BoundedQueue::Size() Interface read error

[ayongsir]

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I used BoundedQueue in multithreading and found an exception reading Size() during testing; The task queue I set is 500, But the size I read is unusually large: 18446744073709551614; It should be caused by a negative number in unsigned number subtraction: template <typename T> inline uint64_t BoundedQueue<T>::Size() { return tail_ - head_ - 1; }

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[ayongsir]