65 lines
1.6 KiB
C++
65 lines
1.6 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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#include <boost/thread/future.hpp>
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#include <boost/thread/thread.hpp>
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#include <thread>
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int main()
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{
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{
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boost::promise<int> promise;
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boost::future<int> future = promise.get_future();
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boost::future<int> result =
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future.then
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(
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boost::launch::deferred,
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[](boost::future<int> && f)
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{
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std::cout << std::this_thread::get_id() << ": callback" << std::endl;
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std::cout << "The value is: " << f.get() << std::endl;
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return f.get();
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}
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);
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// We could not reach here.
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std::cout << std::this_thread::get_id() << ": function" << std::endl;
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promise.set_value(0);
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}
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{
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boost::promise<int> promise;
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boost::shared_future<int> future = promise.get_future().share();
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boost::future<int> result =
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future.then
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(
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boost::launch::deferred,
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[](boost::shared_future<int> && f)
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{
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std::cout << std::this_thread::get_id() << ": callback" << std::endl;
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std::cout << "The value is: " << f.get() << std::endl;
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return f.get();
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}
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);
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// We could not reach here.
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std::cout << std::this_thread::get_id() << ": function" << std::endl;
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promise.set_value(0);
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}
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return 0;
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}
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