out_of_scope_futures.cpp

#include <iostream>
#include <thread>
#include <future>
#include <boost/asio.hpp>

using namespace std;
namespace asio = boost::asio;


int main() {
  asio::io_service ios;
  auto work = make_shared<asio::io_service::work>(ios);

  thread t([&]() { ios.run(); });

  for (int i = 0; i < 1000; ++i)
  {
    promise<bool> setter;
    future<bool>  getter = setter.get_future();

    ios.post([&]() { setter.set_value(true); });

    getter.wait();
  }

  work.reset();
  t.join();

  cout << "done\n";
}