(********************************************************************)
(*  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 21 on page 175
   Reading and Writing in a Bit Vector *)

let get v n =
  let i = n / bpi and j = n mod bpi in
  (v.bits.(i) lsr j) land 1 <> 0

let set v n b =
  let i = n / bpi and j = n mod bpi in
  if b then
    v.bits.(i) <- v.bits.(i) lor (1 lsl j)
  else
    v.bits.(i) <- v.bits.(i) land lnot (1 lsl j)

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