dereferencing C pointer at scheme level

dereferencing C pointer at scheme level

[Andy Tai]

Hi, a question on access to C pointer in scheme:

if a C function returning a pointer is wrapped and accessed from scheme code,

int64_t * func() {
    int64_t *p = make_new_pointer();
   *p = // something

   return p;
}

in scheme (GNU guile)
(set! p (func))

it is possible to see that p is now a pointer.  How to dereference the
pointer to get the value it points to, in guile, on the scheme side?
Thanks

Re: dereferencing C pointer at scheme level

[Nala Ginrut]

Hi Andy!
Short answer: dereference-pointer

Longer answer: this post may help
https://nalaginrut.com/archives/2015/03/27/do-some-quick-and-dirty-with-guile-ffi

Best regards.

On Mon, May 13, 2024, 06:53 Andy Tai <atai@atai.org> wrote:

> Hi, a question on access to C pointer in scheme:
>
> if a C function returning a pointer is wrapped and accessed from scheme
> code,
>
> int64_t * func() {
>     int64_t *p = make_new_pointer();
>    *p = // something
>
>    return p;
> }
>
> in scheme (GNU guile)
> (set! p (func))
>
> it is possible to see that p is now a pointer.  How to dereference the
> pointer to get the value it points to, in guile, on the scheme side?
> Thanks
>
>