On Mon, Jul 07, 2003 at 07:31:13PM +0100, Alastair Reid wrote: > > > the discussion on ForeignPtrs without finalizers didn't come to a > > conclusion. I specifically need the nullForeignPtr which was easy enough > > with the FFI of GHC 5.04: > > [...] > > do I have to create a dummy C function? > > Yes, create a dummy C function. > (Actually, you could use 'free' since it does nothing if passed NULL.) That's a good tip. Thanks.
> ps Personally, I would use > > Maybe (ForeignPtr a) > > in the places where you are currently using a ForeignPtr which could be null > with 'Just x' being used only when x is not null. Oh, I do indeed. The need for nullForeignPtr arises when a function expects a pointer to some data structure or a null pointer. In this case I cannot make the foreign import have the type (Maybe (ForeignPtr ()) since it's not accepted by the FFI. Thanks, Axel. _______________________________________________ FFI mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/ffi