Лаба для Ольги(третья)

#include <iostream>

using namespace std;
class TPointer
{
private:
    int data;
    TPointer* next;
    TPointer* prev;
public:
    TPointer()
    {
        data = 0;
        next = NULL;
        prev = NULL;
    }

    TPointer(int adData)
    {
        data = adData;
        next = NULL;
        prev = NULL;
    }

    int isEmpty()
    {
        return (next==NULL)&&(prev==NULL)&&(data==0);
    }

    void addElem(int adData)
    {
        TPointer* t;
        if(isEmpty())
            data = adData;
        else
        {
            t = this;
            while(t->next!=NULL)
                t = t->next;
            t->next = new TPointer;
            t->next->data = adData;
            t->next->next = NULL;
            t->next->prev = t;
        }
    }

    void printList()
    {
        TPointer* t = this;
        while(t!=NULL)
        {
            cout<<t->data<<" ";
            t = t->next;
        }
        cout<<endl;
    }


    ~TPointer()
    {
        TPointer* p;
        TPointer* t;
        t = this;
        while(t)
        {
            p = t->next;
            delete t;
            t = p;
        }
    }

};

int main()
{
    setlocale(0, "RUSSIAN");
    TPointer* Pointer = new TPointer;
    if(Pointer->isEmpty())
        cout<<"Список пуст!"<<endl;
    else
        cout<<"Список не пуст"<<endl;
    int buff;
    cout<<"Введите числа. конец ввода - 0"<<endl;
    cin>>buff;
    while(buff!=0)
    {
        Pointer->addElem(buff);
        cin>>buff;
    }

    Pointer->printList();
    if(Pointer->isEmpty())
        cout<<"Список пуст!"<<endl;
    else
        cout<<"Список не пуст"<<endl;
    return 0;
}