diff -r c00f6ebbe1e6 -r e63a1dda5c68 src/include/maps.h
--- a/src/include/maps.h	Tue May 04 16:16:49 2004 +0000
+++ b/src/include/maps.h	Tue May 04 16:17:17 2004 +0000
@@ -26,6 +26,9 @@
 
     T operator[](const K&) const { return T(); }
     void set(const K&, const T&) {}
+    ///\bug when update is removed from map concepts by being dynamic
+    ///stuffs, this line have to be removed.
+    void update() { }
   };