From: Drew Adams <drew.adams@oracle.com>
To: Marcin Borkowski <mbork@mbork.pl>, Philipp <p.stephani2@gmail.com>
Cc: Help Gnu Emacs mailing list <help-gnu-emacs@gnu.org>
Subject: RE: [External] : Re: Which Elisp types are mutable?
Date: Sat, 5 Jun 2021 20:17:34 +0000 [thread overview]
Message-ID: <SA2PR10MB4474705F68341170DF4EA3C1F33A9@SA2PR10MB4474.namprd10.prod.outlook.com> (raw)
In-Reply-To: <8735tw9l14.fsf@mbork.pl>
> > Symbols are probably a weird case terminology-wise. Here I define "mutable
> symbol" as symbol whose value and function slots can be changed (true for
> most symbols except keywords). However, arguably other definitions are
> possible, depending on whether you see their values and function slots as
> "part of a symbol" or as something they refer to. (The manual doesn't
> specify this.)
>
> Ah, I see. For me, a symbol is one thing, and what is in its
> function/value/properties cells is another.
Do you say the same about a cons cell? Certainly
the container is one thing and what it contains
is another, in one sense. That's true of any kind
of container, from a file to a defstruct.
Mutability of list structure is all about changing
the contents (car, cdr) of cons cells. It has no
other meaning.
Lisp symbols are a kind of object. They have
attributes, including name, value (as a variable),
function definition, and an unlimited slew of
other attributes: their `symbol-properties'.
next prev parent reply other threads:[~2021-06-05 20:17 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
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 ` Drew Adams [this message]
2021-06-05 20:36 ` [External] : " 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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