From: Thorsten Hater <th@...1.rub.de>
Date: 2009-10-29T02:28:53+09:00
Subject: FFI and pointers

Hello,

I'm playing around with FFI and encountered a problem, I could not solve
till now.
Let's assume I use standard C's malloc in my wrapper:

attach_function :malloc, [:int], :pointer

so far no problem. But what now? The pointer returned is of type void*,
which is of no help, since I need double*, int*  and float*  ...
Is there a type cast mechanism in FFI (or anything similar) or do I have 
to wrap
the original library in another layer of C (alternatively write a helper 
lib...)
Or can I import C's typecasts using FFI itself?

Best regards,
     Thorsten