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- Lock doesn’t have to taken right at the construction, you can pass the flag std::defer_lock during its construction to keep the mutex unlocked during construction.
std::unique_lock<std::mutex>(mutex, std::defer_lock);
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We can unlock it before the function ends and don’t have to necessarily wait for destructor to release it, which can be handy.
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You can pass the ownership of the lock from a function, it is movable and not copyable.
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It can be used with conditional variables since that requires mutex to be locked, condition checked and unlocked while waiting for a condition.
std::unique_lock<std::mutex> lock { _mutex };
_condition.wait(lock);