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
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