Re: [Haskell-cafe] Why is Bool no instance of Num and Bits?

Deniz Dogan wrote:

...

instance Num Bool where (+) False = id (+) True = not

(*) True True = True (*) _ _ = False

Isn't "XOR" for booleans (/=)?

Oh right. And (*) would be (&&): instance Num Bool where (+) = (/=) (*) = (&&) -- ... //Stephan -- Früher hieß es ja: Ich denke, also bin ich. Heute weiß man: Es geht auch so. - Dieter Nuhr