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+/*
+ * 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 __NEURUN_UTIL_OBJECT_MANAGER_H__
+#define __NEURUN_UTIL_OBJECT_MANAGER_H__
+
+#include <unordered_map>
+#include <memory>
+
+namespace neurun
+{
+namespace util
+{
+
+/**
+ * @brief Class that owns objects and maps them with indices as a handle for them
+ *
+ */
+template <typename Index, typename Object> class ObjectManager
+{
+public:
+ ObjectManager() : _index_count{0u} {}
+
+public:
+ /**
+ * @brief Create an object with args and put it in the container with a new Index for that
+ *
+ * @param[in] args Arguments for creating Operand object
+ * @return Created index that is associated to the object
+ */
+ template <class... Args> Index emplace(Args &&... args)
+ {
+ auto index = generateIndex();
+ _objects.emplace(index, nnfw::cpp14::make_unique<Object>(std::forward<Args>(args)...));
+ return index;
+ }
+
+ /**
+ * @brief Put object in the container with a new Index for that
+ *
+ * @param[in] object Object to be pushed
+ * @return Created index that is associated to the object
+ */
+ Index push(std::unique_ptr<Object> &&object)
+ {
+ auto index = generateIndex();
+ _objects.emplace(index, std::move(object));
+ return index;
+ }
+
+ /**
+ * @brief Remove the object that is associated with the given index
+ *
+ * @param[in] index Index of the object to be removed
+ * @return N/A
+ */
+ void remove(const Index &index) { _objects.erase(index); };
+
+ /**
+ * @brief Get the object that is associated with the given index
+ *
+ * @param[in] index Index of the object to be returned
+ * @return Object
+ */
+ const Object &at(const Index &index) const { return *(_objects.at(index)); }
+ /**
+ * @brief Get the object that is associated with the given index
+ *
+ * @param[in] index Index of the object to be returned
+ * @return Object
+ */
+ Object &at(const Index &index) { return *(_objects.at(index)); }
+ /**
+ * @brief Get the object that is associated with the given index
+ *
+ * @param[in] index Index of the object to be returned
+ * @return true if such entry exists otherwise false
+ */
+ bool exist(const Index &index) const
+ {
+ auto it = _objects.find(index);
+ return it != _objects.end();
+ }
+ /**
+ * @brief Iterate over the container with given function
+ *
+ * @param[in] fn Function to be run for every container entry
+ * @return N/A
+ */
+ void iterate(const std::function<void(const Index &, const Object &)> &fn) const
+ {
+ for (const auto &e : _objects)
+ {
+ fn(e.first, *e.second);
+ }
+ }
+ /**
+ * @brief Iterate over the container with given function
+ *
+ * @param[in] fn Function to be run for every container entry
+ * @return N/A
+ */
+ void iterate(const std::function<void(const Index &, Object &)> &fn)
+ {
+ // TODO Remove this workaround
+ // This implementation is a workaround in case of adding operands while iteration
+ std::list<Index> l;
+
+ for (auto &e : _objects)
+ {
+ l.push_back(e.first);
+ }
+
+ for (auto index : l)
+ {
+ fn(index, *_objects[index]);
+ }
+ }
+
+private:
+ Index generateIndex() { return Index{_index_count++}; }
+
+private:
+ std::unordered_map<Index, std::unique_ptr<Object>> _objects;
+ uint32_t _index_count;
+};
+
+} // namespace util
+} // namespace neurun
+
+#endif // __NEURUN_UTIL_OBJECT_MANAGER_H__