// Copyright (C) 2012-2013 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) #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_UNWRAP int p1() { BOOST_THREAD_LOG << "P1" << BOOST_THREAD_END_LOG; return 123; } boost::future<int> p2() { BOOST_THREAD_LOG << "<P2" << BOOST_THREAD_END_LOG; boost::future<int> f1 = boost::async(boost::launch::async, &p1); BOOST_THREAD_LOG << "P2>" << BOOST_THREAD_END_LOG; return boost::move(f1); } int main() { BOOST_THREAD_LOG << "<MAIN" << BOOST_THREAD_END_LOG; try { boost::future<boost::future<int> > outer_future = boost::async(boost::launch::async, &p2); boost::future<int> inner_future = outer_future.unwrap(); int i = inner_future.get(); BOOST_THREAD_LOG << "i= "<< i << "" << 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