Do they have a new version based on lambdas? The syntax of that is painful. I splatter my code with this:

  // WTFPL
  class Finally {
    std::function<void()> f;
  public:
    Finally(std::function<void()> f) : f{f} {}
    ~Finally() {f();}
    void disable() { f = [](){}; }
  };

Which looks much prettier:

  socket* s = open_socket(); // or whatever
  Finally cleanup_socket{[](){ close_socket(s);}};

  // optionally, to keep it alive:
  cleanup_socket.disable();

Am typing on mobile. No guarantees about syntax errors. I still need to look into where the right places to put r value references and/or std::move are, but for the most part, I never put anything other than a pointer in the closure so I'm not worried about copy constructor cost.