[cffi-devel] Casting

[christopher melen]

Hi,

I've generated a set of CFFI bindings for FFTW
(http://www.fftw.org). FFTW has its own versions of
malloc and free (fftw_malloc, fftw_free). So for
example, one would do (where fftw_complex is a
specific FFTW type) -

fftw_complex *in;

in = (fftw_complex*) fftw_malloc(sizeof(fftw_complex)
* N);

There is a rudimentary set of SBCL bindings for FFTW
which binds the above in the following way -

(defun fftw-malloc-complex (size)
  (sb-alien:cast
   (fftw::|fftw_malloc| (*
*sizeof-fftw-complex-in-bytes* size))
   (* fftw::|fftw_complex|)))

My question is: how do I cast using CFFI?

Thanks,
Chris


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