- make-list-queue list #!optional lastprocedure
Returns a newly allocated list queue containing the elements of list in order. The result shares storage with list. If the last argument is not provided, this operation is O(n) where n is the length of list.
However, if last is provided, make-list-queue returns a newly allocated list queue containing the elements of the list whose first pair is first and whose last pair is last. It is an error if the pairs do not belong to the same list. Alternatively, both first and last can be the empty list. In either case, the operation is O(1).
Note: To apply a non-destructive list procedure to a list queue and return a new list queue, use (make-list-queue (proc (list-queue-list list-queue))).