From: Andreas Rottmann <a.rottmann@gmx.at>
Subject: Re: equivalent of "this" in goops?
Date: Thu, 17 Feb 2005 00:07:40 +0100 [thread overview]
Message-ID: <87sm3wt877.fsf@ivanova.rotty.yi.org> (raw)
In-Reply-To: rmi8y5oi3wp.fsf@fnord.ir.bbn.com
Greg Troxel <gdt@ir.bbn.com> writes:
> I'm using guile 1.6.x,and doing network mapping.
>
> In a class representing a node, I want to have a slot with an
> init-thunk, and I would like to call a procedure with the class object
> as an argument. The slot holds a class object which is basically a
> hash table of links in a network, and it needs the node object so it
> can hash on 'other end node id'.
>
> So, I'd like to pass 'this' in c++ terms, and I don't see how to do
> that from reading goops.info. I realize there are issues with the
> class not being fully initialized, and in my case that's safe since
> I'm just storing the object in a variable and not using it until a
> link is added, which doesn't happen during object initialization.
> Thus I realize that what I want to do is vaguely unschemely.
FWICT (not being a GOOPS expert), this is not possible without
extending GOOPS: the init-thunk of a slot is specified at class
creation time, and the earliest time "this" is avaiable is in the
"initialize" generic. However, since the init-thunk is called at
initialization time, "this" would be available at the time it is run,
but there is no way to pass it, since the init-thunk, is, well, a
thunk ;). I could imagine a init-function (name to be argued), which
gets passed all arguments from "initialize" could be a useful
extension.
> My fallback is to initialize the linkset on first use, or after object
> createion, or something like that.
>
Given a GOOPS with this hypothetical extension is far from official
release ;), a workaround is probably the only feasibly short-term
solution (given my assumtion that this is not possible with current
GOOPS).
Cheers, Rotty
--
Andreas Rottmann | Rotty@ICQ | 118634484@ICQ | a.rottmann@gmx.at
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next prev parent reply other threads:[~2005-02-16 23:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-16 21:35 equivalent of "this" in goops? Greg Troxel
2005-02-16 23:07 ` Andreas Rottmann [this message]
2005-02-16 23:43 ` Neil Jerram
2005-02-18 17:42 ` Greg Troxel
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