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diff --git a/src/core/expression/RBAOperator.hpp b/src/core/expression/RBAOperator.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.
+ */
+
+/**
+ * Operator class header
+ */
+
+#ifndef RBAOPERATOR_HPP
+#define RBAOPERATOR_HPP
+
+#include <vector>
+#include "RBAExpression.hpp"
+
+namespace rba
+{
+
+class DLL_EXPORT RBAOperator : public RBAExpression
+{
+protected:
+  RBAOperator()=default;
+  RBAOperator(const RBAOperator&)=delete;
+  RBAOperator(const RBAOperator&&)=delete;
+  RBAOperator& operator=(const RBAOperator&)=delete;
+  RBAOperator& operator=(const RBAOperator&&)=delete;
+
+public:
+  const std::vector<RBAExpression*>& getOperand() const;
+  void addOperand(RBAExpression* const newExpr);
+  RBAExpression* getLhsOperand() const;
+  RBAExpression* getRhsOperand() const;
+
+  // Log
+#ifdef RBA_USE_LOG
+  virtual const std::string getSymbol() const;
+  void createHierarchy() override;
+#endif
+
+protected:
+  std::string const getPreMsg(const bool isPrevious) const;
+
+private:
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable:4251)
+#endif
+  std::vector<RBAExpression*> operand_;
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+};
+
+}
+
+#endif