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Subject: |
24.2.92; Doc: (cl) Equality Predicates: unclear role of `eql' |
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Date: |
Sun, 03 Feb 2013 17:53:33 +0100 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.2.92 (gnu/linux) |
Hello Emacs people,
please read this last paragraph in the manual, node (cl) Equality
Predicates:
,----------------------------------------------------------------------
| Also note that the Common Lisp functions `member' and `assoc' use
| `eql' to compare elements, whereas Emacs Lisp follows the MacLisp
| tradition and uses `equal' for these two functions. In Emacs, use
| `memq' (or `cl-member') and `assq' (or `cl-assoc') to get functions
| which use `eql' for comparisons.
|`----------------------------------------------------------------------
I think the last sentence is wrong or at least damaged, because `memq'
and `assq' use `eq' (not `eql') for comparison (at least, this is what
the doc of these function says).
This is in emacs-24 as well as in trunk.
I created this report after reading under "About equality in Emacs" in
gnu.emacs.help. Pascal Bourguignon mentioned that a prior version said
,----------------------------------------------------------------------
| "In Emacs, use `member*' and `assoc*' to get
| functions which use `eql' for comparisons."
`----------------------------------------------------------------------
Thanks,
Michael
In GNU Emacs 24.2.92.3 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.10)
of 2013-01-30 on drachen
Bzr revision: address@hidden
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
System Description: Debian GNU/Linux 7.0 (wheezy)
Configured using:
`configure '--prefix=/usr/local/built/''
Important settings:
value of $LC_ALL: de_DE.utf8
value of $LC_TIME: C
value of $LANG: de_DE.utf8
locale-coding-system: utf-8-unix
default enable-multibyte-characters: t
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