decorator

最新推荐文章于 2025-08-20 01:02:11 发布

原创最新推荐文章于 2025-08-20 01:02:11 发布 · 357 阅读

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#decorator #header #class #delete #include

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本文通过一个具体的例子展示了装饰者模式在C++中的实现过程。该模式允许在不修改原始类的情况下增加职责或行为，通过继承和组合的方式，将额外的功能附加到对象上。文章详细解释了如何使用装饰者模式来扩展销售票据打印功能。

#include <iostream>
using namespace std;
class Component
{
public:
virtual void prtTicket() = 0;
};
class SalesTicket:public Component
{
public:
void prtTicket()
{
    cout << "SalesTicket::PrtTicket" << endl;
}
};
class Decorator : public Component
{
public:
void prtTicket()
{
    if (myComp != 0)
      myComp->prtTicket();
}
Decorator( Component *myC)
{
    myComp = myC;
}
private:
Component * myComp;
};
class Header1 : public Decorator
{
public:
Header1(Component *myC):Decorator(myC){}
void prtTicket()
{
    cout << "Header1" << endl;
    Decorator::prtTicket();
}
};
class Header2 : public Decorator
{
public:
Header2(Component *);
void prtTicket()
{
    cout << "Header2" << endl;
    Decorator::prtTicket();
}
};
class Footer1 : public Decorator
{
public:
Footer1(Component *myC):Decorator(myC){}
void prtTicket()
{
    Decorator::prtTicket();
    cout << "Footer1" << endl;
}
};
class Footer2 : public Decorator
{
public:
Footer2(Component *);
void prtTicket()
{
    Decorator::prtTicket();
    cout << "Footer2" << endl;
}
};
class Configuration
{
private:
Header1 *hd1;
Header2 *hd2;
Footer1 *ft1;
Footer2 *ft2;
public:
Configuration()
{
    /*
    hd1 = new Header1;  //
    hd2 = new Header2;
    ft1 = new Footer1;
    ft2 = new Footer2;*/
}
~Configuration()
{
    /*
    delete hd1;
    delete hd2;
    delete ft1;
    delete ft2;*/
}
public:
static Component* getsalesTicket()
{
     return new Header1(
                 new Footer1(
         new SalesTicket
     )
             );
}
};

class SalesOrder
{
public:
void prtTicket()
{
    Component *myST;
    myST = Configuration::getsalesTicket();
    myST->prtTicket();
}
};
using namespace std;
int
main()
{
   SalesOrder so;
   so.prtTicket();
//Header1 * hd1 = new Header1(new SalesTicket);
return 0;
}