C++重载下标运算符[ ]

class Name
{
    //重载的输出运算符，声明为类的友元函数
    friend ostream& operator<<(ostream& o, const Name& other);
private:
    string FirstName;
    string MidName;
    string LastName;
};

//输出运算符重载为全局函数
ostream& operator<<(ostream& o, const Name& other)
{
    cout << other.FirstName << " " << other.MidName << " " << other.LastName;
    return o;
}

main函数里的测试代码：

int main()
{   
    Name name;
    name[0] = "FF";
    name[1] = "MM";
    name[2] = "LL";
    cout << name;
    return 0;
}

运行效果：

class Name
{
    //重载的输出运算符，声明为类的友元函数
    friend ostream& operator<<(ostream& o, const Name& other);
public:
    //重载的下标运算符
    string& operator[](int index)
    {
        switch (index)
        {
        case 0:
            return FirstName;
        case 1:
            return MidName;
        case 2:
            return LastName;
        }
    }
private:
    string FirstName;
    string MidName;
    string LastName;
};