Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Boost Exception

namespace
boost
    {
    template <class T>
    exception_ptr copy_exception( T const & e );
    }

As if

try
    {
    throw enable_current_exception(e);
    }
catch(...)
    {
    return current_exception();
    }