Variant 1:
    if (res == 0) {
       try {
           FinalRelease();
       } catch (...) {
           delete this;
           throw;
       }
        delete this;
    }


Variant 2:
    if (res == 0) {
      std::auto_ptr<SimpleCountedObject> delete_after_throw = this;
      FinalRelease(); // may throw, for example ScriptTest/ExecMode
    }