diff -r b7b7125a5fe8 -r e825655c24a4 lemon/graph_utils.h
--- a/lemon/graph_utils.h	Mon Sep 12 05:35:36 2005 +0000
+++ b/lemon/graph_utils.h	Mon Sep 12 09:15:59 2005 +0000
@@ -159,6 +159,15 @@
     return countNodeDegree<Graph, typename Graph::InEdgeIt>(_g, _n);
   }
 
+  /// \brief Function to count the number of the in-edges to node \c n.
+  ///
+  /// This function counts the number of the in-edges to node \c n
+  /// in the graph.  
+  template <typename Graph>
+  inline int countIncEdges(const Graph& _g,  const typename Graph::Node& _n) {
+    return countNodeDegree<Graph, typename Graph::IncEdgeIt>(_g, _n);
+  }
+
 
   template <typename Graph>
   inline
@@ -912,7 +921,7 @@
     /// The subscript operator.
     /// \param edge The edge 
     /// \return The source of the edge 
-    Value operator[](const Key& edge) {
+    Value operator[](const Key& edge) const {
       return graph.source(edge);
     }
 
@@ -953,7 +962,7 @@
     /// The subscript operator.
     /// \param e The edge 
     /// \return The target of the edge 
-    Value operator[](const Key& e) {
+    Value operator[](const Key& e) const {
       return graph.target(e);
     }