diff -r 58c330ad0b5c -r 6be1f9bd2ac0 lemon/bits/map_extender.h
--- a/lemon/bits/map_extender.h	Sun Oct 04 10:15:32 2009 +0200
+++ b/lemon/bits/map_extender.h	Wed Dec 09 11:14:06 2009 +0100
@@ -49,6 +49,8 @@
     typedef typename Parent::Reference Reference;
     typedef typename Parent::ConstReference ConstReference;
 
+    typedef typename Parent::ReferenceMapTag ReferenceMapTag;
+
     class MapIt;
     class ConstMapIt;
 
@@ -191,6 +193,8 @@
     typedef typename Parent::Reference Reference;
     typedef typename Parent::ConstReference ConstReference;
 
+    typedef typename Parent::ReferenceMapTag ReferenceMapTag;
+
     class MapIt;
     class ConstMapIt;