1 #include <iostream> 2  3 enum CTYPE {PRODUCTA,PRODUCTB}; 4 class Product{ 5 public: 6     virtual void func() = 0; 7     virtual ~Product(){}; 8 }; 9 10 class ProductA : public Product{11 public:12     void func(){13         std::cout << "create ProductA..." << std::endl;14     }15 };16 17 class ProductB : public Product{18 public:19     void func(){20         std::cout << "create ProductB..." << std::endl;21     }22 };23 24 class Factory{25 public:26     static Product* createProduct(enum CTYPE ctype){27         if(ctype == PRODUCTA)28             return new ProductA;29         else if(ctype == PRODUCTB){30             return new ProductB;31         }else32             return nullptr;33     }34 };35 36 int main(){37     Product* p = Factory::createProduct(CTYPE::PRODUCTA);38     p->func();39     return 0;40 }