From: Eli Zaretskii <eliz@gnu.org>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: 12314@debbugs.gnu.org, cyd@gnu.org
Subject: bug#12314: 24.2.50; `add-to-history': use `setq' with `delete'
Date: Mon, 10 Sep 2012 19:24:44 +0300 [thread overview]
Message-ID: <83k3w1lub7.fsf@gnu.org> (raw)
In-Reply-To: <jwv8vcijaqc.fsf-monnier+emacs@gnu.org>
> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: drew.adams@oracle.com, 12314@debbugs.gnu.org, cyd@gnu.org
> Date: Mon, 10 Sep 2012 08:59:26 -0400
>
> > See my other message: I think we are talking about 2 different
> > things. My gripe was only about using the term "destructive
> > modification", which muddies the waters without gaining anything.
>
> I don't know, to me "destructive modification" sounds like a very clear
> term explaining the general kind of danger we're up against (the kind
> that's summarized in Scheme by adding a "!" at the end of the
> identifier).
Alas, the manual itself gives no basis for such an interpretation. It
says (in two different places):
You can modify the CAR and CDR contents of a cons cell with the
primitives `setcar' and `setcdr'. We call these "destructive"
operations because they change existing list structure.
Here are some functions that rearrange lists "destructively" by
modifying the CDRs of their component cons cells. We call these
functions "destructive" because they chew up the original lists passed
to them as arguments, relinking their cons cells to form a new list that
is the returned value.
The only danger I glean from these is the "danger" of assigning any
meaning to the original list.
next prev parent reply other threads:[~2012-09-10 16:24 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-30 23:08 bug#12314: 24.2.50; `add-to-history': use `setq' with `delete' Drew Adams
2012-09-08 14:32 ` Chong Yidong
2012-09-08 14:43 ` Eli Zaretskii
2012-09-08 14:57 ` Drew Adams
2012-09-08 15:20 ` Eli Zaretskii
2012-09-08 15:48 ` Drew Adams
2012-09-08 16:05 ` Eli Zaretskii
2012-09-08 16:19 ` Andreas Schwab
2012-09-08 16:33 ` Eli Zaretskii
2012-09-08 16:50 ` Lars Ingebrigtsen
2012-09-08 16:54 ` Drew Adams
2012-09-08 17:06 ` Andreas Schwab
2012-09-08 16:35 ` Drew Adams
2012-09-08 16:25 ` Drew Adams
2012-09-08 16:32 ` Eli Zaretskii
2012-09-08 16:42 ` Drew Adams
2012-09-08 21:21 ` Eli Zaretskii
2012-09-08 22:26 ` Drew Adams
2012-09-09 3:00 ` Eli Zaretskii
2012-09-09 6:29 ` Drew Adams
2012-09-09 7:53 ` Chong Yidong
2012-09-09 17:25 ` Eli Zaretskii
2012-09-10 11:54 ` Wolfgang Jenkner
2012-09-08 23:11 ` Stefan Monnier
2012-09-09 2:51 ` Eli Zaretskii
2012-09-09 14:44 ` Stefan Monnier
2012-09-09 17:14 ` Eli Zaretskii
2012-09-09 17:35 ` Drew Adams
2012-09-09 18:20 ` Eli Zaretskii
2012-09-09 19:46 ` Drew Adams
2012-09-09 21:37 ` Stefan Monnier
2012-09-10 4:37 ` Eli Zaretskii
2012-09-10 12:59 ` Stefan Monnier
2012-09-10 15:01 ` Stefan Monnier
2012-09-10 15:21 ` Drew Adams
2012-09-10 16:24 ` Eli Zaretskii [this message]
2012-09-09 8:25 ` Dmitry Gutov
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