.c

class numbers {
private:
    std::vector<std::unique_ptr<int>> numbers;
public:
    void addNumber(int value)
    {
        std::unique_ptr<int> ptr(new int(value));
        numbers.push_back(ptr);
    }
    void printNumbers()
    {
        for (const auto& ptr : numbers) {
            std::cout << *ptr << " ";
        }
    }
};

int main()
{
    numbers n;

    n.addNumber(10);
    n.addNumber(20);
    n.printNumbers();

    return 0;
}