[racket] doubly linked list lib

Thank you very much for this nice intermediate solution, though I need
constant-time append, split, insert, remove, + pointers to items, etc.
Mutation does seem unavoidable, right.
I started my own lib, but if something already exists, I'm still interested.

The purpose is to make a hash with bounded memory, with replacement of
oldest items, or barely used items, or some other replacement criterion.

The final purpose is to make a memoization form with bounded memory, or
growing memory but with frequent removal of selected items. If I have time
to get there.

I'll keep the zipper in mind for other purposes though!

Laurent

On Tue, Aug 30, 2011 at 08:35, Danny Yoo <dyoo at cs.wpi.edu> wrote:

> > Nothing obvious, no. But Racket is designed to encourage programming
> without
> > mutation, and doubly linked lists require mutation.
> >
> > It's very likely a zipper will do what you want. A zipper is much easier
> to
> > implement than a doubly linked list, and has similar performance and
> uses.
>
>
> To supplement, here are very old notes I wrote to myself on the kind
> of list zipper that Neil is presenting:
>
>    https://hkn.eecs.berkeley.edu/~dyoo/plt/zippers.txt
> _________________________________________________
>  For list-related administrative tasks:
>  http://lists.racket-lang.org/listinfo/users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.racket-lang.org/users/archive/attachments/20110830/032fd531/attachment.html>