Re: [Haskell-cafe] When using Cereal, what is the right way to write `get` for multi-constructor type?

You may also want to use the Lambda-case extension. It will allow you to elide the declaration of i. --Will Yager On Tue, Apr 26, 2016 at 1:24 AM, Ivan Lazar Miljenovic < ivan.miljenovic@gmail.com> wrote:

On 26 April 2016 at 15:39, Magicloud Magiclouds wrote:

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Hi, Say I have code already like: data STH = A | B | C instance Serialize STH where put A = putWord8 1 put B = putWord8 66 put C = putWord8 111

Then what is the better way to do `get`? Is following the only one? get = do i <- getWord8 case i of 1 -> return A 66 -> return B 111 -> return C

I think that covers it, though having an explicit error message for any other value of `i` will probably be better than the default unmatched case one.

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Thanks.

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-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com http://IvanMiljenovic.wordpress.com _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe