友元c++

#include <iostream>
#include <string>

using namespace std;
class Lovers//爱人关系,基类
{
public:
    Lovers(string theName);//
    void kiss(Lovers *lover);
    void ask(Lovers *lover, string something);

protected:
    string name;

    friend class Others; //祸根，交友不慎。。。。 (友元关系),则Others可以访问name
};

class Boyfriend:public Lovers//Boyfriend子类，继承Lovers基类
{
public:
    Boyfriend(string theName);
};
class Girlfriend:public Lovers//girlfriend子类，继承Lovers基类
{
public:
    Girlfriend(string theName);
};

class Others//Others类 ,并没继承Lovers基类
{
public:
    Others(string theName);
    void kiss(Lovers *lover);

protected:
    string name;
};

Lovers::Lovers(string theName)//Lovers类的构造函数
{
    name = theName;
}
void Lovers::kiss(Lovers *lover)//Lovers *lover表示定义Lovers类的一个对象*lover
{
    cout << name << "亲亲我们家的" << lover->name << endl;
}
void Lovers::ask(Lovers *lover,string something)
{
    cout << "宝贝儿" << lover->name << "帮我" << something << endl;
}
Boyfriend::Boyfriend(string theName):Lovers(theName)
{
}
Girlfriend::Girlfriend(string theName):Lovers(theName)
{
}
Others::Others(string theName)
{
    name = theName;
}
void Others::kiss(Lovers *lover)
{
    cout << name << "亲一下" << lover->name << endl;
}
int main()
{
    Boyfriend boyfriend("A君");
    Girlfriend girlfriend("B妞");

    Others others("路人甲");

    girlfriend.kiss(&boyfriend);
    girlfriend.ask(&boyfriend,"洗衣服啦");

    cout << "\n当当当当！传说中的路人甲登场啦。。。。\n";
    others.kiss(&girlfriend);

    return 0;
}