diff -r c7bd55c0d820 -r 28df5272df99 lemon/bits/graph_adaptor_extender.h
--- a/lemon/bits/graph_adaptor_extender.h	Fri Apr 07 09:51:23 2006 +0000
+++ b/lemon/bits/graph_adaptor_extender.h	Fri Apr 07 09:52:30 2006 +0000
@@ -720,6 +720,24 @@
       return e.direction ? target(e) : source(e);
     }
 
+    Node oppositeNode(const Node &n, const UEdge &e) const {
+      if( n == Parent::source(e))
+	return Parent::target(e);
+      else if( n == Parent::target(e))
+	return Parent::source(e);
+      else
+	return INVALID;
+    }
+
+    Edge oppositeEdge(const Edge &e) const {
+      return Parent::direct(e, !Parent::direction(e));
+    }
+
+    using Parent::direct;
+    Edge direct(const UEdge &ue, const Node &s) const {
+      return Parent::direct(ue, Parent::source(ue) == s);
+    }
+
   };