Function unpack_error_id

include/boost/leaf/handle_errors.hpp:20–27

namespace detail
{
    inline error_id unpack_error_id(std::exception const & ex) noexcept
    {
        if( detail::exception_base const * eb = dynamic_cast<detail::exception_base const *>(&ex) )
            return eb->get_error_id();
        if( error_id const * err_id = dynamic_cast<error_id const *>(&ex) )
            return *err_id;
        return current_error();
    }
}

#endif // #ifndef BOOST_LEAF_NO_EXCEPTIONS