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diff --git a/src/core/expression/RBAPlusOperatorMaker.hpp b/src/core/expression/RBAPlusOperatorMaker.hpp
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+/**
+ * Copyright (c) 2019 DENSO CORPORATION.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/// @file  RBAPlusOperatorsMaker.hpp
+/// @brief PlusOperator object generator class header
+
+#ifndef RBAPLUSOPERATORMAKER_HPP
+#define RBAPLUSOPERATORMAKER_HPP
+
+#include "RBAOperatorMaker.hpp"
+
+namespace rba
+{
+
+/// @brief PlusOperator object generator class
+class RBAPlusOperatorMaker : public RBAOperatorMaker
+{
+public:
+  RBAPlusOperatorMaker();
+  RBAPlusOperatorMaker(const RBAPlusOperatorMaker&)=delete;
+  RBAPlusOperatorMaker(const RBAPlusOperatorMaker&&)=delete;
+  RBAPlusOperatorMaker& operator=(const RBAPlusOperatorMaker&)=delete;
+  RBAPlusOperatorMaker& operator=(const RBAPlusOperatorMaker&&)=delete;
+  virtual ~RBAPlusOperatorMaker()=default;
+
+protected:
+  /// @brief generate an empty instance
+  /// @details generate an empty instance of unique_ptr in derived class
+  /// @return unique_ptr for instance
+  std::unique_ptr<RBAModelElement> createInstance(const std::string& name="") override;
+
+};
+
+}
+
+#endif