Index: boost/function/function_base.hpp
===================================================================
--- boost/function/function_base.hpp	(revision 52122)
+++ boost/function/function_base.hpp	(working copy)
@@ -262,6 +262,11 @@
           A(a)
         {
         }
+        functor_wrapper(const functor_wrapper& f):
+          F(static_cast<const F&>(f)),
+          A(static_cast<const A&>(f))
+        {
+        }
       };
 
       /**