1 files changed, 8 insertions, 1 deletions
diff --git a/searchcommon/src/vespa/searchcommon/attribute/i_attribute_functor.h b/searchcommon/src/vespa/searchcommon/attribute/i_attribute_functor.h
index fc657d606f9..90484f8cc3a 100644
--- a/searchcommon/src/vespa/searchcommon/attribute/i_attribute_functor.h
+++ b/searchcommon/src/vespa/searchcommon/attribute/i_attribute_functor.h
@@ -13,10 +13,17 @@ class IAttributeVector;
  * thread as async callback from asyncForEachAttribute() call on
  * attribute manager.
  */
-class IAttributeFunctor
+class IConstAttributeFunctor
 {
 public:
     virtual void operator()(const IAttributeVector &attributeVector) = 0;
+    virtual ~IConstAttributeFunctor() { }
+};
+
+class IAttributeFunctor
+{
+public:
+    virtual void operator()(IAttributeVector &attributeVector) = 0;
     virtual ~IAttributeFunctor() { }
 };