FPTracker::LineFormater Node1 FPTracker::LineFormater - m_numPerLine - m_maxPerLine + LineFormater() + operator()() + toString() Node2 std::ostringstream Node2->Node1 -m_ost Node3 std::basic_ostringstream < char > Node3->Node2 Node4 std::basic_ostream < Char > Node4->Node3 Node5 std::basic_ios< Char > Node5->Node4 Node6 std::ios_base Node6->Node5