Construct a basic_serial_port without opening it.

basic_serial_port(
    asio::io_service & io_service);

basic_serial_port(
    asio::io_service & io_service,
    const char * device);

basic_serial_port(
    asio::io_service & io_service,
    const std::string & device);

basic_serial_port(
    asio::io_service & io_service,
    const native_type & native_serial_port);