[Haskell-cafe] deriving

Conal Elliott conal at conal.net
Mon Apr 7 12:25:32 EDT 2008

I'm not getting it.  Are you thinking that Bool itself "is derived form
these classes", rather than those four instances for Bool?  - Conal

On Mon, Apr 7, 2008 at 9:12 AM, PR Stanley <prstanley at ntlworld.com> wrote:

> Hi
> data Bool = False | True
>  deriving (Eq, Or, Show, Read)
> Bool is an instance of Eq, Ord, Show and Read. It is derived form these
> classes. If that is the meaning of the keyword deriving then wouldn't a
> different keyword such as from or derivative or even derivation be closer to
> the semantics of the concept?
> Discuss :-)
> Cheers,
> Paul
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