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std::shared_future<T>::~shared_future

来自cppreference.com
 
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std::shared_future
 
~shared_future();
 (C++11 起)

若 *this 是指代共享状态的最后一个对象，则销毁共享状态。否则不做任何事。

来自“https://zh.cppreference.com/mwiki/index.php?title=cpp/thread/shared_future/%7Eshared_future&oldid=47630”