From: Kevin Rodgers <kevin.d.rodgers@gmail.com>
To: bug-gnu-emacs@gnu.org
Subject: bug#8479: 24.0.50; Strange error message upon M-z M-z
Date: Wed, 13 Apr 2011 20:05:40 -0600 [thread overview]
Message-ID: <io5kp7$30b$1@dough.gmane.org> (raw)
In-Reply-To: <E1Q9We3-0005ie-Kl@fencepost.gnu.org>
On 4/12/11 12:00 AM, Eli Zaretskii wrote:
>> From: Kevin Rodgers<kevin.d.rodgers@gmail.com>
>> Date: Mon, 11 Apr 2011 23:15:50 -0600
>>
>> Yes, but why is M-z not a character?
>
> Because the "M-" part sets bits in the area outside the valid range of
> character code points.
This is what I was looking for, in the Meta-Character Syntax section of the
Emacs Lisp manual:
A "meta character" is a character typed with the <META> modifier key.
The integer that represents such a character has the 2**27 bit set. We
use high bits for this and other modifiers to make possible a wide
range of basic character codes.
In a string, the 2**7 bit attached to an ASCII character indicates a
meta character; thus, the meta characters that can fit in a string have
codes in the range from 128 to 255, and are the meta versions of the
ordinary ASCII characters. *Note Strings of Events::, for details
about <META>-handling in strings.
--
Kevin Rodgers
Denver, Colorado, USA
next prev parent reply other threads:[~2011-04-14 2:05 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-11 16:01 bug#8479: 24.0.50; Strange error message upon M-z M-z David Kastrup
2011-04-11 16:56 ` Eli Zaretskii
2011-10-07 6:59 ` Glenn Morris
2011-10-07 12:17 ` Eli Zaretskii
2011-10-08 21:07 ` Glenn Morris
2011-04-11 22:10 ` Andy Moreton
2011-04-12 5:15 ` Kevin Rodgers
2011-04-12 6:00 ` Eli Zaretskii
2011-04-14 2:05 ` Kevin Rodgers [this message]
2011-04-15 1:17 ` Stefan Monnier
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