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Re: Req for help on objects and environments
From: |
tomas |
Subject: |
Re: Req for help on objects and environments |
Date: |
Mon, 6 Sep 2004 08:17:53 +0200 |
User-agent: |
Mutt/1.5.3i |
On Fri, Sep 03, 2004 at 07:46:49PM +0100, Andy Wingo wrote:
> Hi Alp,
>
[...]
> Lexical environments are a different beast. You cannot access them with
> r5rs, I don't think. However, with guile you can, although it's
> definitely not documented. I tried to be less hacky with the following
> macro, but define-macro's memoizing behaviour caused guile 1.6 to
> segfault, so I had to use low-level macros:
>
> (define make-environment
> (procedure->syntax
> (lambda (exp env)
> (local-eval `(let* ,(let lp ((in (cdr exp)) (out '()))
> (if (null? in)
> (reverse out)
> (lp (cddr in) (cons
> (list (car in) (cadr in))
> out))))
> (the-environment))
> env))))
Thanks for your insightful post. As a (mostly) lurker and (currently) non-
schemer (shame!) I appreciate this.
Suggestion: Maybe call your macro make-local-environment -- that might help
newbies to keep apart those two beasts better.
Regards
-- tomás