|  | 
            Move-assign a basic_socket_acceptor from an
            acceptor of another protocol type.
          
template< typename Protocol1, typename Executor1> constraint_t< is_convertible< Protocol1, Protocol >::value &&is_convertible< Executor1, Executor >::value, basic_socket_acceptor & > operator=( basic_socket_acceptor< Protocol1, Executor1 > && other);
This assignment operator moves an acceptor from one object to another.
                  The other basic_socket_acceptor
                  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_socket_acceptor(const executor_type&)
            constructor.