On Tue, 2010-03-02 at 13:19 -0800, Kimberly Wallmark wrote:

I'm working with FFI to make a Haskell DLL that's called by C# code. I understand how to share simple types. I've found reasonable documentation for struct-equivalents. Is there a clean way to share lists, or should I make a linked-list struct and do it manually?

In other words, if I have adder :: CInt -> CInt -> CInt adder x y = (x+y)

then I can use foreign export stdcall adder :: CInt -> CInt -> CInt

and on the other side it behaves like int adder(int a, int b);

I'd like to know what to do if I have squares :: [CInt] -> [CInt] squares = map (^2)

Advice?

--Kim

You have to marshal it from/into C array so: foreign export stdcall squares :: Int -> Ptr CInt -> Ptr CInt -> IO () squares n f t = pokeArray t =<< map (^2) `fmap` peekArray n f Regards