ceph/src/boost/libs/thread/test/test_9711.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_PROVIDES_FUTURE
   7 #define BOOST_THREAD_PROVIDES_FUTURE_CONTINUATION
   8 #include <boost/config.hpp>
   9 #if ! defined  BOOST_NO_CXX11_DECLTYPE
  10 #define BOOST_RESULT_OF_USE_DECLTYPE
  11 #endif
  12
  13 #include <boost/thread/future.hpp>
  14
  15
  16 int main()
  17 {
  18 #if ! defined BOOST_NO_CXX11_LAMBDAS && ! (defined BOOST_MSVC && _MSC_VER < 1700)
  19     boost::promise<int> prom;
  20     boost::future<int> futr = prom.get_future();
  21
  22     int callCount = 0;
  23
  24     boost::future<void> futr2 = futr.then(boost::launch::deferred,
  25         [&] (boost::future<int> f) {
  26             callCount++;
  27             assert(f.valid());
  28             assert(f.is_ready());
  29             assert(17 == f.get());
  30         });
  31
  32     assert(futr2.valid());
  33     assert(!futr2.is_ready());
  34     assert(0 == callCount);
  35
  36     prom.set_value(17);
  37     assert(0 == callCount);
  38
  39     futr2.get();
  40     assert(1 == callCount);
  41
  42 #endif
  43     return 0;
  44 }