making_path
if(m_status1 == making_path && m_src_vertices1.size() > 1 &&
m_status2 == making_path && m_src_vertices2.size() > 1)
m_status1 = making_path;
if(m_status1 == making_path)
m_status2 = making_path;
if(m_status2 == making_path)
m_status = making_path;
if(m_status == making_path)
if(m_status == making_path && m_src_vertices.size() > 1)