diff -r 5222a3c470ed -r 6aa6fcaeaea5 lemon/bits/traits.h
--- a/lemon/bits/traits.h	Tue Jul 22 11:29:57 2008 +0000
+++ b/lemon/bits/traits.h	Fri Sep 19 15:14:41 2008 +0000
@@ -224,8 +224,8 @@
     typedef typename Map::Key Key;
     typedef typename Map::Value Value;
 
-    typedef const Value ConstReturnValue;
-    typedef const Value ReturnValue;
+    typedef Value ConstReturnValue;
+    typedef Value ReturnValue;
   };
 
   template <typename Map>
@@ -252,8 +252,8 @@
     typedef typename MatrixMap::SecondKey SecondKey;
     typedef typename MatrixMap::Value Value;
 
-    typedef const Value ConstReturnValue;
-    typedef const Value ReturnValue;
+    typedef Value ConstReturnValue;
+    typedef Value ReturnValue;
   };
 
   template <typename MatrixMap>