//typedef SmartGraph Graph;

 typedef SmartGraph Graph;

 typedef EmptyGraph Graph;

 //typedef GraphSkeleton Graph;

   NodeIt n;

   {

     NodeIt n;

   for(G.first(n);G.valid(n);G.next(n)) 

   for(NodeIt i(G);G.valid(i);G.next(i)) 

     for(NodeIt m(G);m!=INVALID;G.next(m)) 

     for(NodeIt j(G);G.valid(j);G.next(j)) 

       if(n!=m) G.addEdge(n,m);

       if(i<j) G.addEdge(i,j);           //The iterators are comparable

   Graph::NodeMap<int> n(G);

   int count=0;

   for(NodeIt i(G);G.valid(i);G.next(i)) n[i]=count++;

   Graph::NodeMap<int> nn=n;

   Graph::NodeMap<double> dd=n;

   OutEdgeIt e = safeFirstOut(G,n);

   n = nn;

   OutEdgeIt f = safeFirstOut(G,NodeIt(G));

   InEdgeIt i(INVALID), j;

   // Test of SymSmartGraph

   InEdgeIt ii(i);

   ii=G.first(i,n);

   ii=G.next(i);

   OutEdgeIt o(INVALID), oo;

   {

   OutEdgeIt ooo(oo);

     typedef SymSmartGraph Graph;

   oo=G.first(o,n);

     typedef Graph::Edge Edge;

   oo=G.next(o);

     typedef Graph::InEdgeIt InEdgeIt;

     typedef Graph::OutEdgeIt OutEdgeIt;

     typedef Graph::EdgeIt EdgeIt;

     typedef Graph::Node Node;

     typedef Graph::NodeIt NodeIt;

     Graph G;

     for(int i=0;i<10;i++) G.addNode();

     for(NodeIt i(G);G.valid(i);G.next(i)) 

       for(NodeIt j(G);G.valid(j);G.next(j)) 

 	if(i<j) G.addEdge(i,j);           //The iterators are comparable

   EdgeIt ei(INVALID), eie;

     Graph::EdgeMap<int> em(G);

   EdgeIt eiee(ei);

     Graph::SymEdgeMap<int> sm(G);

   eie=G.first(ei);

     for(EdgeIt e(G);G.valid(e);G.next(e)) em[e]=G.id(e);

   eie=G.next(ei);

     for(EdgeIt e(G);G.valid(e);G.next(e))

       if(G.tail(e)<G.head(e)) sm[e]=G.id(e);

   Edge eee(i);

   eee=o;

     for(EdgeIt e(G);G.valid(e);G.next(e))

   eee=eie;

       std::cout << G.id(G.tail(e)) << "->" << G.id(G.head(e))

 		<< ": id=" << G.id(e) << " oppid=" << G.id(G.opposite(e))

 		<< " em=" << em[e]

   bool tm;

 		<< " sm=" << sm[e] << "\n";

   tm = G.valid(n) && G.valid(i) && G.valid(o) && G.valid(ei);

   }

   std::vector<InEdgeIt> v(10);

   std::vector<InEdgeIt> w(10,INVALID);