diff -r 632a72b27123 -r 40bbb450143e lemon/bits/map_extender.h
--- a/lemon/bits/map_extender.h	Tue Apr 12 07:46:34 2011 +0200
+++ b/lemon/bits/map_extender.h	Wed Jul 13 14:40:05 2011 +0200
@@ -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;