#ifndef XYMAP_H

 #define XYMAP_H

 #include <lemon/list_graph.h>

 #include <lemon/xy.h>

 template<class M>

 class XYMap

 {

   private:

     M *xmap, *ymap;

   public:

     typedef typename M::Key Key;

     typedef lemon::xy<typename M::Value> Value;

     XYMap() {}

     XYMap(M &_xmap, M &_ymap) : xmap(&_xmap), ymap(&_ymap) {}

     void setXMap(M &_xmap) { xmap = &_xmap; }

     void setYMap(M &_ymap) { ymap = &_ymap; }

     Value operator[](Key k) const

     {

       Value v(xmap->operator[](k), ymap->operator[](k));

       return v;

     }

     void set(Key k, Value v)

     {

       xmap->set(k, v.x);

       ymap->set(k, v.y);

     }

 };

 #endif