[Haskell-cafe] Data declaration vs type classes

Imants Cekusins imantc at gmail.com
Fri Jan 8 11:26:45 UTC 2016

> it's very hard to pass them around, manipulate them and compute with them without using non-standard and awkward techniques.

well here is one simple use case when class is very convenient:

class ConvertByteString a where
  toByteString::a -> ByteString
  fromByteString::ByteString -> a

no problems defining instances of this class, passing and calling them

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