* Modifying literal lists in Emacs lisp?
@ 2014-06-13 10:14 Nicolas Petton
2014-06-13 16:01 ` Drew Adams
2014-06-13 20:13 ` Nicolas Richard
0 siblings, 2 replies; 6+ messages in thread
From: Nicolas Petton @ 2014-06-13 10:14 UTC (permalink / raw
To: help-gnu-emacs
Hi,
In Common Lisp one should not modify literal lists because of possible
shared conses.
I was wondering if it is the same in Emacs Lisp, but I couldn't find
anything in the documentattion.
Cheers,
Nico
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Modifying literal lists in Emacs lisp?
[not found] <mailman.3583.1402673918.1147.help-gnu-emacs@gnu.org>
@ 2014-06-13 15:57 ` Barry Margolin
2014-06-13 18:59 ` Stefan Monnier
1 sibling, 0 replies; 6+ messages in thread
From: Barry Margolin @ 2014-06-13 15:57 UTC (permalink / raw
To: help-gnu-emacs
In article <mailman.3583.1402673918.1147.help-gnu-emacs@gnu.org>,
Nicolas Petton <petton.nicolas@gmail.com> wrote:
> Hi,
>
> In Common Lisp one should not modify literal lists because of possible
> shared conses.
>
> I was wondering if it is the same in Emacs Lisp, but I couldn't find
> anything in the documentattion.
Yes, you should not do it for the exact same reason. There have been
many threads in the Emacs newsgroups about the failures that result.
I don't know if it's documented (I've been searching and can't find it
either), but it works essentially the same way as in CL.
--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
^ permalink raw reply [flat|nested] 6+ messages in thread
* RE: Modifying literal lists in Emacs lisp?
2014-06-13 10:14 Nicolas Petton
@ 2014-06-13 16:01 ` Drew Adams
2014-06-13 20:13 ` Nicolas Richard
1 sibling, 0 replies; 6+ messages in thread
From: Drew Adams @ 2014-06-13 16:01 UTC (permalink / raw
To: Nicolas Petton, help-gnu-emacs
> In Common Lisp one should not modify literal lists because of possible
> shared conses.
>
> I was wondering if it is the same in Emacs Lisp, but I couldn't find
> anything in the documentattion.
The same is a good idea in any Lisp.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Modifying literal lists in Emacs lisp?
[not found] <mailman.3583.1402673918.1147.help-gnu-emacs@gnu.org>
2014-06-13 15:57 ` Modifying literal lists in Emacs lisp? Barry Margolin
@ 2014-06-13 18:59 ` Stefan Monnier
1 sibling, 0 replies; 6+ messages in thread
From: Stefan Monnier @ 2014-06-13 18:59 UTC (permalink / raw
To: help-gnu-emacs
> I was wondering if it is the same in Emacs Lisp, but I couldn't find
> anything in the documentattion.
Not only that, but I recommend to avoid modifying conses in general.
Stefan
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Modifying literal lists in Emacs lisp?
2014-06-13 10:14 Nicolas Petton
2014-06-13 16:01 ` Drew Adams
@ 2014-06-13 20:13 ` Nicolas Richard
2014-06-13 22:07 ` Nicolas Petton
1 sibling, 1 reply; 6+ messages in thread
From: Nicolas Richard @ 2014-06-13 20:13 UTC (permalink / raw
To: Nicolas Petton; +Cc: help-gnu-emacs
Nicolas Petton <petton.nicolas@gmail.com> writes:
> I was wondering if it is the same in Emacs Lisp, but I couldn't find
> anything in the documentattion.
See (info "(elisp) Rearrangement") search for "A common pitfall".
--
Nico.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Modifying literal lists in Emacs lisp?
2014-06-13 20:13 ` Nicolas Richard
@ 2014-06-13 22:07 ` Nicolas Petton
0 siblings, 0 replies; 6+ messages in thread
From: Nicolas Petton @ 2014-06-13 22:07 UTC (permalink / raw
To: Nicolas Richard; +Cc: help-gnu-emacs
Thank you all for the clarifications!
Cheers,
Nico
Nicolas Richard writes:
> Nicolas Petton <petton.nicolas@gmail.com> writes:
>> I was wondering if it is the same in Emacs Lisp, but I couldn't find
>> anything in the documentattion.
>
> See (info "(elisp) Rearrangement") search for "A common pitfall".
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2014-06-13 22:07 UTC | newest]
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2014-06-13 15:57 ` Modifying literal lists in Emacs lisp? Barry Margolin
2014-06-13 18:59 ` Stefan Monnier
2014-06-13 10:14 Nicolas Petton
2014-06-13 16:01 ` Drew Adams
2014-06-13 20:13 ` Nicolas Richard
2014-06-13 22:07 ` Nicolas Petton
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