diff -r a4fc9c5dcee5 -r cc5eb73a3a93 src/work/alpar/emptygraph.h
--- a/src/work/alpar/emptygraph.h	Tue Feb 03 12:41:29 2004 +0000
+++ b/src/work/alpar/emptygraph.h	Tue Feb 03 12:42:54 2004 +0000
@@ -1,6 +1,5 @@
 // -*-mode: c++; -*-
 
-template <class N, class E>
 class Graph
 {
 public:
@@ -54,7 +53,7 @@
     typedef T value_type;
     void set(const NodeIt i, const T &t);
     T get(const NodeIt i) const;
-    T operator[](const NodeIt i);
+    T &operator[](const NodeIt i);
       
     NodeMap(const Graph &G);
   };
@@ -65,7 +64,7 @@
     typedef T value_type;
     void set(const EdgeIt i, const T &t);
     T get(const EdgeIt i) const;
-    T operator[](const EdgeIt i);
+    T &operator[](const EdgeIt i);
       
     EdgeMap(const Graph &G);
   };