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diff --git a/src/optimize/RBAAllwaysCheckConstraintCollector.hpp b/src/optimize/RBAAllwaysCheckConstraintCollector.hpp
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+++ b/src/optimize/RBAAllwaysCheckConstraintCollector.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.
+ */
+
+//
+// RBAAllwaysCheckConstraintCollector.hpp
+//
+
+#ifndef RBAALLWAYSCHECKCONSTRAINTSETTER_HPP
+#define RBAALLWAYSCHECKCONSTRAINTSETTER_HPP
+
+#include "RBAAbstractCollector.hpp"
+
+namespace rba
+{
+class RBAConstraintImpl;
+
+class RBAAllwaysCheckConstraintCollector : public RBAAbstractCollector
+{
+ public:
+  RBAAllwaysCheckConstraintCollector(RBAModelImpl* const model);
+  RBAAllwaysCheckConstraintCollector(const RBAAllwaysCheckConstraintCollector&)=default;
+  RBAAllwaysCheckConstraintCollector(RBAAllwaysCheckConstraintCollector&&)=default;
+  RBAAllwaysCheckConstraintCollector& operator=(const RBAAllwaysCheckConstraintCollector&)=default;
+  RBAAllwaysCheckConstraintCollector& operator=(RBAAllwaysCheckConstraintCollector&&)=default;
+  virtual ~RBAAllwaysCheckConstraintCollector()=default;
+  void init(const RBAConstraintImpl* const constraint);
+  bool isAllways() const;
+  void visit(RBAPreviousModifier& exp) final;
+ private:
+  // Constraint expression during search
+  const RBAConstraintImpl* constraint_ {nullptr};
+  // True if the constraint expression being searched is a constraint expression that must always be arbitrated
+  bool isAllways_ {false};
+};
+
+} /* namespace rba */
+
+#endif /* RBAALLWAYSCHECKCONSTRAINTSETTER_HPP */