Athena::Callback1Rep< T1 > Node1 Athena::Callback1Rep < T1 > - m_refs + Callback1Rep() + ~Callback1Rep() + call() + equal() + ref() + unref() Node2 Athena::CallbackImpF11 < T1 > - m_function - m_fill_2 + CallbackImpF11() + call() + equal() Node1->Node2