diff --git a/analitza/operator.h b/analitza/operator.h
--- a/analitza/operator.h
+++ b/analitza/operator.h
@@ -68,6 +68,9 @@
         };
         /** Constructor. Creates an operator with @p t type .*/
         explicit Operator(OperatorType t) : Object(oper), m_optype(t) {}
+
+        /** Copy constructor */
+        constexpr Operator(const Operator&) = default;
         
         /** Destructor */
         virtual ~Operator() {}