class Iterator {//ili friend class
    T* dataP;
public:
    Iterator(T* target) : dataP(target) {}
    bool operator != (const Iterator &other) const {
        return dataP != other.dataP;
    }
    bool operator ++(int) {
        dataP++;
    }
    bool operator * () const {

    }
    T operator* () const {
        return *dataP;
    }
};
//+proverki

class ArrayContainer {
    Iterator begin() const;
    Iterator end() const;
};

template <typename T>
typename ArrayContainer<T>::Iterator ArrayContainer<T>::begin() const {
    return Interator(array);
}

template <typename T>
typename ArrayContainer<T>::Iterator ArrayContainer<T>::end() const {

    return Iterator(!array ? nullptr :array + size);
}

for (auto it = test.begin(); it != test.end(); i++) {
    std::cout << *it;
}

ArrayContainer<int>& p = test;
auto i = p;
auto&i = p; //!