bug#4073: 23.1; I am not clear with bit set .

bug#4073: 23.1; I am not clear with bit set .

[waterloo]

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In 2.3.3.4 Meta-Character Syntax of Emacs Lisp Reference, I am not
clear with `2**27' .
A bit has two states.
Does `2**27' mean that there are 27 bits ?

`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. '

Does above para mean:  2**7 bit pluses an ASCII character denotes a
meta character ?
What does the `string' mean ?

Thanks

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/share/emacs/23.1/etc/DEBUG for instructions.


In GNU Emacs 23.1.1 (i686-pc-linux-gnu, GTK+ Version 2.16.1)
 of 2009-07-31 on laptop
Windowing system distributor `The X.Org Foundation', version 11.0.10503000
configured using `configure  '--prefix=/usr' '--build=i686-pc-linux-gnu'
'--host=i686-pc-linux-gnu' '--mandir=/usr/share/man'
'--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc'
'--localstatedir=/var/lib' '--program-suffix=-emacs-23'
'--infodir=/usr/share/info/emacs-23' '--with-sound' '--with-x'
'--without-toolkit-scroll-bars' '--with-gif' '--with-jpeg' '--with-png'
'--with-rsvg' '--with-tiff' '--with-xpm' '--with-xft' '--without-libotf'
'--without-m17n-flt' '--with-x-toolkit=gtk' '--without-hesiod'
'--without-kerberos' '--without-kerberos5' '--with-gpm' '--with-dbus'
'build_alias=i686-pc-linux-gnu' 'host_alias=i686-pc-linux-gnu' 'CFLAGS=-O2
-march=pentium-m -pipe' 'LDFLAGS=-Wl,-O1''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: en_US.UTF-8
  value of $LC_CTYPE: zh_CN.UTF-8
  value of $LC_MESSAGES: en_US.UTF-8
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=SCIM
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Info

Minor modes in effect:
  TeX-source-specials-mode: t
  show-paren-mode: t
  display-time-mode: t
  global-auto-complete-mode: t
  desktop-save-mode: t
  yas/minor-mode: t
  auto-image-file-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t

Recent input:
<down-mouse-1> <mouse-1> <help-echo> <help-echo> <help-echo>
<down-mouse-1> <mouse-1> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <down-mouse-4> <mouse-4> <help-echo>
<help-echo> <menu-bar> <buffer> C-a <down-mouse-4>
<mouse-4> <down-mouse-5> <mouse-5> <down-mouse-4> <mouse-4>
<down-mouse-1> <drag-mouse-1> <down-mouse-1> <mouse-1>
<down-mouse-1> <mouse-1> <down-mouse-1> <mouse-1> <down-mouse-1>
<mouse-movement> <drag-mouse-1> <down-mouse-1> <mouse-1>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <menu-bar> <help-menu> <se
nd-emacs-bug-report>

Recent messages:
Applying style hooks...
Loading /media/bak/latex/auto/_region_.el (source)...done
Applying style hooks... done
Wrote /home/huxpeng/.emacs.desktop.lock
Desktop: 9 buffers restored.
For information about GNU Emacs and the GNU system, type C-h C-a.
Ispell process killed
Starting new Ispell process [default] ...
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bug#4073: marked as done (23.1; I am not clear with bit set .)

[Emacs bug Tracking System]

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Your message dated Thu, 13 Aug 2009 14:10:11 -0400
with message-id <87ws57r3ek.fsf@stupidchicken.com>
and subject line Re: 23.1; I am not clear with bit set .
has caused the Emacs bug report #4073,
regarding 23.1; I am not clear with bit set .
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@emacsbugs.donarmstrong.com
immediately.)


-- 
4073: http://emacsbugs.donarmstrong.com/cgi-bin/bugreport.cgi?bug=4073
Emacs Bug Tracking System
Contact owner@emacsbugs.donarmstrong.com with problems

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In 2.3.3.4 Meta-Character Syntax of Emacs Lisp Reference, I am not
clear with `2**27' .
A bit has two states.
Does `2**27' mean that there are 27 bits ?

`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. '

Does above para mean:  2**7 bit pluses an ASCII character denotes a
meta character ?
What does the `string' mean ?

Thanks

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/share/emacs/23.1/etc/DEBUG for instructions.


In GNU Emacs 23.1.1 (i686-pc-linux-gnu, GTK+ Version 2.16.1)
 of 2009-07-31 on laptop
Windowing system distributor `The X.Org Foundation', version 11.0.10503000
configured using `configure  '--prefix=/usr' '--build=i686-pc-linux-gnu'
'--host=i686-pc-linux-gnu' '--mandir=/usr/share/man'
'--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc'
'--localstatedir=/var/lib' '--program-suffix=-emacs-23'
'--infodir=/usr/share/info/emacs-23' '--with-sound' '--with-x'
'--without-toolkit-scroll-bars' '--with-gif' '--with-jpeg' '--with-png'
'--with-rsvg' '--with-tiff' '--with-xpm' '--with-xft' '--without-libotf'
'--without-m17n-flt' '--with-x-toolkit=gtk' '--without-hesiod'
'--without-kerberos' '--without-kerberos5' '--with-gpm' '--with-dbus'
'build_alias=i686-pc-linux-gnu' 'host_alias=i686-pc-linux-gnu' 'CFLAGS=-O2
-march=pentium-m -pipe' 'LDFLAGS=-Wl,-O1''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: en_US.UTF-8
  value of $LC_CTYPE: zh_CN.UTF-8
  value of $LC_MESSAGES: en_US.UTF-8
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=SCIM
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Info

Minor modes in effect:
  TeX-source-specials-mode: t
  show-paren-mode: t
  display-time-mode: t
  global-auto-complete-mode: t
  desktop-save-mode: t
  yas/minor-mode: t
  auto-image-file-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t

Recent input:
<down-mouse-1> <mouse-1> <help-echo> <help-echo> <help-echo>
<down-mouse-1> <mouse-1> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <down-mouse-4> <mouse-4> <help-echo>
<help-echo> <menu-bar> <buffer> C-a <down-mouse-4>
<mouse-4> <down-mouse-5> <mouse-5> <down-mouse-4> <mouse-4>
<down-mouse-1> <drag-mouse-1> <down-mouse-1> <mouse-1>
<down-mouse-1> <mouse-1> <down-mouse-1> <mouse-1> <down-mouse-1>
<mouse-movement> <drag-mouse-1> <down-mouse-1> <mouse-1>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <menu-bar> <help-menu> <se
nd-emacs-bug-report>

Recent messages:
Applying style hooks...
Loading /media/bak/latex/auto/_region_.el (source)...done
Applying style hooks... done
Wrote /home/huxpeng/.emacs.desktop.lock
Desktop: 9 buffers restored.
For information about GNU Emacs and the GNU system, type C-h C-a.
Ispell process killed
Starting new Ispell process [default] ...
Sorting environment...
Removing duplicates... done

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From: Chong Yidong <cyd@stupidchicken.com>
To: waterloo <waterloo2005@gmail.com>
Cc: 4073-done@emacsbugs.donarmstrong.com
Subject: Re: 23.1; I am not clear with bit set .
Date: Thu, 13 Aug 2009 14:10:11 -0400
Message-ID: <87ws57r3ek.fsf@stupidchicken.com>

> In 2.3.3.4 Meta-Character Syntax of Emacs Lisp Reference, I am not
> clear with `2**27' .
> A bit has two states.
> Does `2**27' mean that there are 27 bits ?

For characters, yes.

> `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. '
>
> Does above para mean: 2**7 bit pluses an ASCII character denotes a
> meta character ?  What does the `string' mean ?

See the Strings of Events node.  This is mostly historical information,
which most Emacs Lisp programmers won't need to care about.