// File: stringcell.C
//
// Implementation of the StringCell class

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


//========================================================================
// "Local" functions
//

static void CrashOnNULL(void *, char *) ;

static void CrashOnNULL(void *ptr, char *mesg) {
   if (ptr == NULL) {
      cerr << "CrashOnNULL: " << mesg <<endl ;
      exit(1) ;
   }
}


//========================================================================
// Definition of StringCell member functions
//

int StringCell::idvar=0 ;

// Constructors
//
StringCell::StringCell() {
#ifndef NDEBUG
   cerr << "StringCell: default constructor, this=" << this << endl ;
#endif

}

StringCell::StringCell(BString& bs)
:  data(bs) {

#ifndef NDEBUG
   cerr << "StringCell: alternate constructor, this=" << this << endl ;
#endif

}

StringCell::StringCell(char *str)
:  data(str) {

#ifndef NDEBUG
   cerr << "StringCell: alternate constructor, this=" << this << endl ;
#endif

}


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

}


// make a copy of this StringCell and return a pointer to the copy
//
ListCell *StringCell::clone() const {
    StringCell *sptr = new StringCell(*this) ;
    CrashOnNULL(sptr, "out of memory in StringCell::clone()") ;
    return sptr ;
}


// Compare a ListCell with a StringCell
//
int StringCell::cmp(const ListCell& cell) const {

#ifndef NDEBUG
   cerr << "StringCell: compare function" << endl ;
#endif

   if (cell.id() != &StringCell::idvar) { // if not a StringCell
      return cell.id() < &StringCell::idvar ? 1 : -1 ;
   }

   StringCell *sptr = (StringCell *) & cell ;
   if (data < sptr->data) return -1 ;
   if (data == sptr->data) return 0 ;
   return 1 ;
}


// print a string, virtually
//
void StringCell::print() const {
#ifndef NDEBUG
   cerr << "StringCell: print function" << endl ;
#endif

   cout << data << " " ;
}


// Return &idvar for id purposes
//
int *StringCell::id() const {
#ifndef NDEBUG
   cerr << "StringCell: id function" << endl ;
#endif

   return &StringCell::idvar ;
}