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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 <iostream>
#define USE_STD 0
#define USE_BOOST 1
#define USED_THREAD_API USE_BOOST
//#define USED_THREAD_API USE_STD
#if USED_THREAD_API == USE_BOOST
# define BOOST_THREAD_VERSION 4
# include <boost/thread/future.hpp>
using boost::future;
using boost::async;
#endif
#if USED_THREAD_API == USE_STD
# include <future>
using std::future;
using std::async;
#endif
future<void> do_something()
{
auto result = async( []{ std::cout<< "A\n"; } );
std::cout << "B\n";
return result; // error here
}
int main()
{
do_something().wait();
std::cout << "Hello, World!" << std::endl;
return 0;
}
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