Headfirst设计模式的C++实现——适配器(Adapter)

duck.h

 #ifndef _DUCK_H_
 #define _DUCK_H_

 class DUCK {
 public:
     virtual void quack() = ;
     virtual void fly() = ;
 };
 #endif

mallard_duck.h

 #ifndef _MALLARD_DUCK_H_
 #define _MALLARD_DUCK_H_

 #include "duck.h"
 #include <iostream>

 class MALLARD_DUCK : public DUCK {
 public:
     void quack() { std::cout << "mallard duck quack" << std::endl; }
     void fly() { std::cout << "mallard duck fly" << std::endl; }
 };
 #endif

turkey.h

 #ifndef _TURKEY_H_
 #define _TURKEY_H_

 #include <iostream>

 class TURKEY {
 public:
     void gobble() { std::cout << "turkey gobble" << std::endl; }
     void fly() { std::cout << "turkey fly" << std::endl; }
 };

 #endif

turkey_adapter.h

 #ifndef _TURKEY_ADAPTER_H_
 #define _TURKEY_ADAPTER_H_

 #include "turkey.h"
 class TURKEY_ADAPTER : public DUCK{
 private:
     TURKEY &turkey;
 public:
     TURKEY_ADAPTER( TURKEY &_turkey) : turkey(_turkey) {}
     void quack() { turkey.gobble(); }
     void fly() {
         for ( int i = ; i < ; i++ ) {
             turkey.fly();
         }
     }
 };
 #endif

main.cpp

 #include "mallard_duck.h"
 #include "turkey_adapter.h"

 void test_duck( DUCK &p ) {
     p.quack();
     p.fly();
 }

 int main() {
     MALLARD_DUCK mallard_duck;
     test_duck( mallard_duck ); 

     TURKEY turkey;
     TURKEY_ADAPTER turkey_adapter(turkey);
     test_duck( turkey_adapter );
 }