std::future<T>::future

 

C++

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自立与有宿主实现

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工具库

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范围库 (C++20)

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技术规范

 

线程支持库

线程
thread (C++11)
jthread (C++20)
stop_token (C++20)
stop_source (C++20)
stop_callback (C++20)
hardware_destructive_interference_sizehardware_constructive_interference_size (C++17)(C++17)
this_thread 命名空间
get_id (C++11) yield (C++11)	sleep_for (C++11) sleep_until (C++11)
互斥
mutex (C++11) recursive_mutex (C++11) shared_mutex (C++17)	timed_mutex (C++11) recursive_timed_mutex (C++11) shared_timed_mutex (C++14)
通用锁管理
lock_guard (C++11) scoped_lock (C++17) unique_lock (C++11) shared_lock (C++14) defer_lock_ttry_to_lock_tadopt_lock_t (C++11)(C++11)(C++11)	lock (C++11) try_lock (C++11) defer_locktry_to_lockadopt_lock (C++11)(C++11)(C++11) once_flag (C++11) call_once (C++11)
条件变量
condition_variable (C++11)
condition_variable_any (C++11)
notify_all_at_thread_exit (C++11)
cv_status (C++11)
信号量
counting_semaphorebinary_semaphore (C++20)(C++20)
闩与屏障
latch (C++20)
barrier (C++20)
future
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)

 

std::future

future::future

future::~future

future::operator=

future::share

获取结果

future::get

状态

future::valid

future::wait

future::wait_for

future::wait_until

 

future() noexcept;	(1)	(C++11 起)
future( future&& other ) noexcept;	(2)	(C++11 起)
future( const future& other ) = delete;	(3)	(C++11 起)

构造 std::future 对象。

1) 默认构造函数。构造无共享状态的 std::future 。构造后， valid() == false 。

2) 移动构造函数。用移动语义，以 other 的共享状态构造 std::future 。构造后 other.valid() == false 。

3) std::future 不可复制构造 (CopyConstructible) 。

参数

other

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获得共享状态来源的另一 std::future