Agreeing with David, but I like to use
types rather than (). YOu can do this because,
in ghc, you can write:
data Blah
with no rhs, and it is understood to be an 'opaque'
type. Ghc beleives any claims you make about
passing Ptr Blah back and forth to C in your foreign
import declarations <* Grin *>.
As for passing structures back and forth, and
accessing the components, you can do it from Haskell
or from the "c-side"... I can send you a sample of
doing it from haskell if you wish.
Ron
--- David Roundy
On Wed, May 21, 2003 at 04:27:10PM +0100, Bayley, Alistair wrote:
construct a Ptr a? What type should "a" be?).
Unless you actually need to ever access their contents, I'd just define the pointers to be of type Ptr (), essentially like a void * pointer in C. No need to use Storable if they are only ever accessed through C functions (which I would hope would be the case). --
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