1402Self-referencing array init
- Oct 1 3:07 AMocaml 3.06
I'm sure there's a simple way to do this, but I just can't think of
I want to do something like:
let arr = Array.init 10 (...use arr...)
In my case, I want to stick a bunch of objects in an array, and
reference that array in one of their callbacks. A simplified (and
less sensible) version would look something like:
let arr = Array.init 10
(fun i -> Some (fun () -> if arr.(9-i) = None then
prerr_endline "Ouch" ))
When I feed this to ocaml, it complains about arr being unbound.
Doing a "let rec" yields the following amusing message:
This kind of expression is not allowed as right-hand side of `let rec'
In the silly case above, there's a reasonable default value, but
that's not the case in my actual (lablgtk2) program.
I don't like the following alternative:
let arr = ref None
in arr := Some (Array.init 10 ...)
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