diff -r 11404088d1a5 -r 3fc2a801c39e lemon/bits/map_extender.h
--- a/lemon/bits/map_extender.h	Fri Sep 25 12:24:16 2009 +0200
+++ b/lemon/bits/map_extender.h	Sat Sep 26 07:08:10 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;