eref.h

# ifndef EREF_H
# define EREF_H
 
#include "employee.h"
 
typedef int eref;
 
#include "eref.lh"
 
# define eref_undefined -1
 
# define eref_isDefined(e)    ((e) != eref_undefined)
# define eref_equal(er1, er2) ((er1) == (er2))
 
# endif