From: Rob Browning <rlb@defaultvalue.org>
Cc: Lynn Winebarger <owinebar@free-expression.org>,
bitwize@wizards-of-source.org, guile-devel@gnu.org
Subject: Re: How to detect a procedure
Date: Tue, 30 Apr 2002 21:35:40 -0500 [thread overview]
Message-ID: <87ofg0k32b.fsf@raven.i.defaultvalue.org> (raw)
In-Reply-To: <3CCF436E.C4D765DF@pacbell.net> (Bruce Korb's message of "Tue, 30 Apr 2002 18:22:54 -0700")
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?)
--
Rob Browning
rlb @defaultvalue.org, @linuxdevel.com, and @debian.org
Previously @cs.utexas.edu
GPG=1C58 8B2C FB5E 3F64 EA5C 64AE 78FE E5FE F0CB A0AD
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next prev parent reply other threads:[~2002-05-01 2:35 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 [this message]
2002-05-01 2:46 ` Lynn Winebarger
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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