1 files changed, 6 insertions, 1 deletions
diff --git a/src/resources/mstack.h b/src/resources/mstack.h
index ba1a58eb2..2a568bc5a 100644
--- a/src/resources/mstack.h
+++ b/src/resources/mstack.h
@@ -78,7 +78,7 @@ struct MStack final
             mPointer --;
     }
 
-    T &top()
+    T &top() const
     {
         return *mPointer;
     }
@@ -93,6 +93,11 @@ struct MStack final
         mPointer = mStack - 1;
     }
 
+    bool empty() const
+    {
+        return mPointer == mStartPointer;
+    }
+
     T *mStack;
 
     size_t mMaxSize;