size_t
 ss_prop_get_u(ss_prop_t *prop,          /* property list to be queried */
               const char *name          /* name of queried property */
               )
 {
     SS_ENTER(ss_prop_get_u, size_t);
     size_t      value;
     if (!ss_prop_get(prop, name, H5T_NATIVE_SIZE, &value)) SS_ERROR(FAILED);
  SS_CLEANUP:
     SS_LEAVE(value);
 }