#include <iostream>

#include <boost/thread.hpp>
#include <boost/shared_ptr.hpp>

int f()
{
  return 42;
}

boost::packaged_task<int>* schedule(boost::function<int ()> const& fn)
{
  // Normally, the pointer to the packaged task is stored in a queue
  // for execution on a separate thread, and the schedule function
  // would return just a future<T>

  boost::function<int ()> copy(fn);
  boost::packaged_task<int>* result = new boost::packaged_task<int>(copy);
  return result;
}

int main()
{
  boost::packaged_task<int>* p(schedule(f));
  (*p)();
  
  boost::unique_future<int> future = p->get_future();
  std::cout << "The answer to the ultimate question: " << future.get() << std::endl;

  return 0;
}