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std::latch:: ~latch

From cppreference.net
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std::latch
~latch ( ) ;
(自 C++20 起)

销毁 latch 。

注释

只有在所有线程都已被通知的情况下调用析构函数才是安全的。程序员必须确保一旦析构函数开始执行，没有线程会尝试在 * this 上等待。析构函数不会通知并释放任何等待中的线程。