diff -r 289d80c33f04 -r 1a770e9f80b2 src/lemon/concept/graph_component.h
--- a/src/lemon/concept/graph_component.h	Thu Nov 04 22:04:51 2004 +0000
+++ b/src/lemon/concept/graph_component.h	Fri Nov 05 00:31:49 2004 +0000
@@ -263,15 +263,14 @@
 	function_requires< GraphItemConcept<Node> >();
 	function_requires< GraphItemConcept<Edge> >();
 	{
-	  const Graph& const_graph = graph;
 	  Node n;
 	  Edge e;
-	  n = const_graph.tail(e);
-	  n = const_graph.head(e);
+	  n = graph.tail(e);
+	  n = graph.head(e);
 	}      
       }
       
-      Graph& graph;
+      const Graph& graph;
     };
 
     /// An empty iterable base graph class.
@@ -645,7 +644,6 @@
     
     template <typename Graph> 
     struct IterableGraphComponentConcept {
-
       void constraints() {
   	function_requires< BaseIterableGraphComponentConcept<Graph> >();
 
@@ -661,7 +659,6 @@
 	function_requires< GraphIncIteratorConcept<OutEdgeIt, Graph> >();
 	function_requires< GraphIncIteratorConcept<InEdgeIt, Graph> >();
       }
-      Graph& graph;
     };