From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Lennart Borgman <lennart.borgman@gmail.com>
Cc: Emacs-Devel devel <emacs-devel@gnu.org>
Subject: Re: Why don't let bound values die?
Date: Sat, 04 Sep 2010 10:46:59 +0200 [thread overview]
Message-ID: <jwvr5h9zyn5.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <AANLkTimvRhTo2hEmF7SeKM8f4UkCp=XJrOxSDz5mHaPY@mail.gmail.com> (Lennart Borgman's message of "Sat, 4 Sep 2010 00:20:24 +0200")
> I think I still do not know exactly what an uninterned symbol is, but
> I guess it is something that can not be looked up, just somehow
> accessed directly. But it still has a name and I wonder why.
Fundamentally symbols are just special kinds of immutable strings.
Obarrays then are special kinds of hash-tables which only map strings
to symbols (whose name has to be the specified string).
A symbol may be placed in only one obarray at any given time (because
of details of the way the obarray-hash-tables are implemented, where the
linked list slots of each hash-bucket are actually stored directly in
the symbol themselves).
Stefan
next prev parent reply other threads:[~2010-09-04 8:46 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-03 18:11 Why don't let bound values die? Lennart Borgman
2010-09-03 21:52 ` Stefan Monnier
2010-09-03 22:20 ` Lennart Borgman
2010-09-04 8:46 ` Stefan Monnier [this message]
2010-09-06 8:25 ` David Kastrup
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