如何为作为基类存储在std::vector中的派生类编写重载函数

#include <iostream>
#include <vector>

class Base {
public:
    virtual ~Base() = 0; // 纯虚析构函数
    virtual void foo() const {
        std::cout << "Base::foo()" << std::endl;
    }
};

Base::~Base() {}

class Derived : public Base {
public:
    void foo() const override {
        std::cout << "Derived::foo()" << std::endl;
    }
};

int main() {
    std::vector<Base*> vec;
    vec.push_back(new Derived());
    vec.push_back(new Base());

    for (const auto& obj : vec) {
        obj->foo(); // 调用派生类的重载函数
    }

    // 释放内存
    for (const auto& obj : vec) {
        delete obj;
    }

    return 0;
}