C++设计模式之适配器模式(Adapter)

//目标接口类，客户需要的接口
class Target
{
public:
  Target(){}
  virtual ~Target(){}
  virtual void Request()//定义新的标准接口
  {
    cout << "Request" << endl;
  }
};

//需要适配的类
class Object
{
public:
  Object(){}
  ~Object(){}
  void SpecificRequest()
  {
    cout << "SpecificRequest" << endl;
  }
};

//类模式，适配器类，通过public继承获得接口继承的效果，通过private继承获得实现继承的效果
class Adapter :public Target, private Object
{
public:
  Adapter(){}
  ~Adapter(){}
  virtual void Request()//实现Target定义的Request接口
  {
    cout << "AdapterRequest" << endl;
    this->SpecificRequest();
    cout << "----------------------------" << endl;
  }
};

//对象模式，适配器类，继承Target类，采用组合的方式实现Object的复用
class Adapter1 :public Target
{
public:
  Adapter1(Object* adaptee) :_adaptee(adaptee)
  {}
  Adapter1() :_adaptee(new Object)
  {}
  ~Adapter1(){}
  virtual void Request()//实现Target定义的Request接口
  {
    cout << "Adapter1Request" << endl;
    _adaptee->SpecificRequest();
    cout << "----------------------------" << endl;
  }
private:
  Object* _adaptee;
};

//client调用
int main()
{
  //类模式Adapter
  Target* pTarget = new Adapter();
  pTarget->Request();

  //对象模式Adapter1
  Adaptee* ade = new Adaptee();
  Target* pTarget1= new Adapter1(ade);
  pTarget1->Request();

  //对象模式Adapter2
  Target* pTarget2 = new Adapter1();
  pTarget2->Request();

  return 0;
}