如何从同一类的另一个成员函数中调用函数器？

#include <iostream>

class MyClass {
public:
    void memberFunction1() {
        std::cout << "This is member function 1." << std::endl;
    }

    void memberFunction2() {
        std::cout << "This is member function 2." << std::endl;

        // 调用函数器
        functionObject();
    }

private:
    // 函数器
    void functionObject() {
        std::cout << "This is the function object." << std::endl;
    }
};

int main() {
    MyClass obj;
    obj.memberFunction1();
    obj.memberFunction2();

    return 0;
}

This is member function 1.
This is member function 2.
This is the function object.