From: "Stephen J. Turnbull" <stephen@xemacs.org>
To: David Kastrup <dak@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: Compiling Elisp to a native code with a GCC plugin
Date: Sat, 18 Sep 2010 03:53:27 +0900 [thread overview]
Message-ID: <87hbhoxkuw.fsf@uwakimon.sk.tsukuba.ac.jp> (raw)
In-Reply-To: <87pqwc9tnm.fsf@lola.goethe.zz>
David Kastrup writes:
> > If both the number of chars and bytes agree then they must be of
> > the same multibyteness.
>
> Why?
Actually, there's an exceptional case: if both strings are pure ASCII.
In that case it might be possible that one string is multibyte and the
other unibyte, while the numbers of characters and of bytes are equal.
However, in that case the two strings have the same semantics, so I
would suspect that allowing them to compare equal if their
representations are equal (ignoring multi-byte-ness) is intentional.
The example you gave proves nothing, however. In fact, when that
string is presented by `string-as-multibyte', ?\351 will be converted
to a private space character in Unicode and therefore will have more
than one byte in its representation. Thus the length in bytes of the
string (as multibyte) will be 7 (or maybe more, I forget which private
space naked bytes live in). Here's one way to get byte length of a
string:
(defun string-byte-count (s)
(length (if (string-multibyte-p s) (encode-coding-string s 'utf-8) s)))
next prev parent reply other threads:[~2010-09-17 18:53 UTC|newest]
Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-14 19:12 Compiling Elisp to a native code with a GCC plugin Wojciech Meyer
2010-09-14 19:32 ` Tom Tromey
2010-09-14 19:45 ` Wojciech Meyer
2010-09-14 20:17 ` Lars Magne Ingebrigtsen
2010-09-14 20:52 ` Wojciech Meyer
2010-09-14 20:55 ` Tom Tromey
2010-09-14 21:05 ` Wojciech Meyer
2010-09-14 20:44 ` Tom Tromey
2010-09-14 21:00 ` Wojciech Meyer
2010-09-14 21:16 ` Tom Tromey
2010-09-14 21:29 ` Wojciech Meyer
2010-09-14 21:59 ` Tom Tromey
2010-09-14 22:37 ` Wojciech Meyer
2010-09-14 22:55 ` Tom Tromey
2010-09-14 23:33 ` Wojciech Meyer
2010-09-15 1:38 ` Tom Tromey
2010-09-14 22:49 ` Wojciech Meyer
2010-09-14 23:13 ` Thomas Lord
2010-09-14 23:42 ` Wojciech Meyer
2010-09-15 10:47 ` Leo
2010-09-15 11:41 ` Andreas Schwab
2010-09-15 12:10 ` Wojciech Meyer
2010-09-15 14:07 ` Stefan Monnier
2010-09-15 14:27 ` Helmut Eller
2010-09-15 14:59 ` Stefan Monnier
2010-09-15 15:09 ` Lars Magne Ingebrigtsen
2010-09-15 15:31 ` Andreas Schwab
2010-09-15 15:35 ` Lars Magne Ingebrigtsen
2010-09-15 16:28 ` Andreas Schwab
2010-09-16 16:57 ` Lars Magne Ingebrigtsen
2010-09-15 15:42 ` Stefan Monnier
2010-09-15 15:51 ` Lars Magne Ingebrigtsen
2010-09-15 15:57 ` Leo
2010-09-15 16:01 ` Lars Magne Ingebrigtsen
2010-09-15 16:05 ` David Kastrup
2010-09-15 16:23 ` Leo
2010-09-15 16:37 ` David Kastrup
2010-09-16 16:58 ` Lars Magne Ingebrigtsen
2010-09-16 21:11 ` Andreas Schwab
2010-09-16 23:17 ` Lars Magne Ingebrigtsen
2010-09-17 8:13 ` Eli Zaretskii
2010-09-17 13:17 ` Lars Magne Ingebrigtsen
2010-09-17 13:30 ` Eli Zaretskii
2010-09-17 13:34 ` Lars Magne Ingebrigtsen
2010-09-16 17:35 ` Lars Magne Ingebrigtsen
2010-09-16 2:57 ` Stephen J. Turnbull
2010-09-16 6:54 ` David Kastrup
2010-09-16 8:10 ` Stephen J. Turnbull
2010-09-16 8:31 ` David Kastrup
2010-09-16 17:01 ` Lars Magne Ingebrigtsen
2010-09-17 6:52 ` Stephen J. Turnbull
2010-09-17 13:09 ` Lars Magne Ingebrigtsen
2010-09-17 13:31 ` David Kastrup
2010-09-17 13:39 ` Lars Magne Ingebrigtsen
2010-09-17 13:55 ` David Kastrup
2010-09-17 14:18 ` Lars Magne Ingebrigtsen
2010-09-17 14:57 ` David Kastrup
2010-09-17 15:06 ` Lars Magne Ingebrigtsen
2010-09-17 15:24 ` Lars Magne Ingebrigtsen
2010-09-17 16:11 ` Eli Zaretskii
2010-09-17 16:33 ` David Kastrup
2010-09-17 16:41 ` Andreas Schwab
2010-09-17 17:17 ` David Kastrup
2010-09-17 18:24 ` David Kastrup
2010-09-17 20:30 ` David Kastrup
2010-09-17 20:49 ` Lars Magne Ingebrigtsen
2010-09-18 4:31 ` David Kastrup
2010-09-17 18:53 ` Stephen J. Turnbull [this message]
2010-09-17 20:57 ` Eli Zaretskii
2010-09-18 14:19 ` Stephen J. Turnbull
2010-09-18 15:46 ` Eli Zaretskii
2010-09-18 15:58 ` Stefan Monnier
2010-09-17 17:24 ` Lars Magne Ingebrigtsen
2010-09-17 16:11 ` David Kastrup
2010-09-17 16:18 ` Eli Zaretskii
2010-09-17 16:24 ` Lars Magne Ingebrigtsen
2010-09-17 16:39 ` Eli Zaretskii
2010-09-17 17:30 ` Lars Magne Ingebrigtsen
2010-09-17 18:49 ` Eli Zaretskii
2010-09-17 16:39 ` Eli Zaretskii
2010-09-17 13:49 ` Andreas Schwab
2010-09-17 13:55 ` Lars Magne Ingebrigtsen
2010-09-17 14:31 ` Wojciech Meyer
2010-09-17 14:40 ` Andreas Schwab
2010-09-17 14:47 ` Lars Magne Ingebrigtsen
2010-09-17 15:10 ` Andreas Schwab
2010-09-17 15:16 ` Lars Magne Ingebrigtsen
2010-09-17 15:39 ` Andreas Schwab
2010-09-17 15:42 ` Lars Magne Ingebrigtsen
2010-09-17 16:04 ` Andreas Schwab
2010-09-17 16:14 ` Eli Zaretskii
2010-09-17 19:22 ` James Cloos
2010-09-17 17:40 ` Stephen J. Turnbull
2010-09-17 19:40 ` Lars Magne Ingebrigtsen
2010-09-15 15:46 ` Helmut Eller
2010-09-15 16:28 ` Thomas Lord
2010-09-15 21:04 ` Leo
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