From: Lynn Winebarger <owinebar@free-expression.org>
Cc: bitwize@wizards-of-source.org, guile-devel@gnu.org
Subject: Re: How to detect a procedure
Date: Tue, 30 Apr 2002 21:46:43 -0500 [thread overview]
Message-ID: <0204302146430M.10649@locke.free-expression.org> (raw)
In-Reply-To: <87ofg0k32b.fsf@raven.i.defaultvalue.org>
On Tuesday 30 April 2002 21:35, Rob Browning wrote:
> Bruce Korb <bkorb@pacbell.net> writes:
>
> > I would like:
> >
> > (defined-as? 'mumble scm_class_procedure)
> >
> > to be equivalent to:
> >
> > (and (defined? 'mumble) (procedure? mumble))
> >
> > but the latter is conceptually simpler. I like simple.
>
> or if you really like the idea of a helper, perhaps (nb: not tested,
> or even carefully checked :>):
>
> (define-macro (defined-as? item predicate)
> `(and (defined? ,item) (,predicate ,item)))
>
> i.e.
>
> (defined-as? 'mumble procedure?)
How about (defined-as procedure? 'mumble)
to keep the predicate clear?
Lynn
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next prev parent reply other threads:[~2002-05-01 2:46 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-28 20:35 How to detect a procedure Bruce Korb
2002-04-29 4:52 ` bitwize
2002-04-29 9:45 ` rm
2002-04-30 0:00 ` Lynn Winebarger
2002-04-30 0:36 ` Bruce Korb
2002-04-30 13:50 ` Rob Browning
2002-05-01 1:22 ` Bruce Korb
2002-05-01 2:35 ` Rob Browning
2002-05-01 2:46 ` Lynn Winebarger [this message]
2002-05-01 3:39 ` Rob Browning
2002-05-01 21:36 ` Bruce Korb
2002-05-01 22:18 ` Neil Jerram
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