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dereferencing C pointer at scheme level

From: Andy Tai
Subject: dereferencing C pointer at scheme level
Date: Sun, 12 May 2024 11:51:17 -0700

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?

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