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open Base
module Make_base_diff (M : sig
type t [@@deriving equal]
end) =
struct
let[@inline] get ~from ~to_ =
if phys_equal from to_ || M.equal from to_
then Optional_diff.none
else Optional_diff.return to_
;;
let[@inline] apply_exn _ t = t
let[@inline] of_list_exn = function
| [] -> Optional_diff.none
| _ :: _ as l -> Optional_diff.return (List.last_exn l)
;;
end
module Make_diff_plain (M : sig
type t [@@deriving equal]
end) =
struct
type derived_on = M.t
type t = M.t [@@deriving equal]
include Make_base_diff (M)
end
module Make_diff (M : sig
type t [@@deriving sexp, bin_io, equal]
end) =
struct
type derived_on = M.t
type t = M.t [@@deriving sexp, bin_io, equal]
include Make_base_diff (M)
end
module Make_plain (M : sig
type t [@@deriving equal]
end) =
struct
module Diff = Make_diff_plain (M)
end
module Make (M : sig
type t [@@deriving equal, sexp, bin_io]
end) =
struct
module Diff = Make_diff (M)
end