/*
*  Author: Ma Yaowen
*  version:1.0.0
*/
#include "Listing.h"
//This returns the Advertisement pointer whose number equals the parameter number. 
Advertisement* Listing:: operator[](const int& number){
  
	 Advertisement *p;

	 for(int i=0;i<objects.size();i++){
	     p=objects[i];
		 if(p->getNumber()==number){
		  return p;
		 }
	 }

	 return NULL;
}

//Adds the Advertisement pointer given by the parameter to the vector objects. 
void Listing::add(Advertisement* ptr){
  
	objects.push_back(ptr);
}
//This returns an iterator to the first Advertisement* in vector objects.
Listing::iterator Listing::begin(){
   
	return objects.begin();
}
//This returns an iterator to the last Advertisement* in vector objects.
Listing::iterator Listing::end(){

    return objects.end();
}