deriving (was Re: storing to a file)
Andrew J Bromage
Fri, 15 Nov 2002 09:51:21 +1100
On Thu, Nov 14, 2002 at 09:56:24AM -0500, Mark Carroll wrote:
> Actually, "deriving binary" would be a nice
> thing to have in general - even more, a way to add your own "deriving"
> things from within Haskell, although I have no idea how such a thing would
Actually, there's one situation where it would work easily, and that
is when used with newtype. Apart from "Show" and "Read", which are
special cases anyway, the "deriving" operation on newtype has a simple
meaning: inherit instances from the type being wrapped.