Optimization for error_info<throw_function>, error_info<throw_file>, error_info<throw_line>. Refactored exception_ptr to use shared_ptr.

[SVN r48521]

example/logging.cpp

@@ -20,6 +20,6 @@ g()
     catch(
     boost::exception & e )
         {
-        std::cerr << e.diagnostic_information();
+        std::cerr << diagnostic_information(e);
         }
     }