std::launch(3) C++ Standard Libary std::launch(3) NAME std::launch - std::launch Synopsis Defined in header <future> enum class launch : /* unspecified */ { async = /* unspecified */, deferred = /* unspecified */, (since C++11) /* implementation-defined */ }; std::launch is a BitmaskType. It specifies the launch policy for a task executed by the std::async function. The following constants denoting individual bits are defined by the standard library: Constant Explanation std::launch::async the task is executed on a different thread, poten- tially by creating and launching it first std::launch::deferred the task is executed on the calling thread the first time its result is requested (lazy evaluation) In addition, implementations are allowed to: * define additional bits and bitmasks to specify restrictions on task interactions applicable to a subset of launch policies, and * enable those additional bitmasks for the first (default) overload of std::async. Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behavior LWG 2102 C++11 std::launch was an it is not implementation-defined type implementa- tion-defined See also async runs a function asynchronously (potentially in a new thread) and returns a (C++11) std::future that will hold the result (function template) http://cppreference.com 2024.06.10 std::launch(3)
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