ceph/src/boost/libs/thread/test/test_12293.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
   8 // BoostFutureTest.cpp : Defines the entry point for the console application.
   9 //
  10
  11 #include <iostream>
  12
  13 // boost version 1.60.0
  14 // has the following set.
  15 #define BOOST_THREAD_VERSION 4
  16 // #define BOOST_THREAD_PROVIDES_EXECUTORS
  17
  18 #include <boost/thread/future.hpp>
  19
  20
  21 int main()
  22 {
  23     int value = 0;
  24     int tmpValue = 0;
  25     boost::promise<void> promise1;
  26     boost::promise<void> promise2;
  27
  28     auto future1 = promise1.get_future();
  29
  30     auto waitFuture = future1.then([&tmpValue, &promise2](boost::future<void> future){
  31         assert(future.is_ready());  // this works correctly and is ready.
  32
  33         auto fut = boost::async(boost::launch::async, [&promise2, &tmpValue](){
  34           boost::this_thread::sleep_for(boost::chrono::seconds(1));
  35             tmpValue = 1;
  36             promise2.set_value();
  37             std::cout << "Step 2 "<< std::endl; // should print 1 but prints 0
  38         });
  39         std::cout << "Step 1 "<< std::endl; // should print 1 but prints 0
  40
  41         return promise2.get_future();
  42         //return ;
  43     }).then([&value, &tmpValue](boost::future<boost::future<void>> future){
  44     //}).then([&value, &tmpValue](boost::future<void> future){
  45       // error: no matching function for call to ‘boost::future<boost::future<void> >::then(main()::<lambda(boost::future<void>)>)’
  46       // as expected
  47
  48         assert(future.is_ready());  // this doesn't work correctly and is not ready.
  49
  50
  51         value = tmpValue;
  52     });
  53
  54
  55     promise1.set_value();
  56     waitFuture.wait();
  57
  58     std::cout << "value = " << value << std::endl; // should print 1 but prints 0
  59     return 0;
  60 }
  61