如何将 boost::bind 与不可复制的参数一起使用，例如 boost::promise？

某些 C++ 对象没有复制构造函数，但有移动构造函数。 例如，boost::promise。 如何使用它们的移动构造函数绑定这些对象？

#include <boost/thread.hpp>

void fullfil_1(boost::promise<int>& prom, int x)
{
  prom.set_value(x);
}

boost::function<void()> get_functor() 
{
  // boost::promise is not copyable, but movable
  boost::promise<int> pi;

  // compilation error
  boost::function<void()> f_set_one = boost::bind(&fullfil_1, pi, 1);

  // compilation error as well
  boost::function<void()> f_set_one = boost::bind(&fullfil_1, std::move(pi), 1);

  // PS. I know, it is possible to bind a pointer to the object instead of 
  // the object  itself. But it is weird solution, in this case I will have
  // to take cake about lifetime of the object instead of delegating that to
  // boost::bind (by moving object into boost::function object)
  //
  // weird: pi will be destroyed on leaving the scope
  boost::function<void()> f_set_one = boost::bind(&fullfil_1, boost::ref(pi), 1);
  return f_set_one;
}

我不确定如何使用移动构造函数，但另一种方法是使用 boost::ref 创建对对象的可复制引用，然后您可以将它们传递给 boost::bind。