1.1 --- a/src/work/alpar/emptygraph.h	Fri Mar 12 16:13:44 2004 +0000
     1.2 +++ b/src/work/alpar/emptygraph.h	Fri Mar 12 16:37:08 2004 +0000
     1.3 @@ -171,8 +171,8 @@
     1.4  
     1.5      void clear() {}
     1.6  
     1.7 -    int nodeNum() { return 0;}
     1.8 -    int edgeNum() { return 0;}
     1.9 +    int nodeNum() const { return 0;}
    1.10 +    int edgeNum() const { return 0;}
    1.11  
    1.12      EmptyGraph() {}
    1.13      EmptyGraph(const EmptyGraph &G) {}