面试：C++工厂模式实现

 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         }else
32             return nullptr;
33     }
34 };
35 
36 int main(){
37     Product* p = Factory::createProduct(CTYPE::PRODUCTA);
38     p->func();
39     return 0;
40 }