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Re: modules

From: Andreas Rottmann
Subject: Re: modules
Date: Sun, 21 Mar 2004 15:47:17 +0100
User-agent: Gnus/5.1002 (Gnus v5.10.2) Emacs/21.3 (gnu/linux)

Ian Zimmerman <address@hidden> writes:

> 1/ How can I customize a module during loading?  In Emacs Lisp, 
> I can either:
> a) set a global variable, for instance 
> (setq foo-module:bar 'baz)
> prior to loading a library "foo-module".  If that library itself does
> (defvar foo-module:bar)
> it picks up the value that was previously set.  But in Scheme, set! only
> works on variables that have already been define'd, and a define creates
> a new variable totally unrelated to the existing value.
What exactly do you want to accomplish? The point of modules is to
isolate mostly independent code from each other, and using a global
variable would just prevent that isolation. If you need a global
module setting, you can provide accessor functions:

(define *bar* "The bar")

(define (set-bar! val)
  (set! *bar* val))

(define (get-bar)

Andreas Rottmann         | address@hidden      | address@hidden | address@hidden      | GnuPG Key:
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