To be on the safe side...
     1 #include<smart_graph.h>
 
     9 typedef SmartGraph Graph;
 
    10 //typedef GraphSkeleton Graph;
 
    13 Graph::OutEdgeIt safeFirstOut(const Graph &G, Graph::Node n)
 
    15   return G.valid(n) ? Graph::OutEdgeIt(G,n):INVALID;
 
    21   typedef Graph::Edge Edge;
 
    22   typedef Graph::InEdgeIt InEdgeIt;
 
    23   typedef Graph::OutEdgeIt OutEdgeIt;
 
    24   typedef Graph::EdgeIt EdgeIt;
 
    25   typedef Graph::Node Node;
 
    26   typedef Graph::NodeIt NodeIt;
 
    33     for(int i=0;i<10;i++) G.addNode();
 
    34     for(G.first(n);G.valid(n);G.next(n)) 
 
    35       for(NodeIt m(G);m!=INVALID;G.next(m)) 
 
    36 	if(n!=m) G.addEdge(n,m);
 
    38     OutEdgeIt e = safeFirstOut(G,n);
 
    39     OutEdgeIt f = safeFirstOut(G,NodeIt(G));
 
    42     InEdgeIt i(INVALID), j;
 
    47     OutEdgeIt o(INVALID), oo;
 
    52     EdgeIt ei(INVALID), eie;
 
    63     tm = G.valid(n) && G.valid(i) && G.valid(o) && G.valid(ei);
 
    65     std::vector<InEdgeIt> v(10);
 
    66     std::vector<InEdgeIt> w(10,INVALID);
 
    74   for(int i=0;i<10;i++) G.addNode();
 
    75   for(NodeIt i(G);G.valid(i);G.next(i)) 
 
    76     for(NodeIt j(G);G.valid(j);G.next(j)) 
 
    77       if(i<j) G.addEdge(i,j);           //The iterators are comparable
 
    79   Graph::NodeMap<int> n(G);
 
    81   for(NodeIt i(G);G.valid(i);G.next(i)) n[i]=count++;
 
    83   Graph::NodeMap<int> nn=n;
 
    84   Graph::NodeMap<double> dd=n;
 
    90   Graph::EdgeMap<int> emap(G);
 
    92   // Test of SymSmartGraph
 
    95     typedef SymSmartGraph Graph;
 
    96     typedef Graph::Edge Edge;
 
    97     typedef Graph::InEdgeIt InEdgeIt;
 
    98     typedef Graph::OutEdgeIt OutEdgeIt;
 
    99     typedef Graph::EdgeIt EdgeIt;
 
   100     typedef Graph::Node Node;
 
   101     typedef Graph::NodeIt NodeIt;
 
   105     for(int i=0;i<10;i++) G.addNode();
 
   106     for(NodeIt i(G);G.valid(i);G.next(i)) 
 
   107       for(NodeIt j(G);G.valid(j);G.next(j)) 
 
   108 	if(i<j) G.addEdge(i,j);           //The iterators are comparable
 
   110     Graph::EdgeMap<int> em(G);
 
   111     Graph::SymEdgeMap<int> sm(G);
 
   112     for(EdgeIt e(G);G.valid(e);G.next(e)) em[e]=G.id(e);
 
   113     for(EdgeIt e(G);G.valid(e);G.next(e))
 
   114       if(G.tail(e)<G.head(e)) sm[e]=G.id(e);
 
   116     for(EdgeIt e(G);G.valid(e);G.next(e))
 
   117       std::cout << G.id(G.tail(e)) << "->" << G.id(G.head(e))
 
   118 		<< ": id=" << G.id(e) << " oppid=" << G.id(G.opposite(e))
 
   120 		<< " sm=" << sm[e] << "\n";