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std::shared_future<T>:: ~shared_future

From cppreference.net
C++
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Free functions for atomic flags
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std::shared_future
~shared_future ( ) ;
(C++11 이후)

만약 * this 가 공유 상태를 참조하는 마지막 객체라면, 공유 상태를 파괴합니다. 그렇지 않으면 아무 작업도 수행하지 않습니다.