{-# language CPP #-}
---------------------------------------------------------------------------------
-- |
-- Copyright :  (c) Edward Kmett 2017-2018
-- License   :  BSD2
-- Maintainer:  Edward Kmett <ekmett@gmail.com>
-- Stability :  experimental
-- Portability: non-portable
--
---------------------------------------------------------------------------------

signature Delta
  ( Delta
  ) where

import Data.Data
import Data.Default
import Data.Hashable
#if __GLASGOW_HASKELL__ < 804
import Data.Semigroup
#endif
import GHC.Generics

data Delta
instance Eq Delta
instance Ord Delta
instance Data Delta
instance Generic Delta
instance Num Delta -- hackishly used with (+) (-) as a group for now
instance Show Delta
instance Read Delta
instance Hashable Delta
instance Default Delta
instance Semigroup Delta
instance Monoid Delta