Std::start::deferred. std::future referring towards the shared condition made by this simply call to std::async. [edit] Launch procedures Should the function f returns a price or throws an exception, it's stored while in the shared state obtainable from the std::future that std::async returns for the caller. [edit] Deferred invocation annotations. https://alphawireless.com/future-proofing-american-utilities-why-900-mhz-is-critical-for-utility-communications/