#include <iostream>

#include <list>

#include <string>

using namespace std;

class Observer

{

public:

    Observer() {}

    virtual ~Observer() {}

    virtual void Update() {}

};

class Blog

{

public:

    Blog(){}

    virtual ~Blog() {}

    void Attach(Observer *observer)

    {

        m_observers.push_back(observer);

    }

    void Remove(Observer* observer)

    {

        m_observers.remove(observer);

    }

    void Notify()

    {

        list<Observer*>::iterator iter = m_observers.begin();

        for(;iter != m_observers.end(); iter++)

            (*iter)->Update();

    }

    virtual void SetStatus(string s)

    {

        m_status = s;

    }

    virtual std::string GetStatus()

    {

        return m_status;

    }

private:

    list<Observer* > m_observers;

protected:

    std::string m_status;

};

class BlogBKY : public Blog

{

public:

    BlogBKY(string name):m_name(name) {}

    ~BlogBKY() {}

    void SetStatus(string s)

    {

        m_status = s ;

    }

    string GetStatus()

    {

        return m_status;

    }

private:

    string m_name;

};

class ObserverBlog : public Observer

{

public:

    ObserverBlog(string name,Blog *blog):m_name(name),m_blog(blog)

    {

    }

    ~ObserverBlog() {}

    void Update()

    {

        std::string status = m_blog->GetStatus();

        cout << m_name  <<"-------" << status <<endl;

    }

private:

    std::string m_name;

    Blog *m_blog;

};

#include "observer.h"

int main()

{

    Blog *blog = new BlogBKY("mcy");//实例化的目标，被关注的对象，他的动态要通知观察者。

    Observer *observer1 = new ObserverBlog("hello",blog);//粉丝创建实例，关注观察者。

    blog->Attach(observer1);//博士挂载自己的观察者

    blog->SetStatus("发表博客！");//博主动态改变

    blog->Notify();//博主通知观察者

    system("pause");

    //delete blog;

    //delete observer1;

    return ;