Связный список объектов

#include <iostream>
#include "Staff.h"
 
using namespace std;
 
Staff * Staff :: begin = 0;
Staff * Staff :: end = 0;
 
Staff :: Staff() {
    name = 0;
    surname = 0;
    experience = 0;
    next = 0;
}
 
Staff :: Staff(char *name, char *surname, int experience) {
    this -> name = new char[strlen(name) + 1];
    strcpy(this -> name, name);
    this -> surname = new char[strlen(surname) + 1];
    strcpy(this -> surname, surname);
    this -> experience = experience > 0 ? experience : 0;
    next = 0;
}
 
Staff :: ~Staff() {
    delete [] name;
    delete [] surname;
 
    if (!isEmpty()) {
        Staff *currentPtr = begin, *tempPtr;
        while (currentPtr != 0) {
            tempPtr = currentPtr;
            currentPtr = currentPtr -> next;
            delete tempPtr;     
        }
    }       
}
 
int Staff :: isEmpty() {
    return begin == 0;
}
 
void Staff :: printElements() {
    if (isEmpty()) {
        cout << "List is empty\n";
        return;
    }
 
    Staff *tempPtr = begin;
    while (tempPtr != 0) {
        tempPtr -> printData();
        tempPtr = tempPtr -> next;
    }
}
 
void Staff :: addElement() {
    if (isEmpty())
        begin = end = this;
    else {
        this -> next = begin;
        begin = this;
    }
}
 
int Staff :: deleteElement() {
    if (isEmpty())
        return 0;
    else {
        Staff *tempPtr = begin;
        if (begin == end)
            begin = end = 0;
        else 
            begin = begin -> next;
        delete tempPtr;
        return 1;
    }
}

while (tempPtr) { // != 0 лучше заменить на != NULL, либо вот так, может поможет
        tempPtr -> printData();
        tempPtr = tempPtr -> next;
    }

Engineer obj1("Kino", "Kino", 20, 10.2, 3);
obj1.addElement();
obj1.deleteElement();

int Staff :: deleteElement() {
    if (isEmpty())
        return 0;
    else {
        Staff *tempPtr = begin;
        if (begin == end)
            begin = end = 0;
        else 
            begin = begin -> next;
        delete tempPtr;
        return 1;
    }
}

Staff :: ~Staff() {
    delete [] name;
    delete [] surname;
 
    if (!isEmpty()) {
        Staff *currentPtr = begin, *tempPtr;
        while (currentPtr != 0) {
            tempPtr = currentPtr;
            currentPtr = currentPtr -> next;
            delete tempPtr;     
        }
    }       
}

#include <iostream>
#include "Engineer.h"
#include "Staff.h"
#include "Worker.h"
 
using namespace std;
int main() {
        Engineer obj1("Lev", "Lev", 20, 10.2, 3);
    Worker obj2("Sobaka", "Sobaka", 10, 9.9, 4);
    Engineer obj3("Kot", "Kot", 20, 9.9, 2);
    Worker obj4("Ptica", "Ptica", 15, 2.3, 1);
 
    obj1.addElement();
    obj2.addElement();
    obj3.addElement();
    obj4.addElement();
 
    Staff :: printElements();
 
    obj1.deleteElement();
    
    cout << "asdasd" << endl;   
        return 0;
}

#include "Engineer.h"
#include "Staff.h"
#include "Worker.h"