AK: Add Queue::head()

This returns a const T& for the first element in the queue, without
dequeuing it.

1 files changed, 6 insertions, 0 deletions

diff --git a/AK/Queue.h b/AK/Queue.h
index 7a21c51b3a..157e07ea07 100644
--- a/AK/Queue.h
+++ b/AK/Queue.h
@@ -40,6 +40,12 @@ public:
         return value;
     }
 
+    const T& head() const
+    {
+        ASSERT(!is_empty());
+        return (*m_segments.first())[m_index_into_first];
+    }
+
     void clear()
     {
         m_segments.clear();