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            Move-assign a basic_raw_socket from a socket
            of another protocol type.
          
template< typename Protocol1, typename Executor1> constraint_t< is_convertible< Protocol1, Protocol >::value &&is_convertible< Executor1, Executor >::value, basic_raw_socket & > operator=( basic_raw_socket< Protocol1, Executor1 > && 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.