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future_unwrap.cpp
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92 lines (82 loc) · 2.45 KB
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// 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)
#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>
#include <iostream>
#if defined BOOST_THREAD_PROVIDES_FUTURE_UNWRAP
#ifdef BOOST_MSVC
#pragma warning(disable: 4127) // conditional expression is constant
#endif
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()
{
const int number_of_tests = 100;
BOOST_THREAD_LOG << "<MAIN" << BOOST_THREAD_END_LOG;
for (int i=0; i< number_of_tests; i++)
try
{
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
{
boost::future<int> inner_future = boost::async(boost::launch::async, &p2).unwrap();
inner_future.wait();
int ii = inner_future.get();
BOOST_THREAD_LOG << "ii= "<< ii << "" << BOOST_THREAD_END_LOG;
}
#endif
{
boost::future<boost::future<int> > outer_future = boost::async(boost::launch::async, &p2);
boost::future<int> inner_future = outer_future.unwrap();
inner_future.wait();
int ii = inner_future.get();
BOOST_THREAD_LOG << "ii= "<< ii << "" << BOOST_THREAD_END_LOG;
}
{
boost::future<boost::future<int> > outer_future = boost::async(boost::launch::async, &p2);
boost::future<int> inner_future = outer_future.unwrap();
int ii = inner_future.get();
BOOST_THREAD_LOG << "ii= "<< ii << "" << BOOST_THREAD_END_LOG;
}
}
catch (std::exception& ex)
{
std::cout << "ERRORRRRR "<<ex.what() << "" << std::endl;
BOOST_THREAD_LOG << "ERRORRRRR "<<ex.what() << "" << BOOST_THREAD_END_LOG;
return 1;
}
catch (...)
{
std::cout << " ERRORRRRR exception thrown" << std::endl;
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