chore: import upstream snapshot with attribution

data_structures/node.hpp

@@ -0,0 +1,46 @@
+/**
+ * @file
+ * @brief  Provides Node class and related utilities
+ **/
+#ifndef DATA_STRUCTURES_NODE_HPP_
+#define DATA_STRUCTURES_NODE_HPP_
+
+#include <iostream>  /// for std::cout
+#include <memory>    /// for std::shared_ptr
+#include <vector>    /// for std::vector
+
+/** Definition of the node as a linked-list
+ * \tparam ValueType type of data nodes of the linked list should contain
+ */
+template <class ValueType>
+struct Node {
+    using value_type = ValueType;
+    ValueType data = {};
+    std::shared_ptr<Node<ValueType>> next = {};
+};
+
+template <typename Node, typename Action>
+void traverse(const Node* const inNode, const Action& action) {
+    if (inNode) {
+        action(*inNode);
+        traverse(inNode->next.get(), action);
+    }
+}
+
+template <typename Node>
+void display_all(const Node* const inNode) {
+    traverse(inNode,
+             [](const Node& curNode) { std::cout << curNode.data << " "; });
+}
+
+template <typename Node>
+std::vector<typename Node::value_type> push_all_to_vector(
+    const Node* const inNode, const std::size_t expected_size = 0) {
+    std::vector<typename Node::value_type> res;
+    res.reserve(expected_size);
+    traverse(inNode,
+             [&res](const Node& curNode) { res.push_back(curNode.data); });
+    return res;
+}
+
+#endif  // DATA_STRUCTURES_NODE_HPP_