async.cpp

#include <iostream>
#include <thread>
#include <chrono>
#include <future>

int main()
{
    auto future = std::async(std::launch::async, []
            {
                using namespace std::chrono_literals;
                std::this_thread::sleep_for(2s);
                std::cout << "sleepy thread... zzZZzz..." << std::endl;
            }
        );

    std::cout << "healthy thread" << std::endl;

    using namespace std::chrono_literals;
    std::this_thread::sleep_for(7s);
    std::cout << "healthy thread has slept for 7s" << std::endl;

    return 0;
}