// -*- c++ -*-
#ifndef GRAPH_WRAPPER_H
#define GRAPH_WRAPPER_H

#include <invalid.h>

namespace hugo {

  template<typename Graph>
  class TrivGraphWrapper {
  protected:
    Graph* graph;
  
  public:
    typedef Graph BaseGraph;

    typedef typename Graph::Node Node;
    typedef typename Graph::NodeIt NodeIt;

    typedef typename Graph::Edge Edge;
    typedef typename Graph::OutEdgeIt OutEdgeIt;
    typedef typename Graph::InEdgeIt InEdgeIt;
    //typedef typename Graph::SymEdgeIt SymEdgeIt;
    typedef typename Graph::EdgeIt EdgeIt;

    //TrivGraphWrapper() : graph(0) { }
    TrivGraphWrapper(Graph& _graph) : graph(&_graph) { }

    void setGraph(Graph& _graph) { graph = &_graph; }
    Graph& getGraph() const { return (*graph); }
    
    template<typename I> I& first(I& i) const { return graph->first(i); }
    template<typename I, typename P> I& first(I& i, const P& p) const { 
      return graph->first(i, p); }
    
    template<typename I> I getNext(const I& i) const { 
      return graph->getNext(i); }
    template<typename I> I& next(I &i) const { return graph->next(i); }    

    template< typename It > It first() const { 
      It e; first(e); return e; }

    template< typename It > It first(const Node& v) const { 
      It e; 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.getGraph()) { }
      NodeMap(const TrivGraphWrapper<Graph>& _G, T a) : 
	Graph::NodeMap<T>(_G.getGraph(), a) { }
    };

    template<typename T> class EdgeMap : public Graph::EdgeMap<T> { 
    public:
      EdgeMap(const TrivGraphWrapper<Graph>& _G) : 
	Graph::EdgeMap<T>(_G.getGraph()) { }
      EdgeMap(const TrivGraphWrapper<Graph>& _G, T a) : 
	Graph::EdgeMap<T>(_G.getGraph(), a) { }
    };
  };

  template<typename GraphWrapper>
  class GraphWrapperSkeleton {
  protected:
    GraphWrapper gw;
  
  public:
    typedef typename GraphWrapper::BaseGraph BaseGraph;

    typedef typename GraphWrapper::Node Node;
    typedef typename GraphWrapper::NodeIt NodeIt;

    typedef typename GraphWrapper::Edge Edge;
    typedef typename GraphWrapper::OutEdgeIt OutEdgeIt;
    typedef typename GraphWrapper::InEdgeIt InEdgeIt;
    //typedef typename GraphWrapper::SymEdgeIt SymEdgeIt;
    typedef typename GraphWrapper::EdgeIt EdgeIt;

    //GraphWrapperSkeleton() : gw() { }
    GraphWrapperSkeleton(GraphWrapper _gw) : gw(_gw) { }

    void setGraph(BaseGraph& _graph) { gw.setGraph(_graph); }
    BaseGraph& getGraph() const { return gw.getGraph(); }
    
    template<typename I> I& first(I& i) const { return gw.first(i); }
    template<typename I, typename P> I& first(I& i, const P& p) const { 
      return gw.first(i, p); }
    
    template<typename I> I getNext(const I& i) const { return gw.getNext(i); }
    template<typename I> I& next(I &i) const { return gw.next(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 gw.head(e); }
    Node tail(const Edge& e) const { return gw.tail(e); }

    template<typename I> bool valid(const I& i) const { return gw.valid(i); }
  
    //template<typename I> void setInvalid(const I &i);
    //{ return graph->setInvalid(i); }

    int nodeNum() const { return gw.nodeNum(); }
    int edgeNum() const { return gw.edgeNum(); }
  
    template<typename I> Node aNode(const I& e) const { return gw.aNode(e); }
    template<typename I> Node bNode(const I& e) const { return gw.bNode(e); }
  
    Node addNode() const { return gw.addNode(); }
    Edge addEdge(const Node& tail, const Node& head) const { 
      return gw.addEdge(tail, head); }
  
    template<typename I> void erase(const I& i) const { gw.erase(i); }
  
    void clear() const { gw.clear(); }
    
    template<typename T> class NodeMap : public GraphWrapper::NodeMap<T> { 
    public:
      NodeMap(const GraphWrapperSkeleton<GraphWrapper>& _G) : 
	GraphWrapper::NodeMap<T>(_G.gw) { }
      NodeMap(const GraphWrapperSkeleton<GraphWrapper>& _G, T a) : 
	GraphWrapper::NodeMap<T>(_G.gw, a) { }
    };

    template<typename T> class EdgeMap : public GraphWrapper::EdgeMap<T> { 
    public:
      EdgeMap(const GraphWrapperSkeleton<GraphWrapper>& _G) : 
	GraphWrapper::EdgeMap<T>(_G.gw) { }
      EdgeMap(const GraphWrapperSkeleton<GraphWrapper>& _G, T a) : 
	GraphWrapper::EdgeMap<T>(_G.gw, a) { }
    };
  };

//   template<typename Graph>
//   class RevGraphWrapper
//   {
//   protected:
//     Graph* graph;
  
//   public:
//     typedef Graph BaseGraph;

//     typedef typename Graph::Node Node;    
//     typedef typename Graph::NodeIt NodeIt;
  
//     typedef typename Graph::Edge Edge;
//     typedef typename Graph::OutEdgeIt InEdgeIt;
//     typedef typename Graph::InEdgeIt OutEdgeIt;
//     //typedef typename Graph::SymEdgeIt SymEdgeIt;
//     typedef typename Graph::EdgeIt EdgeIt;

//     //RevGraphWrapper() : graph(0) { }
//     RevGraphWrapper(Graph& _graph) : graph(&_graph) { }

//     void setGraph(Graph& _graph) { graph = &_graph; }
//     Graph& getGraph() const { return (*graph); }
    
//     template<typename I> I& first(I& i) const { return graph->first(i); }
//     template<typename I, typename P> I& first(I& i, const P& p) const { 
//       return graph->first(i, p); }

//     template<typename I> I getNext(const I& i) const { 
//       return graph->getNext(i); }
//     template<typename I> I& next(I &i) const { return graph->next(i); }    

//     template< typename It > It first() const { 
//       It e; first(e); return e; }

//     template< typename It > It first(const Node& v) const { 
//       It e; first(e, v); return e; }

//     Node head(const Edge& e) const { return graph->tail(e); }
//     Node tail(const Edge& e) const { return graph->head(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); }
  
//     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); }
  
//     int nodeNum() const { return graph->nodeNum(); }
//     int edgeNum() const { return graph->edgeNum(); }
  
//     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 RevGraphWrapper<Graph>& _G) : 
// 	Graph::NodeMap<T>(_G.getGraph()) { }
//       NodeMap(const RevGraphWrapper<Graph>& _G, T a) : 
// 	Graph::NodeMap<T>(_G.getGraph(), a) { }
//     };

//     template<typename T> class EdgeMap : public Graph::EdgeMap<T> { 
//     public:
//       EdgeMap(const RevGraphWrapper<Graph>& _G) : 
// 	Graph::EdgeMap<T>(_G.getGraph()) { }
//       EdgeMap(const RevGraphWrapper<Graph>& _G, T a) : 
// 	Graph::EdgeMap<T>(_G.getGraph(), a) { }
//     };
//   };

  template<typename /*Graph*/GraphWrapper
  /*=typename GraphWrapperSkeleton< TrivGraphWrapper<Graph>*/ >
  class RevGraphWrapper : 
    public GraphWrapper/*GraphWrapperSkeleton< TrivGraphWrapper<Graph> >*/ {
  protected:
    //Graph* graph;
    
  public:
    //typedef Graph BaseGraph;

    //typedef typename Graph::Node Node;    
    //typedef typename Graph::NodeIt NodeIt;
  
    //typedef typename Graph::Edge Edge;
    typedef typename GraphWrapper/*typename GraphWrapperSkeleton< TrivGraphWrapper<Graph> >*/::OutEdgeIt InEdgeIt;
    typedef typename GraphWrapper/*typename GraphWrapperSkeleton< TrivGraphWrapper<Graph> >*/::InEdgeIt OutEdgeIt;
    //typedef typename Graph::SymEdgeIt SymEdgeIt;
    //typedef typename Graph::EdgeIt EdgeIt;

    //RevGraphWrapper() : graph(0) { }
    RevGraphWrapper(GraphWrapper _gw/*BaseGraph& _graph*/) : GraphWrapper/*GraphWrapperSkeleton< TrivGraphWrapper<Graph> >*/(_gw/*TrivGraphWrapper<Graph>(_graph)*/) { }
    
    //void setGraph(Graph& _graph) { graph = &_graph; }
    //Graph& getGraph() const { return (*graph); }
    
    //template<typename I> I& first(I& i) const { return graph->first(i); }
    //template<typename I, typename P> I& first(I& i, const P& p) const { 
    //  return graph->first(i, p); }

    //template<typename I> I getNext(const I& i) const { 
    //  return graph->getNext(i); }
    //template<typename I> I& next(I &i) const { return graph->next(i); }    

    //template< typename It > It first() const { 
    //  It e; first(e); return e; }

    //template< typename It > It first(const Node& v) const { 
    //  It e; first(e, v); return e; }

    //Node head(const Edge& e) const { return graph->tail(e); }
    //Node tail(const Edge& e) const { return graph->head(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); }
  
    //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); }
  
    //int nodeNum() const { return graph->nodeNum(); }
    //int edgeNum() const { return graph->edgeNum(); }
  
    //template<typename I> void erase(const I& i) const { graph->erase(i); }
  
    //void clear() const { graph->clear(); }

    template<typename T> class NodeMap : 
      public GraphWrapper/*Skeleton< TrivGraphWrapper<Graph> >*/::NodeMap<T> 
    { 
    public:
      NodeMap(const RevGraphWrapper<GraphWrapper>& _gw) : 
	GraphWrapper/*Skeleton< TrivGraphWrapper<Graph> >*/::NodeMap<T>(_gw) { }
      NodeMap(const RevGraphWrapper<GraphWrapper>& _gw, T a) : 
	GraphWrapper/*Skeleton< TrivGraphWrapper<Graph> >*/::NodeMap<T>(_gw, a) { }
    };
    
    template<typename T> class EdgeMap : 
      public GraphWrapper/*Skeleton< TrivGraphWrapper<Graph> >*/::EdgeMap<T> { 
    public:
      EdgeMap(const RevGraphWrapper<GraphWrapper>& _gw) : 
	GraphWrapper/*Skeleton< TrivGraphWrapper<Graph> >*/::EdgeMap<T>(_gw) { }
      EdgeMap(const RevGraphWrapper<GraphWrapper>& _gw, T a) : 
	GraphWrapper/*Skeleton< TrivGraphWrapper<Graph> >*/::EdgeMap<T>(_gw, a) { }
    };
  };


  template<typename Graph>
  class UndirGraphWrapper {
  protected:
    Graph* graph;
  
  public:
    typedef Graph BaseGraph;

    typedef typename Graph::Node Node;
    typedef typename Graph::NodeIt NodeIt;

    //typedef typename Graph::Edge Edge;
    //typedef typename Graph::OutEdgeIt OutEdgeIt;
    //typedef typename Graph::InEdgeIt InEdgeIt;
    //typedef typename Graph::SymEdgeIt SymEdgeIt;
    //typedef typename Graph::EdgeIt EdgeIt;

    //private:
    typedef typename Graph::Edge GraphEdge;
    typedef typename Graph::OutEdgeIt GraphOutEdgeIt;
    typedef typename Graph::InEdgeIt GraphInEdgeIt;
    //public:

    //UndirGraphWrapper() : graph(0) { }
    UndirGraphWrapper(Graph& _graph) : graph(&_graph) { }

    void setGraph(Graph& _graph) { graph = &_graph; }
    Graph& getGraph() const { return (*graph); }
  
    class Edge {
      friend class UndirGraphWrapper<Graph>;
      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);
      }
      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);
      } 
    };

    class OutEdgeIt : public Edge {
      friend class UndirGraphWrapper<Graph>;
    public:
      OutEdgeIt() : Edge() { }
      OutEdgeIt(const Invalid& i) : Edge(i) { }
      OutEdgeIt(const UndirGraphWrapper& _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);
	}
      }
    };

    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;
    }

    OutEdgeIt& next(OutEdgeIt& e) const {
      if (e.out_or_in) {
	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 {
	graph->next(e.in);
      }
      return e;
    }

    Node aNode(const OutEdgeIt& e) const { 
      if (e.out_or_in) return graph->tail(e); else return graph->head(e); }
    Node bNode(const OutEdgeIt& e) const { 
      if (e.out_or_in) return graph->head(e); else return graph->tail(e); }

    typedef OutEdgeIt InEdgeIt; 

    template<typename I> I& first(I& i) const { return graph->first(i); }
//     template<typename I, typename P> I& first(I& i, const P& p) const { 
//       return graph->first(i, p); }
    
    template<typename I> I getNext(const I& i) const { 
      return graph->getNext(i); }
    template<typename I> I& next(I &i) const { return graph->next(i); }    

    template< typename It > It first() const { 
      It e; first(e); return e; }

    template< typename It > It first(const Node& v) const { 
      It e; 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(); }
// FIXME: ez igy nem jo, mert nem
//    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 UndirGraphWrapper<Graph>& _G) : 
	Graph::NodeMap<T>(_G.getGraph()) { }
      NodeMap(const UndirGraphWrapper<Graph>& _G, T a) : 
	Graph::NodeMap<T>(_G.getGraph(), a) { }
    };

    template<typename T> class EdgeMap : public Graph::EdgeMap<T> { 
    public:
      EdgeMap(const UndirGraphWrapper<Graph>& _G) : 
	Graph::EdgeMap<T>(_G.getGraph()) { }
      EdgeMap(const UndirGraphWrapper<Graph>& _G, T a) : 
	Graph::EdgeMap<T>(_G.getGraph(), a) { }
    };
  };



//   template<typename Graph>
//   class SymGraphWrapper
//   {
//     Graph* graph;
  
//   public:
//     typedef Graph BaseGraph;

//     typedef typename Graph::Node Node;
//     typedef typename Graph::Edge Edge;
  
//     typedef typename Graph::NodeIt NodeIt;
    
//     //FIXME tag-ekkel megcsinalni, hogy abbol csinaljon
//     //iranyitatlant, ami van
//     //mert csak 1 dolgot lehet be typedef-elni
//     typedef typename Graph::OutEdgeIt SymEdgeIt;
//     //typedef typename Graph::InEdgeIt SymEdgeIt;
//     //typedef typename Graph::SymEdgeIt SymEdgeIt;
//     typedef typename Graph::EdgeIt EdgeIt;

//     int nodeNum() const { return graph->nodeNum(); }
//     int edgeNum() const { return graph->edgeNum(); }
    
//     template<typename I> I& first(I& i) const { return graph->first(i); }
//     template<typename I, typename P> I& first(I& i, const P& p) const { 
//       return graph->first(i, p); }
//     //template<typename I> I next(const I i); { return graph->goNext(i); }
//     //template<typename I> I &goNext(I &i); { return graph->goNext(i); }

//     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 head(const Edge& e) const { return graph->head(e); }
//     Node tail(const Edge& e) const { return graph->tail(e); }
  
//     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); }
  
//     //template<typename I> bool valid(const I i);
//     //{ return graph->valid(i); }
  
//     //template<typename I> void setInvalid(const I &i);
//     //{ return graph->setInvalid(i); }
  
//     Node addNode() { return graph->addNode(); }
//     Edge addEdge(const Node& tail, const Node& head) { 
//       return graph->addEdge(tail, head); }
  
//     template<typename I> void erase(const I& i) { graph->erase(i); }
  
//     void clear() { graph->clear(); }
  
//     template<typename T> class NodeMap : public Graph::NodeMap<T> { };
//     template<typename T> class EdgeMap : public Graph::EdgeMap<T> { };
  
//     void setGraph(Graph& _graph) { graph = &_graph; }
//     Graph& getGraph() { return (*graph); }

//     //SymGraphWrapper() : graph(0) { }
//     SymGraphWrapper(Graph& _graph) : graph(&_graph) { }
//   };


  template<typename Graph, typename Number, typename FlowMap, typename CapacityMap>
  class ResGraphWrapper {
  public:
    typedef Graph BaseGraph;
    typedef typename Graph::Node Node;
    typedef typename Graph::NodeIt NodeIt;
  private:
    typedef typename Graph::OutEdgeIt OldOutEdgeIt;
    typedef typename Graph::InEdgeIt OldInEdgeIt;
  protected:
    const Graph* graph;
    FlowMap* flow;
    const CapacityMap* capacity;
  public:

    ResGraphWrapper(const Graph& _G, FlowMap& _flow, 
	     const CapacityMap& _capacity) : 
      graph(&_G), flow(&_flow), capacity(&_capacity) { }

    void setGraph(const Graph& _graph) { graph = &_graph; }
    const Graph& getGraph() const { return (*graph); }

    class Edge; 
    class OutEdgeIt; 
    friend class Edge; 
    friend class OutEdgeIt; 

    class Edge {
      friend class ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>;
    protected:
      bool out_or_in; //true, iff out
      OldOutEdgeIt out;
      OldInEdgeIt 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);
      } 
    };


    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) { }
    private:
      OutEdgeIt(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& resG, Node v) : Edge() { 
	resG.graph->first(out, v);
	while( resG.graph->valid(out) && !(resG.free(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.free(in)>0) ) { resG.graph->next(in); }
	}
      }
//     public:
//       OutEdgeIt& operator++() { 
// 	if (out_or_in) {
// 	  Node v=/*resG->*/G->aNode(out);
// 	  ++out;
// 	  while( out.valid() && !(Edge::free()>0) ) { ++out; }
// 	  if (!out.valid()) {
// 	    out_or_in=0;
// 	    G->first(in, v); 
// 	    while( in.valid() && !(Edge::free()>0) ) { ++in; }
// 	  }
// 	} else {
// 	  ++in;
// 	  while( in.valid() && !(Edge::free()>0) ) { ++in; } 
// 	}
// 	return *this; 
//       }
    };

    class EdgeIt : public Edge {
      friend class ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>;
      typename Graph::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=OldOutEdgeIt(INVALID);
	while (resG.graph->valid(out) && !(resG.free(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.free(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=OldInEdgeIt(INVALID);
	  while (resG.graph->valid(in) && !(resG.free(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.free(in)>0) ) { resG.graph->next(in); }
	  }
	}
      }
//       EdgeIt& operator++() { 
// 	if (out_or_in) {
// 	  ++out;
// 	  while (out.valid() && !(Edge::free()>0) ) { ++out; }
// 	  while (v.valid() && !out.valid()) { 
// 	    ++v; 
// 	    if (v.valid()) G->first(out, v); 
// 	    while (out.valid() && !(Edge::free()>0) ) { ++out; }
// 	  }
// 	  if (!out.valid()) {
// 	    out_or_in=0;
// 	    G->first(v);
// 	    if (v.valid()) G->first(in, v); else in=OldInEdgeIt();
// 	    while (in.valid() && !(Edge::free()>0) ) { ++in; }
// 	    while (v.valid() && !in.valid()) { 
// 	      ++v; 
// 	      if (v.valid()) G->first(in, v); 
// 	      while (in.valid() && !(Edge::free()>0) ) { ++in; }
// 	    }  
// 	  }
// 	} else {
// 	  ++in;
// 	  while (in.valid() && !(Edge::free()>0) ) { ++in; }
// 	  while (v.valid() && !in.valid()) { 
// 	    ++v; 
// 	    if (v.valid()) G->first(in, v); 
// 	    while (in.valid() && !(Edge::free()>0) ) { ++in; }
// 	  }
// 	}
// 	return *this;
//       }
    };

    NodeIt& first(NodeIt& v) const { return graph->first(v); }
    OutEdgeIt& first(OutEdgeIt& e, Node v) const { 
      e=OutEdgeIt(*this, v); 
      return e;
    }
    EdgeIt& first(EdgeIt& e) const { 
      e=EdgeIt(*this); 
      return e;
    }
   
    NodeIt& next(NodeIt& n) const { return graph->next(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) && !(free(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) && !(free(e.in)>0) ) { graph->next(e.in); }
	}
      } else {
	graph->next(e.in);
	while( graph->valid(e.in) && !(free(e.in)>0) ) { graph->next(e.in); } 
      }
      return e;
    }

    EdgeIt& next(EdgeIt& e) const { 
      if (e.out_or_in) {
	graph->next(e.out);
	while (graph->valid(e.out) && !(free(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) && !(free(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=OldInEdgeIt(INVALID);
	    while (graph->valid(e.in) && !(free(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) && !(free(e.in)>0) ) { graph->next(e.in); }
	    }  
	  }
	} else {
	  graph->next(e.in);
	  while (graph->valid(e.in) && !(free(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) && !(free(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 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);
      else  
	flow->set(e.in, flow->get(e.in)-a);
    }

    Number free(const Edge& e) const { 
      if (e.out_or_in) 
	return (capacity->get(e.out)-flow->get(e.out)); 
      else 
	return (flow->get(e.in)); 
    }

    Number free(OldOutEdgeIt out) const { 
      return (capacity->get(out)-flow->get(out)); 
    }
    
    Number free(OldInEdgeIt in) const { 
      return (flow->get(in)); 
    }

    template<typename T> class NodeMap : public Graph::NodeMap<T> { 
    public:
      NodeMap(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& _G) 
	: Graph::NodeMap<T>(_G.getGraph()) { }
      NodeMap(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& _G, 
	      T a) : Graph::NodeMap<T>(_G.getGraph(), 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.getGraph()), backward_map(_G.getGraph()) { }
      EdgeMap(const ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& _G, T a) : forward_map(_G.getGraph(), a), backward_map(_G.getGraph(), 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 get(Edge e) { 
	if (e.out_or_in) 
	  return forward_map.get(e.out); 
	else 
	  return backward_map.get(e.in); 
      }
    };
  };

  template<typename Graph, typename Number, typename FlowMap, typename CapacityMap>
  class ErasingResGraphWrapper : public ResGraphWrapper<Graph, Number, FlowMap, CapacityMap> {
  protected:
    ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::NodeMap<typename ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::OutEdgeIt> first_out_edges;
    //ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::NodeMap<int> dist;
  public:
    ErasingResGraphWrapper(const Graph& _G, FlowMap& _flow, 
			   const CapacityMap& _capacity) : 
      ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>(_G, _flow, _capacity), 
      first_out_edges(*this) /*, dist(*this)*/ { 
      for(NodeIt n=this->template first<NodeIt>(); this->valid(n); this->next(n)) {
	OutEdgeIt e;
	ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::first(e, n);
	first_out_edges.set(n, e);
      }
    }

    //void setGraph(Graph& _graph) { graph = &_graph; }
    //Graph& getGraph() const { return (*graph); }
  
    //TrivGraphWrapper() : graph(0) { }
    //ErasingResGraphWrapper(Graph& _graph) : graph(&_graph) { }

    //typedef Graph BaseGraph;

    //typedef typename Graph::Node Node;
    //typedef typename Graph::NodeIt NodeIt;

    //typedef typename Graph::Edge Edge;
    //typedef typename Graph::OutEdgeIt OutEdgeIt;
    //typedef typename Graph::InEdgeIt InEdgeIt;
    //typedef typename Graph::SymEdgeIt SymEdgeIt;
    //typedef typename Graph::EdgeIt EdgeIt;

    typedef typename ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::Node Node;
    typedef typename ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::NodeIt NodeIt;

    typedef typename ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::Edge Edge;
    typedef typename ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::OutEdgeIt OutEdgeIt;
    //typedef typename ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::InEdgeIt InEdgeIt;
    //typedef typename Graph::SymEdgeIt SymEdgeIt;
    //typedef typename ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::EdgeIt EdgeIt;

    NodeIt& first(NodeIt& n) const { 
      return ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::first(n);
    }

    OutEdgeIt& first(OutEdgeIt& e, const Node& n) const { 
      e=first_out_edges.get(n);
      return e;
    }
    
    //ROSSZ template<typename I> I& first(I& i) const { return first(i); }
    //ROSSZ template<typename I, typename P> I& first(I& i, const P& p) const { 
    //  return first(i, p); }
    
    //template<typename I> I getNext(const I& i) const { 
    //  return graph->getNext(i); }
    //template<typename I> I& next(I &i) const { return graph->next(i); }    

    template< typename It > It first() const { 
      It e; first(e); return e; }

    template< typename It > It first(const Node& v) const { 
      It e; 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); }
  
    //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); }
  
    //void erase(const OutEdgeIt& e) {
    //  first_out_edge(this->tail(e))=e;
    //}
    void erase(const Edge& e) {
      OutEdgeIt f(e);
      next(f);
      first_out_edges.set(this->tail(e), f);
    }
    //template<typename I> void erase(const I& i) const { graph->erase(i); }
  
    //void clear() const { graph->clear(); }
    
    template<typename T> class NodeMap : public ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::NodeMap<T> { 
    public:
      NodeMap(const ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& _G) : 
	ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::NodeMap<T>(_G /*_G.getGraph()*/) { }
      NodeMap(const ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& _G, T a) : 
	ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::NodeMap<T>(_G /*_G.getGraph()*/, a) { }
    };

    template<typename T> class EdgeMap : public ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::EdgeMap<T> { 
    public:
      EdgeMap(const ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& _G) : 
	ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::EdgeMap<T>(_G /*_G.getGraph()*/) { }
      EdgeMap(const ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>& _G, T a) : 
	ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::EdgeMap<T>(_G /*_G.getGraph()*/, a) { }
    };
  };

  template<typename GraphWrapper> 
  class FilterGraphWrapper {
  };

  template<typename Graph, typename Number, typename FlowMap, typename CapacityMap>
  class FilterGraphWrapper<ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap> > : public ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap> {

    //Graph* graph;
  
  public:
    //typedef Graph BaseGraph;

    typedef typename ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::Node Node;
    typedef typename ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::NodeIt NodeIt;

    typedef typename ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::Edge Edge;
    typedef typename ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::OutEdgeIt OutEdgeIt;
    //typedef typename ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::InEdgeIt InEdgeIt;
    //typedef typename Graph::SymEdgeIt SymEdgeIt;
    typedef typename ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::EdgeIt EdgeIt;

    //FilterGraphWrapper<Graph, Number, FlowMap, CapacityMap>::NodeMap<typename ResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::OutEdgeIt> first_out_edges;
    
  public:
    FilterGraphWrapper(const Graph& _G, FlowMap& _flow, 
			   const CapacityMap& _capacity) : 
      ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>(_G, _flow, _capacity), dist(*this, graph->nodeNum()) { 
    }

    OutEdgeIt& first(OutEdgeIt& e, const Node& n) const {
      ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::first(e, n);
      while (valid(e) && (dist.get(tail(e))/*+1!=*/>=dist.get(head(e)))) 
	ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::next(e);
      return e;
    }

    NodeIt& next(NodeIt& e) const {
      return ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::next(e);
    }

    OutEdgeIt& next(OutEdgeIt& e) const {
      ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::next(e);
      while (valid(e) && (dist.get(tail(e))/*+1!*/>=dist.get(head(e)))) 
	ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::next(e);
      return e;
    }

    NodeIt& first(NodeIt& n) const {
      return ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::first(n);
    }

    void erase(const Edge& e) {
      OutEdgeIt f(e);
      ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::next(f);
      while (valid(f) && (dist.get(tail(f))/*+1!=*/>=dist.get(head(f)))) 
	ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::next(f);
      first_out_edges.set(this->tail(e), f);
    }

    //TrivGraphWrapper() : graph(0) { }
    //TrivGraphWrapper(Graph& _graph) : graph(&_graph) { }

    //void setGraph(Graph& _graph) { graph = &_graph; }
    //Graph& getGraph() const { return (*graph); }
    
    //template<typename I> I& first(I& i) const { return graph->first(i); }
    //template<typename I, typename P> I& first(I& i, const P& p) const { 
    //  return graph->first(i, p); }
    
    //template<typename I> I getNext(const I& i) const { 
    //  return graph->getNext(i); }
    //template<typename I> I& next(I &i) const { return graph->next(i); }    

    template< typename It > It first() const { 
      It e; first(e); return e; }

    template< typename It > It first(const Node& v) const { 
      It e; 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 ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::NodeMap<T> { 
    public:
      NodeMap(const FilterGraphWrapper<ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap> >& _G) : 
	ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::NodeMap<T>(_G /*_G.getGraph()*/) { }
      NodeMap(const FilterGraphWrapper<ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap> >& _G, T a) : 
	ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::NodeMap<T>(_G /*_G.getGraph()*/, a) { }
    };

    template<typename T> class EdgeMap : public ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::EdgeMap<T> { 
    public:
      EdgeMap(const FilterGraphWrapper<ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap> >& _G) : 
	ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::EdgeMap<T>(_G /*_G.getGraph()*/) { }
      EdgeMap(const FilterGraphWrapper<ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap> >& _G, T a) : 
	ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::EdgeMap<T>(_G /*_G.getGraph()*/, a) { }
    };

  public:
    ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::NodeMap<int> dist;

  };



// // FIXME: comparison should be made better!!!
//   template<typename Graph, typename T, typename LowerMap, typename FlowMap, typename UpperMap>
//   class ResGraphWrapper
//   {
//     Graph* graph;
  
//   public:
//     typedef Graph BaseGraph;

//     typedef typename Graph::Node Node;
//     typedef typename Graph::Edge Edge;
  
//     typedef typename Graph::NodeIt NodeIt;
   
//     class OutEdgeIt {
//     public:
//       //Graph::Node n;
//       bool out_or_in;
//       typename Graph::OutEdgeIt o;
//       typename Graph::InEdgeIt i;   
//     };
//     class InEdgeIt {
//     public:
//       //Graph::Node n;
//       bool out_or_in;
//       typename Graph::OutEdgeIt o;
//       typename Graph::InEdgeIt i;   
//     };
//     typedef typename Graph::SymEdgeIt SymEdgeIt;
//     typedef typename Graph::EdgeIt EdgeIt;

//     int nodeNum() const { return graph->nodeNum(); }
//     int edgeNum() const { return graph->edgeNum(); }

//     Node& first(Node& n) const { return graph->first(n); }

//     // Edge and SymEdge  is missing!!!!
//     // Edge <-> In/OutEdgeIt conversion is missing!!!!

//     //FIXME
//     OutEdgeIt& first(OutEdgeIt& e, const Node& n) const 
//       {
// 	e.n=n;
// 	graph->first(e.o,n);
// 	while(graph->valid(e.o) && fmap.get(e.o)>=himap.get(e.o))
// 	  graph->goNext(e.o);
// 	if(!graph->valid(e.o)) {
// 	  graph->first(e.i,n);
// 	  while(graph->valid(e.i) && fmap.get(e.i)<=lomap.get(e.i))
// 	    graph->goNext(e.i);
// 	}
// 	return e;
//       }
// /*
//   OutEdgeIt &goNext(OutEdgeIt &e)
//   {
//   if(graph->valid(e.o)) {
//   while(graph->valid(e.o) && fmap.get(e.o)>=himap.get(e.o))
//   graph->goNext(e.o);
//   if(graph->valid(e.o)) return e;
//   else graph->first(e.i,e.n);
//   }
//   else {
//   while(graph->valid(e.i) && fmap.get(e.i)<=lomap.get(e.i))
//   graph->goNext(e.i);
//   return e;
//   }
//   }
//   OutEdgeIt Next(const OutEdgeIt &e) {OutEdgeIt t(e); return goNext(t);}
// */
//     //bool valid(const OutEdgeIt e) { return graph->valid(e.o)||graph->valid(e.i);}

//     //FIXME
//     InEdgeIt& first(InEdgeIt& e, const Node& n) const 
//       {
// 	e.n=n;
// 	graph->first(e.i,n);
// 	while(graph->valid(e.i) && fmap.get(e.i)>=himap.get(e.i))
// 	  graph->goNext(e.i);
// 	if(!graph->valid(e.i)) {
// 	  graph->first(e.o,n);
// 	  while(graph->valid(e.o) && fmap.get(e.o)<=lomap.get(e.o))
// 	    graph->goNext(e.o);
// 	}
// 	return e;
//       }
// /*
//   InEdgeIt &goNext(InEdgeIt &e)
//   {
//   if(graph->valid(e.i)) {
//   while(graph->valid(e.i) && fmap.get(e.i)>=himap.get(e.i))
//   graph->goNext(e.i);
//   if(graph->valid(e.i)) return e;
//   else graph->first(e.o,e.n);
//   }
//   else {
//   while(graph->valid(e.o) && fmap.get(e.o)<=lomap.get(e.o))
//   graph->goNext(e.o);
//   return e;
//   }
//   }
//   InEdgeIt Next(const InEdgeIt &e) {InEdgeIt t(e); return goNext(t);}
// */
//     //bool valid(const InEdgeIt e) { return graph->valid(e.i)||graph->valid(e.o);}

//     //template<typename I> I &goNext(I &i); { return graph->goNext(i); }
//     //template<typename I> I next(const I i); { return graph->goNext(i); }

//     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 head(const Edge& e) const { return graph->head(e); }
//     Node tail(const Edge& e) const { return graph->tail(e); }
  
//     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); }
  
//     //template<typename I> bool valid(const I i);
//     //{ return graph->valid(i); }
  
//     //template<typename I> void setInvalid(const I &i);
//     //{ return graph->setInvalid(i); }
  
//     Node addNode() { return graph->addNode(); }
//     Edge addEdge(const Node& tail, const Node& head) { 
//       return graph->addEdge(tail, head); }
  
//     template<typename I> void erase(const I& i) { graph->erase(i); }
  
//     void clear() { graph->clear(); }
  
//     template<typename S> class NodeMap : public Graph::NodeMap<S> { };
//     template<typename S> class EdgeMap : public Graph::EdgeMap<S> { };
  
//     void setGraph(Graph& _graph) { graph = &_graph; }
//     Graph& getGraph() { return (*graph); }

//     //ResGraphWrapper() : graph(0) { }
//     ResGraphWrapper(Graph& _graph) : graph(&_graph) { }
//   };

} //namespace hugo

#endif //GRAPH_WRAPPER_H