C++设计模式之工厂模式

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//简单工厂方法enum CTYPE {COREA, COREB};   class SingleCore  {  public:      virtual void Show() = 0;};  //单核A  class SingleCoreA: public SingleCore  {  public:      void Show() { cout<<"SingleCore A"<<endl; }  };  //单核B  class SingleCoreB: public SingleCore  {  public:      void Show() { cout<<"SingleCore B"<<endl; }  };  //唯一的工厂，可以生产两种型号的处理器核，在内部判断  class Factory  {  public:       SingleCore* CreateSingleCore(enum CTYPE ctype)      {          if(ctype == COREA) //工厂内部判断              return new SingleCoreA(); //生产核A          else if(ctype == COREB)              return new SingleCoreB(); //生产核B          else              return NULL;      }  }; //工厂方法class SingleCore  {  public:      virtual void Show() = 0;};  //单核A  class SingleCoreA: public SingleCore  {  public:      void Show() { cout<<"SingleCore A"<<endl; }  };  //单核B  class SingleCoreB: public SingleCore  {  public:      void Show() { cout<<"SingleCore B"<<endl; }  };  class Factory  {  public:      virtual SingleCore* CreateSingleCore() = 0;};  //生产A核的工厂  class FactoryA: public Factory  {  public:      SingleCoreA* CreateSingleCore() { return new SingleCoreA; }  };  //生产B核的工厂  class FactoryB: public Factory  {  public:      SingleCoreB* CreateSingleCore() { return new SingleCoreB; }  }; //抽象工厂方法//单核  class SingleCore   {  public:      virtual void Show() = 0;};  class SingleCoreA: public SingleCore    {  public:      void Show() { cout<<"Single Core A"<<endl; }  };  class SingleCoreB :public SingleCore  {  public:      void Show() { cout<<"Single Core B"<<endl; }  };  //多核  class MultiCore    {  public:      virtual void Show() = 0;};  class MultiCoreA : public MultiCore    {  public:      void Show() { cout<<"Multi Core A"<<endl; }   };  class MultiCoreB : public MultiCore    {  public:      void Show() { cout<<"Multi Core B"<<endl; }  };  //工厂  class CoreFactory    {  public:      virtual SingleCore* CreateSingleCore() = 0;    virtual MultiCore* CreateMultiCore() = 0;};  //工厂A，专门用来生产A型号的处理器  class FactoryA :public CoreFactory  {  public:      SingleCore* CreateSingleCore() { return new SingleCoreA(); }      MultiCore* CreateMultiCore() { return new MultiCoreA(); }  };  //工厂B，专门用来生产B型号的处理器  class FactoryB : public CoreFactory  {  public:      SingleCore* CreateSingleCore() { return new SingleCoreB(); }      MultiCore* CreateMultiCore() { return new MultiCoreB(); }  };
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