Fixes #4115: sometimes VC++ doesn't put typeinfo in namespace std.

[SVN r61434]

include/boost/config/stdlib/dinkumware.hpp

@@ -86,6 +86,11 @@
 #  define BOOST_NO_STD_LOCALE
 #endif
 
+#include <typeinfo>
+#if !_HAS_EXCEPTIONS
+#  define BOOST_NO_STD_TYPEINFO    
+#endif  
+
 //  C++0x headers implemented in 520 (as shipped by Microsoft)
 //
 #if !defined(_CPPLIB_VER) || _CPPLIB_VER < 520

include/boost/config/suffix.hpp

@@ -554,6 +554,12 @@ namespace boost{
 
 #endif // defined BOOST_NO_EXPLICIT_FUNCTION_TEMPLATE_ARGUMENTS
 
+// When BOOST_NO_STD_TYPEINFO is defined, we can just import
+// the global definition into std namespace:
+#ifdef BOOST_NO_STD_TYPEINFO
+#include <typeinfo>
+namespace std{ using ::typeinfo; }
+#endif
 
 // ---------------------------------------------------------------------------//