| Defined in header <future> | ||
|---|---|---|
enum class launch : /* unspecified */ {
async = /* unspecified */,
deferred = /* unspecified */,
/* implementation-defined */
}; | (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 | 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
| (C++11) | runs a function asynchronously (potentially in a new thread) and returns a std::future that will hold the result (function template) |
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