The function clears its own values [duplicate]

Question

Can someone explain to me why, in the Push_Back function, the values of a structure are erased?

class Lista2
{
public:
    typedef struct Element
    {
        Element(int newValue)
        {
            value = newValue;
            next = nullptr;
        }

        Element* next;
        int value;
        Element* prev;
    };
    Element* first;

    void init() {
        Element ok(0);
        first = &ok;
    }

    void Push_Back(int value)
    {
        Element* temp = first;
        Element* temp2;
        temp2 = new Element(value);
        if (temp != nullptr)
        {
            while (temp->next != nullptr)
            {
                temp = temp->next;
            }
            temp->next = temp2;
        }
        else first = temp2;
    }

I called the function: init() and after Push_Back(). In Push_back I see this in debuger:

Can someone explain to me why, in the Push_Back function, the values of a structure are erased?

Answer 1

In init, you created variable on stack, took it address and saved it as the structure member.