How to override a type class instance ?

Johannes Joachim Engels

18 Oct 2014 18 Oct '14

3:32 p.m.

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Nadir Sampaoli

18 Oct 18 Oct

5:30 p.m.

Hi,

...

say, I am not happy with the Show instances of arrays, e.g.

You usually wrap the data type in a newtype and use GeneralizedNewtypeDeriving to derive the classes you want to keep. Then write custom instances for the type classes you want to override.

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Johannes Joachim Engels
Nadir Sampaoli

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