text: #pragma once
  
  #include "Shop.h"
  #include <iostream>
  #include <string>
  // to store multiple observer etc: football store 11-22 players
  #include <vector>
  
  using namespace std;
  
  class ASubject
  {
  	vector<Shop*> observerList;
  	
  	public: 
  		void Attach(Shop* shop);
  		void Detach(Shop* shop);
  		void Notify(float price);
  };
  