From: Han-Wen Nienhuys <hanwen@cs.uu.nl>
Cc: Marius Vollmer <mvo@zagadka.ping.de>, guile-devel@gnu.org
Subject: Re: gen gc
Date: Thu, 18 Jul 2002 14:08:10 +0200 [thread overview]
Message-ID: <15670.44970.137101.467470@meddo.cs.uu.nl> (raw)
In-Reply-To: <3D36AFBC.1000206@puremagic.com>
miro@puremagic.com writes:
> >>> SCM_DEFINE (scm_object_address, "object-address", 1, 0, 0,
> >>> (SCM obj),
> >>> "Return an integer that for the lifetime of @var{obj} is uniquely\n"
> >>> "returned by this function for @var{obj}")
> >What if I can't? Memory cells are going to move around. I don't see a
> >way to generate a unique number without making some kind of table for
> >objects subjected to object-address.
> >
> >
> Actually it only says it should be unique, not never-changing. In
> particular,
> all it needs for eq? to grok it is uniqueness. I guess just returning
> the address
> ought to work, no?
It says "for the lifetime of this object".
Anyways, the goops code only uses the address for printing, so it
would safe to return the address. I suggest that the documentation be
changed to
"Return the address of OBJ as an integer. Note that this
address may change between runs due to garbage collection."
--
Han-Wen Nienhuys | hanwen@cs.uu.nl | http://www.cs.uu.nl/~hanwen/
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next prev parent reply other threads:[~2002-07-18 12:08 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-17 21:59 gen gc Han-Wen
2002-07-17 22:54 ` Marius Vollmer
2002-07-17 23:12 ` Han-Wen
2002-07-18 12:08 ` Miroslav Silovic
2002-07-18 12:08 ` Han-Wen Nienhuys [this message]
2002-07-19 3:59 ` Rob Browning
2002-07-19 9:39 ` Han-Wen
2002-07-19 15:40 ` Rob Browning
2002-07-19 19:07 ` Tom Lord
2002-07-19 21:07 ` Han-Wen Nienhuys
2002-07-19 21:32 ` Rob Browning
2002-07-19 22:33 ` Han-Wen
2002-07-19 23:31 ` Rob Browning
2002-07-19 22:58 ` Marius Vollmer
2002-07-18 16:00 ` Dirk Herrmann
2002-07-18 16:21 ` Han-Wen Nienhuys
2002-07-19 22:55 ` Marius Vollmer
2002-07-20 8:06 ` Neil Jerram
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