-void user_ref_add_user_data(Gom_ctxt ctxt, struct user_data* data)
-{
- struct user_ref_number *obj = SAFE_CTXT_CAST(user_ref_number, ctxt);
- if (obj)
- LINK_CHAIN_ELT(user_data, obj->extra, data);
-}
-
-void user_ref_cleanup(struct user_ref_number* refn)