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Re: symbols and cells
From: |
Pascal J. Bourguignon |
Subject: |
Re: symbols and cells |
Date: |
Thu, 15 May 2014 20:07:59 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) |
Christopher Howard <cmhoward2@alaska.edu> writes:
> I'm still working through the earlier parts of the Elisp
> documentation, but I am curious: How does one define the variable cell
> and function cell for an /uninterned/ symbol? The docs indicate you
> can do this:
>
> (defvar sym (make-symbol "foo"))
>
> But how do you add a function or variable value to foo without
> interning it?
(require 'cl)
(setf (symbol-value sym) 42
(symbol-function sym) (lambda () 33))
(eval sym) --> 42
(eval (list sym)) --> 33
> On a related note, I'm curious about this perverse construction:
>
> (defvar sym1 (lambda (n) (+ 1 n)))
>
> Is it actually possible to call the the lambda somehow?
(funcall sym1 (symbol-value sym)) --> 43
--
__Pascal Bourguignon__
http://www.informatimago.com/
"Le mercure monte ? C'est le moment d'acheter !"
- symbols and cells, Christopher Howard, 2014/05/15
- Re: symbols and cells,
Pascal J. Bourguignon <=