diff -r 2ba916d7aae3 -r 2ff283124dfc lemon/list_graph.h
--- a/lemon/list_graph.h	Mon Mar 06 09:38:19 2006 +0000
+++ b/lemon/list_graph.h	Mon Mar 06 10:28:37 2006 +0000
@@ -23,6 +23,7 @@
 ///\file
 ///\brief ListGraph, ListUGraph classes.
 
+#include <lemon/bits/base_extender.h>
 #include <lemon/bits/graph_extender.h>
 
 #include <lemon/error.h>
@@ -320,9 +321,11 @@
   ///it also provides several additional useful extra functionalities.
   ///\sa concept::ErasableGraph.
 
-  class ListGraph : public ExtendedListGraphBase 
-  {
+  class ListGraph : public ExtendedListGraphBase {
   public:
+
+    typedef ExtendedListGraphBase Parent;
+
     /// Changes the target of \c e to \c n
 
     /// Changes the target of \c e to \c n
@@ -446,8 +449,8 @@
     ///
     ///\warning Edge and node deletions cannot be restored.
     ///\warning Snapshots cannot be nested.
-    class Snapshot : protected AlterationNotifier<Node>::ObserverBase,
-		     protected AlterationNotifier<Edge>::ObserverBase
+    class Snapshot : protected Parent::NodeNotifier::ObserverBase,
+		     protected Parent::EdgeNotifier::ObserverBase
     {
     public:
       
@@ -459,7 +462,7 @@
       };
             
 
-      protected:
+    protected:
       
       ListGraph *g;
       std::list<Node> added_nodes;
@@ -490,17 +493,13 @@
 
       void regist(ListGraph &_g) {
 	g=&_g;
-	AlterationNotifier<Node>::ObserverBase::
-	  attach(g->getNotifier(Node()));
-	AlterationNotifier<Edge>::ObserverBase::
-	  attach(g->getNotifier(Edge()));
+	Parent::NodeNotifier::ObserverBase::attach(g->getNotifier(Node()));
+	Parent::EdgeNotifier::ObserverBase::attach(g->getNotifier(Edge()));
       }
             
       void deregist() {
-	AlterationNotifier<Node>::ObserverBase::
-	  detach();
-	AlterationNotifier<Edge>::ObserverBase::
-	  detach();
+	Parent::NodeNotifier::ObserverBase::detach();
+	Parent::EdgeNotifier::ObserverBase::detach();
 	g=0;
       }