std::launch
STD：启动
| Defined in header | | |
|---|---|---|
| enum class launch : /* unspecified */ { async = /* unspecified */, deferred = /* unspecified */, /* implementation-defined */ }; | | (since C++11) |
对象执行的任务的启动策略。std::async功能。std::launch是用作BitmaskType...
标准库定义了表示单个位的下列常量：
| 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) |
此外，还允许实现：
- 定义额外的位位和位掩码，以指定适用于启动策略子集的任务交互的限制，以及
- 为第一个%28默认%29重载启用这些额外的位掩码。
std::async...
另见
| async (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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