How can I setup a function to return a ref cursor that references an existing cursor?

Hi there,

I am trying to create a database function/procedure that returns a ref cursor that will reference an existing cursor. For example,

CREATE or replace PACKAGE MyLib AS

TYPE curTyp IS REF CURSOR;

function GetCursor(curNum INT) return curTyp;

END MyLib;

/

CREATE or replace PACKAGE BODY MyLib AS

cursor c1 is select * from dept;

cursor c2 is select * from emp;

function GetCursor(curNum INT) return curTyp IS

myCur curTyp;

BEGIN

   -- This doesn't work, but how can I make it work?

   if curNum = 1 then

      OPEN myCur FOR c1;

   else

      OPEN myCur for c2;

   end if;

return myCur;

END;