class Dog
{
public:
    Dog()
    {
        m_Name = "小狗狗";
        m_Info = "田园狗";
        m_Test = "测试";
    }
    void showTest()
    {
        cout << "Test:" << m_Test << endl;
    }
    void showGood()
    {
        cout << "Good:" << "morning" << endl;
    }
public:
    std::string m_Name;
    std::string m_Info;
private:
    std::string m_Test;
    void showAgain() //  私有的函数,外部不能赋值给成员函数指针和成员变量
    {
        cout << "hhh" << endl;
    }
};

int main()
{
    Dog dog;
    unique_ptr<Dog> pDog(new Dog);

    /********数据成员指针*********/
    string Dog::* p_dog;
    p_dog = &Dog::m_Name;
    cout << dog.*p_dog << endl; // 使用

    auto p_dog_info = &Dog::m_Info;
    cout << pDog.get()->*p_dog_info << endl; // 使用

    // 数据成员指针只能读取,不能写入

    /********成员函数指针*********/
    auto p_func = &Dog::showTest;
    void(Dog:: * p_func_1)() = &Dog::showGood;
    (dog.*p_func)(); // 使用成员函数指针
    (pDog.get()->*p_func_1)(); // 使用

    return 0;
}

输出:

小狗狗
田园狗
Test:测试
Good:morning