alt Hacker News> The wait_for method is why we have a condition variable at all. If it weren’t for that guy, we could have used std::atomic‘s wait and notify_all methods.
No, the std::mutex is the reason you have a condition variable. Never mix std::atomic with std::mutex-and-friends, you are very likely introducing race conditions that way.
I think you are misunderstanding what the article suggests. std::atomic::wait and std::atomic::notify_all are the C++ abstractions over futexes. The whole concept of the future can be expressed in terms of atomics and futexes. The only problem is that the C++ standard doesn't have std::atomic::wait_for.