Re: [cffi-devel] About double pointers and C & operator

On Sun, Apr 18, 2010 at 7:17 PM, Alexandre Paes alex.paes@streetdogstudio.com wrote:

(defun release-capture (capture*)   (cffi:with-foreign-object (capture** :long)     (setf (cffi:mem-ref capture** :long)           (cffi:pointer-address capture*))     (%release-capture capture**))) It works but it doesn't feel all that nice, is this the best/correct way of achieving the same as the C code?

You should probably use the pointer type:

(with-foreign-object (capture** :pointer) (setf (cffi:mem-ref capture** :pointer) capture*) (%release-capture capture**))

Enhancing with-foreign-object such that it accepts the same arguments as foreign-alloc is in my wish list. That would help make this example more concise.

HTH,