#pragma once

using ItemType=int;
const ItemType NO_ITEM{0};

class ArrayT {
    public:
        ArrayT();
        ItemType & operator[] (size_t index);
        void PushBack(ItemType item);
        void PopBack();
        size_t Size() const;
        size_t Capacity() const;

    private:
        ItemType * data;
        size_t size;
        size_t capacity;
};