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std::future<T>:: ~future

From cppreference.net
C++
Concurrency support library
Threads
(C++11)
(C++20)
(C++17) (C++17)
this_thread namespace
(C++11)
(C++11)
Cooperative cancellation
Mutual exclusion
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Condition variables
(C++11)
(C++11)
(C++11)
(C++11)
Semaphores
(C++20) (C++20)
Latches and Barriers
(C++20)
(C++20)
Futures
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
Safe reclamation
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(C++26)
(C++26)
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Atomic types
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Initialization of atomic types
(C++11) (deprecated in C++20)
(C++11) (deprecated in C++20)
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Memory ordering
(C++11)
(C++11) (deprecated in C++26)
(C++11)
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Free functions for atomic operations
(C++11) (C++11)
(C++11) (C++11)
(C++11) (C++11)
(C++11) (C++11) (C++11) (C++11)
(C++11) (C++11)
(C++11) (C++11)
(C++11) (C++11)
(C++11) (C++11)
(C++11) (C++11)
(C++26) (C++26)
(C++26) (C++26)
(C++11)
(C++20) (C++20)
(C++20)
(C++20)
Free functions for atomic flags
(C++11) (C++11)
(C++11) (C++11)
(C++20) (C++20)
(C++20) (C++20)
(C++20)
(C++20)
std::future
~future ( ) ;
(自 C++11 起)

释放所有共享状态。这意味着：

  • 若当前对象持有其共享状态的最后引用，则共享状态将被销毁。
  • 当前对象放弃对其共享状态的引用。
  • 以下操作通常不会因等待共享状态就绪而阻塞，除非满足以下所有条件时可能发生阻塞：
    • 该共享状态是通过调用 std::async 创建的。
    • 共享状态尚未就绪。
    • 当前对象是共享状态的最后一个引用。
(since C++14)