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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;

}