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- // Copyright (C) 2014 Vicente Botet
- //
- // Distributed under the Boost Software License, Version 1.0. (See accompanying
- // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- #define BOOST_THREAD_VERSION 4
- #include <boost/config.hpp>
- #if ! defined BOOST_NO_CXX11_DECLTYPE
- #define BOOST_RESULT_OF_USE_DECLTYPE
- #endif
- #define BOOST_THREAD_PROVIDES_EXECUTORS
- #include <boost/thread/future.hpp>
- #include <boost/static_assert.hpp>
- #include <cassert>
- #include <boost/thread/executors/basic_thread_pool.hpp>
- struct TestCallback
- {
- typedef boost::future<void> result_type;
- result_type operator()(boost::future<void> future) const
- {
- assert(future.is_ready());
- future.get();
- return boost::make_ready_future();
- }
- result_type operator()(boost::future<boost::future<void> > future) const
- {
- assert(future.is_ready());
- future.get();
- return boost::make_ready_future();
- }
- };
- int main()
- {
- #if ! defined BOOST_NO_CXX11_DECLTYPE && ! defined BOOST_NO_CXX11_AUTO_DECLARATIONS
- {
- boost::promise<void> test_promise;
- boost::future<void> test_future(test_promise.get_future());
- auto f1 = test_future.then(TestCallback());
- BOOST_STATIC_ASSERT(std::is_same<decltype(f1), boost::future<boost::future<void> > >::value);
- auto f2 = f1.then(TestCallback());
- BOOST_STATIC_ASSERT(std::is_same<decltype(f2), boost::future<boost::future<void> > >::value);
- }
- {
- boost::basic_thread_pool executor;
- boost::promise<void> test_promise;
- boost::future<void> test_future(test_promise.get_future());
- auto f1 = test_future.then(executor, TestCallback());
- BOOST_STATIC_ASSERT(std::is_same<decltype(f1), boost::future<boost::future<void> > >::value);
- auto f2 = f1.then(executor, TestCallback());
- BOOST_STATIC_ASSERT(std::is_same<decltype(f2), boost::future<boost::future<void> > >::value);
- }
- #endif
- return 0;
- }
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