On Sat, 8 Nov 2003, Dustin Sallings wrote:

> 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?
>

Use and:

type 'a link = Nothing | Something of 'a t 
and 'a t = { data: 'a; mutable next: 'a link; mutable prev: 'a link }

The other alternative is to not redefine option:

type 'a t = 
    { data: 'a; mutable next: 'a t option; mutable prev: 'a t option } 

Brian

-- 
"Usenet is like a herd of performing elephants with diarrhea -- massive,
difficult to redirect, awe-inspiring, entertaining, and a source of
mind-boggling amounts of excrement when you least expect it."
                                - Gene Spafford 
Brian

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