如何在C++中重写后调用原始函数？

#include<iostream>

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

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

int main() {
    Derived d;
    d.myFunction();
    return 0;
}

#include<iostream>
#include<functional>

void originalFunction() {
    std::cout << "Original function"<< std::endl;
}

void newFunction() {
    std::cout << "New function"<< std::endl;
    originalFunction();
}

int main() {
    std::function<void()> func = newFunction;
    func();
    return 0;
}