Re: [Haskell-cafe] Haskell data types and Storable class

On Wed, 18 Jun 2008, Galchin, Vasili wrote:

Hello,

I am reading the FFI spec. Something is unclear to me. Let's assume we have

data A = {b:B, .......}

and

data B ={ .............}

both of which belong to class Storable. In the A instance of Storable I want to do a poke and peek of "b" into and out-of, respectively, B. How do I write the poke and peek function of "b" in the "instance Storable A"?

You will write a Storable instance for B and then just use the class methods 'poke' and 'peek' in the instance for A.