Re: [Caml-list] removing an item from a list efficiently

[Stefano Zacchiroli <zack@bononia.it>]

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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$

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