// PriorityQueue.h - wdg 2008
#ifndef PRIORITY_QUEUE_H
#define PRIORITY_QUEUE_H

typedef double ItemType; 
const ItemType ERROR=-1;

class PriorityQueue 
{
 public:
  virtual void insertItem(ItemType)=0;
  virtual ItemType removeMin()=0;
  virtual bool isEmpty() const =0;
  virtual int getCount() const =0;
};

#endif