Add get_id() method to node class for unique identification

Author: riccardodebenedictis

include/a_star.hpp

@@ -14,6 +14,16 @@ namespace utils
     node(std::weak_ptr<node<Tp>> parent, const Tp &g_cost) noexcept : parent_node(std::move(parent)), g(g_cost) {}
     virtual ~node() = default;
 
+    /**
+     * @brief Returns a unique identifier for the node.
+     *
+     * This function provides a way to uniquely identify each node instance.
+     * The identifier is derived from the memory address of the node object.
+     *
+     * @return A uintptr_t representing the unique identifier of the node.
+     */
+    [[nodiscard]] uintptr_t get_id() const noexcept { return reinterpret_cast<uintptr_t>(this); }
+
     /**
      * @brief Returns a shared pointer to the parent node.
      *