unofficial mirror of emacs-devel@gnu.org 
 help / color / mirror / code / Atom feed
From: "Stefan Monnier" <monnier+gnu/emacs@RUM.cs.yale.edu>
Cc: Eli Zaretskii <eliz@is.elta.co.il>, emacs-devel@gnu.org
Subject: Re: struct.el -- a package to encode/decode binary data
Date: Thu, 21 Mar 2002 11:58:34 -0500	[thread overview]
Message-ID: <200203211658.g2LGwYK17907@rum.cs.yale.edu> (raw)
In-Reply-To: 5x663qgcfp.fsf@kfs2.cua.dk

> I just tried to measure whether there is any difference, by copying
> between two strings like this:
>   (let ((i (length a)))
>     (while (> i 0)
>       (setq i (1- i))
>       (aset a i (aref b i))))
> 
> a and b are either both multibyte or both unibyte and initialized
> to all NULs.  The difference in time is very small if there is any...

Try it with a initialized to all NULs and b initialized to all
eight-bit-graphic chars.

> > If the string holds non-ASCII text, yes.  But not in your case, where the 
> > ``string'' holds binary data, I think.

This is only true if binary values between 128 and 256 are represented
as a single-byte, but that's not the case in multibyte strings.


	Stefan


_______________________________________________
Emacs-devel mailing list
Emacs-devel@gnu.org
http://mail.gnu.org/mailman/listinfo/emacs-devel


  reply	other threads:[~2002-03-21 16:58 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <Pine.SUN.3.91.1020319133840.17982G-100000@is>
2002-03-19 14:34 ` struct.el -- a package to encode/decode binary data Kim F. Storm
2002-03-19 21:27   ` Thien-Thi Nguyen
2002-03-21  9:04   ` Richard Stallman
2002-03-21 11:15     ` Eli Zaretskii
2002-03-21 13:31       ` Kim F. Storm
2002-03-21 14:56         ` Eli Zaretskii
2002-03-21 15:36           ` Kim F. Storm
2002-03-21 16:58             ` Stefan Monnier [this message]
2002-03-21 19:45               ` Eli Zaretskii
2002-03-22  1:05                 ` Stefan Monnier
2002-03-22 11:04                   ` Eli Zaretskii
2002-03-22  0:37           ` Miles Bader
2002-03-23  2:35           ` Richard Stallman
2002-03-21 16:53         ` Stefan Monnier
2002-03-23  2:36       ` Richard Stallman
2002-03-22  1:30 Kenichi Handa
  -- strict thread matches above, loose matches on Subject: below --
2002-03-22  1:25 Kenichi Handa
2002-03-22  1:27 ` Stefan Monnier
2002-03-18 23:12 Kim F. Storm
2002-03-19  0:25 ` Miles Bader
2002-03-19  7:02 ` Eli Zaretskii
2002-03-19 12:34   ` Stefan Monnier
2002-03-19 14:38     ` Eli Zaretskii
2002-03-19 14:33 ` Luke Gorrie

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=200203211658.g2LGwYK17907@rum.cs.yale.edu \
    --to=monnier+gnu/emacs@rum.cs.yale.edu \
    --cc=eliz@is.elta.co.il \
    --cc=emacs-devel@gnu.org \
    /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).