std::launch
Defined in header <future>
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enum class launch : /* unspecified */ { async = /* unspecified */, |
(since C++11) | |
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
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a new thread is launched to execute the task asynchronously |
std::launch::deferred
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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
(C++11) |
runs a function asynchronously (potentially in a new thread) and returns a std::future that will hold the result (function template) |