From: "Juanma Barranquero" <lekktu@gmail.com>
To: "Drew Adams" <drew.adams@oracle.com>
Cc: Emacs-Devel <emacs-devel@gnu.org>
Subject: Re: constant `e'
Date: Fri, 9 Feb 2007 10:32:09 +0100 [thread overview]
Message-ID: <f7ccd24b0702090132k535abcebke666abcf04582bcb@mail.gmail.com> (raw)
In-Reply-To: <BDEIJAFNGDOAGCJIPKPBMEIOCCAA.drew.adams@oracle.com>
On 2/9/07, Drew Adams <drew.adams@oracle.com> wrote:
> Obviously, renaming `e' now would break existing code, but if others agreed,
> then we might plan to deprecate `e' over time, in favor of a longer name.
I think that would be a good idea, if anything because the risk of
shadowing `e' with a local (unrelated) binding is quite high, and that
could be a difficult bug to spot.
> ;; Careful when editing this file ... typos here will be hard to spot.
> ;; (defconst pi 3.14159265358979323846264338327
> ;; "The value of Pi (3.14159265358979323846264338327...)")
>
> Perhaps that comment dated from some time (?) pre-Emacs 20 when `pi' was
> defined using explicit decimal notation
That's the only reasonable explanation. These comments should be deleted.
> Undefining it and seeing what happens would be one approach... Obviously not
> something to attempt before the release, in any case. ;-)
No :)
I find very curious this change by Stefan:
;; It's too inconvenient to make `e' a constant because it's used as
;; a temporary variable all the time.
(defvar e (exp 1) "The value of e (2.7182818...).")
But
(let ((pi 3.2)) pi) => 3.2
so there's no problem with constants and temporary variables. I think
that must be related to some local patches he mentioned a while ago
for allowing real constants...
Am I right, Stefan, or did I misunderstand this comment in the code?
/L/e/k/t/u
next prev parent reply other threads:[~2007-02-09 9:32 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-09 7:37 constant `e' Drew Adams
2007-02-09 9:32 ` Juanma Barranquero [this message]
2007-02-09 11:24 ` Kim F. Storm
2007-02-09 15:08 ` Stefan Monnier
2007-02-09 15:19 ` Juanma Barranquero
2007-02-09 15:34 ` Stefan Monnier
2007-02-10 17:40 ` Richard Stallman
2007-02-09 18:33 ` Jay Belanger
2007-02-09 18:51 ` Stefan Monnier
2007-02-09 14:23 ` Richard Stallman
2007-02-09 14:32 ` Leo
2007-02-09 23:11 ` Kim F. Storm
2007-02-10 0:16 ` Drew Adams
2007-02-12 18:11 ` Stuart D. Herring
2007-02-10 17:39 ` Richard Stallman
2007-02-09 14:37 ` David Kastrup
2007-02-10 17:39 ` Richard Stallman
2007-02-09 15:33 ` Drew Adams
2007-02-09 16:30 ` Eli Zaretskii
2007-02-09 16:50 ` Drew Adams
2007-02-10 9:49 ` Eli Zaretskii
2007-02-09 23:07 ` Dieter Wilhelm
2007-02-10 17:39 ` Richard Stallman
2007-02-10 18:41 ` Slawomir Nowaczyk
2007-02-10 21:12 ` Dieter Wilhelm
2007-02-10 9:29 ` Kevin Rodgers
2007-02-10 19:13 ` Stefan Monnier
2007-02-10 19:22 ` Lennart Borgman (gmail)
2007-02-10 19:38 ` Stefan Monnier
2007-02-10 20:32 ` Lennart Borgman (gmail)
2007-02-12 5:04 ` Kevin Rodgers
2007-02-12 16:06 ` Drew Adams
2007-02-10 6:27 ` Daniel Brockman
2007-02-10 8:59 ` David Kastrup
2007-02-10 11:35 ` Daniel Brockman
2007-02-10 12:01 ` David Kastrup
2007-02-10 12:42 ` Daniel Brockman
2007-02-10 12:43 ` Alan Mackenzie
2007-02-10 14:33 ` Daniel Brockman
2007-02-10 18:05 ` Alan Mackenzie
2007-02-10 18:29 ` Daniel Brockman
2007-02-12 19:03 ` Stuart D. Herring
2007-02-12 19:57 ` Daniel Brockman
2007-02-10 17:38 ` David Kastrup
2007-02-10 18:15 ` Daniel Brockman
2007-02-12 18:51 ` Stuart D. Herring
2007-02-10 19:05 ` Stefan Monnier
2007-02-10 20:48 ` Daniel Brockman
2007-02-10 21:06 ` Stefan Monnier
2007-02-11 9:42 ` David Kastrup
2007-02-11 17:53 ` Daniel Brockman
2007-02-10 21:34 ` Edward O'Connor
2007-02-12 19:17 ` Stuart D. Herring
2007-02-12 20:37 ` Daniel Brockman
2007-02-12 20:40 ` David Kastrup
2007-02-10 17:41 ` Richard Stallman
2007-02-10 9:02 ` Alan Mackenzie
2007-02-10 9:51 ` Jason Rumney
2007-02-12 18:16 ` Stuart D. Herring
2007-02-10 15:13 ` Juanma Barranquero
2007-02-10 19:12 ` Stefan Monnier
2007-02-11 0:43 ` David Hansen
2007-02-11 1:13 ` Jay Belanger
2007-02-11 1:24 ` Drew Adams
2007-02-10 18:53 ` Chong Yidong
-- strict thread matches above, loose matches on Subject: below --
2007-02-13 2:34 djh
2007-02-13 8:23 ` Werner LEMBERG
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