如何访问类的私有部分中的任何数据？

class MyClass {
private:
    int privateData;

public:
    void setPrivateData(int data) {
        privateData = data;
    }

    int getPrivateData() {
        return privateData;
    }
};

int main() {
    MyClass obj;
    obj.setPrivateData(10);
    int data = obj.getPrivateData();
    // 通过公有方法访问私有数据
    cout << "Private data: " << data << endl;
    return 0;
}

class MyClass {
private:
    int privateData;

public:
    friend void accessPrivateData(MyClass obj);

    void setPrivateData(int data) {
        privateData = data;
    }
};

void accessPrivateData(MyClass obj) {
    // 友元函数可以直接访问私有数据
    cout << "Private data: " << obj.privateData << endl;
}

int main() {
    MyClass obj;
    obj.setPrivateData(10);
    // 调用友元函数访问私有数据
    accessPrivateData(obj);
    return 0;
}