Move asDocumentWeightAttribute() to IAttributeVector.

1 files changed, 8 insertions, 0 deletions

diff --git a/searchcommon/src/vespa/searchcommon/attribute/iattributevector.h b/searchcommon/src/vespa/searchcommon/attribute/iattributevector.h
index edc71591175..331e950879a 100644
--- a/searchcommon/src/vespa/searchcommon/attribute/iattributevector.h
+++ b/searchcommon/src/vespa/searchcommon/attribute/iattributevector.h
@@ -11,6 +11,7 @@
 
 namespace search {
 
+class IDocumentWeightAttribute;
 class QueryTermSimple;
 
 namespace attribute {
@@ -255,6 +256,13 @@ public:
                                                                 const SearchContextParams &params) const = 0;
 
     /**
+     * Type-safe down-cast to an attribute supporting direct document weight iterators.
+     *
+     * @return document weight attribute or nullptr if not supported.
+     */
+    virtual const IDocumentWeightAttribute *asDocumentWeightAttribute() const = 0;
+
+    /**
      * Returns the basic type of this attribute vector.
      *
      * @return basic type