From: Andreas Schwab <schwab@linux-m68k.org>
To: Juanma Barranquero <lekktu@gmail.com>
Cc: Bastien <bzg@gnu.org>, emacs-devel@gnu.org
Subject: Re: Why (substring "abc" 0 4) does not return "abc" instead of an error?
Date: Mon, 16 Jul 2012 09:38:47 +0200 [thread overview]
Message-ID: <m2ipdoyx2w.fsf@igel.home> (raw)
In-Reply-To: <CAAeL0STZCHYtchx4UG9fgTyrpcgPXFuVV=8mgFHzb0ntz3z74w@mail.gmail.com> (Juanma Barranquero's message of "Mon, 16 Jul 2012 02:10:37 +0200")
Juanma Barranquero <lekktu@gmail.com> writes:
> BTW, for unexpected behavior wrt strings, my favourite is this one
> (it's not a bug);
>
> (let ((s "ab") (m 2)) (eq (substring s 0 m) (substring s 0 m))) => nil
> (let ((s "ab") (m 1)) (eq (substring s 0 m) (substring s 0 m))) => nil
> (let ((s "ab") (m 0)) (eq (substring s 0 m) (substring s 0 m))) => t
That's not much different from ("foo" == "foo") in C. Using eq for
comparing non-atoms is seldom useful.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2012-07-16 7:38 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-15 23:15 Why (substring "abc" 0 4) does not return "abc" instead of an error? Bastien
2012-07-15 23:29 ` Juanma Barranquero
2012-07-15 23:59 ` Bastien
2012-07-16 0:10 ` Juanma Barranquero
2012-07-16 7:14 ` Bastien
2012-07-16 16:15 ` Stefan Monnier
2012-07-16 16:22 ` Bastien
2012-07-16 16:46 ` Bastien
2012-07-16 17:57 ` Tassilo Horn
2012-07-16 18:51 ` Lars Magne Ingebrigtsen
2012-07-16 19:30 ` Bastien
2012-07-16 19:30 ` Tassilo Horn
2012-07-16 20:20 ` Pascal J. Bourguignon
2012-07-16 19:25 ` Bastien
2012-07-16 19:43 ` Bastien
2012-07-16 20:19 ` Pascal J. Bourguignon
2012-07-16 20:30 ` Stefan Monnier
2012-07-16 22:28 ` Lennart Borgman
2012-07-16 22:48 ` Bastien
2012-07-16 22:53 ` Lennart Borgman
2012-07-16 7:38 ` Andreas Schwab [this message]
2012-07-16 9:40 ` Juanma Barranquero
-- strict thread matches above, loose matches on Subject: below --
2012-07-16 3:45 Dmitry Gutov
2012-07-16 7:32 ` Bastien
2012-07-16 7:52 ` Thierry Volpiatto
2012-07-16 8:38 ` Bastien
2012-07-16 13:03 ` Dmitry Gutov
2012-07-16 14:32 ` Bastien
2012-07-16 13:10 ` Pascal J. Bourguignon
2012-07-16 14:40 ` Bastien
2012-07-16 15:00 ` Pascal J. Bourguignon
2012-07-16 15:07 ` Lennart Borgman
2012-07-16 15:19 ` Pascal J. Bourguignon
2012-07-16 15:22 ` Bastien
2012-07-16 15:46 ` Bastien
2012-07-16 15:49 ` Bastien
2012-07-16 19:49 ` Thien-Thi Nguyen
2012-07-16 22:32 ` Bastien
2012-07-16 15:56 ` Pascal J. Bourguignon
2012-07-16 16:13 ` Bastien
2012-07-16 19:00 Dmitry Gutov
2012-07-16 19:51 ` Tassilo Horn
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/emacs/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=m2ipdoyx2w.fsf@igel.home \
--to=schwab@linux-m68k.org \
--cc=bzg@gnu.org \
--cc=emacs-devel@gnu.org \
--cc=lekktu@gmail.com \
/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.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/emacs.git
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).