是否可以在C++中创建在运行时确定的类型的指针？

#include <iostream>

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

class Derived : public Base {
public:
    void print() override {
        std::cout << "This is the Derived class." << std::endl;
    }
};

int main() {
    Base* ptr;

    // 在运行时确定类型为Base的指针
    ptr = new Base();
    ptr->print();

    // 在运行时确定类型为Derived的指针
    ptr = new Derived();
    ptr->print();

    delete ptr;

    return 0;
}