void pushback (T x)
        {
            size += 1;
            if (size >= capacity) {
                reallocate(capacity*2);
                capacity = capacity*2;
            }
            data[size++] = x;
        }
        void reallocate(size_t s)
        {
            if (s < capacity)
                {
                    std::cout << "what are you doing mazafuka" << std::endl;
                    return;
                }
            T* data_new = new T[s];
            for(int it = 0; it != size ; ++it)
                    {
                        data_new[it] = data[it];

                    }
            data = data_new;
            delete[] data;
        }