{-# LANGUAGE CPP  #-}

-- | More monoids.

module Agda.Utils.Monoid where

#if !(MIN_VERSION_base(4,11,0))
import Data.Semigroup (Semigroup(..))
#endif


-- | Maximum of on-negative (small) natural numbers.

newtype MaxNat = MaxNat { MaxNat -> Int
getMaxNat :: Int }
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instance Semigroup MaxNat where
  <> :: MaxNat -> MaxNat -> MaxNat
(<>) = MaxNat -> MaxNat -> MaxNat
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max

instance Monoid MaxNat where
  mempty :: MaxNat
mempty     = MaxNat
0
#if !(MIN_VERSION_base(4,11,0))
  mappend    = (<>)
#endif
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0
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