From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Kenichi Handa <handa@ni.aist.go.jp>
Cc: emacs-devel@gnu.org
Subject: Re: (aset UNIBYTE-STRING MULTIBYTE-CHAR)
Date: Wed, 13 Feb 2008 10:33:23 -0500 [thread overview]
Message-ID: <jwvwsp8vpx8.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <E1JP8bP-0004ZO-FJ@etlken.m17n.org> (Kenichi Handa's message of "Wed, 13 Feb 2008 12:48:07 +0900")
> Something like this code:
> (setq result (cons
> (let ((str (make-string 1 0)))
> (aset str 0 (make-char 'japanese-jisx0208 ku ten))
That's truly horrendous code. I see no reason to support it.
> although it's easy to fix it...
Not only it's easy but the result is more efficient/legible/maintainable.
>> aset on strings is fundamentally problematic, so anything that restricts
>> it further is good in my book (my own local Emacs disallows them
>> plainly, and I rarely bump into code that needs it).
> What is the fundamental problem?
The one you're bumping into: multibyte strings are not arrays and
treating them like ones asks for trouble: the performance is not the one
expected, the implementation is complex and ugly, ...
When weighed against the *very* rare cases where aset is used (let
alone the even more rare cases where aset is actually useful and
convenient), the choice is trivial (for me anyway).
Stefan
PS: I see bindat.el uses string-make-unibyte is a similar way to the
place where we recently switched to unibyte-string, except that th
source is an array rather than a list, and I was thinking: wouldn't
it make sense to allow `apply' to take an array of args rather than
a list of args? Especially if it's of the form (apply FUN ARRAY)
since we then could use ARRAY directly without having to copy the args
one by one into a new C array.
next prev parent reply other threads:[~2008-02-13 15:33 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-13 2:36 (aset UNIBYTE-STRING MULTIBYTE-CHAR) Kenichi Handa
2008-02-13 2:49 ` Stefan Monnier
2008-02-13 3:48 ` Kenichi Handa
2008-02-13 15:33 ` Stefan Monnier [this message]
2008-02-13 18:06 ` Stephen J. Turnbull
2008-02-13 19:33 ` Stefan Monnier
2008-02-13 22:49 ` Miles Bader
2008-02-14 1:11 ` Stephen J. Turnbull
2008-02-14 1:17 ` Miles Bader
2008-02-14 1:40 ` Stefan Monnier
2008-02-14 1:49 ` Miles Bader
2008-02-14 18:10 ` Richard Stallman
2008-02-14 22:40 ` David Kastrup
2008-02-15 1:08 ` Stephen J. Turnbull
2008-02-15 1:17 ` Miles Bader
2008-02-15 7:27 ` David Kastrup
2008-02-15 12:58 ` Richard Stallman
2008-02-14 23:37 ` Leo
2008-02-15 12:59 ` Richard Stallman
2008-02-14 4:20 ` Stephen J. Turnbull
2008-02-14 4:42 ` Richard Stallman
2008-02-15 1:39 ` Kenichi Handa
2008-02-15 4:27 ` Stefan Monnier
2008-02-15 8:42 ` Eli Zaretskii
2008-02-15 8:53 ` Miles Bader
2008-02-16 12:55 ` Eli Zaretskii
2008-02-16 5:53 ` Richard Stallman
2008-02-16 14:33 ` Stefan Monnier
2008-02-17 20:29 ` Richard Stallman
2008-02-18 1:15 ` Stefan Monnier
2008-02-18 4:00 ` Kenichi Handa
2008-02-18 17:31 ` Richard Stallman
2008-02-13 22:01 ` Richard Stallman
2008-02-13 23:13 ` Miles Bader
-- strict thread matches above, loose matches on Subject: below --
2008-04-15 7:11 Kenichi Handa
2008-04-15 15:52 ` Stefan Monnier
2008-04-17 1:13 ` Kenichi Handa
2008-05-07 19:31 Harald Hanche-Olsen
2008-05-14 6:54 ` Harald Hanche-Olsen
2008-05-14 12:22 ` Stefan Monnier
2008-05-14 12:50 ` Harald Hanche-Olsen
2008-05-15 1:18 ` Stefan Monnier
2008-05-15 6:11 ` Harald Hanche-Olsen
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
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=jwvwsp8vpx8.fsf-monnier+emacs@gnu.org \
--to=monnier@iro.umontreal.ca \
--cc=emacs-devel@gnu.org \
--cc=handa@ni.aist.go.jp \
/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 external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.