fork(2) download

#include <future>
#include <iostream>
#include <string>
 
int main()
{
	int foo = 0;
	bool bar = false;
	std::future<std::string> async_request = std::async(
		std::launch::async,
		[=, &foo](bool& is_pumping_request) -> std::string {
			return "str";
		},
		bar
	);
    std::cout << async_request.get() << std::endl;
}

In file included from /usr/include/c++/5/future:38:0,
                 from prog.cpp:1:
/usr/include/c++/5/functional: In instantiation of 'struct std::_Bind_simple<main()::<lambda(bool&)>(bool)>':
/usr/include/c++/5/future:1709:67:   required from 'std::future<typename std::result_of<_Functor(_ArgTypes ...)>::type> std::async(std::launch, _Fn&&, _Args&& ...) [with _Fn = main()::<lambda(bool&)>; _Args = {bool&}; typename std::result_of<_Functor(_ArgTypes ...)>::type = std::basic_string<char>]'
prog.cpp:15:2:   required from here
/usr/include/c++/5/functional:1505:61: error: no type named 'type' in 'class std::result_of<main()::<lambda(bool&)>(bool)>'
       typedef typename result_of<_Callable(_Args...)>::type result_type;
                                                             ^
/usr/include/c++/5/functional:1526:9: error: no type named 'type' in 'class std::result_of<main()::<lambda(bool&)>(bool)>'
         _M_invoke(_Index_tuple<_Indices...>)
         ^

Standard output is empty