From: Kevin Ryde <user42@zip.com.au>
Cc: guile-devel@gnu.org
Subject: Re: let-keywords?
Date: Tue, 12 Dec 2006 10:35:17 +1100 [thread overview]
Message-ID: <8764cihuq2.fsf@zip.com.au> (raw)
In-Reply-To: <eljtva$h6a$1@sea.gmane.org> (Han-Wen Nienhuys's message of "Mon, 11 Dec 2006 16:37:25 +0100")
Han-Wen Nienhuys <hanwen@xs4all.nl> writes:
>
> I think that ice-9's let-keyword* macro is the thing that I've been
> looking for, but I haven't been able to work out how to use it.
I think it goes like
(let-keywords '(#:foo "hello" #:xyzzy "world") #t
((foo "default for foo")
(bar "default for bar"))
foo => "hello"
bar => "default for bar"
"allow-other-keywords" is whether it's an error to have something
unknown like #:xyzzy in the args.
I think the "let-keywords*" variant allows the default for one
variable to use the value of a previous one.
(let-keywords* '(#:foo 1 #:xyzzy 2) #t
((foo 1)
(bar (+ foo 2)))
foo => 1
bar => 3
Would those help for the manual, or can anyone think of more typical
or clearer samples?
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next prev parent reply other threads:[~2006-12-11 23:35 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-11 15:37 let-keywords? Han-Wen Nienhuys
2006-12-11 23:35 ` Kevin Ryde [this message]
2006-12-11 23:57 ` let-keywords? Han-Wen Nienhuys
2006-12-13 21:28 ` let-keywords? Kevin Ryde
2006-12-14 11:20 ` let-keywords? Han-Wen Nienhuys
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