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

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Boost Exception

copy_exception

#include <boost/exception_ptr.hpp>

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

Effects:

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