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