Fungi-1.0: Data/IntegralLike.hs

module Data.IntegralLike (
    IntegralLike (..)
  ) where

import Data.Char (ord)

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class IntegralLike a where
  asIntegral :: (Integral i) => a -> i

instance IntegralLike Bool where
  asIntegral False = 0
  asIntegral True = 1

instance IntegralLike Char where
  asIntegral = fromIntegral . ord

instance IntegralLike Int where
  asIntegral = fromIntegral

instance IntegralLike Integer where
  asIntegral = fromInteger