lib/Hcompta/Lib/Strict.hs

   1 {-# LANGUAGE DeriveDataTypeable #-}
   2 {-# OPTIONS_GHC -fno-warn-orphans #-}
   3 module Hcompta.Lib.Strict where
   4
   5 import Control.DeepSeq (NFData(..))
   6 import Data.Data
   7 import Data.Eq (Eq)
   8 import Data.Function ((.))
   9 import Data.Monoid (Monoid(..))
  10 import Data.NonNull (NonNull, toNullable)
  11 import Prelude (seq)
  12 import Text.Show (Show)
  13
  14 instance NFData s => NFData (NonNull s) where
  15         rnf = rnf . toNullable
  16
  17 -- * Type 'Clusive'
  18 -- A data type to calculate an 'inclusive' value
  19 -- (through some propagation mecanism,
  20 -- eg. incorporating the values of the children of a tree node),
  21 -- while keeping the original 'exclusive' value
  22 -- (eg. the original value of a tree node).
  23 data Clusive a
  24  =   Clusive
  25  { exclusive :: !a
  26  , inclusive :: !a
  27  } deriving (Data, Eq, Show, Typeable)
  28 instance Monoid a => Monoid (Clusive a) where
  29         mempty = Clusive mempty mempty
  30         mappend (Clusive e0 i0) (Clusive e1 i1) =
  31                 Clusive (e0`mappend`e1) (i0`mappend`i1)
  32 instance NFData a => NFData (Clusive a) where
  33         rnf (Clusive e i)  = rnf e `seq` rnf i