Boost Exception

namespace
boost
    {
    template <class T>
    std::string diagnostic_information( T const & x );
    }

Platform-specific diagnostic information about x.

If dynamic_cast<std::exception const *>(&x) is not null, the returned string includes the output from std::exception::what.
If dynamic_cast<boost::exception const *>(&x) is not null, the returned string includes the output from boost::exception::diagnostic_information.