CTurkeyAdapter到底是鸡还是鸭？

[YXTS122]

#include＜iostream＞ using namespace std; class CDuck { public: virtual ~CDuck(){} virtual void Quack()=0; virtual void Fly()=0; }; class CMallardDuck:public CDuck { public: void Quack() { cout＜＜"绿头鸭，呱呱叫。"＜＜endl; } void Fly() { cout＜＜"绿头鸭在飞行。"＜＜endl; } }; class CTurkey { public: virtual ~CTurkey(){} virtual void Gobble()=0; virtual void Fly()=0; }; class CWildTurkey:public CTurkey { public: void Gobble() { cout＜＜"野生火鸡,咕咕叫"＜＜endl; } void Fly() { cout＜＜"野生火鸡飞行距离短"＜＜endl; } }; class CTurkeyAdapter:public CTurkey { public: CTurkeyAdapter(CTurkey *pTurkey):m_pTurkey(pTurkey) { } void Quack() { m_pTurkey-＞Gobble(); } void Fly() { for (int i=0;i＜5;i++) { m_pTurkey-＞Fly(); } } private: CTurkey *m_pTurkey; }; int main() { int nRetCode=0; CDuck *pDuck=new CMallardDuck(); CTurkey *pTurkey=new CWildTurkey(); CTurkey *pAdapter=new CTurkeyAdapter(pTurkey); cout＜＜"火鸡..."＜＜endl; pTurkey-＞Gobble(); pTurkey-＞Fly(); cout＜＜"\n鸭子..."＜＜endl; pDuck-＞Quack(); pDuck-＞Fly(); cout＜＜"\n火鸡适配器..."＜＜endl; pAdapter-＞Quack(); pAdapter-＞Fly(); return nRetCode; } 写成这样，报错: /data/data/com.n0n3m4.droidc/files/temp.c: In function 'int main()': /data/data/com.n0n3m4.droidc/files/temp.c:66:46: error: invalid new-expression of abstract class type 'CTurkeyAdapter' CTurkey *pAdapter=new CTurkeyAdapter(pTurkey); ^ compilation terminated due to -Wfatal-errors. 写成下面这样就可以运行了: #include＜iostream＞ using namespace std; class CDuck { public: virtual ~CDuck(){} virtual void Quack()=0; virtual void Fly()=0; }; class CMallardDuck:public CDuck { public: void Quack() { cout＜＜"绿头鸭，呱呱叫。"＜＜endl; } void Fly() { cout＜＜"绿头鸭在飞行。"＜＜endl; } }; class CTurkey { public: virtual ~CTurkey(){} virtual void Gobble()=0; virtual void Fly()=0; }; class CWildTurkey:public CTurkey { public: void Gobble() { cout＜＜"野生火鸡,咕咕叫"＜＜endl; } void Fly() { cout＜＜"野生火鸡飞行距离短"＜＜endl; } }; class CTurkeyAdapter:public CDuck { public: CTurkeyAdapter(CTurkey *pTurkey):m_pTurkey(pTurkey) { } void Quack() { m_pTurkey-＞Gobble(); } void Fly() { for (int i=0;i＜5;i++) { m_pTurkey-＞Fly(); } } private: CTurkey *m_pTurkey; }; int main() { int nRetCode=0; CDuck *pDuck=new CMallardDuck(); CTurkey *pTurkey=new CWildTurkey(); CDuck *pAdapter=new CTurkeyAdapter(pTurkey); cout＜＜"火鸡..."＜＜endl; pTurkey-＞Gobble(); pTurkey-＞Fly(); cout＜＜"\n鸭子..."＜＜endl; pDuck-＞Quack(); pDuck-＞Fly(); cout＜＜"\n火鸡适配器..."＜＜endl; pAdapter-＞Quack(); pAdapter-＞Fly(); return nRetCode; } PS:为什么给CTurkeyAdapter做变性手术，搞得男不男，女不女的？

[幻夢之葉]

使用上错了，正确方法如下 CTurkeyAdapter *pAdapter=new CTurkeyAdapter(pTurkey); pAdapter-＞Quack(); pAdapter-＞Fly(); 接口适配器主要用于统一接口 对于一些你不便修改的的情况下（比如得不到源码，公有接口在别人的模块被太多使用不便修改） 比如你CTurkeyAdapter 适配器就是在你不能随意更改CTurkey的接口函数下 而你又想修改公用接口函数的名称，就多加了一层包装 void Quack() { m_pTurkey-＞Gobble(); } 说白了就是换个接口名称或者封装一组操作