| 1 | // Copyright (C) 2015 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 | #define BOOST_THREAD_PROVIDES_EXECUTORS |
| 8 | |
| 9 | #include <boost/thread.hpp> |
| 10 | #include <boost/thread/thread_pool.hpp> |
| 11 | #include <cassert> |
| 12 | |
| 13 | auto createFuture() |
| 14 | { |
| 15 | boost::promise<void> promise; |
| 16 | promise.set_value(); |
| 17 | return promise.get_future(); |
| 18 | } |
| 19 | |
| 20 | auto stepOne(boost::basic_thread_pool &executor) |
| 21 | { |
| 22 | auto sendFuture = createFuture(); |
| 23 | auto wrappedFuture = sendFuture.then(ex&: executor, func: [](auto f) mutable { |
| 24 | return createFuture(); |
| 25 | }); |
| 26 | |
| 27 | return wrappedFuture.unwrap(); |
| 28 | } |
| 29 | |
| 30 | auto stepTwo(boost::basic_thread_pool &executor) |
| 31 | { |
| 32 | auto future = stepOne(executor); |
| 33 | return future.then(ex&: executor, func: [](auto f) { |
| 34 | assert(f.is_ready()); |
| 35 | }); |
| 36 | } |
| 37 | |
| 38 | int main() |
| 39 | { |
| 40 | boost::basic_thread_pool executor{1}; |
| 41 | stepTwo(executor).get(); |
| 42 | } |
| 43 |