如何修复错误&#39;std :: promise <int> :: promise（const std :: promise <int> ＆）&#39;：尝试引用已删除的函数

Question

I am trying to understand 'future', 'promise' and 'async'. So I copied the following code nearly verbatim from cppreference.com . The compiler gives the error std::promise<int>::promise(const std::promise<int> &) : attempting to reference a deleted function.

#include "stdafx.h"
#include <iostream>
#include <future>
#include <thread>

int main()
{
  // future from a packaged_task
  std::packaged_task<int()> task([](){ return 7; }); // wrap the function
  std::future<int> f1 = task.get_future();  // get a future
  std::thread(std::move(task)).detach(); // launch on a thread

// future from an async()
  std::future<int> f2 = std::async(std::launch::async, [](){ return 8; });

// future from a promise
  std::promise<int> p;
  std::future<int> f3 = p.get_future();
  std::thread( [](std::promise<int> p){ p.set_value_at_thread_exit(9); }, //<-- error occurs here
             std::move(p) ).detach();

  std::cout << "Waiting..." << std::flush;
  f1.wait();
  f2.wait();
  f3.wait();
  std::cout << "Done!\nResults are: "
            << f1.get() << ' ' << f2.get() << ' ' << f3.get() << '\n';
}

I see why, the 'promise' p can't be copied due to the copy constructor. But since it is not my class, I can't change it. So my questions are:

1) This is an example from a C++ reference website, does it compile on any other compiler? (I am using VS 2013).

2) What can I do to fix the error and get the example to work as intended?

NOTE: I answered my own question below. But now the example program fails a debug assertion at ...

f3.wait();

So, though my change allows it to compile, now I have a runtime error. Is that due to my change? Or is it another bug? The error is "Debug Error! ... R6010 - abort() has been called".

NOTE: I modified my answer below. I decided to use a pointer instead of a reference.

Answer 1

Sorry, I just figured it out. I changed the function to pass a pointer as follows...

std::thread( [](std::promise<int>* p){ p->set_value_at_thread_exit(9); }, //<-- pointer fixes error
         &p).detach();

I had tried using a reference. That fixed the original error but then I ran into a failed debug assertion "Debug Error! ... R6010 - abort() has been called". While debugging, I found the promise destructor being called after the promise task completed but before F3.wait() was called.

So, that answers question #2. I assume the answer to question #1 is 'no'. I will let the sight know about the bug (will edit it if I can).