#include <iostream>
     

     struct Animal {
      virtual ~Animal() {}
     

      virtual Animal* Clone() = 0;
      virtual void ShowName() = 0;
     };
     

     struct Tiger : public Animal {
      Animal* Clone() override { return new Tiger(); }
     

      void ShowName() override { std::cout << "Tiger" << std::endl; }
     };
     

     int main() {
      Animal* animal = new Tiger();
      animal->ShowName();
      Animal* animal_copy = animal->Clone(); // 想要一個和animal完全相同的實例
      animal_copy->ShowName();
      return 0;
     }