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