[Haskell-cafe] Data constructor synonyms
Roel van Dijk
vandijk.roel at gmail.com
Fri Mar 18 12:22:23 CET 2011
Remember that constructors are functions, except that you can't
pattern match against them.
> data MyType = GeneralConstructor [Double]
> -- GeneralConstructor :: [Double] -> MyType
Note the lower case character, just a plain function:
> specialConstructor :: Double -> MyType
> specialConstructor a = GeneralConstructor (a:)
> zero :: MyType
> zero = GeneralConstructor 
The downside is that you can't pattern-match against these functions.
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