Added const to circular_q empty() and full()
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		@@ -71,12 +71,12 @@ public:
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        }
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					        }
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    }
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					    }
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    bool empty()
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					    bool empty() const
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    {
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					    {
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        return tail_ == head_;
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					        return tail_ == head_;
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    }
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					    }
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    bool full()
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					    bool full() const
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    {
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					    {
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        // head is ahead of the tail by 1
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					        // head is ahead of the tail by 1
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        return ((tail_ + 1) % max_items_) == head_;
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					        return ((tail_ + 1) % max_items_) == head_;
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