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  1. {-# LANGUAGE MultiParamTypeClasses, FlexibleInstances, CPP #-}
  2. import Data.Time
  3.  
  4. #define as ::
  5.  
  6. class Cast a c where
  7.   cast :: a -> c
  8.  
  9. instance Show a => Cast a [Char] where
  10.   cast = show
  11.  
  12. instance Cast UTCTime Day where
  13.   cast = utctDay
  14.  
  15. main = do
  16.     now <- getCurrentTime
  17.     print (cast now as String)
  18.     print (cast now as Day)
  19.     print (cast (cast now as Day) as String)
Success #stdin #stdout 0s 6312KB
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"2014-11-20 18:25:28.693383 UTC"
2014-11-20
"2014-11-20"
https://ideone.com/hTlmrM
language:
Haskell (ghc 8.4.4)
created:
11 years ago
visibility:
public

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