* GOOPS class printing
[not found] <Yhaqls3Dj1k2r7dA.ref@spikycactus.com>
@ 2022-02-23 21:43 ` Mike Gran
2022-02-23 21:48 ` Jan Wedekind
2022-02-23 21:55 ` [EXT] " Thompson, David
0 siblings, 2 replies; 3+ messages in thread
From: Mike Gran @ 2022-02-23 21:43 UTC (permalink / raw)
To: guile-user
Hello all-
If I define a GOOPS class like so...
(use-modules (oop goops))
(define-class <foo> ())
<foo>
When it is printed, it has a long hex string in it
$2 = #<<class> <foo> 7fa3d9a5bc80>
Is there a way to change how a class prints itself so that
it does not have a hex string? So that it is just
#<<class> <foo>>
or something similar?
Thanks,
Mike Gran
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: GOOPS class printing
2022-02-23 21:43 ` GOOPS class printing Mike Gran
@ 2022-02-23 21:48 ` Jan Wedekind
2022-02-23 21:55 ` [EXT] " Thompson, David
1 sibling, 0 replies; 3+ messages in thread
From: Jan Wedekind @ 2022-02-23 21:48 UTC (permalink / raw)
To: guile-user, Mike Gran
You can define the write and display methods for a metaclass. Also see my article on inspection and metaclasses:
https://www.wedesoft.de/software/2014/03/02/oop-with-goops/
Kind regards
Jan
On 23 February 2022 21:43:50 GMT, Mike Gran <spk121@yahoo.com> wrote:
>Hello all-
>
>If I define a GOOPS class like so...
>
> (use-modules (oop goops))
> (define-class <foo> ())
> <foo>
>
>When it is printed, it has a long hex string in it
>
> $2 = #<<class> <foo> 7fa3d9a5bc80>
>
>Is there a way to change how a class prints itself so that
>it does not have a hex string? So that it is just
>
> #<<class> <foo>>
>
>or something similar?
>
>Thanks,
>Mike Gran
>
>
--
Diese Nachricht wurde von meinem Android-Gerät mit K-9 Mail gesendet.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [EXT] GOOPS class printing
2022-02-23 21:43 ` GOOPS class printing Mike Gran
2022-02-23 21:48 ` Jan Wedekind
@ 2022-02-23 21:55 ` Thompson, David
1 sibling, 0 replies; 3+ messages in thread
From: Thompson, David @ 2022-02-23 21:55 UTC (permalink / raw)
To: Mike Gran; +Cc: Guile User
Hi Mike,
On Wed, Feb 23, 2022 at 4:44 PM Mike Gran <spk121@yahoo.com> wrote:
>
> Hello all-
>
> If I define a GOOPS class like so...
>
> (use-modules (oop goops))
> (define-class <foo> ())
> <foo>
>
> When it is printed, it has a long hex string in it
>
> $2 = #<<class> <foo> 7fa3d9a5bc80>
>
> Is there a way to change how a class prints itself so that
> it does not have a hex string? So that it is just
>
> #<<class> <foo>>
>
> or something similar?
GOOPS turns several procedures into methods, such as 'write'. I think
I've defined special write methods in the past for this purpose. Here
is a basic and silly example:
scheme@(guile-user)> (define-class <foo> ())
scheme@(guile-user)> (make <foo>)
$33 = #<<foo> 55ddef3b0680>
scheme@(guile-user)> (define-method (write (foo <foo>) port)
(display "hello" port))
scheme@(guile-user)> (make <foo>)
$34 = hello
Hope that helps,
- Dave
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-02-23 21:43 ` GOOPS class printing Mike Gran
2022-02-23 21:48 ` Jan Wedekind
2022-02-23 21:55 ` [EXT] " Thompson, David
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