#include <iostream>
using namespace std;

class Foo {
  int x;

public:
  Foo(int _x) { x = _x; };
  Foo &operator++();
  int get() { return x; }
};

Foo &Foo::operator++() {
  x++;
  return *this;
}

int main() {
  Foo bar = Foo(-3);
  ++bar;
  cout << bar.get();
}