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Re: [Chicken-users] printer for records other than define-record?
From: |
felix winkelmann |
Subject: |
Re: [Chicken-users] printer for records other than define-record? |
Date: |
Wed, 17 Aug 2005 08:02:51 +0200 |
On 8/16/05, Michael Benfield <address@hidden> wrote:
> define-record-printer seems to only work for records defined with
> define-record, and not with define-record-type or
> define-foreign-record.
It should definitely work for records defined with `define-record-type':
(define-record-type <foo>
(make-foo x y)
foo?
(x get-x)
(y get-y) )
(define-record-printer (<foo> f p)
(display "<a foo>" p) )
(print (make-foo 33 44))
==> "<a foo>"
`define-foreign-record' doesn't create a record structure as such -
it's merely a set of procedures for accessing a C struct.
To print foreign records in a more usable format, one could wrap
them into a (normal) record and define a printer for the wrapper
record.
cheers,
felix