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   207     | 
   207     | 
   208     void clear() const { graph->clear(); } | 
   208     void clear() const { graph->clear(); } | 
   209       | 
   209       | 
   210     bool forward(const Edge& e) const { return graph->forward(e); } | 
   210     bool forward(const Edge& e) const { return graph->forward(e); } | 
   211     bool backward(const Edge& e) const { return graph->backward(e); } | 
   211     bool backward(const Edge& e) const { return graph->backward(e); } | 
         | 
   212   | 
         | 
   213     int id(const Node& v) const { return graph->id(v); } | 
         | 
   214     int id(const Edge& e) const { return graph->id(e); } | 
   212       | 
   215       | 
   213     Edge opposite(const Edge& e) const { return Edge(graph->opposite(e)); } | 
   216     Edge opposite(const Edge& e) const { return Edge(graph->opposite(e)); } | 
   214   | 
   217   | 
   215     template<typename T> class NodeMap : public Graph::template NodeMap<T> {  | 
   218     template<typename T> class NodeMap : public Graph::template NodeMap<T> {  | 
   216       typedef typename Graph::template NodeMap<T> Parent;  | 
   219       typedef typename Graph::template NodeMap<T> Parent;  |