std::launch

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C++
 
线程的支持库
主题
Original:
Threads
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thread（C++11）
this_thread命名空间
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this_thread namespace
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get_id（C++11）
yield（C++11）
sleep_for（C++11）
sleep_until（C++11）
相互排斥
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Mutual exclusion
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mutex（C++11）
timed_mutex（C++11）
recursive_mutex（C++11）
recursive_timed_mutex（C++11）
通用锁管理
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Generic lock management
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lock_guard（C++11）
unique_lock（C++11）
defer_lock_t
try_to_lock_t
adopt_lock_t		（C++11）
（C++11）
（C++11）
lock（C++11）
try_lock（C++11）
defer_lock
try_to_lock
adopt_lock		（C++11）
（C++11）
（C++11）
条件变量
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Condition variables
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condition_variable（C++11）
condition_variable_any（C++11）
notify_all_at_thread_exit（C++11）
cv_status（C++11）
期货
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Futures
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promise（C++11）
future（C++11）
shared_future（C++11）
packaged_task（C++11）
async（C++11）
launch（C++11）
future_status（C++11）
future_error（C++11）
future_category（C++11）
future_errc（C++11）
 
Defined in header <future>
enum class launch : /* unspecified */ {

    async =    /* unspecified */,
    deferred = /* unspecified */,
    /* implementation-defined */

};
 （C++11 起）
。指定std::async功能执行的任务的启​​动策略。 std::launch是一个BitmaskType（枚举，整数或bitset的）.
Original:
Specifies the launch policy for a task executed by the std::async function. std::launch is a BitmaskType (enumeration, integer, or bitset).
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。表示的各个位的定义有以下常量由标准库。
Original:
The following constants denoting individual bits are defined by the standard library:
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。常数。
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Constant
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 Explanation
std::launch::async
。启动一个新的线程异步执行的任务。
Original:
a new thread is launched to execute the task asynchronously
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std::launch::deferred
。 在调用线程的第一次请求其结果（懒惰的评估）执行任务。
Original:
the task is executed on the calling thread the first time its result is requested (lazy evaluation)
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。此外，允许实现：。
Original:
In addition, implementations are allowed to:
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  • 。定义指定适用于发射政策的一个子集对任务的相互作用的限制的额外的位和位掩码。
    Original:
    define additional bits and bitmasks to specify restrictions on task interactions applicable to a subset of launch policies, and
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  • 。使这些额外的位掩码第一个（默认）过载std::async.
    Original:
    enable those additional bitmasks for the first (default) overload of std::async.
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[编辑] 。另请参阅。

（C++11）
异步运行的功能（可能在一个新的线程），并返回一个std::future，将持有的结果
Original:
runs a function asynchronously (potentially in a new thread) and returns a std::future that will hold the result
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（函数模板） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/thread/launch&oldid=28445”