#include <iostream>

template <class A>
class Array
{
public:
    Array() : size_(0), data_("") {}
    Array(size_t size) : size_(size), data_(new A[size]) {}
    ~Array() { delete[] data_; };
    size_t size() const { return size_; }
    A& operator[] (size_t i) const
    {
        if (i >= size_)
            throw std::out_of_range("index out of border");
        return data_[i];
    }
private:
    size_t size_;
    A* data_;
};