#define SS_ASSERT_MEM(_obj_,_type_) do {                                                                                       \
     SS_ASSERT_TYPE(_obj_,_type_);                                                                                              \
     if (NULL==ss_pers_deref((ss_pers_t*)_obj_)) SS_ERROR_FMT(TYPE, ("%s should be loadable", #_obj_));                         \
 } while (false)