--- /dev/null
+#ifndef __NEXT_EXPR_VAR_NODE_H__
+#define __NEXT_EXPR_VAR_NODE_H__
+
+#include "nest/VarID.h"
+
+#include "nest/expr/Forward.h"
+#include "nest/expr/Visitor.h"
+#include "nest/expr/Node.h"
+
+namespace nest
+{
+namespace expr
+{
+
+class VarNode final : public Node
+{
+public:
+ VarNode(const VarID &id) : _id{id}
+ {
+ // DO NOTHING
+ }
+
+public:
+ const VarNode *asVar(void) const override { return this; }
+
+public:
+ const VarID &id(void) const { return _id; }
+
+private:
+ VarID const _id;
+};
+
+} // namespace expr
+} // namespace nest
+
+#endif // __NEXT_EXPR_VAR_NODE_H__
--- /dev/null
+#include "nest/expr/VarNode.h"
+
+#include <memory>
+
+#include <gtest/gtest.h>
+
+TEST(VAR_NODE, ctor)
+{
+ auto make = [](uint32_t n) {
+ const nest::VarID id{n};
+
+ return std::make_shared<nest::expr::VarNode>(id);
+ };
+
+ auto node = make(4);
+
+ // NOTE 'id' should be copied
+ ASSERT_EQ(node->id().value(), 4);
+}
+
+TEST(VAR_NODE, cast)
+{
+ const nest::VarID id{0};
+
+ auto derived = std::make_shared<nest::expr::VarNode>(id);
+ std::shared_ptr<nest::expr::Node> base = derived;
+
+ // NOTE Cast method should be overrided
+ ASSERT_NE(derived.get(), nullptr);
+ ASSERT_EQ(base->asVar(), derived.get());
+}