RhodeCode

    static Node nodeFromId(int id) { return Node(id);}

    static Arc arcFromId(int id) { return Arc(id);}

    static Edge edgeFromId(int id) { return Edge(id);}

    Node addNode() {     

      int n = nodes.size();

      nodes.push_back(NodeT());

      nodes[n].first_out = -1;

      return Node(n);

    }

      int n = arcs.size();

      arcs.push_back(ArcT());

      arcs.push_back(ArcT());

      arcs[n].target = u._id;

      arcs[n | 1].target = v._id;

      arcs[n].next_out = nodes[v._id].first_out;

      nodes[v._id].first_out = n;

      arcs[n | 1].next_out = nodes[u._id].first_out;	

      nodes[u._id].first_out = (n | 1);

    ///Add a new node to the graph.

    /// \return the new node.

    ///

    Node addNode() { return Parent::addNode(); }

    ///Add a new edge to the graph.

    ///Add a new edge to the graph with node \c s

    ///and \c t.

    ///\return the new edge.

    Edge addEdge(const Node& s, const Node& t) { 

    }

    ///Clear the graph.

    ///Erase all the nodes and edges from the graph.

    ///

    void clear() {

      Parent::clear();

    }

  public: