From: Neil Jerram <neil@ossau.uklinux.net>
To: Andy Wingo <wingo@pobox.com>
Cc: guile-devel <guile-devel@gnu.org>
Subject: Re: struct and goops questions
Date: Thu, 27 Dec 2007 19:41:59 +0000 [thread overview]
Message-ID: <874pe32ad4.fsf@ossau.uklinux.net> (raw)
In-Reply-To: <87y7btj64n.fsf@pobox.com> (Andy Wingo's message of "Mon, 17 Dec 2007 23:42:00 +0100")
Andy Wingo <wingo@pobox.com> writes:
> Hi all,
>
> I've been looking at structs a bit recently, and goops' use of them. I
> have some questions:
>
> (1) Why are struct free functions part of instances and not vtables? It
> would seem that they are more appropriate on the vtables (of course
> themselves structs), instead of wasting a word per-instance.
>
> (2) Why are structs double cells? It seems that the last two words are
> always zero.
>
> (3) Where does the word "entity" come from? It seems to be a term to
> describe invokable objects like procedures-with-setters or generics or
> something. Quite confusing, and (it seems) completely undocumented.
>
> (4) What, on a class, are the purpose of slots h0 through h7? They seem
> to be unused, and garbage (opaque foo). For example, try doing a
> (slot-ref <class> 'h0) a few times -- it makes guile segfault for me.
>
> I bet Mikael knows :)
I bet he knows too. I can't help explain these things, I'm afraid.
Neil
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prev parent reply other threads:[~2007-12-27 19:41 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-17 22:42 struct and goops questions Andy Wingo
2007-12-27 19:41 ` Neil Jerram [this message]
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