diff -r 9f529abcaebf -r 703ebf476a1d lemon/bits/map_extender.h
--- a/lemon/bits/map_extender.h	Thu Jun 11 23:13:24 2009 +0200
+++ b/lemon/bits/map_extender.h	Thu Aug 20 20:34:30 2009 +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;