Index: boost/exception/exception.hpp
===================================================================
--- boost/exception/exception.hpp	(revision 59837)
+++ boost/exception/exception.hpp	(working copy)
@@ -401,6 +401,14 @@
                 copy_boost_exception(this,&x);
                 }
 
+            template <class VirtualBase>
+            clone_impl( T const & x, VirtualBase & vb ):
+                VirtualBase(vb),
+                T(x)
+                {
+                copy_boost_exception(this,&x);
+                }
+
             ~clone_impl() throw()
                 {
                 }
@@ -428,6 +436,14 @@
         {
         return exception_detail::clone_impl<T>(x);
         }
+
+    template <class T,class VirtualBase>
+    inline
+    exception_detail::clone_impl<T>
+    enable_current_exception( T const & x, VirtualBase const & vb )
+        {
+        return exception_detail::clone_impl<T>(x,vb);
+        }
     }
 
 #if defined(_MSC_VER) && !defined(BOOST_EXCEPTION_ENABLE_WARNINGS)
Index: boost/throw_exception.hpp
===================================================================
--- boost/throw_exception.hpp	(revision 59836)
+++ boost/throw_exception.hpp	(working copy)
@@ -67,6 +67,11 @@
 
 void throw_exception( std::exception const & e ); // user defined
 
+template<class E,class VirtualBase> BOOST_ATTRIBUTE_NORETURN inline void throw_exception( E const & e, VirtualBase const & )
+{
+    return throw_exception(e);
+}
+
 #else
 
 inline void throw_exception_assert_compatibility( std::exception const & ) { }
@@ -84,8 +89,21 @@
 #endif
 }
 
+template<class E,class VirtualBase> BOOST_ATTRIBUTE_NORETURN inline void throw_exception( E const & e, VirtualBase const & vb )
+{
+    //All boost exceptions are required to derive from std::exception,
+    //to ensure compatibility with BOOST_NO_EXCEPTIONS.
+    throw_exception_assert_compatibility(e);
+
+#ifndef BOOST_EXCEPTION_DISABLE
+    throw enable_current_exception(enable_error_info(e),vb);
+#else
+    throw e;
 #endif
+}
 
+#endif
+
 } // namespace boost
 
 #endif // #ifndef BOOST_THROW_EXCEPTION_HPP_INCLUDED
Index: libs/exception/test/Jamfile.v2
===================================================================
--- libs/exception/test/Jamfile.v2	(revision 59836)
+++ libs/exception/test/Jamfile.v2	(working copy)
@@ -37,6 +37,7 @@
 run no_exceptions_test.cpp : : : <exception-handling>off ;
 run errinfos_test.cpp ;
 run exception_ptr_test.cpp /boost//thread : : : <threading>multi ;
+run virtual_base_test.cpp ;
 compile-fail exception_fail.cpp ;
 compile-fail throw_exception_fail.cpp ;
 compile-fail error_info_const_fail.cpp ;
Index: libs/exception/test/virtual_base_test.cpp
===================================================================
--- libs/exception/test/virtual_base_test.cpp	(revision 0)
+++ libs/exception/test/virtual_base_test.cpp	(revision 0)
@@ -0,0 +1,34 @@
+//Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc.
+
+//Distributed under the Boost Software License, Version 1.0. (See accompanying
+//file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/throw_exception.hpp>
+#include <boost/detail/lightweight_test.hpp>
+#include <stdexcept>
+
+struct
+err:
+    virtual boost::exception,
+    virtual std::runtime_error
+    {
+    err():
+        std::runtime_error("what")
+        {
+        }
+    };
+
+int
+main()
+    {
+    try
+        {
+        boost::throw_exception(err(),std::runtime_error("what"));
+        }
+    catch(
+    err & e )
+        {
+        BOOST_TEST(dynamic_cast<boost::exception_detail::clone_base *>(&e)!=0);
+        }
+    return boost::report_errors();
+    }