The Operate template std::async operates the purpose f asynchronously (likely in the separate thread which might certainly be a Portion of a thread pool) and returns a std::future that will sooner or later keep the result of that operate call. 1) Behaves like (two) is named with coverage being std::launch::async https://alphawireless.com/future-proofing-american-utilities-why-900-mhz-is-critical-for-utility-communications/