| 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 | policy: boost::launch::deferred, |
| 27 | func: [](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 | policy: boost::launch::deferred, |
| 49 | func: [](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 | } |
| 65 |