diff --git a/EGkSelection.h b/EGkSelection.h
index 7859466..a537518 100644
--- a/EGkSelection.h
+++ b/EGkSelection.h
@@ -36,6 +36,8 @@ struct SelData {
       : nId( nI), nSub( SEL_SUB_ALL) {}
    SelData( int nI, int nS)
       : nId( nI), nSub( nS) {}
+   bool operator == ( const SelData& other) const
+         { return ( nId == other.nId  &&  nSub == other.nSub) ; }
 } ;
 
 //----------------------------------------------------------------------------