1  #include <iostream>
 2  #include <future>
 3  #include <thread>
 4  #include "unity.h"
 5   
 6  #if __GTHREADS && __GTHREADS_CXX0X
 7  TEST_CASE("C++ future", "[std::future]")
 8  {
 9      // future from a packaged_task
10      std::packaged_task<int()> task([]{ return 7; }); // wrap the function
11      std::future<int> f1 = task.get_future();  // get a future
12      std::thread t(std::move(task)); // launch on a thread
13   
14      // future from an async()
15      std::future<int> f2 = std::async(std::launch::async, []{ return 8; });
16   
17      // future from a promise
18      std::promise<int> p;
19      std::future<int> f3 = p.get_future();
20      std::thread( [&p]{ p.set_value_at_thread_exit(9); }).detach();
21   
22      std::cout << "Waiting..." << std::flush;
23      f1.wait();
24      f2.wait();
25      f3.wait();
26      std::cout << "Done!\nResults are: "
27                << f1.get() << ' ' << f2.get() << ' ' << f3.get() << '\n';
28      t.join();
29  }
30  #endif
31