std::unique_lock<Mutex>::operator bool - cppreference.com
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    std::unique_lock<Mutex>::operator bool

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    std::unique_lock
     
    explicit operator bool() const noexcept;
    		(since C++11)

    Checks whether *this owns a locked mutex or not. Effectively calls owns_lock().

    Parameters

    (none)

    Return value

    true if *this has an associated mutex and has acquired ownership of it, false otherwise.

    See also