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#### basic_serial_port::lowest_layer_type

A basic_serial_port is always the lowest layer.

    typedef basic_serial_port< SerialPortService > lowest_layer_type;

###### Types

Name | Description
--- | ---
implementation_type | The underlying implementation type of I/O object.
lowest_layer_type | A basic_serial_port is always the lowest layer.
native_type | The native representation of a serial port.
service_type | The type of the service that will be used to provide I/O operations.

###### Member Functions

Name | Description
--- | ---
assign | Assign an existing native serial port to the serial port.
async_read_some | Start an asynchronous read.
async_write_some | Start an asynchronous write.
basic_serial_port | Construct a basic_serial_port without opening it. Construct and open a basic_serial_port. Construct a basic_serial_port on an existing native serial port.
cancel | Cancel all asynchronous operations associated with the serial port.
close | Close the serial port.
get_io_service | Get the io_service associated with the object.
get_option | Get an option from the serial port.
io_service | (Deprecated: use get_io_service().) Get the io_service associated with the object.
is_open | Determine whether the serial port is open.
lowest_layer | Get a reference to the lowest layer. Get a const reference to the lowest layer.
native | Get the native serial port representation.
open | Open the serial port using the specified device name.
read_some | Read some data from the serial port.
send_break | Send a break sequence to the serial port.
set_option | Set an option on the serial port.
write_some | Write some data to the serial port.

###### Protected Data Members

Name | Description
--- | ---
implementation | The underlying implementation of the I/O object.
service | The service associated with the I/O object.

The basic_serial_port class template provides functionality that is common to all serial ports.

###### Thread Safety

Distinct objects: Safe.

Shared objects: Unsafe.