diff -r d9691d0102bd -r 6e6db1c49bc1 src/work/marci/graph_wrapper.h
--- a/src/work/marci/graph_wrapper.h	Thu Apr 08 13:11:58 2004 +0000
+++ b/src/work/marci/graph_wrapper.h	Tue Apr 13 20:35:47 2004 +0000
@@ -6,156 +6,6 @@
 
 namespace hugo {
 
-//   template<typename Graph>
-//   class TrivGraphWrapper {
-//   protected:
-//     Graph* graph;
-  
-//   public:
-// //    typedef Graph BaseGraph;
-//     typedef Graph ParentGraph;
-
-// //     TrivGraphWrapper() : graph(0) { }
-//     TrivGraphWrapper(Graph& _graph) : graph(&_graph) { }
-// //     void setGraph(Graph& _graph) { graph = &_graph; }
-// //     Graph& getGraph() const { return *graph; }
-
-//     typedef typename Graph::Node Node;
-//     class NodeIt : public Graph::NodeIt { 
-//     public:
-//       NodeIt() { }
-//       NodeIt(const typename Graph::NodeIt& n) : Graph::NodeIt(n) { }
-//       NodeIt(const Invalid& i) : Graph::NodeIt(i) { }
-//       NodeIt(const TrivGraphWrapper<Graph>& _G) : 
-// 	Graph::NodeIt(*(_G.graph)) { }
-//     };
-//     typedef typename Graph::Edge Edge;
-//     class OutEdgeIt : public Graph::OutEdgeIt { 
-//     public:
-//       OutEdgeIt() { }
-//       OutEdgeIt(const typename Graph::OutEdgeIt& e) : Graph::OutEdgeIt(e) { }
-//       OutEdgeIt(const Invalid& i) : Graph::OutEdgeIt(i) { }
-//       OutEdgeIt(const TrivGraphWrapper<Graph>& _G, const Node& n) : 
-// 	Graph::OutEdgeIt(*(_G.graph), n) { }
-//     };
-//     class InEdgeIt : public Graph::InEdgeIt { 
-//     public:
-//       InEdgeIt() { }
-//       InEdgeIt(const typename Graph::InEdgeIt& e) : Graph::InEdgeIt(e) { }
-//       InEdgeIt(const Invalid& i) : Graph::InEdgeIt(i) { }
-//       InEdgeIt(const TrivGraphWrapper<Graph>& _G, const Node& n) : 
-// 	Graph::InEdgeIt(*(_G.graph), n) { }
-//     };
-//     //typedef typename Graph::SymEdgeIt SymEdgeIt;
-//     class EdgeIt : public Graph::EdgeIt { 
-//     public:
-//       EdgeIt() { }
-//       EdgeIt(const typename Graph::EdgeIt& e) : Graph::EdgeIt(e) { }
-//       EdgeIt(const Invalid& i) : Graph::EdgeIt(i) { }
-//       EdgeIt(const TrivGraphWrapper<Graph>& _G) : 
-// 	Graph::EdgeIt(*(_G.graph)) { }
-//     };
-
-//     NodeIt& first(NodeIt& i) const { 
-//       i=NodeIt(*this);
-//       return i;
-//     }
-//     OutEdgeIt& first(OutEdgeIt& i, const Node& p) const { 
-//       i=OutEdgeIt(*this, p);
-//       return i;
-//     }
-//     InEdgeIt& first(InEdgeIt& i, const Node& p) const { 
-//       i=InEdgeIt(*this, p);
-//       return i;
-//     }
-//     EdgeIt& first(EdgeIt& i) const { 
-//       i=EdgeIt(*this);
-//       return i;
-//     }
-// //     template<typename I> I& first(I& i) const { 
-// //       i=I(*this);
-// //       return i;
-// //     }
-// //     template<typename I, typename P> I& first(I& i, const P& p) const { 
-// //       i=I(*this, p);
-// //       return i;
-// //     }
-    
-// //    template<typename I> I getNext(const I& i) const { 
-// //      return graph->getNext(i); }
-
-//     NodeIt& next(NodeIt& i) const { graph->next(i); return i; }
-//     OutEdgeIt& next(OutEdgeIt& i) const { graph->next(i); return i; }
-//     InEdgeIt& next(InEdgeIt& i) const { graph->next(i); return i; }
-//     EdgeIt& next(EdgeIt& i) const { graph->next(i); return i; }
-// //    template<typename I> I& next(I &i) const { graph->next(i); return i; }    
-//     template< typename It > It first() const { 
-//       It e; this->first(e); return e; }
-
-//     template< typename It > It first(const Node& v) const { 
-//       It e; this->first(e, v); return e; }
-
-//     Node head(const Edge& e) const { return graph->head(e); }
-//     Node tail(const Edge& e) const { return graph->tail(e); }
-
-//     template<typename I> bool valid(const I& i) const { 
-//       return graph->valid(i); }
-  
-//     //template<typename I> void setInvalid(const I &i);
-//     //{ return graph->setInvalid(i); }
-
-//     int nodeNum() const { return graph->nodeNum(); }
-//     int edgeNum() const { return graph->edgeNum(); }
-  
-//     template<typename I> Node aNode(const I& e) const { 
-//       return graph->aNode(e); }
-//     template<typename I> Node bNode(const I& e) const { 
-//       return graph->bNode(e); }
-  
-//     Node addNode() const { return graph->addNode(); }
-//     Edge addEdge(const Node& tail, const Node& head) const { 
-//       return graph->addEdge(tail, head); }
-  
-//     template<typename I> void erase(const I& i) const { graph->erase(i); }
-  
-//     void clear() const { graph->clear(); }
-    
-//     template<typename T> class NodeMap : public Graph::NodeMap<T> { 
-//     public:
-//       NodeMap(const TrivGraphWrapper<Graph>& _G) :  
-// 	Graph::NodeMap<T>(*(_G.graph)) { }
-//       NodeMap(const TrivGraphWrapper<Graph>& _G, T a) : 
-// 	Graph::NodeMap<T>(*(_G.graph), a) { }
-//     };
-
-//     template<typename T> class EdgeMap : public Graph::EdgeMap<T> { 
-//     public:
-//       EdgeMap(const TrivGraphWrapper<Graph>& _G) :  
-// 	Graph::EdgeMap<T>(*(_G.graph)) { }
-//       EdgeMap(const TrivGraphWrapper<Graph>& _G, T a) : 
-// 	Graph::EdgeMap<T>(*(_G.graph), a) { }
-//     };
-
-// //     template<typename Map, typename T> class NodeMapWrapper {
-// //     protected:
-// //       Map* map;
-// //     public:
-// //       NodeMapWrapper(Map& _map) : map(&_map) { }
-// //       void set(Node n, T a) { map->set(n, a); }
-// //       T get(Node n) const { return map->get(n); }
-// //     };
-
-// //     template<typename Map, typename T> class EdgeMapWrapper {
-// //     protected:
-// //       Map* map;
-// //     public:
-// //       EdgeMapWrapper(Map& _map) : map(&_map) { }
-// //       void set(Edge n, T a) { map->set(n, a); }
-// //       T get(Edge n) const { return map->get(n); }
-// //     };
-//   };
-
-
   template<typename Graph>
   class GraphWrapper {
   protected:
@@ -170,77 +20,100 @@
 //     void setGraph(Graph& _graph) { graph=&_graph; }
 //     Graph& getGraph() const { return *graph; }
  
-    typedef typename Graph::Node Node;
-    class NodeIt : public Graph::NodeIt { 
-      typedef typename Graph::NodeIt GraphNodeIt;
+//    typedef typename Graph::Node Node;
+    class Node : public Graph::Node {
+      friend class GraphWrapper<Graph>;
     public:
+      Node() { }
+      Node(const typename Graph::Node& _n) : Graph::Node(_n) { }
+      Node(const Invalid& i) : Graph::Node(i) { }
+    };
+    class NodeIt { 
+      friend class GraphWrapper<Graph>;
+      typename Graph::NodeIt n;
+     public:
       NodeIt() { }
-      NodeIt(const typename Graph::NodeIt& n) : Graph::NodeIt(n) { }
-      NodeIt(const Invalid& i) : Graph::NodeIt(i) { }
-      NodeIt(const GraphWrapper<Graph>& _G) : 
-	Graph::NodeIt(*(_G.graph)) { }
-//      operator Node() const { 
-//	std::cout << "ize" << std::endl; 
-//	return Node(this->GraphNodeIt); 
-//      }
+      NodeIt(const typename Graph::NodeIt& _n) : n(_n) { }
+      NodeIt(const Invalid& i) : n(i) { }
+      NodeIt(const GraphWrapper<Graph>& _G) : n(*(_G.graph)) { }
+      operator Node() const { return Node(typename Graph::Node(n)); }
     };
-    typedef typename Graph::Edge Edge;
-    class OutEdgeIt : public Graph::OutEdgeIt { 
-      typedef typename Graph::OutEdgeIt GraphOutEdgeIt;
+//     class Node : public Graph::Node {
+//     public:
+//       Node() { }
+//       Node(const typename Graph::Node& n) : Graph::Node(n) { }
+//       Node(const Invalid& i) : Graph::Node(i) { }
+//     };
+//     class NodeIt : public Graph::NodeIt { 
+//       typedef typename Graph::NodeIt GraphNodeIt;
+//     public:
+//       NodeIt() { }
+//       NodeIt(const typename Graph::NodeIt& n) : Graph::NodeIt(n) { }
+//       NodeIt(const Invalid& i) : Graph::NodeIt(i) { }
+//       NodeIt(const GraphWrapper<Graph>& _G) : 
+// 	Graph::NodeIt(*(_G.graph)) { }
+//       operator Node() const {
+// 	return Node(typename Graph::Node(
+// 		      static_cast<typename Graph::NodeIt>(*this)
+// 		      ));
+//       }
+//     };
+//    typedef typename Graph::Edge Edge;
+    class Edge : public Graph::Edge {
+      friend class GraphWrapper<Graph>;
+    public:
+      Edge() { }
+      Edge(const typename Graph::Edge& _e) : Graph::Edge(_e) { }
+      Edge(const Invalid& i) : Graph::Edge(i) { }
+    };
+    class OutEdgeIt { 
+      friend class GraphWrapper<Graph>;
+//      typedef typename Graph::OutEdgeIt GraphOutEdgeIt;
+      typename Graph::OutEdgeIt e;
     public:
       OutEdgeIt() { }
-      OutEdgeIt(const typename Graph::OutEdgeIt& e) : Graph::OutEdgeIt(e) { }
-      OutEdgeIt(const Invalid& i) : Graph::OutEdgeIt(i) { }
-      OutEdgeIt(const GraphWrapper<Graph>& _G, const Node& n) : 
-	Graph::OutEdgeIt(*(_G.graph), n) { }
-//      operator Edge() const { 
-//	std::cout << "ize" << std::endl; 
-//	return Edge(this->GraphOutEdgeIt); 
-//      }
+      OutEdgeIt(const typename Graph::OutEdgeIt& _e) : e(_e) { }
+      OutEdgeIt(const Invalid& i) : e(i) { }
+      OutEdgeIt(const GraphWrapper<Graph>& _G, const Node& _n) : 
+	e(*(_G.graph), typename Graph::Node(_n)) { }
+      operator Edge() const { return Edge(typename Graph::Edge(e)); }
     };
-    class InEdgeIt : public Graph::InEdgeIt { 
-      typedef typename Graph::InEdgeIt GraphInEdgeIt;
+    class InEdgeIt { 
+      friend class GraphWrapper<Graph>;
+//      typedef typename Graph::InEdgeIt GraphInEdgeIt;
+      typename Graph::InEdgeIt e;
     public:
       InEdgeIt() { }
-      InEdgeIt(const typename Graph::InEdgeIt& e) : Graph::InEdgeIt(e) { }
-      InEdgeIt(const Invalid& i) : Graph::InEdgeIt(i) { }
-      InEdgeIt(const GraphWrapper<Graph>& _G, const Node& n) : 
-	Graph::InEdgeIt(*(_G.graph), n) { }
-//      operator Edge() const { 
-//	std::cout << "ize" << std::endl; 
-//	return Edge(this->InOutEdgeIt); 
-//      }
+      InEdgeIt(const typename Graph::InEdgeIt& _e) : e(_e) { }
+      InEdgeIt(const Invalid& i) : e(i) { }
+      InEdgeIt(const GraphWrapper<Graph>& _G, const Node& _n) : 
+	e(*(_G.graph), typename Graph::Node(_n)) { }
+      operator Edge() const { return Edge(typename Graph::Edge(e)); }
     };
     //typedef typename Graph::SymEdgeIt SymEdgeIt;
-    class EdgeIt : public Graph::EdgeIt { 
-      typedef typename Graph::EdgeIt GraphEdgeIt;
+    class EdgeIt { 
+      friend class GraphWrapper<Graph>;
+//      typedef typename Graph::EdgeIt GraphEdgeIt;
+      typename Graph::EdgeIt e;
     public:
       EdgeIt() { }
-      EdgeIt(const typename Graph::EdgeIt& e) : Graph::EdgeIt(e) { }
-      EdgeIt(const Invalid& i) : Graph::EdgeIt(i) { }
-      EdgeIt(const GraphWrapper<Graph>& _G) : 
-	Graph::EdgeIt(*(_G.graph)) { }
-//      operator Edge() const { 
-//	std::cout << "ize" << std::endl; 
-//	return Edge(this->GraphEdgeIt); 
-//      }
+      EdgeIt(const typename Graph::EdgeIt& _e) : e(_e) { }
+      EdgeIt(const Invalid& i) : e(i) { }
+      EdgeIt(const GraphWrapper<Graph>& _G) : e(*(_G.graph)) { }
+      operator Edge() const { return Edge(typename Graph::Edge(e)); }
     };
    
     NodeIt& first(NodeIt& i) const { 
-      i=NodeIt(*this);
-      return i;
+      i=NodeIt(*this); return i;
     }
     OutEdgeIt& first(OutEdgeIt& i, const Node& p) const { 
-      i=OutEdgeIt(*this, p);
-      return i;
+      i=OutEdgeIt(*this, p); return i;
     }
     InEdgeIt& first(InEdgeIt& i, const Node& p) const { 
-      i=InEdgeIt(*this, p);
-      return i;
+      i=InEdgeIt(*this, p); return i;
     }
     EdgeIt& first(EdgeIt& i) const { 
-      i=EdgeIt(*this);
-      return i;
+      i=EdgeIt(*this); return i;
     }
 //     template<typename I> I& first(I& i) const {       
 //       i=I(*this);
@@ -254,10 +127,10 @@
 //    template<typename I> I getNext(const I& i) const { 
 //      return gw.getNext(i); }
 
-    NodeIt& next(NodeIt& i) const { graph->next(i); return i; }
-    OutEdgeIt& next(OutEdgeIt& i) const { graph->next(i); return i; }
-    InEdgeIt& next(InEdgeIt& i) const { graph->next(i); return i; }
-    EdgeIt& next(EdgeIt& i) const { graph->next(i); return i; }    
+    NodeIt& next(NodeIt& i) const { graph->next(i.n); return i; }
+    OutEdgeIt& next(OutEdgeIt& i) const { graph->next(i.e); return i; }
+    InEdgeIt& next(InEdgeIt& i) const { graph->next(i.e); return i; }
+    EdgeIt& next(EdgeIt& i) const { graph->next(i.e); return i; }    
 //    template<typename I> I& next(I &i) const { graph->next(i); return i; }    
     template< typename It > It first() const { 
       It e; this->first(e); return e; }
@@ -265,12 +138,18 @@
     template< typename It > It first(const Node& v) const { 
       It e; this->first(e, v); return e; }
 
-    Node head(const Edge& e) const { return graph->head(e); }
-    Node tail(const Edge& e) const { return graph->tail(e); }
+    Node head(const Edge& e) const { 
+      return Node(graph->head(static_cast<typename Graph::Edge>(e))); }
+    Node tail(const Edge& e) const { 
+      return Node(graph->tail(static_cast<typename Graph::Edge>(e))); }
 //    Node tail(const OutEdgeIt& e) const { return graph->tail(Edge(e)); }
 
-    template<typename I> bool valid(const I& i) const { 
-      return graph->valid(i); }
+    bool valid(const Node& n) const { 
+      return graph->valid(static_cast<typename Graph::Node>(n)); }
+    bool valid(const Edge& e) const { 
+      return graph->valid(static_cast<typename Graph::Edge>(e)); }
+//    template<typename I> bool valid(const I& i) const { 
+//      return graph->valid(i); }
   
     //template<typename I> void setInvalid(const I &i);
     //{ return graph->setInvalid(i); }
@@ -278,16 +157,22 @@
     int nodeNum() const { return graph->nodeNum(); }
     int edgeNum() const { return graph->edgeNum(); }
   
-    template<typename I> Node aNode(const I& e) const { 
-      return graph->aNode(e); }
-    template<typename I> Node bNode(const I& e) const { 
-      return graph->bNode(e); }
+    Node aNode(const OutEdgeIt& e) const { return Node(graph->aNode(e.e)); }
+    Node aNode(const InEdgeIt& e) const { return Node(graph->aNode(e.e)); }
+    Node bNode(const OutEdgeIt& e) const { return Node(graph->bNode(e.e)); }
+    Node bNode(const InEdgeIt& e) const { return Node(graph->bNode(e.e)); }
+//     template<typename I> Node aNode(const I& e) const { 
+//       return Node(graph->aNode(e.e)); }
+//     template<typename I> Node bNode(const I& e) const { 
+//       return Node(graph->bNode(e.e)); }
   
-    Node addNode() const { return graph->addNode(); }
+    Node addNode() const { return Node(graph->addNode()); }
     Edge addEdge(const Node& tail, const Node& head) const { 
-      return graph->addEdge(tail, head); }
-  
-    template<typename I> void erase(const I& i) const { graph->erase(i); }
+      return Edge(graph->addEdge(tail, head)); }
+
+    void erase(const Node& i) const { graph->erase(i); }
+    void erase(const Edge& i) const { graph->erase(i); }
+//    template<typename I> void erase(const I& i) const { graph->erase(i); }
   
     void clear() const { graph->clear(); }
     
@@ -297,6 +182,9 @@
 	Graph::NodeMap<T>(*(_G.graph)) { }
       NodeMap(const GraphWrapper<Graph>& _G, T a) : 
 	Graph::NodeMap<T>(*(_G.graph), a) { }
+//       T operator[](const Node& n) const { 
+// 	return Graph::NodeMap<T>::operator[](n); 
+//       }
     };
 
     template<typename T> class EdgeMap : public Graph::EdgeMap<T> { 
@@ -429,80 +317,144 @@
       GraphWrapper<Graph>(_graph), node_filter_map(&_node_filter_map), 
       edge_filter_map(&_edge_filter_map) { }  
 
-
-    typedef typename Graph::Node Node;
-    class NodeIt : public Graph::NodeIt { 
-//      typedef typename Graph::NodeIt GraphNodeIt;
-    public:
+    typedef typename GraphWrapper<Graph>::Node Node;
+    class NodeIt { 
+      friend class GraphWrapper<Graph>;
+      friend class SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>;
+      typename Graph::NodeIt n;
+     public:
       NodeIt() { }
-      NodeIt(const typename Graph::NodeIt& n) : Graph::NodeIt(n) { }
-      NodeIt(const Invalid& i) : Graph::NodeIt(i) { }
+      NodeIt(const typename Graph::NodeIt& _n) : n(_n) { }
+      NodeIt(const Invalid& i) : n(i) { }
       NodeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _G) : 
-	Graph::NodeIt(*(_G.graph)) { 
-	while (_G.graph->valid((*this)/*.GraphNodeIt*/) && 
-	       !(*(_G.node_filter_map))[(*this)/*.GraphNodeIt*/]) 
-	  _G.graph->next((*this)/*.GraphNodeIt*/);
+	n(*(_G.graph)) { 
+	while (_G.graph->valid(n) && !(*(_G.node_filter_map))[n]) 
+	  _G.graph->next(n);
       }
+      operator Node() const { return Node(typename Graph::Node(n)); }
     };
-    typedef typename Graph::Edge Edge;
-    class OutEdgeIt : public Graph::OutEdgeIt { 
+//     class NodeIt : public Graph::NodeIt { 
+// //      typedef typename Graph::NodeIt GraphNodeIt;
+//     public:
+//       NodeIt() { }
+//       NodeIt(const typename Graph::NodeIt& n) : Graph::NodeIt(n) { }
+//       NodeIt(const Invalid& i) : Graph::NodeIt(i) { }
+//       NodeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _G) : 
+// 	Graph::NodeIt(*(_G.graph)) { 
+// 	while (_G.graph->valid((*this)/*.GraphNodeIt*/) && 
+// 	       !(*(_G.node_filter_map))[(*this)/*.GraphNodeIt*/]) 
+// 	  _G.graph->next((*this)/*.GraphNodeIt*/);
+//       }
+//     };
+    typedef typename GraphWrapper<Graph>::Edge Edge;
+    class OutEdgeIt { 
+      friend class GraphWrapper<Graph>;
+      friend class SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>;
 //      typedef typename Graph::OutEdgeIt GraphOutEdgeIt;
+      typename Graph::OutEdgeIt e;
     public:
       OutEdgeIt() { }
-      OutEdgeIt(const typename Graph::OutEdgeIt& e) : Graph::OutEdgeIt(e) { }
-      OutEdgeIt(const Invalid& i) : Graph::OutEdgeIt(i) { }
-      OutEdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& 
-		_G, const Node& n) : 
-	Graph::OutEdgeIt(*(_G.graph), n) { 
-	while (_G.graph->valid((*this)/*.GraphOutEdgeIt*/) && 
-	       !(*(_G.edge_filter_map))[(*this)/*.GraphOutEdgeIt*/]) 
-	  _G.graph->next((*this)/*.GraphOutEdgeIt*/);
+      OutEdgeIt(const typename Graph::OutEdgeIt& _e) : e(_e) { }
+      OutEdgeIt(const Invalid& i) : e(i) { }
+      OutEdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _G, 
+		const Node& _n) : 
+	e(*(_G.graph), typename Graph::Node(_n)) { 
+      	while (_G.graph->valid(e) && !(*(_G.edge_filter_map))[e]) 
+	  _G.graph->next(e);
       }
+      operator Edge() const { return Edge(typename Graph::Edge(e)); }
     };
-    class InEdgeIt : public Graph::InEdgeIt { 
+    class InEdgeIt { 
+      friend class GraphWrapper<Graph>;
+      friend class SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>;
 //      typedef typename Graph::InEdgeIt GraphInEdgeIt;
+      typename Graph::InEdgeIt e;
     public:
       InEdgeIt() { }
-      InEdgeIt(const typename Graph::InEdgeIt& e) : Graph::InEdgeIt(e) { }
-      InEdgeIt(const Invalid& i) : Graph::InEdgeIt(i) { }
+      InEdgeIt(const typename Graph::InEdgeIt& _e) : e(_e) { }
+      InEdgeIt(const Invalid& i) : e(i) { }
       InEdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _G, 
-	       const Node& n) : 
-	Graph::InEdgeIt(*(_G.graph), n) { 
-	while (_G.graph->valid((*this)/*.GraphInEdgeIt*/) && 
-	       !(*(_G.edge_filter_map))[(*this)/*.GraphInEdgeIt*/]) 
-	  _G.graph->next((*this)/*.GraphInEdgeIt*/);
+	       const Node& _n) : 
+	e(*(_G.graph), typename Graph::Node(_n)) { 
+      	while (_G.graph->valid(e) && !(*(_G.edge_filter_map))[e]) 
+	  _G.graph->next(e);
       }
+      operator Edge() const { return Edge(typename Graph::Edge(e)); }
     };
-//     //typedef typename Graph::SymEdgeIt SymEdgeIt;
-    class EdgeIt : public Graph::EdgeIt { 
+    //typedef typename Graph::SymEdgeIt SymEdgeIt;
+    class EdgeIt { 
+      friend class GraphWrapper<Graph>;
+      friend class SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>;
 //      typedef typename Graph::EdgeIt GraphEdgeIt;
+      typename Graph::EdgeIt e;
     public:
       EdgeIt() { }
-      EdgeIt(const typename Graph::EdgeIt& e) : Graph::EdgeIt(e) { }
-      EdgeIt(const Invalid& i) : Graph::EdgeIt(i) { }
+      EdgeIt(const typename Graph::EdgeIt& _e) : e(_e) { }
+      EdgeIt(const Invalid& i) : e(i) { }
       EdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _G) : 
-	Graph::EdgeIt(*(_G.graph)) { 
-	while (_G.graph->valid((*this)/*.GraphEdgeIt*/) && 
-	       !(*(_G.edge_filter_map))[(*this)/*.GraphEdgeIt*/]) 
-	  _G.graph->next((*this)/*.GraphEdgeIt*/);
+	e(*(_G.graph)) { 
+      	while (_G.graph->valid(e) && !(*(_G.edge_filter_map))[e]) 
+	  _G.graph->next(e);
       }
+      operator Edge() const { return Edge(typename Graph::Edge(e)); }
     };
+//       operator Edge() const { return Edge(typename Graph::Edge(e)); }
+//     };
+//     class OutEdgeIt : public Graph::OutEdgeIt { 
+// //      typedef typename Graph::OutEdgeIt GraphOutEdgeIt;
+//     public:
+//       OutEdgeIt() { }
+//       OutEdgeIt(const typename Graph::OutEdgeIt& e) : Graph::OutEdgeIt(e) { }
+//       OutEdgeIt(const Invalid& i) : Graph::OutEdgeIt(i) { }
+//       OutEdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& 
+// 		_G, const Node& n) : 
+// 	Graph::OutEdgeIt(*(_G.graph), n) { 
+// 	while (_G.graph->valid((*this)/*.GraphOutEdgeIt*/) && 
+// 	       !(*(_G.edge_filter_map))[(*this)/*.GraphOutEdgeIt*/]) 
+// 	  _G.graph->next((*this)/*.GraphOutEdgeIt*/);
+//       }
+//     };
+//     class InEdgeIt : public Graph::InEdgeIt { 
+// //      typedef typename Graph::InEdgeIt GraphInEdgeIt;
+//     public:
+//       InEdgeIt() { }
+//       InEdgeIt(const typename Graph::InEdgeIt& e) : Graph::InEdgeIt(e) { }
+//       InEdgeIt(const Invalid& i) : Graph::InEdgeIt(i) { }
+//       InEdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _G, 
+// 	       const Node& n) : 
+// 	Graph::InEdgeIt(*(_G.graph), n) { 
+// 	while (_G.graph->valid((*this)/*.GraphInEdgeIt*/) && 
+// 	       !(*(_G.edge_filter_map))[(*this)/*.GraphInEdgeIt*/]) 
+// 	  _G.graph->next((*this)/*.GraphInEdgeIt*/);
+//       }
+//     };
+// //     //typedef typename Graph::SymEdgeIt SymEdgeIt;
+//     class EdgeIt : public Graph::EdgeIt { 
+// //      typedef typename Graph::EdgeIt GraphEdgeIt;
+//     public:
+//       EdgeIt() { }
+//       EdgeIt(const typename Graph::EdgeIt& e) : Graph::EdgeIt(e) { }
+//       EdgeIt(const Invalid& i) : Graph::EdgeIt(i) { }
+//       EdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _G) : 
+// 	Graph::EdgeIt(*(_G.graph)) { 
+// 	while (_G.graph->valid((*this)/*.GraphEdgeIt*/) && 
+// 	       !(*(_G.edge_filter_map))[(*this)/*.GraphEdgeIt*/]) 
+// 	  _G.graph->next((*this)/*.GraphEdgeIt*/);
+//       }
+//     };
    
-    NodeIt& first(NodeIt& i) const {
-      i=NodeIt(*this);
-      return i;
+
+    NodeIt& first(NodeIt& i) const { 
+      i=NodeIt(*this); return i;
     }
-    OutEdgeIt& first(OutEdgeIt& i, const Node& n) const {
-      i=OutEdgeIt(*this, n);
-      return i;
+    OutEdgeIt& first(OutEdgeIt& i, const Node& p) const { 
+      i=OutEdgeIt(*this, p); return i;
     }
-    InEdgeIt& first(InEdgeIt& i, const Node& n) const {
-      i=InEdgeIt(*this, n);
-      return i;
+    InEdgeIt& first(InEdgeIt& i, const Node& p) const { 
+      i=InEdgeIt(*this, p); return i;
     }
-    EdgeIt& first(EdgeIt& i) const {
-      i=EdgeIt(*this);
-      return i;
+    EdgeIt& first(EdgeIt& i) const { 
+      i=EdgeIt(*this); return i;
     }
     
 //     template<typename I> I& first(I& i) const { 
@@ -519,26 +471,32 @@
 //     }
 
     NodeIt& next(NodeIt& i) const {
-      graph->next(i); 
-      while (graph->valid(i) && !(*node_filter_map)[i]) { graph->next(i); }
+      graph->next(i.n); 
+      while (graph->valid(i) && !(*node_filter_map)[i.n]) { graph->next(i.n); }
       return i;
     }
     OutEdgeIt& next(OutEdgeIt& i) const {
-      graph->next(i); 
-      while (graph->valid(i) && !(*edge_filter_map)[i]) { graph->next(i); }
+      graph->next(i.e); 
+      while (graph->valid(i) && !(*edge_filter_map)[i.e]) { graph->next(i.e); }
       return i;
     }
     InEdgeIt& next(InEdgeIt& i) const {
-      graph->next(i); 
-      while (graph->valid(i) && !(*edge_filter_map)[i]) { graph->next(i); }
+      graph->next(i.e); 
+      while (graph->valid(i) && !(*edge_filter_map)[i.e]) { graph->next(i.e); }
       return i;
     }
     EdgeIt& next(EdgeIt& i) const {
-      graph->next(i); 
-      while (graph->valid(i) && !(*edge_filter_map)[i]) { graph->next(i); }
+      graph->next(i.e); 
+      while (graph->valid(i) && !(*edge_filter_map)[i.e]) { graph->next(i.e); }
       return i;
     }
 
+      
+    Node aNode(const OutEdgeIt& e) const { return Node(graph->aNode(e.e)); }
+    Node aNode(const InEdgeIt& e) const { return Node(graph->aNode(e.e)); }
+    Node bNode(const OutEdgeIt& e) const { return Node(graph->bNode(e.e)); }
+    Node bNode(const InEdgeIt& e) const { return Node(graph->bNode(e.e)); }
+    
     //template<typename I> I getNext(const I& i) const { 
     //  return gw.getNext(i); 
     //}
@@ -556,6 +514,147 @@
       It e; this->first(e, v); return e; }
   };
 
+//   //Subgraph on the same node-set and partial edge-set
+//   template<typename Graph, typename NodeFilterMap, 
+// 	   typename EdgeFilterMap>
+//   class SubGraphWrapper : public GraphWrapper<Graph> {
+//   protected:
+//     NodeFilterMap* node_filter_map;
+//     EdgeFilterMap* edge_filter_map;
+//   public:
+// //     SubGraphWrapper() : GraphWrapper<Graph>(), filter_map(0) { }
+//     SubGraphWrapper(Graph& _graph, NodeFilterMap& _node_filter_map, 
+// 		    EdgeFilterMap& _edge_filter_map) : 
+//       GraphWrapper<Graph>(_graph), node_filter_map(&_node_filter_map), 
+//       edge_filter_map(&_edge_filter_map) { }  
+
+
+//     typedef typename Graph::Node Node;
+//     class NodeIt : public Graph::NodeIt { 
+// //      typedef typename Graph::NodeIt GraphNodeIt;
+//     public:
+//       NodeIt() { }
+//       NodeIt(const typename Graph::NodeIt& n) : Graph::NodeIt(n) { }
+//       NodeIt(const Invalid& i) : Graph::NodeIt(i) { }
+//       NodeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _G) : 
+// 	Graph::NodeIt(*(_G.graph)) { 
+// 	while (_G.graph->valid((*this)/*.GraphNodeIt*/) && 
+// 	       !(*(_G.node_filter_map))[(*this)/*.GraphNodeIt*/]) 
+// 	  _G.graph->next((*this)/*.GraphNodeIt*/);
+//       }
+//     };
+//     typedef typename Graph::Edge Edge;
+//     class OutEdgeIt : public Graph::OutEdgeIt { 
+// //      typedef typename Graph::OutEdgeIt GraphOutEdgeIt;
+//     public:
+//       OutEdgeIt() { }
+//       OutEdgeIt(const typename Graph::OutEdgeIt& e) : Graph::OutEdgeIt(e) { }
+//       OutEdgeIt(const Invalid& i) : Graph::OutEdgeIt(i) { }
+//       OutEdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& 
+// 		_G, const Node& n) : 
+// 	Graph::OutEdgeIt(*(_G.graph), n) { 
+// 	while (_G.graph->valid((*this)/*.GraphOutEdgeIt*/) && 
+// 	       !(*(_G.edge_filter_map))[(*this)/*.GraphOutEdgeIt*/]) 
+// 	  _G.graph->next((*this)/*.GraphOutEdgeIt*/);
+//       }
+//     };
+//     class InEdgeIt : public Graph::InEdgeIt { 
+// //      typedef typename Graph::InEdgeIt GraphInEdgeIt;
+//     public:
+//       InEdgeIt() { }
+//       InEdgeIt(const typename Graph::InEdgeIt& e) : Graph::InEdgeIt(e) { }
+//       InEdgeIt(const Invalid& i) : Graph::InEdgeIt(i) { }
+//       InEdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _G, 
+// 	       const Node& n) : 
+// 	Graph::InEdgeIt(*(_G.graph), n) { 
+// 	while (_G.graph->valid((*this)/*.GraphInEdgeIt*/) && 
+// 	       !(*(_G.edge_filter_map))[(*this)/*.GraphInEdgeIt*/]) 
+// 	  _G.graph->next((*this)/*.GraphInEdgeIt*/);
+//       }
+//     };
+// //     //typedef typename Graph::SymEdgeIt SymEdgeIt;
+//     class EdgeIt : public Graph::EdgeIt { 
+// //      typedef typename Graph::EdgeIt GraphEdgeIt;
+//     public:
+//       EdgeIt() { }
+//       EdgeIt(const typename Graph::EdgeIt& e) : Graph::EdgeIt(e) { }
+//       EdgeIt(const Invalid& i) : Graph::EdgeIt(i) { }
+//       EdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _G) : 
+// 	Graph::EdgeIt(*(_G.graph)) { 
+// 	while (_G.graph->valid((*this)/*.GraphEdgeIt*/) && 
+// 	       !(*(_G.edge_filter_map))[(*this)/*.GraphEdgeIt*/]) 
+// 	  _G.graph->next((*this)/*.GraphEdgeIt*/);
+//       }
+//     };
+   
+//     NodeIt& first(NodeIt& i) const {
+//       i=NodeIt(*this);
+//       return i;
+//     }
+//     OutEdgeIt& first(OutEdgeIt& i, const Node& n) const {
+//       i=OutEdgeIt(*this, n);
+//       return i;
+//     }
+//     InEdgeIt& first(InEdgeIt& i, const Node& n) const {
+//       i=InEdgeIt(*this, n);
+//       return i;
+//     }
+//     EdgeIt& first(EdgeIt& i) const {
+//       i=EdgeIt(*this);
+//       return i;
+//     }
+    
+// //     template<typename I> I& first(I& i) const { 
+// //       graph->first(i); 
+// //       //while (graph->valid(i) && !filter_map->get(i)) { graph->next(i); }
+// //       while (graph->valid(i) && !(*edge_filter_map)[i]) { graph->next(i); }
+// //       return i;
+// //     }
+// //     template<typename I, typename P> I& first(I& i, const P& p) const { 
+// //       graph->first(i, p); 
+// // //      while (graph->valid(i) && !filter_map->get(i)) { graph->next(i); }
+// //       while (graph->valid(i) && !(*edge_filter_map)[i]) { graph->next(i); }
+// //       return i;
+// //     }
+
+//     NodeIt& next(NodeIt& i) const {
+//       graph->next(i); 
+//       while (graph->valid(i) && !(*node_filter_map)[i]) { graph->next(i); }
+//       return i;
+//     }
+//     OutEdgeIt& next(OutEdgeIt& i) const {
+//       graph->next(i); 
+//       while (graph->valid(i) && !(*edge_filter_map)[i]) { graph->next(i); }
+//       return i;
+//     }
+//     InEdgeIt& next(InEdgeIt& i) const {
+//       graph->next(i); 
+//       while (graph->valid(i) && !(*edge_filter_map)[i]) { graph->next(i); }
+//       return i;
+//     }
+//     EdgeIt& next(EdgeIt& i) const {
+//       graph->next(i); 
+//       while (graph->valid(i) && !(*edge_filter_map)[i]) { graph->next(i); }
+//       return i;
+//     }
+
+//     //template<typename I> I getNext(const I& i) const { 
+//     //  return gw.getNext(i); 
+//     //}
+// //     template<typename I> I& next(I &i) const { 
+// //       graph->next(i); 
+// // //      while (graph->valid(i) && !filter_map-get(i)) { graph->next(i); }
+// //       while (graph->valid(i) && !(*edge_filter_map)[i]) { graph->next(i); }
+// //       return i;
+// //     }
+    
+//     template< typename It > It first() const { 
+//       It e; this->first(e); return e; }
+    
+//     template< typename It > It first(const Node& v) const { 
+//       It e; this->first(e, v); return e; }
+//   };
+
 //   template<typename GraphWrapper>
 //   class UndirGraphWrapper {
 //   protected:
@@ -718,109 +817,129 @@
 
   template<typename Graph>
   class UndirGraphWrapper : public GraphWrapper<Graph> {
-  protected:
-    typedef typename Graph::Edge GraphEdge;
-    typedef typename Graph::OutEdgeIt GraphOutEdgeIt;
-    typedef typename Graph::InEdgeIt GraphInEdgeIt;    
+//  protected:
+//    typedef typename Graph::Edge GraphEdge;
+//    typedef typename Graph::OutEdgeIt GraphOutEdgeIt;
+//    typedef typename Graph::InEdgeIt GraphInEdgeIt;    
   public:
     typedef typename GraphWrapper<Graph>::Node Node;
     typedef typename GraphWrapper<Graph>::NodeIt NodeIt;
+    typedef typename GraphWrapper<Graph>::Edge Edge;
+    typedef typename GraphWrapper<Graph>::EdgeIt EdgeIt;
 
 //     UndirGraphWrapper() : GraphWrapper<Graph>() { }
     UndirGraphWrapper(Graph& _graph) : GraphWrapper<Graph>(_graph) { }  
 
-    class Edge {
+    
+//     class Edge {
+//       friend class UndirGraphWrapper<Graph>;
+//     protected:
+//       bool out_or_in; //true iff out
+//       GraphOutEdgeIt out;
+//       GraphInEdgeIt in;
+//     public:
+//       Edge() : out_or_in(), out(), in() { }
+//       Edge(const Invalid& i) : out_or_in(false), out(), in(i) { }
+//       operator GraphEdge() const {
+// 	if (out_or_in) return(out); else return(in);
+//       }
+// //FIXME
+// //2 edges are equal if they "refer" to the same physical edge 
+// //is it good?
+//       friend bool operator==(const Edge& u, const Edge& v) { 
+// 	if (v.out_or_in) 
+// 	  if (u.out_or_in) return (u.out==v.out); else return (u.out==v.in);
+// 	//return (u.out_or_in && u.out==v.out);
+// 	else
+// 	  if (u.out_or_in) return (u.out==v.in); else return (u.in==v.in);
+// 	//return (!u.out_or_in && u.in==v.in);
+//       } 
+//       friend bool operator!=(const Edge& u, const Edge& v) { 
+// 	if (v.out_or_in) 
+// 	  if (u.out_or_in) return (u.out!=v.out); else return (u.out!=v.in);
+// 	//return (!u.out_or_in || u.out!=v.out);
+// 	else
+// 	  if (u.out_or_in) return (u.out!=v.in); else return (u.in!=v.in);
+// 	//return (u.out_or_in || u.in!=v.in);
+//       } 
+//     };
+
+    class OutEdgeIt {
       friend class UndirGraphWrapper<Graph>;
-    protected:
       bool out_or_in; //true iff out
-      GraphOutEdgeIt out;
-      GraphInEdgeIt in;
+      typename Graph::OutEdgeIt out;
+      typename Graph::InEdgeIt in;
     public:
-      Edge() : out_or_in(), out(), in() { }
-      Edge(const Invalid& i) : out_or_in(false), out(), in(i) { }
-      operator GraphEdge() const {
-	if (out_or_in) return(out); else return(in);
-      }
-//FIXME
-//2 edges are equal if they "refer" to the same physical edge 
-//is it good?
-      friend bool operator==(const Edge& u, const Edge& v) { 
-	if (v.out_or_in) 
-	  if (u.out_or_in) return (u.out==v.out); else return (u.out==v.in);
-	//return (u.out_or_in && u.out==v.out);
-	else
-	  if (u.out_or_in) return (u.out==v.in); else return (u.in==v.in);
-	//return (!u.out_or_in && u.in==v.in);
+      OutEdgeIt() { }
+      OutEdgeIt(const Invalid& i) : Edge(i) { }
+      OutEdgeIt(const UndirGraphWrapper<Graph>& _G, const Node& _n) {
+	out_or_in=true; _G.graph->first(out, _n);
+	if (!(_G.graph->valid(out))) { out_or_in=false; _G.graph->first(in, _n);	}
       } 
-      friend bool operator!=(const Edge& u, const Edge& v) { 
-	if (v.out_or_in) 
-	  if (u.out_or_in) return (u.out!=v.out); else return (u.out!=v.in);
-	//return (!u.out_or_in || u.out!=v.out);
-	else
-	  if (u.out_or_in) return (u.out!=v.in); else return (u.in!=v.in);
-	//return (u.out_or_in || u.in!=v.in);
-      } 
-    };
-
-    class OutEdgeIt : public Edge {
-      friend class UndirGraphWrapper<Graph>;
-    public:
-      OutEdgeIt() : Edge() { }
-      OutEdgeIt(const Invalid& i) : Edge(i) { }
-      OutEdgeIt(const UndirGraphWrapper<Graph>& _G, const Node& n) 
-	: Edge() { 
-	out_or_in=true; _G.graph->first(out, n);
-	if (!(_G.graph->valid(out))) { out_or_in=false; _G.graph->first(in, n);	}
+      operator Edge() const { 
+	if (out_or_in) return Edge(out); else return Edge(in); 
       }
     };
+//     class OutEdgeIt : public Edge {
+//       friend class UndirGraphWrapper<Graph>;
+//     public:
+//       OutEdgeIt() : Edge() { }
+//       OutEdgeIt(const Invalid& i) : Edge(i) { }
+//       OutEdgeIt(const UndirGraphWrapper<Graph>& _G, const Node& n) 
+// 	: Edge() { 
+// 	out_or_in=true; _G.graph->first(out, n);
+// 	if (!(_G.graph->valid(out))) { out_or_in=false; _G.graph->first(in, n);	}
+//       }
+//     };
 
+//FIXME InEdgeIt
     typedef OutEdgeIt InEdgeIt; 
 
-    class EdgeIt : public Edge {
-      friend class UndirGraphWrapper<Graph>;
-    protected:
-      NodeIt v;
-    public:
-      EdgeIt() : Edge() { }
-      EdgeIt(const Invalid& i) : Edge(i) { }
-      EdgeIt(const UndirGraphWrapper<Graph>& _G) 
-	: Edge() { 
-	out_or_in=true;
-	//Node v;
-	_G.first(v);
-	if (_G.valid(v)) _G.graph->first(out); else out=INVALID;
-	while (_G.valid(v) && !_G.graph->valid(out)) { 
-	  _G.graph->next(v); 
-	  if (_G.valid(v)) _G.graph->first(out); 
-	}
-      }
-    };
+//     class EdgeIt : public Edge {
+//       friend class UndirGraphWrapper<Graph>;
+//     protected:
+//       NodeIt v;
+//     public:
+//       EdgeIt() : Edge() { }
+//       EdgeIt(const Invalid& i) : Edge(i) { }
+//       EdgeIt(const UndirGraphWrapper<Graph>& _G) 
+// 	: Edge() { 
+// 	out_or_in=true;
+// 	//Node v;
+// 	_G.first(v);
+// 	if (_G.valid(v)) _G.graph->first(out); else out=INVALID;
+// 	while (_G.valid(v) && !_G.graph->valid(out)) { 
+// 	  _G.graph->next(v); 
+// 	  if (_G.valid(v)) _G.graph->first(out); 
+// 	}
+//       }
+//     };
 
-    OutEdgeIt& first(OutEdgeIt& e, const Node& n) const {
-      e.out_or_in=true; graph->first(e.out, n);
-      if (!(graph->valid(e.out))) { e.out_or_in=false; graph->first(e.in, n); }
-      return e;
+    NodeIt& first(NodeIt& i) const { 
+      i=NodeIt(*this); return i;
     }
-
-    EdgeIt& first(EdgeIt& e) const {
-      e.out_or_in=true;
-      //NodeIt v;
-      first(e.v);
-      if (valid(e.v)) graph->first(e.out, e.v); else e.out=INVALID;
-      while (valid(e.v) && !graph->valid(e.out)) { 
-	graph->next(e.v); 
-	if (valid(e.v)) graph->first(e.out, e.v); 
-      }
-      return e;
+    OutEdgeIt& first(OutEdgeIt& i, const Node& p) const { 
+      i=OutEdgeIt(*this, p); return i;
+    }
+//FIXME
+//     InEdgeIt& first(InEdgeIt& i, const Node& p) const { 
+//       i=InEdgeIt(*this, p); return i;
+//     }
+    EdgeIt& first(EdgeIt& i) const { 
+      i=EdgeIt(*this); return i;
     }
 
     template<typename I> I& first(I& i) const { graph->first(i); return i; }
     template<typename I, typename P> I& first(I& i, const P& p) const { 
       graph->first(i, p); return i; }
 
+    NodeIt& next(NodeIt& n) const {
+      GraphWrapper<Graph>::next(n);
+      return n;
+    }
     OutEdgeIt& next(OutEdgeIt& e) const {
       if (e.out_or_in) {
-	Node n=graph->tail(e.out);
+	typename Graph::Node n=graph->tail(e.out);
 	graph->next(e.out);
 	if (!graph->valid(e.out)) { e.out_or_in=false; graph->first(e.in, n); }
       } else {
@@ -828,18 +947,14 @@
       }
       return e;
     }
-
+    //FIXME InEdgeIt
     EdgeIt& next(EdgeIt& e) const {
-      //NodeIt v=tail(e);
-      graph->next(e.out);
-      while (valid(e.v) && !graph->valid(e.out)) { 
-	next(e.v); 
-	if (valid(e.v)) graph->first(e.out, e.v); 
-      }
+      GraphWrapper<Graph>::next(n);
+//      graph->next(e.e);
       return e;
     }
 
-    template<typename I> I& next(I &i) const { graph->next(i); return i; }    
+//    template<typename I> I& next(I &i) const { graph->next(i); return i; }    
 //    template<typename I> I getNext(const I& i) const { return gw.getNext(i); }
 
     template< typename It > It first() const { 
@@ -968,12 +1083,14 @@
 //   };
 
 
+  
+
   template<typename Graph, typename Number, typename FlowMap, typename CapacityMap>
   class ResGraphWrapper : public GraphWrapper<Graph> {
   protected:
-    typedef typename Graph::OutEdgeIt GraphOutEdgeIt;
-    typedef typename Graph::InEdgeIt GraphInEdgeIt;
-    typedef typename Graph::Edge GraphEdge;
+//    typedef typename Graph::OutEdgeIt GraphOutEdgeIt;
+//    typedef typename Graph::InEdgeIt GraphInEdgeIt;
+//    typedef typename Graph::Edge GraphEdge;
     FlowMap* flow;
     const CapacityMap* capacity;
   public:
@@ -989,49 +1106,104 @@
 
     typedef typename GraphWrapper<Graph>::Node Node;
     typedef typename GraphWrapper<Graph>::NodeIt NodeIt;
-    class Edge {
+    class Edge : public Graph::Edge {
       friend class ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>;
     protected:
-      bool out_or_in; //true, iff out
-      GraphOutEdgeIt out;
-      GraphInEdgeIt in;
+      bool forward; //true, iff forward
+//      typename Graph::Edge e;
     public:
-      Edge() : out_or_in(true) { } 
-      Edge(const Invalid& i) : out_or_in(false), out(), in(i) { }
-//       bool valid() const { 
-// 	return out_or_in && out.valid() || in.valid(); }
+      Edge() { }
+      Edge(const typename Graph::Edge& _e, bool _forward) : 
+	Graph::Edge(_e), forward(_forward) { }
+      Edge(const Invalid& i) : Graph::Edge(i), forward(false) { }
+//the unique invalid iterator
       friend bool operator==(const Edge& u, const Edge& v) { 
-	if (v.out_or_in) 
-	  return (u.out_or_in && u.out==v.out);
-	else
-	  return (!u.out_or_in && u.in==v.in);
+	return (v.forward==u.forward && 
+		static_cast<typename Graph::Edge>(u)==
+		static_cast<typename Graph::Edge>(v));
       } 
       friend bool operator!=(const Edge& u, const Edge& v) { 
-	if (v.out_or_in) 
-	  return (!u.out_or_in || u.out!=v.out);
-	else
-	  return (u.out_or_in || u.in!=v.in);
+	return (v.forward!=u.forward || 
+		static_cast<typename Graph::Edge>(u)!=
+		static_cast<typename Graph::Edge>(v));
       } 
-      operator GraphEdge() const {
-	if (out_or_in) return(out); else return(in);
-      }
     };
-    class OutEdgeIt : public Edge {
+//     class Edge {
+//       friend class ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>;
+//     protected:
+//       bool out_or_in; //true, iff out
+//       GraphOutEdgeIt out;
+//       GraphInEdgeIt in;
+//     public:
+//       Edge() : out_or_in(true) { } 
+//       Edge(const Invalid& i) : out_or_in(false), out(), in(i) { }
+// //       bool valid() const { 
+// // 	return out_or_in && out.valid() || in.valid(); }
+//       friend bool operator==(const Edge& u, const Edge& v) { 
+// 	if (v.out_or_in) 
+// 	  return (u.out_or_in && u.out==v.out);
+// 	else
+// 	  return (!u.out_or_in && u.in==v.in);
+//       } 
+//       friend bool operator!=(const Edge& u, const Edge& v) { 
+// 	if (v.out_or_in) 
+// 	  return (!u.out_or_in || u.out!=v.out);
+// 	else
+// 	  return (u.out_or_in || u.in!=v.in);
+//       } 
+//       operator GraphEdge() const {
+// 	if (out_or_in) return(out); else return(in);
+//       }
+//     };
+    class OutEdgeIt {
       friend class ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>;
+    protected:
+      typename Graph::OutEdgeIt out;
+      typename Graph::InEdgeIt in;
+      bool forward;
     public:
       OutEdgeIt() { }
       //FIXME
-      OutEdgeIt(const Edge& e) : Edge(e) { }
-      OutEdgeIt(const Invalid& i) : Edge(i) { }
-      OutEdgeIt(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& resG, Node v) : Edge() { 
+//      OutEdgeIt(const Edge& e) : Edge(e) { }
+      OutEdgeIt(const Invalid& i) : out(i), in(i), forward(false) { }
+//the unique invalid iterator
+      OutEdgeIt(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& resG, Node v) { 
+	forward=true;
 	resG.graph->first(out, v);
-	while( resG.graph->valid(out) && !(resG.resCap(out)>0) ) { resG.graph->next(out); }
+	while( resG.graph->valid(out) && !(resG.resCap(*this)>0) ) { resG.graph->next(out); }
 	if (!resG.graph->valid(out)) {
-	  out_or_in=0;
+	  forward=false;
 	  resG.graph->first(in, v);
-	  while( resG.graph->valid(in) && !(resG.resCap(in)>0) ) { resG.graph->next(in); }
+	  while( resG.graph->valid(in) && !(resG.resCap(*this)>0) ) { resG.graph->next(in); }
 	}
       }
+      operator Edge() const { 
+//	Edge e;
+//	e.forward=this->forward;
+//	if (this->forward) e=out; else e=in;
+//	return e;
+	if (this->forward) 
+	  return Edge(out, this->forward); 
+	else 
+	  return Edge(in, this->forward);
+      }
+    };
+//     class OutEdgeIt : public Edge {
+//       friend class ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>;
+//     public:
+//       OutEdgeIt() { }
+//       //FIXME
+//       OutEdgeIt(const Edge& e) : Edge(e) { }
+//       OutEdgeIt(const Invalid& i) : Edge(i) { }
+//       OutEdgeIt(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& resG, Node v) : Edge() { 
+// 	resG.graph->first(out, v);
+// 	while( resG.graph->valid(out) && !(resG.resCap(out)>0) ) { resG.graph->next(out); }
+// 	if (!resG.graph->valid(out)) {
+// 	  out_or_in=0;
+// 	  resG.graph->first(in, v);
+// 	  while( resG.graph->valid(in) && !(resG.resCap(in)>0) ) { resG.graph->next(in); }
+// 	}
+//       }
 //     public:
 //       OutEdgeIt& operator++() { 
 // 	if (out_or_in) {
@@ -1049,39 +1221,95 @@
 // 	}
 // 	return *this; 
 //       }
-    };
+//    };
 
     //FIXME This is just for having InEdgeIt
 //    class InEdgeIt : public Edge { };
 
-    class EdgeIt : public Edge {
+    class InEdgeIt {
       friend class ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>;
-      NodeIt v; 
+    protected:
+      typename Graph::OutEdgeIt out;
+      typename Graph::InEdgeIt in;
+      bool forward;
+    public:
+      InEdgeIt() { }
+      //FIXME
+//      OutEdgeIt(const Edge& e) : Edge(e) { }
+      InEdgeIt(const Invalid& i) : out(i), in(i), forward(false) { }
+//the unique invalid iterator
+      InEdgeIt(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& resG, Node v) { 
+	forward=true;
+	resG.graph->first(in, v);
+	while( resG.graph->valid(in) && !(resG.resCap(*this)>0) ) { resG.graph->next(in); }
+	if (!resG.graph->valid(in)) {
+	  forward=false;
+	  resG.graph->first(out, v);
+	  while( resG.graph->valid(out) && !(resG.resCap(*this)>0) ) { resG.graph->next(out); }
+	}
+      }
+      operator Edge() const { 
+//	Edge e;
+//	e.forward=this->forward;
+//	if (this->forward) e=out; else e=in;
+//	return e;
+	if (this->forward) 
+	  return Edge(in, this->forward); 
+	else 
+	  return Edge(out, this->forward);
+      }
+    };
+
+    class EdgeIt {
+      friend class ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>;
+    protected:
+      typename Graph::EdgeIt e;
+      bool forward;
     public:
       EdgeIt() { }
-      //EdgeIt(const EdgeIt& e) : Edge(e), v(e.v) { }
-      EdgeIt(const Invalid& i) : Edge(i) { }
-      EdgeIt(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& resG) : Edge() { 
-	resG.graph->first(v);
-	if (resG.graph->valid(v)) resG.graph->first(out, v); else out=INVALID;
-	while (resG.graph->valid(out) && !(resG.resCap(out)>0) ) { resG.graph->next(out); }
-	while (resG.graph->valid(v) && !resG.graph->valid(out)) { 
-	  resG.graph->next(v); 
-	  if (resG.graph->valid(v)) resG.graph->first(out, v); 
-	  while (resG.graph->valid(out) && !(resG.resCap(out)>0) ) { resG.graph->next(out); }
-	}
-	if (!resG.graph->valid(out)) {
-	  out_or_in=0;
-	  resG.graph->first(v);
-	  if (resG.graph->valid(v)) resG.graph->first(in, v); else in=INVALID;
-	  while (resG.graph->valid(in) && !(resG.resCap(in)>0) ) { resG.graph->next(in); }
-	  while (resG.graph->valid(v) && !resG.graph->valid(in)) { 
-	    resG.graph->next(v); 
-	    if (resG.graph->valid(v)) resG.graph->first(in, v); 
-	    while (resG.graph->valid(in) && !(resG.resCap(in)>0) ) { resG.graph->next(in); }
-	  }
+      EdgeIt(const Invalid& i) : e(i), forward(false) { }
+      EdgeIt(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& resG) { 
+	forward=true;
+	resG.graph->first(e);
+	while (resG.graph->valid(e) && !(resG.resCap(*this)>0)) resG.graph->next(e);
+	if (!resG.graph->valid(e)) {
+	  forward=false;
+	  resG.graph->first(e);
+	  while (resG.graph->valid(e) && !(resG.resCap(*this)>0)) resG.graph->next(e);
 	}
       }
+      operator Edge() const { 
+	return Edge(e, this->forward);
+      }
+    };
+//     class EdgeIt : public Edge {
+//       friend class ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>;
+//       NodeIt v; 
+//     public:
+//       EdgeIt() { }
+//       //EdgeIt(const EdgeIt& e) : Edge(e), v(e.v) { }
+//       EdgeIt(const Invalid& i) : Edge(i) { }
+//       EdgeIt(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& resG) : Edge() { 
+// 	resG.graph->first(v);
+// 	if (resG.graph->valid(v)) resG.graph->first(out, v); else out=INVALID;
+// 	while (resG.graph->valid(out) && !(resG.resCap(out)>0) ) { resG.graph->next(out); }
+// 	while (resG.graph->valid(v) && !resG.graph->valid(out)) { 
+// 	  resG.graph->next(v); 
+// 	  if (resG.graph->valid(v)) resG.graph->first(out, v); 
+// 	  while (resG.graph->valid(out) && !(resG.resCap(out)>0) ) { resG.graph->next(out); }
+// 	}
+// 	if (!resG.graph->valid(out)) {
+// 	  out_or_in=0;
+// 	  resG.graph->first(v);
+// 	  if (resG.graph->valid(v)) resG.graph->first(in, v); else in=INVALID;
+// 	  while (resG.graph->valid(in) && !(resG.resCap(in)>0) ) { resG.graph->next(in); }
+// 	  while (resG.graph->valid(v) && !resG.graph->valid(in)) { 
+// 	    resG.graph->next(v); 
+// 	    if (resG.graph->valid(v)) resG.graph->first(in, v); 
+// 	    while (resG.graph->valid(in) && !(resG.resCap(in)>0) ) { resG.graph->next(in); }
+// 	  }
+// 	}
+//       }
 //       EdgeIt& operator++() { 
 // 	if (out_or_in) {
 // 	  ++out;
@@ -1113,78 +1341,102 @@
 // 	}
 // 	return *this;
 //       }
-    };
+//    };
 
     NodeIt& first(NodeIt& i) const { 
-      i=NodeIt(*this); 
-      return i; 
+      i=NodeIt(*this); return i;
     }
     OutEdgeIt& first(OutEdgeIt& i, const Node& p) const { 
-      i=OutEdgeIt(*this, p);
-      return i;
+      i=OutEdgeIt(*this, p); return i;
     }
-    //FIXME Not yet implemented
-    //InEdgeIt& first(InEdgeIt& i, const Node& p) const {
-    //i=InEdgeIt(*this, p);
-    //  return i;
-    //}
-    EdgeIt& first(EdgeIt& e) const { 
-      e=EdgeIt(*this); 
-      return e;
+//    FIXME not tested
+    InEdgeIt& first(InEdgeIt& i, const Node& p) const { 
+      i=InEdgeIt(*this, p); return i;
+    }
+    EdgeIt& first(EdgeIt& i) const { 
+      i=EdgeIt(*this); return i;
     }
    
-    NodeIt& next(NodeIt& n) const { graph->next(n); return n; }
+    NodeIt& next(NodeIt& n) const { GraphWrapper<Graph>::next(n); return n; }
     OutEdgeIt& next(OutEdgeIt& e) const { 
-      if (e.out_or_in) {
+      if (e.forward) {
 	Node v=graph->aNode(e.out);
 	graph->next(e.out);
-	while( graph->valid(e.out) && !(resCap(e.out)>0) ) { graph->next(e.out); }
+	while( graph->valid(e.out) && !(resCap(e)>0) ) { graph->next(e.out); }
 	if (!graph->valid(e.out)) {
-	  e.out_or_in=0;
+	  e.forward=false;
 	  graph->first(e.in, v); 
-	  while( graph->valid(e.in) && !(resCap(e.in)>0) ) { graph->next(e.in); }
+	  while( graph->valid(e.in) && !(resCap(e)>0) ) { graph->next(e.in); }
 	}
       } else {
 	graph->next(e.in);
-	while( graph->valid(e.in) && !(resCap(e.in)>0) ) { graph->next(e.in); } 
+	while( graph->valid(e.in) && !(resCap(e)>0) ) { graph->next(e.in); } 
       }
       return e;
     }
-    //FIXME Not yet implemented
-    //InEdgeIt& next(InEdgeIt& e) const {
-    //  return e;
-    //}
-    EdgeIt& next(EdgeIt& e) const { 
-      if (e.out_or_in) {
+//     FIXME Not tested
+    InEdgeIt& next(InEdgeIt& e) const { 
+      if (e.forward) {
+	Node v=graph->aNode(e.in);
+	graph->next(e.in);
+	while( graph->valid(e.in) && !(resCap(e)>0) ) { graph->next(e.in); }
+	if (!graph->valid(e.in)) {
+	  e.forward=false;
+	  graph->first(e.out, v); 
+	  while( graph->valid(e.out) && !(resCap(e)>0) ) { graph->next(e.out); }
+	}
+      } else {
 	graph->next(e.out);
-	while (graph->valid(e.out) && !(resCap(e.out)>0) ) { graph->next(e.out); }
-	  while (graph->valid(e.v) && !graph->valid(e.out)) { 
-	    graph->next(e.v); 
-	    if (graph->valid(e.v)) graph->first(e.out, e.v); 
-	    while (graph->valid(e.out) && !(resCap(e.out)>0) ) { graph->next(e.out); }
-	  }
-	  if (!graph->valid(e.out)) {
-	    e.out_or_in=0;
-	    graph->first(e.v);
-	    if (graph->valid(e.v)) graph->first(e.in, e.v); else e.in=INVALID;
-	    while (graph->valid(e.in) && !(resCap(e.in)>0) ) { graph->next(e.in); }
-	    while (graph->valid(e.v) && !graph->valid(e.in)) { 
-	      graph->next(e.v); 
-	      if (graph->valid(e.v)) graph->first(e.in, e.v); 
-	      while (graph->valid(e.in) && !(resCap(e.in)>0) ) { graph->next(e.in); }
-	    }  
-	  }
-	} else {
-	  graph->next(e.in);
-	  while (graph->valid(e.in) && !(resCap(e.in)>0) ) { graph->next(e.in); }
-	  while (graph->valid(e.v) && !graph->valid(e.in)) { 
-	    graph->next(e.v); 
-	    if (graph->valid(e.v)) graph->first(e.in, e.v); 
-	    while (graph->valid(e.in) && !(resCap(e.in)>0) ) { graph->next(e.in); }
-	  }
+	while( graph->valid(e.out) && !(resCap(e)>0) ) { graph->next(e.out); } 
+      }
+      return e;
+    }
+    EdgeIt& next(EdgeIt& e) const {
+      if (e.forward) {
+	graph->next(e.e);
+	while( graph->valid(e.e) && !(resCap(e)>0) ) { graph->next(e.e); }
+	if (!graph->valid(e.e)) {
+	  e.forward=false;
+	  graph->first(e.e); 
+	  while( graph->valid(e.e) && !(resCap(e)>0) ) { graph->next(e.e); }
 	}
-	return e;
+      } else {
+	graph->next(e.e);
+	while( graph->valid(e.e) && !(resCap(e)>0) ) { graph->next(e.e); } 
       }
+      return e;
+    }
+//     EdgeIt& next(EdgeIt& e) const { 
+//       if (e.out_or_in) {
+// 	graph->next(e.out);
+// 	while (graph->valid(e.out) && !(resCap(e.out)>0) ) { graph->next(e.out); }
+// 	  while (graph->valid(e.v) && !graph->valid(e.out)) { 
+// 	    graph->next(e.v); 
+// 	    if (graph->valid(e.v)) graph->first(e.out, e.v); 
+// 	    while (graph->valid(e.out) && !(resCap(e.out)>0) ) { graph->next(e.out); }
+// 	  }
+// 	  if (!graph->valid(e.out)) {
+// 	    e.out_or_in=0;
+// 	    graph->first(e.v);
+// 	    if (graph->valid(e.v)) graph->first(e.in, e.v); else e.in=INVALID;
+// 	    while (graph->valid(e.in) && !(resCap(e.in)>0) ) { graph->next(e.in); }
+// 	    while (graph->valid(e.v) && !graph->valid(e.in)) { 
+// 	      graph->next(e.v); 
+// 	      if (graph->valid(e.v)) graph->first(e.in, e.v); 
+// 	      while (graph->valid(e.in) && !(resCap(e.in)>0) ) { graph->next(e.in); }
+// 	    }  
+// 	  }
+// 	} else {
+// 	  graph->next(e.in);
+// 	  while (graph->valid(e.in) && !(resCap(e.in)>0) ) { graph->next(e.in); }
+// 	  while (graph->valid(e.v) && !graph->valid(e.in)) { 
+// 	    graph->next(e.v); 
+// 	    if (graph->valid(e.v)) graph->first(e.in, e.v); 
+// 	    while (graph->valid(e.in) && !(resCap(e.in)>0) ) { graph->next(e.in); }
+// 	  }
+// 	}
+// 	return e;
+//       }
     
 
     template< typename It >
@@ -1202,53 +1454,55 @@
     }
 
     Node tail(Edge e) const { 
-      return ((e.out_or_in) ? graph->aNode(e.out) : graph->aNode(e.in)); }
+      return ((e.forward) ? graph->tail(e) : graph->head(e)); }
     Node head(Edge e) const { 
-      return ((e.out_or_in) ? graph->bNode(e.out) : graph->bNode(e.in)); }
+      return ((e.forward) ? graph->head(e) : graph->tail(e)); }
 
     Node aNode(OutEdgeIt e) const { 
-      return ((e.out_or_in) ? graph->aNode(e.out) : graph->aNode(e.in)); }
+      return ((e.forward) ? graph->aNode(e.out) : graph->aNode(e.in)); }
     Node bNode(OutEdgeIt e) const { 
-      return ((e.out_or_in) ? graph->bNode(e.out) : graph->bNode(e.in)); }
+      return ((e.forward) ? graph->bNode(e.out) : graph->bNode(e.in)); }
 
     int nodeNum() const { return graph->nodeNum(); }
     //FIXME
     //int edgeNum() const { return graph->edgeNum(); }
 
 
-    int id(Node v) const { return graph->id(v); }
+//    int id(Node v) const { return graph->id(v); }
 
-    bool valid(Node n) const { return graph->valid(n); }
+    bool valid(Node n) const { return GraphWrapper<Graph>::valid(n); }
     bool valid(Edge e) const { 
-      return e.out_or_in ? graph->valid(e.out) : graph->valid(e.in); }
+      return graph->valid(e);
+	//return e.forward ? graph->valid(e.out) : graph->valid(e.in); 
+    }
 
     void augment(const Edge& e, Number a) const {
-      if (e.out_or_in)  
+      if (e.forward)  
 // 	flow->set(e.out, flow->get(e.out)+a);
-	flow->set(e.out, (*flow)[e.out]+a);
+	flow->set(e, (*flow)[e]+a);
       else  
 // 	flow->set(e.in, flow->get(e.in)-a);
-	flow->set(e.in, (*flow)[e.in]-a);
+	flow->set(e, (*flow)[e]-a);
     }
 
     Number resCap(const Edge& e) const { 
-      if (e.out_or_in) 
+      if (e.forward) 
 //	return (capacity->get(e.out)-flow->get(e.out)); 
-	return ((*capacity)[e.out]-(*flow)[e.out]); 
+	return ((*capacity)[e]-(*flow)[e]); 
       else 
 //	return (flow->get(e.in)); 
-	return ((*flow)[e.in]); 
+	return ((*flow)[e]); 
     }
 
-    Number resCap(GraphOutEdgeIt out) const { 
-//      return (capacity->get(out)-flow->get(out)); 
-      return ((*capacity)[out]-(*flow)[out]); 
-    }
+//     Number resCap(typename Graph::OutEdgeIt out) const { 
+// //      return (capacity->get(out)-flow->get(out)); 
+//       return ((*capacity)[out]-(*flow)[out]); 
+//     }
     
-    Number resCap(GraphInEdgeIt in) const { 
-//      return (flow->get(in)); 
-      return ((*flow)[in]); 
-    }
+//     Number resCap(typename Graph::InEdgeIt in) const { 
+// //      return (flow->get(in)); 
+//       return ((*flow)[in]); 
+//     }
 
 //     template<typename T> class NodeMap : public Graph::NodeMap<T> { 
 //     public:
@@ -1275,13 +1529,13 @@
       EdgeMap(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& _G) : forward_map(*(_G.graph)), backward_map(*(_G.graph)) { }
       EdgeMap(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& _G, T a) : forward_map(*(_G.graph), a), backward_map(*(_G.graph), a) { }
       void set(Edge e, T a) { 
-	if (e.out_or_in) 
+	if (e.forward) 
 	  forward_map.set(e.out, a); 
 	else 
 	  backward_map.set(e.in, a); 
       }
       T operator[](Edge e) const { 
-	if (e.out_or_in) 
+	if (e.forward) 
 	  return forward_map[e.out]; 
 	else 
 	  return backward_map[e.in]; 
@@ -1295,6 +1549,336 @@
     };
   };
 
+  
+
+//   template<typename Graph, typename Number, typename FlowMap, typename CapacityMap>
+//   class ResGraphWrapper : public GraphWrapper<Graph> {
+//   protected:
+//     typedef typename Graph::OutEdgeIt GraphOutEdgeIt;
+//     typedef typename Graph::InEdgeIt GraphInEdgeIt;
+//     typedef typename Graph::Edge GraphEdge;
+//     FlowMap* flow;
+//     const CapacityMap* capacity;
+//   public:
+
+//     ResGraphWrapper(Graph& _graph, FlowMap& _flow, 
+// 		    const CapacityMap& _capacity) : 
+//       GraphWrapper<Graph>(_graph), flow(&_flow), capacity(&_capacity) { }
+
+//     class Edge; 
+//     class OutEdgeIt; 
+//     friend class Edge; 
+//     friend class OutEdgeIt; 
+
+//     typedef typename GraphWrapper<Graph>::Node Node;
+//     typedef typename GraphWrapper<Graph>::NodeIt NodeIt;
+//     class Edge {
+//       friend class ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>;
+//     protected:
+//       bool out_or_in; //true, iff out
+//       GraphOutEdgeIt out;
+//       GraphInEdgeIt in;
+//     public:
+//       Edge() : out_or_in(true) { } 
+//       Edge(const Invalid& i) : out_or_in(false), out(), in(i) { }
+// //       bool valid() const { 
+// // 	return out_or_in && out.valid() || in.valid(); }
+//       friend bool operator==(const Edge& u, const Edge& v) { 
+// 	if (v.out_or_in) 
+// 	  return (u.out_or_in && u.out==v.out);
+// 	else
+// 	  return (!u.out_or_in && u.in==v.in);
+//       } 
+//       friend bool operator!=(const Edge& u, const Edge& v) { 
+// 	if (v.out_or_in) 
+// 	  return (!u.out_or_in || u.out!=v.out);
+// 	else
+// 	  return (u.out_or_in || u.in!=v.in);
+//       } 
+//       operator GraphEdge() const {
+// 	if (out_or_in) return(out); else return(in);
+//       }
+//     };
+//     class OutEdgeIt : public Edge {
+//       friend class ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>;
+//     public:
+//       OutEdgeIt() { }
+//       //FIXME
+//       OutEdgeIt(const Edge& e) : Edge(e) { }
+//       OutEdgeIt(const Invalid& i) : Edge(i) { }
+//       OutEdgeIt(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& resG, Node v) : Edge() { 
+// 	resG.graph->first(out, v);
+// 	while( resG.graph->valid(out) && !(resG.resCap(out)>0) ) { resG.graph->next(out); }
+// 	if (!resG.graph->valid(out)) {
+// 	  out_or_in=0;
+// 	  resG.graph->first(in, v);
+// 	  while( resG.graph->valid(in) && !(resG.resCap(in)>0) ) { resG.graph->next(in); }
+// 	}
+//       }
+// //     public:
+// //       OutEdgeIt& operator++() { 
+// // 	if (out_or_in) {
+// // 	  Node v=/*resG->*/G->aNode(out);
+// // 	  ++out;
+// // 	  while( out.valid() && !(Edge::resCap()>0) ) { ++out; }
+// // 	  if (!out.valid()) {
+// // 	    out_or_in=0;
+// // 	    G->first(in, v); 
+// // 	    while( in.valid() && !(Edge::resCap()>0) ) { ++in; }
+// // 	  }
+// // 	} else {
+// // 	  ++in;
+// // 	  while( in.valid() && !(Edge::resCap()>0) ) { ++in; } 
+// // 	}
+// // 	return *this; 
+// //       }
+//     };
+
+//     //FIXME This is just for having InEdgeIt
+// //    class InEdgeIt : public Edge { };
+
+//     class EdgeIt : public Edge {
+//       friend class ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>;
+//       NodeIt v; 
+//     public:
+//       EdgeIt() { }
+//       //EdgeIt(const EdgeIt& e) : Edge(e), v(e.v) { }
+//       EdgeIt(const Invalid& i) : Edge(i) { }
+//       EdgeIt(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& resG) : Edge() { 
+// 	resG.graph->first(v);
+// 	if (resG.graph->valid(v)) resG.graph->first(out, v); else out=INVALID;
+// 	while (resG.graph->valid(out) && !(resG.resCap(out)>0) ) { resG.graph->next(out); }
+// 	while (resG.graph->valid(v) && !resG.graph->valid(out)) { 
+// 	  resG.graph->next(v); 
+// 	  if (resG.graph->valid(v)) resG.graph->first(out, v); 
+// 	  while (resG.graph->valid(out) && !(resG.resCap(out)>0) ) { resG.graph->next(out); }
+// 	}
+// 	if (!resG.graph->valid(out)) {
+// 	  out_or_in=0;
+// 	  resG.graph->first(v);
+// 	  if (resG.graph->valid(v)) resG.graph->first(in, v); else in=INVALID;
+// 	  while (resG.graph->valid(in) && !(resG.resCap(in)>0) ) { resG.graph->next(in); }
+// 	  while (resG.graph->valid(v) && !resG.graph->valid(in)) { 
+// 	    resG.graph->next(v); 
+// 	    if (resG.graph->valid(v)) resG.graph->first(in, v); 
+// 	    while (resG.graph->valid(in) && !(resG.resCap(in)>0) ) { resG.graph->next(in); }
+// 	  }
+// 	}
+//       }
+// //       EdgeIt& operator++() { 
+// // 	if (out_or_in) {
+// // 	  ++out;
+// // 	  while (out.valid() && !(Edge::resCap()>0) ) { ++out; }
+// // 	  while (v.valid() && !out.valid()) { 
+// // 	    ++v; 
+// // 	    if (v.valid()) G->first(out, v); 
+// // 	    while (out.valid() && !(Edge::resCap()>0) ) { ++out; }
+// // 	  }
+// // 	  if (!out.valid()) {
+// // 	    out_or_in=0;
+// // 	    G->first(v);
+// // 	    if (v.valid()) G->first(in, v); else in=GraphInEdgeIt();
+// // 	    while (in.valid() && !(Edge::resCap()>0) ) { ++in; }
+// // 	    while (v.valid() && !in.valid()) { 
+// // 	      ++v; 
+// // 	      if (v.valid()) G->first(in, v); 
+// // 	      while (in.valid() && !(Edge::resCap()>0) ) { ++in; }
+// // 	    }  
+// // 	  }
+// // 	} else {
+// // 	  ++in;
+// // 	  while (in.valid() && !(Edge::resCap()>0) ) { ++in; }
+// // 	  while (v.valid() && !in.valid()) { 
+// // 	    ++v; 
+// // 	    if (v.valid()) G->first(in, v); 
+// // 	    while (in.valid() && !(Edge::resCap()>0) ) { ++in; }
+// // 	  }
+// // 	}
+// // 	return *this;
+// //       }
+//     };
+
+//     NodeIt& first(NodeIt& i) const { 
+//       i=NodeIt(*this); 
+//       return i; 
+//     }
+//     OutEdgeIt& first(OutEdgeIt& i, const Node& p) const { 
+//       i=OutEdgeIt(*this, p);
+//       return i;
+//     }
+//     //FIXME Not yet implemented
+//     //InEdgeIt& first(InEdgeIt& i, const Node& p) const {
+//     //i=InEdgeIt(*this, p);
+//     //  return i;
+//     //}
+//     EdgeIt& first(EdgeIt& e) const { 
+//       e=EdgeIt(*this); 
+//       return e;
+//     }
+   
+//     NodeIt& next(NodeIt& n) const { graph->next(n); return n; }
+//     OutEdgeIt& next(OutEdgeIt& e) const { 
+//       if (e.out_or_in) {
+// 	Node v=graph->aNode(e.out);
+// 	graph->next(e.out);
+// 	while( graph->valid(e.out) && !(resCap(e.out)>0) ) { graph->next(e.out); }
+// 	if (!graph->valid(e.out)) {
+// 	  e.out_or_in=0;
+// 	  graph->first(e.in, v); 
+// 	  while( graph->valid(e.in) && !(resCap(e.in)>0) ) { graph->next(e.in); }
+// 	}
+//       } else {
+// 	graph->next(e.in);
+// 	while( graph->valid(e.in) && !(resCap(e.in)>0) ) { graph->next(e.in); } 
+//       }
+//       return e;
+//     }
+//     //FIXME Not yet implemented
+//     //InEdgeIt& next(InEdgeIt& e) const {
+//     //  return e;
+//     //}
+//     EdgeIt& next(EdgeIt& e) const { 
+//       if (e.out_or_in) {
+// 	graph->next(e.out);
+// 	while (graph->valid(e.out) && !(resCap(e.out)>0) ) { graph->next(e.out); }
+// 	  while (graph->valid(e.v) && !graph->valid(e.out)) { 
+// 	    graph->next(e.v); 
+// 	    if (graph->valid(e.v)) graph->first(e.out, e.v); 
+// 	    while (graph->valid(e.out) && !(resCap(e.out)>0) ) { graph->next(e.out); }
+// 	  }
+// 	  if (!graph->valid(e.out)) {
+// 	    e.out_or_in=0;
+// 	    graph->first(e.v);
+// 	    if (graph->valid(e.v)) graph->first(e.in, e.v); else e.in=INVALID;
+// 	    while (graph->valid(e.in) && !(resCap(e.in)>0) ) { graph->next(e.in); }
+// 	    while (graph->valid(e.v) && !graph->valid(e.in)) { 
+// 	      graph->next(e.v); 
+// 	      if (graph->valid(e.v)) graph->first(e.in, e.v); 
+// 	      while (graph->valid(e.in) && !(resCap(e.in)>0) ) { graph->next(e.in); }
+// 	    }  
+// 	  }
+// 	} else {
+// 	  graph->next(e.in);
+// 	  while (graph->valid(e.in) && !(resCap(e.in)>0) ) { graph->next(e.in); }
+// 	  while (graph->valid(e.v) && !graph->valid(e.in)) { 
+// 	    graph->next(e.v); 
+// 	    if (graph->valid(e.v)) graph->first(e.in, e.v); 
+// 	    while (graph->valid(e.in) && !(resCap(e.in)>0) ) { graph->next(e.in); }
+// 	  }
+// 	}
+// 	return e;
+//       }
+    
+
+//     template< typename It >
+//     It first() const { 
+//       It e;
+//       first(e);
+//       return e; 
+//     }
+
+//     template< typename It >
+//     It first(Node v) const { 
+//       It e;
+//       first(e, v);
+//       return e; 
+//     }
+
+//     Node tail(Edge e) const { 
+//       return ((e.out_or_in) ? graph->aNode(e.out) : graph->aNode(e.in)); }
+//     Node head(Edge e) const { 
+//       return ((e.out_or_in) ? graph->bNode(e.out) : graph->bNode(e.in)); }
+
+//     Node aNode(OutEdgeIt e) const { 
+//       return ((e.out_or_in) ? graph->aNode(e.out) : graph->aNode(e.in)); }
+//     Node bNode(OutEdgeIt e) const { 
+//       return ((e.out_or_in) ? graph->bNode(e.out) : graph->bNode(e.in)); }
+
+//     int nodeNum() const { return graph->nodeNum(); }
+//     //FIXME
+//     //int edgeNum() const { return graph->edgeNum(); }
+
+
+//     int id(Node v) const { return graph->id(v); }
+
+//     bool valid(Node n) const { return graph->valid(n); }
+//     bool valid(Edge e) const { 
+//       return e.out_or_in ? graph->valid(e.out) : graph->valid(e.in); }
+
+//     void augment(const Edge& e, Number a) const {
+//       if (e.out_or_in)  
+// // 	flow->set(e.out, flow->get(e.out)+a);
+// 	flow->set(e.out, (*flow)[e.out]+a);
+//       else  
+// // 	flow->set(e.in, flow->get(e.in)-a);
+// 	flow->set(e.in, (*flow)[e.in]-a);
+//     }
+
+//     Number resCap(const Edge& e) const { 
+//       if (e.out_or_in) 
+// //	return (capacity->get(e.out)-flow->get(e.out)); 
+// 	return ((*capacity)[e.out]-(*flow)[e.out]); 
+//       else 
+// //	return (flow->get(e.in)); 
+// 	return ((*flow)[e.in]); 
+//     }
+
+//     Number resCap(GraphOutEdgeIt out) const { 
+// //      return (capacity->get(out)-flow->get(out)); 
+//       return ((*capacity)[out]-(*flow)[out]); 
+//     }
+    
+//     Number resCap(GraphInEdgeIt in) const { 
+// //      return (flow->get(in)); 
+//       return ((*flow)[in]); 
+//     }
+
+// //     template<typename T> class NodeMap : public Graph::NodeMap<T> { 
+// //     public:
+// //       NodeMap(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& _G) 
+// // 	: Graph::NodeMap<T>(_G.gw) { }
+// //       NodeMap(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& _G, 
+// // 	      T a) : Graph::NodeMap<T>(_G.gw, a) { }
+// //     };
+
+// //     template <typename T>
+// //     class NodeMap {
+// //       typename Graph::NodeMap<T> node_map; 
+// //     public:
+// //       NodeMap(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& _G) : node_map(*(_G.graph)) { }
+// //       NodeMap(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& _G, T a) : node_map(*(_G.graph), a) { }
+// //       void set(Node nit, T a) { node_map.set(nit, a); }
+// //       T get(Node nit) const { return node_map.get(nit); }
+// //     };
+
+//     template <typename T>
+//     class EdgeMap {
+//       typename Graph::EdgeMap<T> forward_map, backward_map; 
+//     public:
+//       EdgeMap(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& _G) : forward_map(*(_G.graph)), backward_map(*(_G.graph)) { }
+//       EdgeMap(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& _G, T a) : forward_map(*(_G.graph), a), backward_map(*(_G.graph), a) { }
+//       void set(Edge e, T a) { 
+// 	if (e.out_or_in) 
+// 	  forward_map.set(e.out, a); 
+// 	else 
+// 	  backward_map.set(e.in, a); 
+//       }
+//       T operator[](Edge e) const { 
+// 	if (e.out_or_in) 
+// 	  return forward_map[e.out]; 
+// 	else 
+// 	  return backward_map[e.in]; 
+//       }
+// //       T get(Edge e) const { 
+// // 	if (e.out_or_in) 
+// // 	  return forward_map.get(e.out); 
+// // 	else 
+// // 	  return backward_map.get(e.in); 
+// //       }
+//     };
+//   };
+
+
   //ErasingFirstGraphWrapper for blocking flows
   template<typename Graph, typename FirstOutEdgesMap>
   class ErasingFirstGraphWrapper : public GraphWrapper<Graph> {
@@ -1305,60 +1889,74 @@
 			     FirstOutEdgesMap& _first_out_edges) : 
       GraphWrapper<Graph>(_graph), first_out_edges(&_first_out_edges) { }  
 
-    typedef typename Graph::Node Node;
-    class NodeIt : public Graph::NodeIt { 
-    public:
+    typedef typename GraphWrapper<Graph>::Node Node;
+    class NodeIt { 
+      friend class GraphWrapper<Graph>;
+      friend class ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>;
+      typename Graph::NodeIt n;
+     public:
       NodeIt() { }
-      NodeIt(const typename Graph::NodeIt& n) : Graph::NodeIt(n) { }
-      NodeIt(const Invalid& i) : Graph::NodeIt(i) { }
+      NodeIt(const typename Graph::NodeIt& _n) : n(_n) { }
+      NodeIt(const Invalid& i) : n(i) { }
       NodeIt(const ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>& _G) : 
-	Graph::NodeIt(*(_G.graph)) { }
+	n(*(_G.graph)) { }
+      operator Node() const { return Node(typename Graph::Node(n)); }
     };
-    typedef typename Graph::Edge Edge;
-    class OutEdgeIt : public Graph::OutEdgeIt { 
+    typedef typename GraphWrapper<Graph>::Edge Edge;
+    class OutEdgeIt { 
+      friend class GraphWrapper<Graph>;
+      friend class ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>;
+//      typedef typename Graph::OutEdgeIt GraphOutEdgeIt;
+      typename Graph::OutEdgeIt e;
     public:
       OutEdgeIt() { }
-      OutEdgeIt(const typename Graph::OutEdgeIt& e) : Graph::OutEdgeIt(e) { }
-      OutEdgeIt(const Invalid& i) : Graph::OutEdgeIt(i) { }
+      OutEdgeIt(const typename Graph::OutEdgeIt& _e) : e(_e) { }
+      OutEdgeIt(const Invalid& i) : e(i) { }
       OutEdgeIt(const ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>& _G, 
-		const Node& n) : 
-	Graph::OutEdgeIt((*_G.first_out_edges)[n]) { }
+		const Node& _n) : 
+	e((*_G.first_out_edges)[_n]) { }
+      operator Edge() const { return Edge(typename Graph::Edge(e)); }
     };
-    class InEdgeIt : public Graph::InEdgeIt { 
+    class InEdgeIt { 
+      friend class GraphWrapper<Graph>;
+      friend class ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>;
+//      typedef typename Graph::InEdgeIt GraphInEdgeIt;
+      typename Graph::InEdgeIt e;
     public:
       InEdgeIt() { }
-      InEdgeIt(const typename Graph::InEdgeIt& e) : Graph::InEdgeIt(e) { }
-      InEdgeIt(const Invalid& i) : Graph::InEdgeIt(i) { }
+      InEdgeIt(const typename Graph::InEdgeIt& _e) : e(_e) { }
+      InEdgeIt(const Invalid& i) : e(i) { }
       InEdgeIt(const ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>& _G, 
-	       const Node& n) : 
-	Graph::InEdgeIt(*(_G.graph), n) { }
+	       const Node& _n) : 
+	e(*(_G.graph), typename Graph::Node(_n)) { }
+      operator Edge() const { return Edge(typename Graph::Edge(e)); }
     };
     //typedef typename Graph::SymEdgeIt SymEdgeIt;
-    class EdgeIt : public Graph::EdgeIt { 
+    class EdgeIt { 
+      friend class GraphWrapper<Graph>;
+      friend class ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>;
+//      typedef typename Graph::EdgeIt GraphEdgeIt;
+      typename Graph::EdgeIt e;
     public:
       EdgeIt() { }
-      EdgeIt(const typename Graph::EdgeIt& e) : Graph::EdgeIt(e) { }
-      EdgeIt(const Invalid& i) : Graph::EdgeIt(i) { }
+      EdgeIt(const typename Graph::EdgeIt& _e) : e(_e) { }
+      EdgeIt(const Invalid& i) : e(i) { }
       EdgeIt(const ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>& _G) : 
-	Graph::EdgeIt(*(_G.graph)) { }
+	e(*(_G.graph)) { }
+      operator Edge() const { return Edge(typename Graph::Edge(e)); }
     };
 
-    NodeIt& first(NodeIt& i) const {
-      i=NodeIt(*this);
-      return i;
+    NodeIt& first(NodeIt& i) const { 
+      i=NodeIt(*this); return i;
     }
-    OutEdgeIt& first(OutEdgeIt& i, const Node& n) const {
-      i=OutEdgeIt(*this, n);
-//      i=(*first_out_edges)[n];
-      return i;
+    OutEdgeIt& first(OutEdgeIt& i, const Node& p) const { 
+      i=OutEdgeIt(*this, p); return i;
     }
-    InEdgeIt& first(InEdgeIt& i, const Node& n) const {
-      i=InEdgeIt(*this, n);
-      return i;
+    InEdgeIt& first(InEdgeIt& i, const Node& p) const { 
+      i=InEdgeIt(*this, p); return i;
     }
-    EdgeIt& first(EdgeIt& i) const {
-      i=EdgeIt(*this);
-      return i;
+    EdgeIt& first(EdgeIt& i) const { 
+      i=EdgeIt(*this); return i;
     }
 
 //     template<typename I> I& first(I& i) const { 
@@ -1380,22 +1978,15 @@
     //}
 
 
-    NodeIt& next(NodeIt& i) const {
-      graph->next(i); 
-      return i;
-    }
-    OutEdgeIt& next(OutEdgeIt& i) const {
-      graph->next(i); 
-      return i;
-    }
-    InEdgeIt& next(InEdgeIt& i) const {
-      graph->next(i); 
-      return i;
-    }
-    EdgeIt& next(EdgeIt& i) const {
-      graph->next(i); 
-      return i;
-    }
+    NodeIt& next(NodeIt& i) const { graph->next(i.n); return i; }
+    OutEdgeIt& next(OutEdgeIt& i) const { graph->next(i.e); return i; }
+    InEdgeIt& next(InEdgeIt& i) const { graph->next(i.e); return i; }
+    EdgeIt& next(EdgeIt& i) const { graph->next(i.e); return i; }    
+    
+    Node aNode(const OutEdgeIt& e) const { return Node(graph->aNode(e.e)); }
+    Node aNode(const InEdgeIt& e) const { return Node(graph->aNode(e.e)); }
+    Node bNode(const OutEdgeIt& e) const { return Node(graph->bNode(e.e)); }
+    Node bNode(const InEdgeIt& e) const { return Node(graph->bNode(e.e)); }
 
 //     template<typename I> I& next(I &i) const { 
 //       graph->next(i); 
@@ -1411,10 +2002,131 @@
     void erase(const OutEdgeIt& e) const {
       OutEdgeIt f=e;
       this->next(f);
-      first_out_edges->set(this->tail(e), f);
+      first_out_edges->set(this->tail(e), f.e);
     }
   };
 
+//   //ErasingFirstGraphWrapper for blocking flows
+//   template<typename Graph, typename FirstOutEdgesMap>
+//   class ErasingFirstGraphWrapper : public GraphWrapper<Graph> {
+//   protected:
+//     FirstOutEdgesMap* first_out_edges;
+//   public:
+//     ErasingFirstGraphWrapper(Graph& _graph, 
+// 			     FirstOutEdgesMap& _first_out_edges) : 
+//       GraphWrapper<Graph>(_graph), first_out_edges(&_first_out_edges) { }  
+
+//     typedef typename Graph::Node Node;
+//     class NodeIt : public Graph::NodeIt { 
+//     public:
+//       NodeIt() { }
+//       NodeIt(const typename Graph::NodeIt& n) : Graph::NodeIt(n) { }
+//       NodeIt(const Invalid& i) : Graph::NodeIt(i) { }
+//       NodeIt(const ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>& _G) : 
+// 	Graph::NodeIt(*(_G.graph)) { }
+//     };
+//     typedef typename Graph::Edge Edge;
+//     class OutEdgeIt : public Graph::OutEdgeIt { 
+//     public:
+//       OutEdgeIt() { }
+//       OutEdgeIt(const typename Graph::OutEdgeIt& e) : Graph::OutEdgeIt(e) { }
+//       OutEdgeIt(const Invalid& i) : Graph::OutEdgeIt(i) { }
+//       OutEdgeIt(const ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>& _G, 
+// 		const Node& n) : 
+// 	Graph::OutEdgeIt((*_G.first_out_edges)[n]) { }
+//     };
+//     class InEdgeIt : public Graph::InEdgeIt { 
+//     public:
+//       InEdgeIt() { }
+//       InEdgeIt(const typename Graph::InEdgeIt& e) : Graph::InEdgeIt(e) { }
+//       InEdgeIt(const Invalid& i) : Graph::InEdgeIt(i) { }
+//       InEdgeIt(const ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>& _G, 
+// 	       const Node& n) : 
+// 	Graph::InEdgeIt(*(_G.graph), n) { }
+//     };
+//     //typedef typename Graph::SymEdgeIt SymEdgeIt;
+//     class EdgeIt : public Graph::EdgeIt { 
+//     public:
+//       EdgeIt() { }
+//       EdgeIt(const typename Graph::EdgeIt& e) : Graph::EdgeIt(e) { }
+//       EdgeIt(const Invalid& i) : Graph::EdgeIt(i) { }
+//       EdgeIt(const ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>& _G) : 
+// 	Graph::EdgeIt(*(_G.graph)) { }
+//     };
+
+//     NodeIt& first(NodeIt& i) const {
+//       i=NodeIt(*this);
+//       return i;
+//     }
+//     OutEdgeIt& first(OutEdgeIt& i, const Node& n) const {
+//       i=OutEdgeIt(*this, n);
+// //      i=(*first_out_edges)[n];
+//       return i;
+//     }
+//     InEdgeIt& first(InEdgeIt& i, const Node& n) const {
+//       i=InEdgeIt(*this, n);
+//       return i;
+//     }
+//     EdgeIt& first(EdgeIt& i) const {
+//       i=EdgeIt(*this);
+//       return i;
+//     }
+
+// //     template<typename I> I& first(I& i) const { 
+// //       graph->first(i); 
+// //       return i;
+// //     }
+// //     OutEdgeIt& first(OutEdgeIt& e, const Node& n) const {
+// // //      e=first_out_edges->get(n);
+// //       e=(*first_out_edges)[n];
+// //       return e;
+// //     }
+// //     template<typename I, typename P> I& first(I& i, const P& p) const { 
+// //       graph->first(i, p); 
+// //       return i;
+// //     }
+    
+//     //template<typename I> I getNext(const I& i) const { 
+//     //  return gw.getNext(i); 
+//     //}
+
+
+//     NodeIt& next(NodeIt& i) const {
+//       graph->next(i); 
+//       return i;
+//     }
+//     OutEdgeIt& next(OutEdgeIt& i) const {
+//       graph->next(i); 
+//       return i;
+//     }
+//     InEdgeIt& next(InEdgeIt& i) const {
+//       graph->next(i); 
+//       return i;
+//     }
+//     EdgeIt& next(EdgeIt& i) const {
+//       graph->next(i); 
+//       return i;
+//     }
+
+// //     template<typename I> I& next(I &i) const { 
+// //       graph->next(i); 
+// //       return i;
+// //     }
+    
+//     template< typename It > It first() const { 
+//       It e; this->first(e); return e; }
+    
+//     template< typename It > It first(const Node& v) const { 
+//       It e; this->first(e, v); return e; }
+
+//     void erase(const OutEdgeIt& e) const {
+//       OutEdgeIt f=e;
+//       this->next(f);
+//       first_out_edges->set(this->tail(e), f);
+//     }
+//   };
+
+
 // // FIXME: comparison should be made better!!!
 //   template<typename Graph, typename T, typename LowerMap, typename FlowMap, typename UpperMap>
 //   class ResGraphWrapper