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- "LLStack<T>" and "AStack<T>" are also class templates. While
- "Stack<T>" defines a family of abstract base classes,
- "LLStack<T>" and "AStack<T>" define two families of concrete stack
- classes. Stack classes created by using "LLStack<T>" and
- "AStack<T>" are derived from the "Stack<T>". "LLStack<T>" is
- based on a linked list and "AStack<T>" is based on an array.
- Because template classes created using "LLStack<T>" and
- "AStack<T>" are concrete, you can create an object out of their
- classes.
-