Function mpi::ffi::MPI_Unpack

pub unsafe extern fn MPI_Unpack(inbuf: *const c_void,
                                insize: c_int,
                                position: *mut c_int,
                                outbuf: *mut c_void,
                                outcount: c_int,
                                datatype: MPI_Datatype,
                                comm: MPI_Comm)
                                -> c_int