I've been poking at this for over an hour, but I'm just not sure how to get this to work.
I have a foreign object, points to a vector of (C) double-floats:
(defstruct (fnv-double (:constructor make-fnv-double-internal)) (foreign-pointer nil :read-only t) (size 0 :type fixnum :read-only t))
I can create and manipulate it. I need to know how to define (with defcfun) an interface to a C function which expects a vector of double-floats. My attempts have been along the lines of:
(defmethod translate-to-foreign (val (f fnv-double)) (fnv-foreign-pointer f))
and then declaring something like
(defcfun ("foo" :%foo) :double (x fnv-double))
but neither this nor any of the variants I've tried seems to work at all. I think I need to either defctype or define-foreign-type first, but I haven't gotten that to work either. Can anyone suggest how to do this?
Cheers,
rif