Function mpi::ffi::MPI_Type_get_envelope

pub unsafe extern fn MPI_Type_get_envelope(type_: MPI_Datatype,
                                           num_integers: *mut c_int,
                                           num_addresses: *mut c_int,
                                           num_datatypes: *mut c_int,
                                           combiner: *mut c_int)
                                           -> c_int