#include <iostream>
#include <vector>
#include <sstream>
#include <algorithm>
#include <list>
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()
    {
        for(auto it=m_observers.begin();it!=m_observers.end();++it)
        {
            (*it)->Update();
        }
    }
    virtual void SetStatus(string s)
    {
        m_status=s;
    }

    virtual string GetStatus()
    {
        return m_status;
    }

private:
    list<Observer*>m_observers;
protected:
    string m_status;
};

class BlogCSDN:public Blog
{
private:
    string m_name;
public:
    BlogCSDN(string name):m_name(name){}
    ~BlogCSDN(){}

    void SetStatus(string s)
    {
        m_status="CSDN通知："+m_name+s;
    }

    string GetString()
    {
        return m_status;
    }
};

class ObserverBlog:public Observer
{
private:
    string m_name;
    Blog *m_blog;

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

    ~ObserverBlog(){}
    void Update()
    {
        string status=m_blog->GetStatus();
        cout<<m_name<<"---------"<<status<<endl;
    }
};

int main()
{
    Blog *blog=new BlogCSDN("darmao");
    Observer *observer1=new ObserverBlog("tutupig",blog);
    blog->Attach(observer1);
    blog->SetStatus("發表了設計模式");
    blog->Notify();
    delete blog;
    delete observer1;
    return 0;
}