RhodeCode

      /// The directed arc type. It can be converted to the

      /// edge or it should be inherited from the undirected

      public:

        /// Default constructor

        /// Copy constructor.

        ///

        /// Initialize the iterator to be invalid.

        /// Initialize the iterator to be invalid.

        /// ordering of the items.

        bool operator<(Arc) const { return false; }

      };

      /// This iterator goes through each directed arc.