From: Marcin Borkowski <mbork@mbork.pl>
To: Philipp <p.stephani2@gmail.com>
Cc: Help Gnu Emacs mailing list <help-gnu-emacs@gnu.org>
Subject: Re: Which Elisp types are mutable?
Date: Sat, 05 Jun 2021 13:22:42 +0200 [thread overview]
Message-ID: <874keca73x.fsf@mbork.pl> (raw)
In-Reply-To: <0404DE66-DD17-41F2-B6CC-EC06937CD152@gmail.com>
On 2021-06-03, at 14:11, Philipp <p.stephani2@gmail.com> wrote:
>> Am 03.06.2021 um 06:03 schrieb Marcin Borkowski <mbork@mbork.pl>:
>>
>> Well, the subject says it all. I could find an explicit, comprehensive
>> list of mutable (or immutable) types in the Elisp manual. Is it there
>> somewhere?
>
> Mutability is a property of objects, not types.
> Some objects (numbers) are always immutable, others (markers, buffers, ...) are always mutable. But objects of most "interesting" types (strings, lists, vectors, symbols) can be either mutable or immutable.
> Some time ago, I filed https://debbugs.gnu.org/cgi/bugreport.cgi?bug=43557 to document which objects are mutable, but unfortunately it's not yet fixed.
Thanks. However, I still don't understand. How can a list be
immutable? What about a string? I thought these are _always_ mutable
(although in some cases you must not mutate them, because if you do, bad
things could happen - see e.g. my blog post here:
http://mbork.pl/2016-05-23_Literal_values_and_destructive_functions).
Also, I thought symbols are immutable. Can you provide an example
showing that they aren't?
TIA,
--
Marcin Borkowski
http://mbork.pl
next prev parent reply other threads:[~2021-06-05 11:22 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-03 4:03 Which Elisp types are mutable? Marcin Borkowski
2021-06-03 12:11 ` Philipp
2021-06-05 11:22 ` Marcin Borkowski [this message]
2021-06-05 12:58 ` Philipp
2021-06-05 14:25 ` Stefan Monnier via Users list for the GNU Emacs text editor
2021-07-05 18:40 ` Philipp
2021-07-05 20:19 ` Stefan Monnier
2021-07-05 20:44 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-07-05 20:58 ` Stefan Monnier via Users list for the GNU Emacs text editor
2021-07-05 21:03 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-06-05 19:19 ` Marcin Borkowski
2021-06-05 20:17 ` [External] : " Drew Adams
2021-06-05 20:36 ` Dmitry Gutov
2021-06-06 1:57 ` Drew Adams
2021-07-05 18:41 ` Philipp
2021-07-05 18:48 ` Eli Zaretskii
2021-07-05 18:55 ` tomas
2021-07-05 19:26 ` [External] : " Drew Adams
2021-07-05 19:40 ` tomas
2021-07-05 20:03 ` Drew Adams
2021-07-05 20:12 ` tomas
2021-07-05 20:39 ` Drew Adams
2021-07-05 20:58 ` Emanuel Berg via Users list for the GNU Emacs text editor
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