--- a/src/core/traced-value.h	Thu Apr 10 13:16:43 2008 -0700
+++ b/src/core/traced-value.h	Thu Apr 10 15:04:47 2008 -0400
@@ -118,6 +118,12 @@
   TracedCallback<T,T> m_cb;
 };
 
+template <typename T>
+std::ostream& operator << (std::ostream& os, const TracedValue<T>& rhs)
+{
+  return os<<rhs.Get();
+}
+
 template <typename T, typename U>
 bool operator == (const TracedValue<T> &lhs, const TracedValue<U> &rhs)
 {