template<class T>
struct AutoPtr
{
    typedef T subtype;
    T* item;

    AutoPtr() : item(nullptr) { }
    AutoPtr(T* v) : item(v) { if (item) item->retain(); }
    AutoPtr(const AutoPtr& other): item(other.item) { if (item) item->retain(); }
    ~AutoPtr() { if (item) { item->release(); item = nullptr; } }
    AutoPtr& operator = (const AutoPtr& other) { if (item) item->release(); item = other.item; if (item) item->retain(); return *this; }

    AutoPtr(AutoPtr&& other): item(other.item) { other.item = nullptr; }
    AutoPtr& operator = (AutoPtr&& other) { if (this != &other) { if (item) item->release(); item = other.item; other.item = nullptr; } return *this; }

    T* operator -> () const { return item; }
    T& operator * () const { return *item; }
    operator T* () const { return item; }
};