The Perform template std::async operates the function f asynchronously (possibly in the independent thread which might certainly be a part of a thread pool) and returns a std::future that can finally keep the results of that functionality call. one) Behaves as if (two) is called with policy being std::start::async std::future https://alphawireless.com/future-proofing-american-utilities-why-900-mhz-is-critical-for-utility-communications/