std::launch - cppreference.com
From cppreference.com
|
|
(since C++11) | |
std::launch is a BitmaskType. It specifies the launch policy for a task executed by the std::async function.
Constants
The following constants denoting individual bits are defined by the standard library:
| Enumerator | Meaning |
async
|
the task is executed on a different thread, potentially by creating and launching it first |
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 retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 2102 | C++11 | std::launch was an implementation-defined type
|
it is not implementation-defined |
See also
| runs a function asynchronously (potentially in a new thread) and returns a std::future that will hold the result (function template) [edit] |