ceph/src/boost/libs/thread/test/test_11818.cpp

   1 // Copyright (C) 2014 Vicente Botet
   2 //
   3 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #define BOOST_THREAD_VERSION 4
   7 #include <boost/config.hpp>
   8 #if ! defined  BOOST_NO_CXX11_DECLTYPE
   9 #define BOOST_RESULT_OF_USE_DECLTYPE
  10 #endif
  11
  12 #include <boost/thread/future.hpp>
  13 #include <boost/thread/thread.hpp>
  14 #include <thread>
  15
  16 int main()
  17 {
  18
  19   {
  20     boost::promise<int> promise;
  21     boost::future<int> future = promise.get_future();
  22
  23     boost::future<int> result =
  24     future.then
  25     (
  26         boost::launch::deferred,
  27         [](boost::future<int> && f)
  28         {
  29             std::cout << std::this_thread::get_id() << ": callback" << std::endl;
  30             std::cout << "The value is: " << f.get() << std::endl;
  31             return f.get();
  32         }
  33     );
  34
  35     // We could not reach here.
  36     std::cout << std::this_thread::get_id() << ": function" << std::endl;
  37
  38     promise.set_value(0);
  39   }
  40
  41   {
  42     boost::promise<int> promise;
  43     boost::shared_future<int> future = promise.get_future().share();
  44
  45     boost::future<int> result =
  46     future.then
  47     (
  48         boost::launch::deferred,
  49         [](boost::shared_future<int> && f)
  50         {
  51             std::cout << std::this_thread::get_id() << ": callback" << std::endl;
  52             std::cout << "The value is: " << f.get() << std::endl;
  53             return f.get();
  54         }
  55     );
  56
  57     // We could not reach here.
  58     std::cout << std::this_thread::get_id() << ": function" << std::endl;
  59
  60     promise.set_value(0);
  61   }
  62
  63   return 0;
  64 }