Re: [Haskell-beginners] FFI foreignPtr construction

Thanks for your help I end up with this code which I find quite elegant :) -- data Geometry data HklGeometry newtype Geometry = Geometry (ForeignPtr HklGeometry) deriving (Show) newGeometry :: Factory -> IO Geometry newGeometry f = Geometry <$> (c_hkl_factory_create_new_geometry f >>= newForeignPtr c_hkl_geometry_free) foreign import ccall unsafe "hkl.h hkl_factory_create_new_geometry" c_hkl_factory_create_new_geometry :: Factory -> IO (Ptr HklGeometry) foreign import ccall unsafe "hkl.h &hkl_geometry_free" c_hkl_geometry_free :: FunPtr (Ptr HklGeometry -> IO ()) Cheers Frederic