From: Han-Wen Nienhuys <hanwen@xs4all.nl>
Cc: guile-devel@gnu.org, Marius Vollmer <mvo@zagadka.de>
Subject: Re: typechecking
Date: Wed, 26 May 2004 19:40:53 +0200 [thread overview]
Message-ID: <16564.54949.13882.819772@localhost.localdomain> (raw)
In-Reply-To: <40A5DFF2.80004@dirk-herrmanns-seiten.de>
dirk@dirk-herrmanns-seiten.de writes:
> >
> > What's the rationale for not allowing direct use in conditional
> > tests?
>
> Code like the following:
>
> void f (SCM obj)
> {
> if (obj) {
> /* do something */
> }
> }
>
> is almost always wrong, since what the user typically wants to check is,
> whether obj is SCM_BOOL_F or not:
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?
--
Han-Wen Nienhuys | hanwen@xs4all.nl | http://www.xs4all.nl/~hanwen
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next prev parent reply other threads:[~2004-05-26 17:40 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 ` Han-Wen Nienhuys [this message]
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 ` typechecking Marius Vollmer
2004-05-30 14:00 ` typechecking Andy Wingo
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