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    std::defer_lock, std::try_to_lock, std::adopt_lock

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    defer_lock_t
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    lock(C++11)
    try_lock(C++11)
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    adopt_lock    		(C++11)
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    <tbody> </tbody>
    constexpr std::defer_lock_t defer_lock = std::defer_lock_t();
    		 (seit C++11)
    constexpr std::try_to_lock_t try_to_lock = std::try_to_lock_t();
    		 (seit C++11)
    constexpr std::adopt_lock_t adopt_lock = std::adopt_lock_t();
    		 (seit C++11)

    std::defer_lock, std::try_to_lock and std::adopt_lock are instances of empty struct tag types std::defer_lock_t, std::try_to_lock_t and std::adopt_lock_t respectively.

    They are used to specify locking strategies for std::lock_guard and std::unique_lock.

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