// File: HQueue.cpp
//
// A heterogeneous FIFO queue, derived from HList.h
//

#include "HQueue.h"

// Constructors

HQueue::HQueue () {
   // everything done in HList constructor
} 

HQueue::HQueue (const HQueue& Q) : HList(Q) {
   // no other code
}

// Destructor
HQueue::~HQueue() {
   // everything done in HList destructor
}

// Assignment
const HQueue& HQueue::operator=(const HQueue& rhs) {
    HList::operator=(rhs) ;
    return *this ;
}

// FIFO queue operations
void HQueue::enqueue(HNode *ptr) { 
   push_back(ptr) ; 
}

void HQueue::dequeue() { 
   pop_front() ; 
}

ostream& operator<< (ostream& os, const HQueue& Q) {
   Q.print(os) ; 
   return os ;
}