| 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 | #define BOOST_THREAD_PROVIDES_EXECUTORS |
| 12 | |
| 13 | #include <boost/thread/future.hpp> |
| 14 | #include <boost/static_assert.hpp> |
| 15 | #include <cassert> |
| 16 | #include <boost/thread/executors/basic_thread_pool.hpp> |
| 17 | |
| 18 | |
| 19 | struct TestCallback |
| 20 | { |
| 21 | typedef boost::future<void> result_type; |
| 22 | |
| 23 | result_type operator()(boost::future<void> future) const |
| 24 | { |
| 25 | assert(future.is_ready()); |
| 26 | future.get(); |
| 27 | return boost::make_ready_future(); |
| 28 | } |
| 29 | |
| 30 | result_type operator()(boost::future<boost::future<void> > future) const |
| 31 | { |
| 32 | assert(future.is_ready()); |
| 33 | future.get(); |
| 34 | return boost::make_ready_future(); |
| 35 | } |
| 36 | }; |
| 37 | |
| 38 | int main() |
| 39 | { |
| 40 | #if ! defined BOOST_NO_CXX11_DECLTYPE && ! defined BOOST_NO_CXX11_AUTO_DECLARATIONS |
| 41 | { |
| 42 | boost::promise<void> test_promise; |
| 43 | boost::future<void> test_future(test_promise.get_future()); |
| 44 | auto f1 = test_future.then(func: TestCallback()); |
| 45 | BOOST_STATIC_ASSERT(std::is_same<decltype(f1), boost::future<boost::future<void> > >::value); |
| 46 | auto f2 = f1.then(func: TestCallback()); |
| 47 | BOOST_STATIC_ASSERT(std::is_same<decltype(f2), boost::future<boost::future<void> > >::value); |
| 48 | } |
| 49 | { |
| 50 | boost::basic_thread_pool executor; |
| 51 | boost::promise<void> test_promise; |
| 52 | boost::future<void> test_future(test_promise.get_future()); |
| 53 | auto f1 = test_future.then(ex&: executor, func: TestCallback()); |
| 54 | BOOST_STATIC_ASSERT(std::is_same<decltype(f1), boost::future<boost::future<void> > >::value); |
| 55 | auto f2 = f1.then(ex&: executor, func: TestCallback()); |
| 56 | BOOST_STATIC_ASSERT(std::is_same<decltype(f2), boost::future<boost::future<void> > >::value); |
| 57 | |
| 58 | } |
| 59 | #endif |
| 60 | return 0; |
| 61 | } |
| 62 |