Version française
Home     About     Download     Resources     Contact us    
Browse thread
[Caml-list] removing an item from a list efficiently
[ Home ] [ Index: by date | by threads ]
[ Search: ]

[ Message by date: previous | next ] [ Message in thread: previous | next ] [ Thread: previous | next ]
Date: -- (:)
From: Stefano Zacchiroli <zack@b...>
Subject: Re: [Caml-list] removing an item from a list efficiently
[ Please don't Cc:-me, I'm subscribed to this list, as my
  Mail-Followup-To header can confirm ]

On Sat, Nov 08, 2003 at 12:49:48AM -0800, Dustin Sallings wrote:
> 	This is really what I was asking, whether ocaml lists could be 
> appropriate.
> 
> 	I'm having difficulty figuring out how to implement a double linked 
> list, though.  I want something like this:

I still think that lists, no matter if single or doubly linked aren't a
good structure for your cache, anyway ...

> type 'a link = Nothing | Link of 'a t;;
> type 'a t = {
>     data: 'a;
>     mutable prev: 'a link;
>     mutable next: 'a link;
> };;
> 	But, link and t don't know about each other.  How does one go about 
> doing this kind of thing in ocaml?

What do you mean? The above declaration isn't correct just because you
have to use an "and" instead of a "type" for the second declaration to
have two mutual recursive types. I don't know if this is really what
you're asking ...

Cheers.

-- 
^Stefano Zacchiroli -- Master in Computer Science @ Uni. Bologna, Italy$
^zack@{cs.unibo.it,debian.org,bononia.it} -- http://www.bononia.it/zack$
^Frequentando il mio maestro mi ero reso conto [.] che la logica poteva$
^servire a molto a condizione di entrarci dentro e poi di uscirne -Adso$

-------------------
To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr
Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/
Beginner's list: http://groups.yahoo.com/group/ocaml_beginners