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    std::shared_lock<Mutex>:: ~shared_lock

    From ja.cppreference.net
    C++
    Concurrency support library
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    this_thread namespace
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    Free functions for atomic operations
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    Free functions for atomic flags
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    std::shared_lock
    ~shared_lock ( ) ;
    		(C++14以降)

    ロックを破棄します。

    * this が関連付けられたミューテックスを持ち（ mutex() が非ヌルポインタを返す）、かつその所有権を取得している場合（ owns() が true を返す）、ミューテックスは unlock_shared() を呼び出すことでアンロックされます。