null-pointer?
pointer?
make-pointer
+ pointer->scm
+ scm->pointer
pointer-address
pointer->bytevector
;; PTR1 == PTR2 <-> (eq? (wrap PTR1) (wrap PTR2)).
(let ((ptr->obj (make-weak-value-hash-table 3000)))
(lambda (ptr)
- (let ((key+value (hash-create-handle! ptr->obj ptr #f)))
- (or (cdr key+value)
- (let ((o (%wrap ptr)))
- (set-cdr! key+value o)
- o))))))
+ ;; XXX: We can't use `hash-create-handle!' +
+ ;; `set-cdr!' here because the former would create a
+ ;; weak-cdr pair but the latter wouldn't register a
+ ;; disappearing link (see `scm_hash_fn_set_x'.)
+ (or (hash-ref ptr->obj ptr)
+ (let ((o (%wrap ptr)))
+ (hash-set! ptr->obj ptr o)
+ o)))))
(set-record-type-printer! type-name print)))))))