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diff --git a/src/core/expression/RBASizeOperator.hpp b/src/core/expression/RBASizeOperator.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.
+ */
+
+//
+// SizeOperator class header
+//
+
+#ifndef RBASIZEOPERATOR_HPP
+#define RBASIZEOPERATOR_HPP
+
+#include "RBASetOperator.hpp"
+
+namespace rba
+{
+
+class RBASizeOperator : public RBASetOperator
+{
+ public:
+  RBASizeOperator()=default;
+  RBASizeOperator(const RBASizeOperator&)=delete;
+  RBASizeOperator(const RBASizeOperator&&)=delete;
+  RBASizeOperator& operator=(const RBASizeOperator&)=delete;
+  RBASizeOperator& operator=(const RBASizeOperator&&)=delete;
+  virtual ~RBASizeOperator()=default;
+
+  void accept(RBAExpressionVisitor& visitor) override;
+  RBAModelElementType getModelElementType() const override;
+  std::int32_t getValueCore(RBAConstraintInfo* info, RBAArbitrator* arb) const override;
+#ifdef RBA_USE_LOG
+  const std::string getSymbol() const override;
+  const std::string getExpressionText() const override;
+  const std::string getCoverageExpressionText() const override;
+#endif
+};
+
+} /* namespace rba */
+
+#endif /* SRC_CORE_EXPRESSION_RBASIZEOPERATOR_HPP_ */