// File: genstack.C
//
// Implementation of GenStack class, which is derived from GenQ

#include <iostream.h>
#include <iomanip.h>
#include <stdlib.h>
#include "genstack.h"


// Constructor.  No default constructor!
//
GenStack::GenStack(GenQ::GQcmp cmp_func, GenQ::GQprt prt_func)
: GenQ(cmp_func, prt_func)  // member initializer
{
#ifndef NDEBUG
   cerr << "GenStack constructor, this = " << this << endl ;
#endif

   // Do nothing
}


// Destructor
//
GenStack::~GenStack() {
#ifndef NDEBUG
   cerr << "GenStack destructor, this = " << this << endl ;
#endif

   // Do nothing, GenQ destructor automatically called
}


// Add item to the top of the stack
//
void GenStack::push(void *ptr) {

   QCell *q = newcell() ;
   q->data = ptr ;
   q->next = dummy.next ;
   dummy.next = q ;
   len++ ;

   if (q->next == NULL) last = q ;
}