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Close the descriptor.
boost::system::error_code close( boost::system::error_code & ec);
            This function is used to close the descriptor. Any asynchronous read
            or write operations will be cancelled immediately, and will complete
            with the boost::asio::error::operation_aborted error.
          
Set to indicate what error occurred, if any. Note that, even if the function indicates an error, the underlying descriptor is closed.