[Haskell-beginners] how to convert an array of foreignPtr a into a list of Ptr a

Hello, I am writing some code whcih use FFI. one of my C functions has an array of pointer has imput extern HklBinocularsCube *hkl_binoculars_cube_new(int32_t n_spaces, const HklBinocularsSpace **spaces); from Haskell, I have a list of ForeignPtr so my question how can I have something like withForeignPtr for an array of ForeignPtr [ForeignPtr a] -> ([Ptr a] -> IO b) -> IO b Thanks for your help. Frederic