A reasonable analogy (though it's not nearly the same thing) for Haskell classes is Java interfaces. e.g. in Java, Boolean is a class that implements Serializable and Comparable, while Haskell's Bool type is an instance of all those classes you listed. In Haskell, the equivalent of Java's 'class Boolean implements Comparable<Boolean> ...' is 'instance Eq Bool where ... '. In Java you declare the interfaces that a class implements when the class is declared. In Haskell, you can add class instances to any type later, not just in the module that declared the type. Peter 2011/12/30 Stanisław Findeisen :

Hi

What are those basic data type instances? For example here: http://www.haskell.org/ghc/docs/latest/html/libraries/base/Prelude.html#t:Bo... we have:

Instances

Bounded Bool Enum Bool Eq Bool Data Bool Ord Bool Read Bool Show Bool Ix Bool Typeable Bool Generic Bool Storable Bool

What is the difference between, e.g., Bounded Bool and Enum Bool?

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