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32 lines
483 B
OCaml
32 lines
483 B
OCaml
type t =
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| Pos
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| Neg
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let of_nperm nperm =
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if (nperm land 1) = 1 then Neg
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else Pos
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let to_nperm = function
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| Pos -> 0
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| Neg -> 1
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let add t t' =
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match t, t' with
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| Pos, Pos
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| Neg, Neg -> Pos
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| Pos, Neg
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| Neg, Pos -> Neg
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let neg = function
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| Pos -> Neg
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| Neg -> Pos
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let add_nperm phase = function
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| 0 -> phase
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| nperm -> add phase (of_nperm nperm)
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let pp ppf = function
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| Pos -> Format.fprintf ppf "@[<h>+1@]"
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| Neg -> Format.fprintf ppf "@[<h>-1@]"
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