Source file type_polarity.ml

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type t = Positive | Negative

let positive = Positive
let negative = Negative

let negate = function
  | Positive -> Negative
  | Negative -> Positive

let to_string = function
  | Negative -> "negative"
  | Positive -> "positive"

let compare a b =
  match (a, b) with
  | Negative, Positive -> -1
  | Positive, Negative -> 1
  | Positive, Positive | Negative, Negative -> 0

let equal a b = Int.equal 0 (compare a b)