#include <iostream>

 #include <hugo/list_graph.h>

 #include <hugo/smart_graph.h>

 #include <merge_node_graph_wrapper.h>

 using std::cout;

 using std::endl;

 using namespace hugo;

 int main() {

   SmartGraph g;

   ListGraph h;

   typedef MergeNodeGraphWrapper<SmartGraph, ListGraph> GW;

   GW gw(g, h);

   g.addNode();

   g.addNode();

   g.addNode();

   h.addNode();

   h.addNode();

   //GW::NodeIt n(gw)

   for (GW::NodeIt n(gw); n!=INVALID; ++n) { 

     cout << gw.id(n) << endl;

   }

 }