From: Nikolaj Schumacher <me@nschum.de>
To: Richard Riley <rileyrgdev@googlemail.com>
Cc: help-gnu-emacs@gnu.org
Subject: Re: Working with constansts
Date: Tue, 12 May 2009 11:44:27 +0200 [thread overview]
Message-ID: <m27i0mfyf8.fsf@nschum.de> (raw)
In-Reply-To: <gu7vj9$j7j$2@news.motzarella.org> (Richard Riley's message of "Mon, 11 May 2009 03:38:49 +0200")
Richard Riley <rileyrgdev@googlemail.com> wrote:
>> Because this would incur overhead on every assignment, as it would have
>> to check whether the variable being assigned was declared as a constant.
>> Since this is so rarely the case, this overhead could be seen as mostly
>> wasted and unnecessary.
>
> I don't know enough about Lisp than I can only assume that in this case
> it can not be detected at compile time IF you compile to byte/p code.
"Thanks" to dynamic scoping it cannot be caught at compile time.
(defconst xxx nil)
(defun change-xxx ()
(setx xxx t)) ;; const or variable?
(let ((xxx nil))
(change-xxx))
regards,
Nikolaj Schumacher
next prev parent reply other threads:[~2009-05-12 9:44 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-10 15:25 Working with constansts Decebal
2009-05-10 16:19 ` Pascal J. Bourguignon
2009-05-10 16:20 ` Richard Riley
2009-05-10 16:33 ` Pascal J. Bourguignon
2009-05-12 10:34 ` Nikolaj Schumacher
2009-05-10 17:02 ` Drew Adams
2009-05-10 17:28 ` Richard Riley
2009-05-11 7:39 ` Tassilo Horn
[not found] ` <mailman.6953.1241976532.31690.help-gnu-emacs@gnu.org>
2009-05-10 18:17 ` Pascal J. Bourguignon
2009-05-11 1:36 ` Richard Riley
2009-05-11 6:29 ` Pascal J. Bourguignon
2009-05-12 10:06 ` Nikolaj Schumacher
[not found] ` <mailman.7056.1242122790.31690.help-gnu-emacs@gnu.org>
2009-05-12 11:54 ` Pascal J. Bourguignon
2009-05-18 10:55 ` Nikolaj Schumacher
[not found] ` <7ceiuuczad.fsf@pbourguignon.informatimago.com>
[not found] ` <mailman.7379.1242644154.31690.help-gnu-emacs@gnu.org>
2009-05-18 12:20 ` Pascal J. Bourguignon
2009-05-18 19:19 ` Nikolaj Schumacher
2009-05-10 18:59 ` Barry Margolin
2009-05-11 1:38 ` Richard Riley
2009-05-12 9:44 ` Nikolaj Schumacher [this message]
[not found] ` <mailman.7052.1242121473.31690.help-gnu-emacs@gnu.org>
2009-05-12 11:43 ` Pascal J. Bourguignon
2009-05-13 4:59 ` Barry Margolin
2009-05-13 13:41 ` Ralf Wachinger
2009-05-13 21:23 ` Barry Margolin
2009-05-11 9:58 ` Thien-Thi Nguyen
[not found] ` <mailman.6988.1242036217.31690.help-gnu-emacs@gnu.org>
2009-05-12 1:31 ` Barry Margolin
2009-05-11 8:27 ` Decebal
2009-05-12 9:46 ` Nikolaj Schumacher
2009-05-10 16:31 ` Drew Adams
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