/// <summary>
/// Points to the first valid item if to null if there is no one
/// </summary>
/// <returns></returns>
public override CGraphEdge Begin()
{
m_it = 0;
m_iterations = 0;
if (m_graph.M_NumberOfEdges > 0)
{
m_currentItem = m_graph.Edge(m_it);
}
else
{
m_currentItem = null;
}
return(m_currentItem);
}