#include <iostream>
#include <list>
using namespace std;

//--------Observer----------------
class ITeacherListenner
{
public:
	virtual void onTecherComming(int value) = 0;
};

class ZhangSan:public ITeacherListenner
{
public:
	void onTecherComming(int value)
	{
		stopCopyWork(value);
	}
	
	void stopCopyWork(int value)
	{
		cout<<"zhangsan stopCopyWork + "<<value<<endl;
	}
};

class LiSi:public ITeacherListenner
{
public:
	void onTecherComming(int value)
	{
		stopPlayGame(value);
	}
	void stopPlayGame(int value)
	{
		cout<<"lisi stopPlayGame + "<<value<<endl;
	}
};
//--------Subject-------------------

class INotifier
{
public:
	virtual void registerListenner(ITeacherListenner *l) =0 ;
	virtual void removeListenner(ITeacherListenner *l) =0 ; 
	virtual void notify() =0 ;	
};

class MonitorNotifier:public INotifier
{
public:
	void registerListenner(ITeacherListenner *l)
	{
		listenners.push_back(l);
	}
	void removeListenner(ITeacherListenner *l)
	{
		list<ITeacherListenner*>::iterator it;
		for(it=listenners.begin();it!=listenners.end();it++)
		{
			if(*it == l)
			{
				listenners.remove(l);
				break;
			}
		}
		
	}
	void notify()
	{
		list<ITeacherListenner*>::iterator it;
		for(it=listenners.begin();it!=listenners.end();it++)
		{
			(*it)->onTecherComming(mValue);
		}
	
	}
	void setValue(int value)
	{
		mValue = value;
		notify();
	}
private:
	list<ITeacherListenner*> listenners;
	int mValue;
};

//-----------main-----------------

int main()
{
   cout << "Hello World1-------------"<<endl;
   MonitorNotifier monitor;
   ZhangSan zs;
   LiSi ls;
   monitor.registerListenner(&zs);
   monitor.registerListenner(&ls);
   monitor.setValue(1);
	
   cout << "Hello World2-------------"<<endl;
   monitor.removeListenner(&ls);
   monitor.setValue(2);
	
   return 0;
}