Oracle Database Discussions

CREATE OR REPLACE FUNCTION ac_data (p_id IN VARCHAR)
RETURN tab_state
PIPELINED
AS
ac_data tab_state;
out_data tab_state;

 CURSOR ac\_c   
 IS  
      SELECT \*  
        FROM EMPLOYEE\_DETAILS  
       WHERE     ID = p\_id                    

BEGIN
FOR ac_data IN ac_c
LOOP
PIPE ROW ( (ac_data));
END LOOP;
END ac_data ;

Here how will store the pipe row data to another variable?. I need count of ac_data.