TestClassVectors Node1 TestClassVectors + TestClassVectors() + ~TestClassVectors() + setNonZero() + operator==() + operator!=() + streamOut() Node2 std::vector< std::vector < double > > + elements Node2->Node1 +m_vector_of_vector _of_double Node3 std::vector< std::string > Node3->Node1 +m_vector_of_string Node4 std::string Node4->Node3 +elements Node5 std::basic_string< char > Node5->Node4 Node6 std::vector< double > + elements Node6->Node1 +m_vector_of_double