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
21int main()
22{
23#if __cplusplus >= 201103L
24
25 int value = 0;
26 int tmpValue = 0;
27 boost::promise<void> promise1;
28 boost::promise<void> promise2;
29
30 auto future1 = promise1.get_future();
31
32 auto waitFuture = future1.then(func: [&tmpValue, &promise2](boost::future<void> future){
33 assert(future.is_ready()); // this works correctly and is ready.
34
35 auto fut = boost::async(policy: boost::launch::async, f: [&promise2, &tmpValue](){
36 boost::this_thread::sleep_for(d: boost::chrono::seconds(1));
37 tmpValue = 1;
38 promise2.set_value();
39 std::cout << "Step 2 "<< std::endl; // should print 1 but prints 0
40 });
41 std::cout << "Step 1 "<< std::endl; // should print 1 but prints 0
42
43 return promise2.get_future();
44 //return ;
45 }).then(func: [&value, &tmpValue](boost::future<boost::future<void>> future){
46 //}).then([&value, &tmpValue](boost::future<void> future){
47 // error: no matching function for call to ‘boost::future<boost::future<void> >::then(main()::<lambda(boost::future<void>)>)’
48 // as expected
49
50 assert(future.is_ready()); // this doesn't work correctly and is not ready.
51
52
53 value = tmpValue;
54 });
55
56
57 promise1.set_value();
58 waitFuture.wait();
59
60 std::cout << "value = " << value << std::endl; // should print 1 but prints 0
61#endif
62 return 0;
63}
64
65

source code of boost/libs/thread/test/test_12293.cpp