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            Construct a posix::basic_descriptor on an existing
            native descriptor.
          
basic_descriptor( boost::asio::io_service & io_service, const native_handle_type & native_descriptor);
This constructor creates a descriptor object to hold an existing native descriptor.
                  The io_service object that
                  the descriptor will use to dispatch handlers for any asynchronous
                  operations performed on the descriptor.
                
A native descriptor.
Thrown on failure.