| 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(policy: boost::launch::deferred, |
| 25 | func: [&] (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 | } |
| 45 |