From: tomas@fabula.de
Cc: Guile Users <guile-user@gnu.org>
Subject: Re: Req for help on objects and environments
Date: Mon, 6 Sep 2004 08:17:53 +0200 [thread overview]
Message-ID: <20040906061753.GA21509@www> (raw)
In-Reply-To: <1094237209.3785.48.camel@lark>
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
_______________________________________________
Guile-user mailing list
Guile-user@gnu.org
http://lists.gnu.org/mailman/listinfo/guile-user
next prev parent reply other threads:[~2004-09-06 6:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-01 8:28 Req for help on objects and environments Alp Öztarhan
2004-09-03 18:46 ` Andy Wingo
2004-09-06 6:17 ` tomas [this message]
2004-09-21 20:47 ` Marius Vollmer
2004-09-22 17:07 ` Andy Wingo
-- strict thread matches above, loose matches on Subject: below --
2004-09-02 11:09 [Fwd: Req for help on objects and environments] Alp Öztarhan
2004-09-02 11:53 ` tomas
2004-09-03 19:10 ` Req for help on objects and environments Andy Wingo
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/guile/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20040906061753.GA21509@www \
--to=tomas@fabula.de \
--cc=guile-user@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).