模板类中指向派生类的指针的容器，模板参数为公共祖先

#include <iostream>
#include <vector>

class Base {
public:
    virtual void print() {
        std::cout << "Base class" << std::endl;
    }
};

class Derived1 : public Base {
public:
    void print() override {
        std::cout << "Derived1 class" << std::endl;
    }
};

class Derived2 : public Base {
public:
    void print() override {
        std::cout << "Derived2 class" << std::endl;
    }
};

int main() {
    std::vector<Base*> container;
    
    Derived1 d1;
    Derived2 d2;
    
    container.push_back(&d1);
    container.push_back(&d2);
    
    for (auto ptr : container) {
        ptr->print();
    }
    
    return 0;
}