Index: boost/function/function_template.hpp
===================================================================
RCS file: /cvsroot/boost/boost/boost/function/function_template.hpp,v
retrieving revision 1.52
diff -u -p -r1.52 function_template.hpp
--- boost/function/function_template.hpp	8 Oct 2002 02:32:38 -0000	1.52
+++ boost/function/function_template.hpp	4 Nov 2002 16:05:50 -0000
@@ -539,6 +539,10 @@ class function<BOOST_FUNCTION_PARTIAL_SP
   friend class holder;
 
 public:
+  // add signature for boost::lambda
+  template <class Args>
+  struct sig { typedef internal_result_type type; };
+
   typedef typename base_type::allocator_type allocator_type;
 
   function() : base_type() {}