#include <chrono>

#include <future>

#include <iostream>

#include <thread>

int find_answer_how_old_universe_is() {

std::this_thread::sleep_for(std::chrono::seconds(5));

return 5;

}

void do_other_calculations() { std::cout << "Doing other stuff " << std::endl; }

int main() {

std::future<int> the_answer_future =

std::async(find_answer_how_old_universe_is);

// ....

do_other_calculations();

// ...

std::cout << "The universe age is " << the_answer_future.get() << "s."

<< std::endl;

}