#include <iostream>
#include <memory>

using namespace std;

void decrement(unique_ptr<int> &n);
unique_ptr<int> increment(unique_ptr<int> n);

int
main()
{
  unique_ptr<int> n(new int(10));

  cout << "*n = " << *n << endl;

  decrement(n);

  cout << "*n = " << *n << endl;

  n = std::move(increment(std::move(n)));

  cout << "*n = " << *n << endl;

  return 0;
  // n will die here
}

void
decrement(unique_ptr<int> &n)
{
  --(*n);
}

unique_ptr<int>
increment(unique_ptr<int> n)
{
  ++(*n);
  return n;
}