Function mpi::ffi::PMPI_Type_get_envelope

pub unsafe extern fn PMPI_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