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            Move-assign a basic_socket_acceptor from another.
          
basic_socket_acceptor & operator=( basic_socket_acceptor && 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(io_service&) constructor.