libluna: Add CircularQueue::is_empty()

libluna/include/luna/CircularQueue.h

@@ -16,6 +16,11 @@ template <typename T, usize Size> class CircularQueue
     {
     }
 
+    bool is_empty()
+    {
+        return m_tail.load() == m_head.load();
+    }
+
     bool try_push(const T& value)
     {
         usize current_tail = m_tail.load(MemoryOrder::Relaxed);
@@ -71,6 +76,11 @@ template <typename T> class DynamicCircularQueue
         if (m_data) free_impl(m_data);
     }
 
+    bool is_empty()
+    {
+        return m_tail.load() == m_head.load();
+    }
+
     Result<void> set_size(usize size)
     {
         m_data = (T*)TRY(calloc_impl(size + 1, sizeof(T), false));