#pragma once

#include <memory>

class ArrayT {
    public:
       ArrayT();
       ArrayT(const ArrayT & other);

       ArrayT & operator =(const ArrayT & other);

       void PushBack(int);
       void PopBack();
       int Back() const;

       int & At(size_t i);
       const int & At(size_t i) const;

       int & operator[](size_t i);
       const int & operator[](size_t i) const;

       size_t Size() const;

    private:
       size_t size;
       std::unique_ptr<int[]> data;
};