Dear all, I wonder if anyone knows a good way of giving an unboxed mutable array (e.g. IOUArray) to the C world using the FFI in constant time? (I.e. a conversion to a Ptr.) I presume that an IOUArray is implemented as nothing but a Haskell object that has some information plus a pointer to a "normal" C array. I would like to get to that pointer! I could of course implement my own verion of IOUArray which uses a Ptr inside, but it seems silly to redo all the work that has gone into IOUArray. I have also a feature request for mutable arrays: Is it possible to prove a function like "realloc" which extends the array to a larger size, copying all existing information? Right now, I have to do this myself; I am using a type 'IORef (UArray ..)' which seems kind of silly and unnecessarily inefficient. Regards, /Koen