#ifndef _publisher_h
#define _publisher_h

#include <vector>
using namespace std;

class Subscriber
{

public:
	virtual void notify() {};

};

class Publisher
{

private:
	vector< Subscriber* > subscribers;

public:
	void attach( Subscriber* sub )
	{
		vector< Subscriber* >::iterator i;
		for( i = subscribers.begin(); i != subscribers.end(); ++i )
		{
			if( *i == sub )
			{
				return;
			}
		}
		subscriber.push_back( sub );
	};

	void detach( Subscriber* sub )
	{
		vector< Subscriber* >::iterator i;
		for( i = subscribers.begin(); i != subscribers.end(); ++i )
		{
			if( *i == sub )
			{
				subscribers.erase( i );
				return;
			}
		}
	};

	void updateAll()
	{
		vector< Subscriber* >::iterator i;
		for( i = subscribers.begin(); i != subscribers.end(); ++i )
		{
			(*i) -> notify();
		}
	};
};

#endif