Accessing elements of a dll

(dll-element dll node)

Get the element of a node in a doubly linked list dll.

(dll-first dll)

Return the first element on the doubly linked list dll. Return nil if the list is empty. The element is not removed.

(dll-nth dll n)

Return the nth node from the doubly linked list dll. n counts from zero. If dll is not that long, nil is returned. If n is negative, return the -(n+1)th last element. Thus, (dll-nth dll 0) returns the first node, and (dll-nth dll -1) returns the last node.

(dll-last dll)

Return the last element on the doubly linked list dll. Return nil if the list is empty. The element is not removed.

(dll-next dll node)

Return the last element on the doubly linked list dll. Return nil if the list is empty. The element is not removed.

(dll-previous dll node)

Return the node before node, or nil if node is the first node.

(dll-all dll)

Return all elements on the double linked list dll as an ordinary list.

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