Getting return value from a boost::threaded member function?

Question

I have a worker class like the one below:

class Worker{
public:
  int Do(){
    int ret = 100;
    // do stuff
    return ret;
  }
}

It\'s

Answer 1

class Worker{
public:
  int Do(){
  int ret = 100;
  // do stuff
  return ret;
  }
}

Worker worker;
boost::packaged_task ptask(boost::bind(&Worker::Do, &worker));
boost::unique_future future_int = ptask.get_future();
boost::thread th(boost::move(ptask));
th.join();
if (future_int.is_ready())
   int return_value = future_int.get();

You can take a look at the "boost::future" concept, ref this link