Sleds/cppboost/libs/thread/example/lambda_future.cpp

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// Copyright (C) 2013 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)
#include <boost/config.hpp>
#if ! defined BOOST_NO_CXX11_DECLTYPE
#define BOOST_RESULT_OF_USE_DECLTYPE
#endif
#define BOOST_THREAD_VERSION 4
#define BOOST_THREAD_USES_LOG
#define BOOST_THREAD_USES_LOG_THREAD_ID
#include <boost/thread/detail/log.hpp>
#include <boost/thread/future.hpp>
#include <boost/assert.hpp>
#include <string>
#if defined BOOST_THREAD_PROVIDES_FUTURE_CONTINUATION \
&& ! defined BOOST_NO_CXX11_LAMBDAS
int main()
{
BOOST_THREAD_LOG << "<MAIN" << BOOST_THREAD_END_LOG;
try
{
{
boost::future<int> f1 = boost::async(boost::launch::async, []() {return 123;});
int result = f1.get();
BOOST_THREAD_LOG << "f1 " << result << BOOST_THREAD_END_LOG;
}
{
boost::future<int> f1 = boost::async(boost::launch::async, []() {return 123;});
boost::future<int> f2 = f1.then([](boost::future<int> f) {return 2*f.get(); });
int result = f2.get();
BOOST_THREAD_LOG << "f2 " << result << BOOST_THREAD_END_LOG;
}
}
catch (std::exception& ex)
{
BOOST_THREAD_LOG << "ERRORRRRR "<<ex.what() << "" << BOOST_THREAD_END_LOG;
return 1;
}
catch (...)
{
BOOST_THREAD_LOG << " ERRORRRRR exception thrown" << BOOST_THREAD_END_LOG;
return 2;
}
BOOST_THREAD_LOG << "MAIN>" << BOOST_THREAD_END_LOG;
return 0;
}
#else
int main()
{
return 0;
}
#endif