Re: [Chicken-users] Aliasing a module variable with a variable from the user ?

[Graham Fawcett]

On 3/29/07, minh thu <address@hidden> wrote:
> Hi,
>
> Say I've a module with a bunch of procedures that use a global variable.
> Call it *global*.
>
> Can I use that module and specify that *global* is an alias of *my-global* ?
> (So that every procedures of the above module now work actually on *my-global*.)

It might be cleaner to use parameters instead:

(define *global* (make-parameter #f))

;; set the value:
(*global* *my-global*)   ; or whatever

;; use the value
(print (+ 3 (*global*)))

If you're not familiar with parameters, it's worth a quick read of the
docs (in short, they give you dynamic scoping instead of lexical
scoping).

If you're going to the bother of rewriting all your *global*
references to (*global*) instead, I suppose you could cheat and use
(define-macro (*global*) '*my-global*) instead. But I'd use
parameters.

Graham