BagInterface.h

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//  Created by Frank M. Carrano and Timothy M. Henry.
//  Copyright (c) 2017 Pearson Education, Hoboken, New Jersey.
#ifndef BAG_INTERFACE_
#define BAG_INTERFACE_

#include <vector>

template<class ItemType>
class BagInterface
{
public:
   virtual int getCurrentSize() const = 0;
   
   virtual bool isEmpty() const = 0;
   
   virtual bool add(const ItemType& newEntry) = 0;
   
   virtual bool remove(const ItemType& anEntry) = 0;
   
   virtual void clear() = 0;
   
   virtual int getFrequencyOf(const ItemType& anEntry) const = 0;
   
   virtual bool contains(const ItemType& anEntry) const = 0;
   
   virtual std::vector<ItemType> toVector() const = 0;
   
   virtual ~BagInterface() { }
}; // end BagInterface
#endif