Design Patterns Explained

Example 15-2 C++ Code Fragments (continued)
Decorator::Decorator( Component *myC)
{ myComp= myC;
}
Decorator::prtTicket() { if
(myComp != 0)
myComp->prtTicket();
}
class Headerl : public Decorator
{ public:
void prtTicketO ;
}
Headerl::prtTicket () {
// place printing header 1 code here
Decorator: :prtTicketO ;
}
class Header2 : public Decorator
{ public:
void prtTicketO ;
}
Header2::prtTicket (} {
// place printing header 2 code here
Decorator::prtTicket 0 ;
}
class Footerl : public Decorator
{ public:
void prtTicket(};
}
Footerl::prtTicket (} {
Decorator: :prtTicketO ;
// place printing footer 1 code here
}
class Footer2 : public Decorator
{ public:
void prtTicketO;
}
Footer2::prtTicket (} {
Decorator: :prtTicketO ;
// place printing footer 2 code here
}
SalesOrder::prtTicket () {
Chapter 15 • The Decorator Pattern 253
(continued)