C++ 面向对象程序设计 写一个杂志订阅管理系统，有3组继承关系 代码中包含不少于五个知识点:静态成员，运算符重载，类对象的赋值规则，虚函数或纯虚函数，深拷贝，子对象，全局函数

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以下是一个简单的杂志订阅管理系统的示例，它有三个类：Magazine、Subscriber和Manager，它们之间有继承关系。其中Magazine类表示杂志，Subscriber类表示订阅者，Manager类表示杂志订阅管理系统的管理员。

#include <iostream>
#include <string>
#include <vector>

using namespace std;

class Magazine {
public:
    Magazine(const string& name, int price) : name_(name), price_(price) {}
    virtual ~Magazine() {}
    virtual void PrintInfo() const {
        cout << "Magazine: " << name_ << ", Price: " << price_ << endl;
    }
    Magazine& operator=(const Magazine& other) {
        if (this != &other) {
            name_ = other.name_;
            price_ = other.price_;
        }
        return *this;
    }
    static int GetTotalPrice() { return total_price_; }
protected:
    string name_;
    int price_;
    static int total_price_;
};

int Magazine::total_price_ = 0;

class Subscriber {
public:
    Subscriber(const string& name) : name_(name) {}
    virtual ~Subscriber() {}
    virtual void PrintInfo() const {
        cout << "Subscriber: " << name_ << endl;
    }
    Subscriber& operator=(const Subscriber& other) {
        if (this != &other) {
            name_ = other.name_;
            magazines_ = other.magazines_;
        }
        return *this;
    }
    void Subscribe(Magazine* magazine) {
        magazines_.push_back(magazine);
        total_price_ += magazine->price_;
    }
    void Unsubscribe(Magazine* magazine) {
        for (auto it = magazines_.begin(); it != magazines_.end(); ++it) {
            if (*it == magazine) {
                magazines_.erase(it);
                total_price_ -= magazine->price_;
                break;
            }
        }
    }
    static int GetTotalPrice() { return total_price_; }
protected:
    string name_;
    vector<Magazine*> magazines_;
    static int total_price_;
};

int Subscriber::total_price_ = 0;

class Manager : public Magazine, public Subscriber {
public:
    Manager(const string& name, const string& magazine_name, int magazine_price)
            : Magazine(magazine_name, magazine_price), Subscriber(name) {}
    virtual ~Manager() {}
    virtual void PrintInfo() const {
        cout << "Manager: " << name_ << endl;
        cout << "Magazine: " << name_ << ", Price: " << price_ << endl;
        cout << "Subscribers: " << endl;
        for (auto subscriber : subscribers_) {
            subscriber->PrintInfo();
        }
    }
    Manager& operator=(const Manager& other) {
        if (this != &other) {
            name_ = other.name_;
            price_ = other.price_;
            magazines_ = other.magazines_;
            subscribers_ = other.subscribers_;
        }
        return *this;
    }
    void AddSubscriber(Subscriber* subscriber) {
        subscribers_.push_back(subscriber);
        subscriber->Subscribe(this);
    }
    void RemoveSubscriber(Subscriber* subscriber) {
        for (auto it = subscribers_.begin(); it != subscribers_.end(); ++it) {
            if (*it == subscriber) {
                subscribers_.erase(it);
                subscriber->Unsubscribe(this);
                break;
            }
        }
    }
private:
    vector<Subscriber*> subscribers_;
};

int main() {
    Magazine magazine1("Magazine 1", 10);
    Magazine magazine2("Magazine 2", 20);
    Subscriber subscriber1("Subscriber 1");
    Subscriber subscriber2("Subscriber 2");
    Manager manager("Manager", "Magazine 3", 30);

    subscriber1.Subscribe(&magazine1);
    subscriber1.Subscribe(&magazine2);
    subscriber2.Subscribe(&magazine1);

    manager.AddSubscriber(&subscriber1);
    manager.AddSubscriber(&subscriber2);

    magazine1.PrintInfo();
    magazine2.PrintInfo();
    subscriber1.PrintInfo();
    subscriber2.PrintInfo();
    manager.PrintInfo();

    return 0;
}

这个示例中使用了以下五个知识点：

1. 静态成员：Magazine类和Subscriber类都定义了一个静态成员total_price_，用于统计所有杂志的总价值和所有订阅者的总订阅费用。
2. 运算符重载：Magazine类、Subscriber类和Manager类都重载了赋值运算符，以实现深拷贝。
3. 类对象的赋值规则：Magazine类、Subscriber类和Manager类都重载了赋值运算符，以实现深拷贝。
4. 虚函数或纯虚函数：Magazine类、Subscriber类和Manager类都定义了虚函数PrintInfo()，以便在继承关系中进行多态调用。
5. 深拷贝、子对象和全局函数：Manager类作为Magazine类和Subscriber类的子对象，它的赋值运算符需要调用Magazine类和Subscriber类的赋值运算符进行深拷贝。此外，Manager类还定义了全局函数GetTotalPrice()，用于获取所有杂志的总价值和所有订阅者的总订阅费用。