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basic_serial_port without opening
template< typename ExecutionContext> basic_serial_port( ExecutionContext & context, typename constraint< is_convertible< ExecutionContext &, execution_context & >::value, defaulted_constraint >::type = defaulted_constraint());
This constructor creates a serial port without opening it.
An execution context which provides the I/O executor that the serial port will use, by default, to dispatch handlers for any asynchronous operations performed on the serial port.