#include <iostream>
#include <boost/thread.hpp>
#include <boost/filesystem.hpp>

#define MULTI_THREAD

int main()
{
	boost::filesystem::path arg = L"test";

	if( !boost::filesystem::exists( arg ) )
		boost::filesystem::create_symlink( L"C:\\", arg );

	auto core = [=]() -> boost::filesystem::path {
		try {
			return boost::filesystem::canonical( arg );
		} catch( const std::exception& e ) {
			std::cout << e.what() << std::endl;
			return L"";
		}
	};

	boost::packaged_task<boost::filesystem::path> task1( core );
	boost::packaged_task<boost::filesystem::path> task2( core );
	boost::packaged_task<boost::filesystem::path> task3( core );
	boost::packaged_task<boost::filesystem::path> task4( core );

	auto ret1 = task1.get_future();
	auto ret2 = task2.get_future();
	auto ret3 = task3.get_future();
	auto ret4 = task4.get_future();

#ifdef MULTI_THREAD
	boost::thread( boost::move(task1) ).detach();
	boost::thread( boost::move(task2) ).detach();
	boost::thread( boost::move(task3) ).detach();
	boost::thread( boost::move(task4) ).detach();
#else
	task1(); task2(); task3(); task4();
#endif

	std::cout << ret1.get() << std::endl;
	std::cout << ret2.get() << std::endl;
	std::cout << ret3.get() << std::endl;
	std::cout << ret4.get() << std::endl;

	return 0;
}