Source file comparable.ml
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open! Import
include Comparable_intf
module With_zero (T : sig
type t [@@deriving_inline compare]
include Ppx_compare_lib.Comparable.S with type t := t
[@@@end]
val zero : t
end) =
struct
open T
let is_positive t = compare t zero > 0
let is_non_negative t = compare t zero >= 0
let is_negative t = compare t zero < 0
let is_non_positive t = compare t zero <= 0
let sign t = Sign0.of_int (compare t zero)
end
module Poly (T : sig
type t [@@deriving_inline sexp_of]
val sexp_of_t : t -> Sexplib0.Sexp.t
[@@@end]
end) =
struct
module Replace_polymorphic_compare = struct
type t = T.t [@@deriving_inline sexp_of]
let sexp_of_t = (T.sexp_of_t : t -> Sexplib0.Sexp.t)
[@@@end]
include Poly
end
include Poly
let between t ~low ~high = low <= t && t <= high
let clamp_unchecked t ~min ~max = if t < min then min else if t <= max then t else max
let clamp_exn t ~min ~max =
assert (min <= max);
clamp_unchecked t ~min ~max
;;
let clamp t ~min ~max =
if min > max
then
Or_error.error_s
(Sexp.message
"clamp requires [min <= max]"
[ "min", T.sexp_of_t min; "max", T.sexp_of_t max ])
else Ok (clamp_unchecked t ~min ~max)
;;
module C = struct
include T
include Comparator.Make (Replace_polymorphic_compare)
end
include C
end
let gt cmp a b = cmp a b > 0
let lt cmp a b = cmp a b < 0
let geq cmp a b = cmp a b >= 0
let leq cmp a b = cmp a b <= 0
let equal cmp a b = cmp a b = 0
let not_equal cmp a b = cmp a b <> 0
let min cmp t t' = if leq cmp t t' then t else t'
let max cmp t t' = if geq cmp t t' then t else t'
module Infix (T : sig
type t [@@deriving_inline compare]
include Ppx_compare_lib.Comparable.S with type t := t
[@@@end]
end) : Infix with type t := T.t = struct
let ( > ) a b = gt T.compare a b
let ( < ) a b = lt T.compare a b
let ( >= ) a b = geq T.compare a b
let ( <= ) a b = leq T.compare a b
let ( = ) a b = equal T.compare a b
let ( <> ) a b = not_equal T.compare a b
end
[@@inline always]
module Comparisons (T : sig
type t [@@deriving_inline compare]
include Ppx_compare_lib.Comparable.S with type t := t
[@@@end]
end) : Comparisons with type t := T.t = struct
include Infix (T)
let compare = T.compare
let equal = ( = )
let min t t' = min compare t t'
let max t t' = max compare t t'
end
[@@inline always]
module Make_using_comparator (T : sig
type t [@@deriving_inline sexp_of]
val sexp_of_t : t -> Sexplib0.Sexp.t
[@@@end]
include Comparator.S with type t := t
end) : S with type t := T.t and type comparator_witness = T.comparator_witness = struct
module T = struct
include T
let compare = comparator.compare
end
include T
module Replace_polymorphic_compare = Comparisons (T)
include Replace_polymorphic_compare
let ascending = compare
let descending t t' = compare t' t
let between t ~low ~high = low <= t && t <= high
let clamp_unchecked t ~min ~max = if t < min then min else if t <= max then t else max
let clamp_exn t ~min ~max =
assert (min <= max);
clamp_unchecked t ~min ~max
;;
let clamp t ~min ~max =
if min > max
then
Or_error.error_s
(Sexp.message
"clamp requires [min <= max]"
[ "min", T.sexp_of_t min; "max", T.sexp_of_t max ])
else Ok (clamp_unchecked t ~min ~max)
;;
end
module Make (T : sig
type t [@@deriving_inline compare, sexp_of]
include Ppx_compare_lib.Comparable.S with type t := t
val sexp_of_t : t -> Sexplib0.Sexp.t
[@@@end]
end) =
Make_using_comparator [@inlined hint] (struct
include T
include Comparator.Make (T)
end)
module Inherit (C : sig
type t [@@deriving_inline compare]
include Ppx_compare_lib.Comparable.S with type t := t
[@@@end]
end) (T : sig
type t [@@deriving_inline sexp_of]
val sexp_of_t : t -> Sexplib0.Sexp.t
[@@@end]
val component : t -> C.t
end) =
Make (struct
type t = T.t [@@deriving_inline sexp_of]
let sexp_of_t = (T.sexp_of_t : t -> Sexplib0.Sexp.t)
[@@@end]
let compare t t' = C.compare (T.component t) (T.component t')
end)
let lexicographic cmps x y =
let rec loop = function
| cmp :: cmps ->
let res = cmp x y in
if res = 0 then loop cmps else res
| [] -> 0
in
loop cmps
;;
let lift cmp ~f x y = cmp (f x) (f y)
let reverse cmp x y = cmp y x
type 'a reversed = 'a
let compare_reversed cmp x y = cmp y x