Dear All.

I'd like to compare fields of each record.

here is my record.

data Person = Person {name:: String, age:: Int } deriving(Show)

data Relations = Friend | Older | Younger

class Comparison a where

    compare:: a -> a -> Relations

instance Comparison Person where

    compare Person a b Person a b

         | b1 == b2 = Friend

         | b1 > b2 = Older

         | b1 < b2 = Younger

How can I fit it?

Sincerely,

 

Jeon-Young Kang

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