1 files changed, 40 insertions, 0 deletions
diff --git a/compiler/nest/core/include/nest/expr/Visitor.h b/compiler/nest/core/include/nest/expr/Visitor.h
new file mode 100644
index 000000000..84f70e9f4
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+++ b/compiler/nest/core/include/nest/expr/Visitor.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * 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.
+ */
+
+#ifndef __NEST_EXPR_VISITOR_H__
+#define __NEST_EXPR_VISITOR_H__
+
+#include "nest/expr/Macro.h"
+#include "nest/expr/Forward.h"
+
+namespace nest
+{
+namespace expr
+{
+
+template <typename T> struct Visitor
+{
+  virtual ~Visitor() = default;
+
+#define EXPR(Tag) virtual T visit(const NEST_EXPR_CLASS_NAME(Tag) *) = 0;
+#include "nest/expr/Node.def"
+#undef EXPR
+};
+
+} // namespace expr
+} // namespace nest
+
+#endif // __NEST_EXPR_VISITOR_H__