libluna: Add support for range-based iteration to LinkedList

libluna/include/luna/LinkedList.h

@@ -210,6 +210,47 @@ template <typename T> class LinkedList
         return m_count;
     }
 
+    struct LinkedListIterator
+    {
+        typedef T* PtrT;
+
+      private:
+        LinkedListIterator(PtrT ptr, LinkedList<T>& list) : m_ptr(ptr), m_list(list)
+        {
+        }
+
+        PtrT m_ptr;
+        LinkedList<T>& m_list;
+
+      public:
+        PtrT& operator*()
+        {
+            return m_ptr;
+        }
+
+        void operator++()
+        {
+            m_ptr = m_list.next(m_ptr).value_or(nullptr);
+        }
+
+        bool operator!=(LinkedListIterator& other)
+        {
+            return m_ptr != other.m_ptr || &m_list != &other.m_list;
+        }
+
+        friend class LinkedList<T>;
+    };
+
+    LinkedListIterator begin()
+    {
+        return { (T*)m_start_node, *this };
+    }
+
+    LinkedListIterator end()
+    {
+        return { nullptr, *this };
+    }
+
   private:
     Node* m_start_node = nullptr;
     Node* m_end_node = nullptr;