Re: [cffi-devel] problem with translation to foreign types

On Mon, Apr 21, 2008 at 01:54:05PM +0100, Luís Oliveira wrote:

On Mon, Apr 21, 2008 at 12:42 AM, Tamas K Papp tpapp@princeton.edu wrote:

...

(cffi:defctype my-double :double)

(defmethod cffi:translate-to-foreign (value (type (eql 'my-double))) (coerce value 'double-float))

That should be:

• (define-foreign-type my-double-type () () (:actual-type :double) (:simple-parser my-double))

MY-DOUBLE-TYPE

• (defmethod translate-to-foreign (value (type my-double-type)) (coerce value 'double-float))

#<STANDARD-METHOD TRANSLATE-TO-FOREIGN (T MY-DOUBLE-TYPE) {1003370511}>

• (convert-to-foreign 10 'my-double)

10.0d0

Hi Luis,

Thanks for the fast response, it fixed my problem.

Maybe mentioning define-foreign-type in section 5.4 (Foreign Type Translators) of the manual would help. Your example works perfectly, but the define-foreign-type documentation mentions neither :actual-type and :simple-parser.

Tamas