The Perform template std::async operates the perform file asynchronously (perhaps in a individual thread which could become a Element of a thread pool) and returns a std::future that can inevitably hold the result of that purpose connect with. 1) Behaves as though (2) known as with policy getting std::start::async FutureWarning: https://alphawireless.com/future-proofing-american-utilities-why-900-mhz-is-critical-for-utility-communications/