动态的给一个类添加功能，比生成子类更灵活，代理模式的扩展；
#include <iostream>
using namespace std;
class Fruit
{
public:
virtual void getFruit() = 0;
protected:
private:
};
class Banana : public Fruit //实现关系
{
public:
virtual void getFruit()
{
cout << "我是香蕉...." << endl;
}
protected:
private:
};
class south_Banana : public Fruit //实现关系
{
public:
south_Banana(Fruit* myFruit)
{
ptrFruit = myFruit;
}
virtual void getFruit()
{
ptrFruit->getFruit();
cout << "但我是南方香蕉...." << endl;
}
public:
Fruit* ptrFruit;
};
class big_Banana : public Fruit //实现关系
{
public:
big_Banana(Fruit* myFruit)
{
ptrFruit = myFruit;
}
virtual void getFruit()
{
ptrFruit->getFruit();
cout << "但我是大香蕉...." << endl;
}
public:
Fruit* ptrFruit;
};
void main()
{
Fruit* ptr = new Banana();
ptr->getFruit();
Fruit*ptr1 = new south_Banana(ptr);
ptr1->getFruit();
Fruit*ptr2 = new big_Banana(ptr1);
ptr2->getFruit();
Fruit*ptr3 = new south_Banana(ptr2);
ptr3->getFruit();
delete ptr3;
delete ptr2;
delete ptr1;
delete ptr;
return;
}
