* no scm_foreign_object_p ?
@ 2021-01-23 18:58 Matt Wette
2021-01-23 19:29 ` olivier.dion--- via General Guile related discussions
0 siblings, 1 reply; 4+ messages in thread
From: Matt Wette @ 2021-01-23 18:58 UTC (permalink / raw)
To: Guile User
I started using foreign objects but want something akin to number?,
string? etc.
Is there something that works here?
I was hoping to see scm_foreign_object_p(type, object).
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: no scm_foreign_object_p ?
2021-01-23 18:58 no scm_foreign_object_p ? Matt Wette
@ 2021-01-23 19:29 ` olivier.dion--- via General Guile related discussions
2021-01-23 20:04 ` divoplade
0 siblings, 1 reply; 4+ messages in thread
From: olivier.dion--- via General Guile related discussions @ 2021-01-23 19:29 UTC (permalink / raw)
To: Matt Wette, Guile User
On Sat, 23 Jan 2021, Matt Wette <matt.wette@gmail.com> wrote:
> I started using foreign objects but want something akin to number?,
> string? etc.
> Is there something that works here?
> I was hoping to see scm_foreign_object_p(type, object).
The only thing I see in the manual is `scm_assert_foreign_object_type`.
For something equivalent in scheme, I guess you could do something like:
----------------------------------------------------------------------
(define (foreign? obj)
(not (or (number? obj)
(string? obj)
(null? obj)
;; and so on..
)))
----------------------------------------------------------------------
I agree that such predicate should be part of the buitlin API.
--
Olivier Dion
PolyMtl
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: no scm_foreign_object_p ?
2021-01-23 19:29 ` olivier.dion--- via General Guile related discussions
@ 2021-01-23 20:04 ` divoplade
2021-01-23 20:52 ` Matt Wette
0 siblings, 1 reply; 4+ messages in thread
From: divoplade @ 2021-01-23 20:04 UTC (permalink / raw)
To: Olivier Dion, Matt Wette, Guile User
Hello,
Le samedi 23 janvier 2021 à 14:29 -0500, olivier.dion--- via General
Guile related discussions a écrit :
> On Sat, 23 Jan 2021, Matt Wette <matt.wette@gmail.com> wrote:
> > I started using foreign objects but want something akin to
> > number?,
> > string? etc.
> > Is there something that works here?
> > I was hoping to see scm_foreign_object_p(type, object).
>
> The only thing I see in the manual is
> `scm_assert_foreign_object_type`.
That's what I noticed too; if you want something finer you need to
write scheme code.
Since foreign pointers are GOOPS objects and foreign pointer types are
classes, maybe the is-a? predicate could work, with the foreign pointer
type as the class?
divoplade
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: no scm_foreign_object_p ?
2021-01-23 20:04 ` divoplade
@ 2021-01-23 20:52 ` Matt Wette
0 siblings, 0 replies; 4+ messages in thread
From: Matt Wette @ 2021-01-23 20:52 UTC (permalink / raw)
To: guile-user
On 1/23/21 12:04 PM, divoplade wrote:
> Hello,
>
> Le samedi 23 janvier 2021 à 14:29 -0500, olivier.dion--- via General
> Guile related discussions a écrit :
>> On Sat, 23 Jan 2021, Matt Wette <matt.wette@gmail.com> wrote:
>>> I started using foreign objects but want something akin to
>>> number?,
>>> string? etc.
>>> Is there something that works here?
>>> I was hoping to see scm_foreign_object_p(type, object).
>> The only thing I see in the manual is
>> `scm_assert_foreign_object_type`.
> That's what I noticed too; if you want something finer you need to
> write scheme code.
>
> Since foreign pointers are GOOPS objects and foreign pointer types are
> classes, maybe the is-a? predicate could work, with the foreign pointer
> type as the class?
>
> divoplade
>
>
GOOPS should not be part of the solution. I'm thinking of punting
foreign-object
and see if using some combination of structs and bytevectors will work
out better.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-01-23 18:58 no scm_foreign_object_p ? Matt Wette
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2021-01-23 20:52 ` Matt Wette
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