Index: cast.hpp
===================================================================
RCS file: /cvsroot/boost/boost/boost/cast.hpp,v
retrieving revision 1.23
diff -u -r1.23 cast.hpp
--- cast.hpp	4 Sep 2004 10:34:31 -0000	1.23
+++ cast.hpp	19 Apr 2005 07:21:50 -0000
@@ -294,7 +294,10 @@
         // will work with every compiler I know of.
         template <class X, class Y>
         static inline bool check(X x, Y)
-            { return static_cast<X>(static_cast<Y>(x)) != x; }
+            { return 
+                ( static_cast<X>(static_cast<Y>(x)) != x )
+                || ( static_cast< Y >(x) < 0 ) ;
+            }
     };
   
 #else // use #pragma hacks if available