SmartPointer() : ptr(nullptr), counter(nullptr) {}
    SmartPointer(T* ptr) : ptr(ptr), counter(new ReferenceCounter(1)) {}
    SmartPointer(const SmartPointer<T>& other) : ptr(other.ptr), counter(other.counter)
    {
        if (counter)
            counter->AddRef();
    }
    ~SmartPointer()
    {
        if (counter)
        {
            counter->DelRef();
            if (counter->Count() == 0)
            {
                delete counter;
                delete ptr;
            }
        }
    }