is ready method virtual from operation abstraction

alib2common/src/abstraction/OperationAbstraction.hpp

@@ -28,6 +28,7 @@ public:
 	virtual bool eval ( ) = 0;
 	virtual unsigned numberOfParams ( ) const = 0;
 	virtual bool cached ( ) const = 0;
+	virtual bool isReady ( ) const = 0;
 	virtual ext::type_index getParamTypeIndex ( unsigned index ) const = 0;
 	virtual ext::type_index getReturnTypeIndex ( ) const = 0;

alib2common/src/abstraction/ValueOperationAbstraction.hpp

@@ -289,7 +289,7 @@ public:
 		callback ( std::get < Indexes > ( inputs )->getValue ( std::get < Indexes > ( moves ) ) ... );
 	}
-	virtual bool isReady ( ) const {
+	virtual bool isReady ( ) const override {
 		return true;
 	}