面试：C++工厂模式实现

 #include <iostream>

 enum CTYPE {PRODUCTA,PRODUCTB};
 class Product{
 public:
     virtual void func() = ;
     virtual ~Product(){};
 };

 class ProductA : public Product{
 public:
     void func(){
         std::cout << "create ProductA..." << std::endl;
     }
 };

 class ProductB : public Product{
 public:
     void func(){
         std::cout << "create ProductB..." << std::endl;
     }
 };

 class Factory{
 public:
     static Product* createProduct(enum CTYPE ctype){
         if(ctype == PRODUCTA)
             return new ProductA;
         else if(ctype == PRODUCTB){
             return new ProductB;
         }else
             return nullptr;
     }
 };

 int main(){
     Product* p = Factory::createProduct(CTYPE::PRODUCTA);
     p->func();
     return ;
 }