From: Barry Margolin <barmar@alum.mit.edu>
To: help-gnu-emacs@gnu.org
Subject: Re: obarray
Date: Sun, 15 Dec 2013 01:04:31 -0500 [thread overview]
Message-ID: <barmar-1F440F.01043115122013@news.eternal-september.org> (raw)
In-Reply-To: 87wqj6pva0.fsf@nl106-137-194.student.uu.se
In article <87wqj6pva0.fsf@nl106-137-194.student.uu.se>,
Emanuel Berg <embe8573@student.uu.se> wrote:
> Barry Margolin <barmar@alum.mit.edu> writes:
>
> > Values are unrelated to whether a symbol is in the
> > obarray. An uninterned symbol can have a value.
>
> OK.
>
> > (setq uninterned-symbol (make-symbol "foo"))
> > (setf (symbol-value uninterned-symbol) 'bar)
>
> That looks backward. It looks like you are setting the
> value (i.e. data) to 'bar. But `symbol-value' returns
> not only the data for practical purposes, but the
> *place* of the data (and those are the same)?
>
> > This symbol "foo" won't be in the obarray, but it
> > still has a value.
>
> To me, with the defun I wrote in the beginning of this
> thread, I *do* get uninterned-symbol, and that should
> only look in obarray - also, the value seems to be not
> 'bar, but "foo" (?).
uninterned-symbol is an interned symbol. Its *value* is the symbol foo,
which is not interned; foo shouldn't show up in the function you wrote
earlier in the thread; unless you happen to have interned some other
symbol by that name -- it would probably be clearer if I'd done:
(setq uninterned-symbol (make-symbol "something-you-have-never-typed"))
Now try your function and see if something-you-have-never-typed shows up.
The value of the symbol something-you-have-never-typed would then be bar.
--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
next prev parent reply other threads:[~2013-12-15 6:04 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-15 0:54 obarray Emanuel Berg
2013-12-15 1:14 ` obarray Juanma Barranquero
[not found] ` <mailman.9268.1387070101.10748.help-gnu-emacs@gnu.org>
2013-12-15 1:37 ` obarray Emanuel Berg
2013-12-15 1:56 ` obarray Michael Heerdegen
2013-12-15 1:59 ` obarray Juanma Barranquero
[not found] ` <mailman.9271.1387072648.10748.help-gnu-emacs@gnu.org>
2013-12-15 4:17 ` obarray Emanuel Berg
2013-12-15 4:17 ` obarray Barry Margolin
2013-12-15 4:47 ` obarray Michael Heerdegen
2013-12-15 4:55 ` obarray Emanuel Berg
2013-12-15 6:04 ` Barry Margolin [this message]
2013-12-15 17:43 ` obarray Emanuel Berg
2013-12-16 17:44 ` obarray Barry Margolin
2013-12-17 1:47 ` obarray Michael Heerdegen
[not found] ` <mailman.9442.1387244871.10748.help-gnu-emacs@gnu.org>
2013-12-17 2:11 ` obarray Emanuel Berg
2013-12-17 2:55 ` obarray Michael Heerdegen
[not found] ` <mailman.9452.1387248989.10748.help-gnu-emacs@gnu.org>
2013-12-17 3:01 ` obarray Emanuel Berg
2013-12-17 17:32 ` obarray Barry Margolin
2013-12-17 17:42 ` obarray Emanuel Berg
[not found] ` <mailman.9279.1387082898.10748.help-gnu-emacs@gnu.org>
2013-12-15 5:11 ` obarray Emanuel Berg
2013-12-15 5:36 ` obarray Emanuel Berg
2013-12-15 6:17 ` obarray Michael Heerdegen
[not found] ` <mailman.9283.1387088419.10748.help-gnu-emacs@gnu.org>
2013-12-15 17:51 ` obarray Emanuel Berg
2013-12-15 6:15 ` obarray Michael Heerdegen
[not found] ` <mailman.9282.1387088166.10748.help-gnu-emacs@gnu.org>
2013-12-15 17:47 ` obarray Emanuel Berg
2013-12-15 5:58 ` obarray Barry Margolin
2013-12-15 17:28 ` obarray Emanuel Berg
2013-12-17 14:38 ` obarray jack-mac
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