The Functionality template std::async runs the function file asynchronously (most likely within a separate thread which could be described as a A part of a thread pool) and returns a std::future that should sooner or later keep the result of that purpose call. one) Behaves just as if (2) is https://alphawireless.com/future-proofing-american-utilities-why-900-mhz-is-critical-for-utility-communications/