// pq.h - abstract base class for a priority queue
// cmc, 11/1/2013

#ifndef PQ_H
#define PQ_H

class PQ {

public:
    // "pure virtual" priority queue interface:
    
    // put the double value in the queue
    virtual void put(double) = 0;
    
    // return the greatest double value
    // and removes this value from the queue
    virtual double get() = 0;
    
};

#endif