From: Marius Vollmer <mvo@zagadka.de>
Cc: guile-devel@gnu.org
Subject: Re: typechecking
Date: Thu, 10 Jun 2004 18:22:40 +0200 [thread overview]
Message-ID: <87n03bjsbz.fsf@zagadka.ping.de> (raw)
In-Reply-To: <16569.39703.372961.365613@localhost.localdomain> (Han-Wen Nienhuys's message of "Sun, 30 May 2004 10:28:07 +0200")
Han-Wen Nienhuys <hanwen@xs4all.nl> writes:
> dirk@dirk-herrmanns-seiten.de writes:
>> >>
>> >>
>> >
>> >It would be interesting to see if we could map the Scheme semantics
>> >(true = !SCM_BOOL_F) to C. That would require mapping SCM_BOOL_F to
>> >(void*)0x0. Is this desirable, and does anyone see a possibility for this?
>> >
>> SCM values, where the 3 least significant bits are zero indicate
>> non-immediates. That is, the SCM value can without any modification be
>
> I understand the tag system, so I'm aware of the
> implications. However, I was wondering whether such a change stands a
> chance of being incorporated, if it would work.
I find it quite tempting to make SCM_BOOL_F identical to 0; it will
prevent a lot of bugs. But I do think it is better to not gurantee
anything like this about the SCM type (except that you can assign it
directly).
A properly abstract interface to SCM values is a good thing, even if
it is inconvenient at times.
--
GPG: D5D4E405 - 2F9B BCCC 8527 692A 04E3 331E FAF8 226A D5D4 E405
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next prev parent reply other threads:[~2004-06-10 16:22 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-28 13:04 typechecking Han-Wen Nienhuys
2004-05-10 21:34 ` typechecking Marius Vollmer
2004-05-10 21:47 ` typechecking Dale P. Smith
2004-06-10 16:16 ` typechecking Marius Vollmer
2004-05-10 22:57 ` typechecking Han-Wen Nienhuys
2004-05-15 9:16 ` typechecking Dirk Herrmann
2004-05-16 15:11 ` typechecking Han-Wen Nienhuys
2004-05-17 18:31 ` typechecking Marius Vollmer
2004-05-26 17:40 ` typechecking Han-Wen Nienhuys
2004-05-30 8:40 ` typechecking Dirk Herrmann
2004-05-30 8:28 ` typechecking Han-Wen Nienhuys
2004-05-31 7:05 ` typechecking Dirk Herrmann
2004-06-10 16:22 ` Marius Vollmer [this message]
2004-05-30 14:00 ` typechecking Andy Wingo
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