template <typename T>
class MyArray {
private:
    T *array;
    std::size_t size;
    unsigned index;
public:
    explicit MyArray(std::size_t);
    MyArray(const MyArray&);
    ~MyArray();
    void pushBack(T);
    T& operator[](std::size_t);
}

template<typename T>
MyArray<T>::MyArray(const MyArray& arr) {
    index = arr.index;
    size = arr.size;
    for(unsigned int i = 0; i < size; i++) {
        array[i] = arr.array[i];
    }
}

template class MyArray<int>;
template class MyArray<std::string>;
template class MyArray<double>;

template<typename T>
MyArray<T>::MyArray(std::size_t s) : size(s) {
    array = new T[size];
    index = 0;
}

MyArray<int> intArray(5);
for (unsigned i = 0; i < 5; i++) intArray.pushBack(2);
    std::cout << intArray[2] << std::endl;