diff -r efbd0ab50a77 -r a7e8ad460d66 lemon/smart_graph.h
--- a/lemon/smart_graph.h	Thu Nov 06 14:40:32 2008 +0000
+++ b/lemon/smart_graph.h	Thu Nov 06 18:35:38 2008 +0100
@@ -480,6 +480,13 @@
     SmartGraphBase()
       : nodes(), arcs() {}
 
+    typedef True NodeNumTag;
+    typedef True EdgeNumTag;
+    typedef True ArcNumTag;
+
+    int nodeNum() const { return nodes.size(); }
+    int edgeNum() const { return arcs.size() / 2; }
+    int arcNum() const { return arcs.size(); }
 
     int maxNodeId() const { return nodes.size()-1; }
     int maxEdgeId() const { return arcs.size() / 2 - 1; }