(********************************************************************)
(*  OCaml code from the book ``Learn Programming with OCaml''       *)
(*  See https://usr.lmf.cnrs.fr/lpo/                                *)
(*                                                                  *)
(*  Sylvain Conchon and Jean-Christophe Filliâtre                   *)
(*  Copyright 2025 Université Paris-Saclay and CNRS                 *)
(*                                                                  *)
(*  Openly licensed via CC BY SA 4.0                                *)
(*  See https://creativecommons.org/licenses/by-sa/4.0/deed.en      *)
(********************************************************************)

(* Program 23 on page 178
   Iteration Over the Set Bits of a Bit Vector *)

let iteri_true f v =
  Array.iteri
    (fun i ei ->
       let index = i * bpi in
       let rec visit x =
         if x <> 0 then begin
           let b = x land -x in
           f (index + ntz b);
           visit (x - b)
         end
       in
       visit ei)
    v.bits

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