What is the purpose of the LList class in the custom doubly linked list implementation?

• A. To provide an STL-like interface for a doubly linked list.
• B. To implement a stack.
• C. To implement a queue using arrays.
• D. To manage memory only.

Answer: (A)

The main idea is that the LList class serves as a general, STL-like container for a doubly linked list. It wraps the internal node structure and exposes a familiar API—iterators, and typical container operations like insertion, deletion, traversal, and size queries—so users can interact with the list in a standard, generic way rather than manipulating raw pointers directly. This makes the list compatible with algorithms and patterns that expect standard containers.

This isn’t about implementing a specific role like a stack or a queue; those would impose particular usage patterns (LIFO or FIFO) on top of the list. It’s also not solely about memory management, which would ignore the need for a usable, high‑level interface. By providing an STL-like interface, the LList class offers both the structural benefits of a doubly linked list and the familiar, reusable operations that programmers expect from a container.