From: ludo@gnu.org (Ludovic Courtès)
To: Klaus Stehle <klaus.stehle@uni-tuebingen.de>
Cc: 11196@debbugs.gnu.org
Subject: bug#11196: missing constructor procedure in new srfi-9 records
Date: Mon, 09 Apr 2012 23:21:09 +0200 [thread overview]
Message-ID: <87bon0a9fe.fsf@gnu.org> (raw)
In-Reply-To: <Pine.LNX.4.61.1204072149420.6107@commlink.zdv.uni-tuebingen.de> (Klaus Stehle's message of "Sat, 7 Apr 2012 21:54:34 +0200 (CEST)")
Hi Klaus,
Klaus Stehle <klaus.stehle@uni-tuebingen.de> skribis:
> (use-modules (srfi srfi-9))
>
> ;; A simple record definition for example
> (define-record-type my-record
> (make-my-record one two)
> my-record?
> (one my-one)
> (two my-two))
>
> ;; "Normal" construction is working well
> (define r1 (make-my-record "1" "2"))
>
> ;; This should also work, but it doesn't!
> (define r2 ((record-constructor my-record) "1" "2"))
> => ERROR
The use of ‘record-constructor’ above relies on a implementation detail
of the SRFI-9 implementation in Guile 1.8–namely, that SRFI-9 records
were implemented in terms of “Guile records” (info "(guile) Records").
In Guile 2.0, SRFI-9 records are no longer “Guile records”, so they no
longer have a “record-type descriptor” attached. Thus,
‘record-constructor’ cannot be used with them.
Since you are using SRFI-9 anyway, I would recommend sticking to the
mechanisms specified by SRFI-9, thus avoiding ‘record-constructor’.
How would it work for you?
Thanks,
Ludo’.
next prev parent reply other threads:[~2012-04-09 21:21 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-07 19:54 bug#11196: missing constructor procedure in new srfi-9 records Klaus Stehle
2012-04-09 21:21 ` Ludovic Courtès [this message]
2012-04-09 22:19 ` Ludovic Courtès
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