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From: Mikael Djurfeldt <djurfeldt@nada.kth.se>
Cc: djurfeldt@nada.kth.se, guile-devel@gnu.org
Subject: Re: How do I really do this?
Date: Sat, 06 Mar 2004 15:50:22 -0500	[thread overview]
Message-ID: <xy7n06tog35.fsf@nada.kth.se> (raw)
In-Reply-To: <40466FAF.3A286BB0@veritas.com> (Bruce Korb's message of "Wed, 03 Mar 2004 15:52:15 -0800")

Bruce Korb <bkorb@veritas.com> writes:

> I would like to be able to associate a value with a string.
> hash functions look perfect, except I can't use them unless
> I have a hash table and there isn't any clear way I've found
> to create hash table entries without having a hash table.
> I've tried:
>
>   (define (string->symbol (function-returning-string))
>           (value-function))
>
> I thought that to be really obvious, but I was wrong.
> If either of these mecanisms are documented somewhere,
> I'd gladly read it.  Meanwhile, can someone send me a hint?

(define t (make-hash-table))
(hash-set! t (function-returning-string) (value-function))

Then you can lookup values again with (hash-ref t <string>).

This is all documented in the Guile refence manual in the info node
'Hash Tables'.

You don't gain anything by trying to piggyback on 'define', because
'define' uses exactly the same hash table internally as that returned
by (make-hash-table).

M


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  parent reply	other threads:[~2004-03-06 20:50 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-03-03 23:52 How do I really do this? Bruce Korb
2004-03-06 12:17 ` Neil Jerram
2004-03-06 17:43   ` Bruce Korb
2004-03-06 18:00     ` Neil Jerram
2004-03-10 21:07       ` Andreas Rottmann
2004-03-10 22:21       ` Carl Witty
2004-03-12 17:18         ` Bruce Korb
2004-03-11 14:54       ` Paul Jarc
2004-03-06 20:50 ` Mikael Djurfeldt [this message]
2004-03-07  1:33   ` Bruce Korb
2004-03-10 23:44   ` Marius Vollmer
2004-03-14  2:54     ` Bruce Korb
2004-03-08  2:27 ` Paul Jarc

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