std::launch (3) - Linux Man Pages

std::launch: std::launch

NAME

std::launch - std::launch

Synopsis


Defined in header <future>
enum class launch : /* unspecified */ {
async = /* unspecified */,
deferred = /* unspecified */, (since C++11)
/* implementation-defined */
};


Specifies the launch policy for a task executed by the std::async function. std::launch is an enumeration used as BitmaskType.
The following constants denoting individual bits are defined by the standard library:


Constant Explanation
std::launch::async a new thread is launched to execute the task asynchronously
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.

See also


async runs a function asynchronously (potentially in a new thread) and returns a std::future that will hold the result
        (function template)
(C++11)