From: "Juanma Barranquero" <lekktu@gmail.com>
To: "Andreas Schwab" <schwab@suse.de>
Cc: Dmitry Antipov <dmantipov@yandex.ru>, emacs-devel@gnu.org
Subject: Re: Using empty_string as the only "" string
Date: Tue, 24 Apr 2007 23:54:00 +0200 [thread overview]
Message-ID: <f7ccd24b0704241454l25f11180qc4ce3e17e749e586@mail.gmail.com> (raw)
In-Reply-To: <je7is1e9me.fsf@sykes.suse.de>
On 4/24/07, Andreas Schwab <schwab@suse.de> wrote:
> In which way is this different from
>
> (eq (cdr '(a)) (cdr '(b))) => t
>
Well, that's non-optional, according to the Emacs Lisp documentation:
"Also, since symbol names are normally unique, if the arguments are
symbols with the same name, they are `eq'."
The doc also says: "For other types (e.g., lists, vectors, strings),
two arguments with the same contents or elements are not necessarily
`eq' to each other: they are `eq' only if they are the same object,
meaning that a change in the contents of one will be reflected by the
same change in the contents of the other."
So, as I said, it is an issue of object identity. I didn't say that
the results above would be "wrong", only surprising, and a noticeable
change in the current behaviour.
Juanma
next prev parent reply other threads:[~2007-04-24 21:54 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-24 16:32 Using empty_string as the only "" string Dmitry Antipov
2007-04-24 17:05 ` Juanma Barranquero
2007-04-24 18:11 ` Andreas Schwab
2007-04-24 18:50 ` Juanma Barranquero
2007-04-24 21:38 ` Andreas Schwab
2007-04-24 21:54 ` Juanma Barranquero [this message]
2007-04-24 22:11 ` Andreas Schwab
2007-04-24 22:54 ` Juanma Barranquero
2007-04-24 21:57 ` David Kastrup
2007-04-24 22:07 ` Lennart Borgman (gmail)
2007-04-24 22:29 ` David Kastrup
2007-04-24 22:35 ` Andreas Schwab
2007-04-25 0:55 ` Kenichi Handa
2007-04-25 9:51 ` Andreas Schwab
2007-04-25 9:58 ` David Kastrup
2007-04-25 10:50 ` Andreas Schwab
2007-04-24 22:40 ` Lennart Borgman (gmail)
2007-04-24 22:12 ` Andreas Schwab
2007-04-24 22:31 ` David Kastrup
2007-04-24 22:56 ` Andreas Schwab
2007-04-24 21:39 ` Miles Bader
2007-04-24 21:45 ` Juanma Barranquero
2007-04-24 22:11 ` Miles Bader
2007-04-24 22:59 ` Juanma Barranquero
2007-04-24 23:37 ` Miles Bader
2007-04-24 23:44 ` Johan Bockgård
2007-04-25 1:47 ` Miles Bader
2007-04-25 14:52 ` Richard Stallman
2007-04-26 15:03 ` Daniel Brockman
2007-04-27 20:40 ` Richard Stallman
2007-04-25 2:05 ` Richard Stallman
2007-04-25 12:00 ` Juanma Barranquero
2007-04-25 2:05 ` Richard Stallman
2007-04-24 17:48 ` Stefan Monnier
2007-04-25 2:05 ` Richard Stallman
2007-04-26 14:24 ` Dmitry Antipov
2007-04-25 2:05 ` Richard Stallman
-- strict thread matches above, loose matches on Subject: below --
2007-04-25 5:38 using " dmantipov
2007-04-25 5:49 ` Miles Bader
2007-04-25 11:50 ` Juanma Barranquero
2007-04-25 11:56 ` Kenichi Handa
2007-04-25 13:22 ` Dmitry Antipov
2007-04-25 16:07 ` Stefan Monnier
2007-04-26 4:23 ` Richard Stallman
2007-04-26 13:03 ` Dmitry Antipov
2007-04-27 6:00 ` Richard Stallman
2007-04-27 10:04 ` Dmitry Antipov
2007-04-27 10:29 ` David Kastrup
2007-04-28 4:06 ` Richard Stallman
2007-04-28 8:54 ` Dmitry Antipov
2007-04-28 18:35 ` Richard Stallman
2007-06-05 15:43 ` Juanma Barranquero
2007-06-05 19:17 ` Richard Stallman
2007-06-05 19:45 ` Juanma Barranquero
2007-06-06 1:17 ` Stefan Monnier
2007-06-06 11:04 ` Juanma Barranquero
2007-06-06 22:09 ` Richard Stallman
2007-06-08 15:49 ` Juanma Barranquero
2007-06-08 19:16 ` Stefan Monnier
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