouldn't use parameters, as they have extra costs on
many implementations, notably Chicken.
--
"Why yes, I'm ten percent Jewish on my manager's side." John Cowan
--Connie Francis http://www.ccil.org/~cowan
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