//! In a sense, the path can be treated as a graph, for is has \c NodeIt

   //! In a sense, the path can be treated as a graph, for is has \c NodeIt

   //! and \c EdgeIt with the same usage. These types converts to the \c Node

   //! and \c EdgeIt with the same usage. These types converts to the \c Node

   //! and \c Edge of the original graph.

   //! and \c Edge of the original graph.

   //!

   //!

   //! \todo Thoroughfully check all the range and consistency tests.

   //! \todo Thoroughfully check all the range and consistency tests.

   template<typename Graph>

   template<typename Graph>

   class UndirPath {

   class UndirPath {

   public:

   public:

     /// Edge type of the underlying graph.

     /// Edge type of the underlying graph.

     typedef typename Graph::Edge GraphEdge;

     typedef typename Graph::Edge GraphEdge;