Move-assign a basic_raw_socket
from another.
basic_raw_socket & operator=( basic_raw_socket && other);
This assignment operator moves a raw socket from one object to another.
The other basic_raw_socket
object
from which the move will occur.
Following the move, the moved-from object is in the same state as if
constructed using the basic_raw_socket(const executor_type&)
constructor.