class X {
private:
  int* data;

public:
  X() : data(new int[1000000]) {}
  ~X() { delete[] data; }
  X(const X& other) : data(new int[1000000])
  {
    std::copy(other.data, other.data + 1000000, data);
  }
  X(X&& other) : data(other.data) { other.data = nullptr; }
};