--- /dev/null
+/*
+ * Copyright (c) 2019 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 __TF_DIALECT_VARIADIC_ARITY_NODE_H__
+#define __TF_DIALECT_VARIADIC_ARITY_NODE_H__
+
+#include <loco/IR/Node.h>
+#include <loco/IR/Use.h>
+
+#include <vector>
+#include <memory>
+#include <cassert>
+
+namespace moco
+{
+namespace tf
+{
+
+/**
+ * @brief Nodes with the variadic inputs
+ */
+template <typename Base> class VariadicArityNode : public Base
+{
+public:
+ VariadicArityNode(uint32_t arity)
+ {
+ for (uint32_t n = 0; n < arity; ++n)
+ {
+ _args.emplace_back(std::move(std::unique_ptr<loco::Use>{new loco::Use{this}}));
+ }
+ };
+
+ virtual ~VariadicArityNode() = default;
+
+public:
+ uint32_t arity(void) const final { return _args.size(); }
+
+ loco::Node *arg(uint32_t n) const final
+ {
+ assert(n < _args.size());
+ return _args.at(n)->node();
+ }
+
+ void drop(void) final
+ {
+ for (uint32_t n = 0; n < _args.size(); ++n)
+ {
+ _args.at(n)->node(nullptr);
+ }
+ }
+
+protected:
+ // This API allows inherited classes to access "_args" field.
+ loco::Use *at(uint32_t n) const
+ {
+ assert(n < _args.size());
+ return _args.at(n).get();
+ }
+
+private:
+ std::vector<std::unique_ptr<loco::Use>> _args;
+};
+
+} // namespace tf
+} // namespace moco
+
+#endif // __TF_DIALECT_VARIADIC_ARITY_NODE_H__
--- /dev/null
+/*
+ * Copyright (c) 2019 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.
+ */
+
+#include "VariadicArityNode.h"
+
+#include <loco/IR/Nodes.h>
+
+#include <gtest/gtest.h>
+
+namespace
+{
+
+using namespace moco::tf;
+
+class ArbitraryInputNode : public VariadicArityNode<loco::Node>
+{
+public:
+ ArbitraryInputNode(uint32_t arity) : VariadicArityNode<loco::Node>(arity) {}
+
+ void input(uint32_t idx, loco::Node *node) { at(idx)->node(node); }
+ loco::Node *input(uint32_t idx) const { return at(idx)->node(); }
+
+ const loco::Dialect *dialect(void) const { return nullptr; } // this won't be called for testing
+ uint32_t opnum(void) const { return -1; } // this won't be called for testing
+};
+
+} // namespace
+
+TEST(CustomOpTest, VariadicArityNode_arity_n)
+{
+ loco::ConstGen cg0, cg1, cg2;
+
+ ArbitraryInputNode a_node(3);
+ a_node.input(0, &cg0);
+ a_node.input(1, &cg1);
+ a_node.input(2, &cg2);
+
+ ASSERT_EQ(a_node.arity(), 3);
+ ASSERT_EQ(a_node.input(0), &cg0);
+ ASSERT_EQ(a_node.input(1), &cg1);
+ ASSERT_EQ(a_node.input(2), &cg2);
+}