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std::lock_guard<Mutex>:: ~lock_guard

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std::lock_guard
Member functions
lock_guard::~lock_guard
~lock_guard ( ) ;
(начиная с C++11)

Освобождает владение принадлежащим мьютексом.

Эффективно вызывает m. unlock ( ) где m - это мьютекс, переданный в конструктор lock_guard .