Re: [Haskell-cafe] Re: Scraping boilerplate deriving?

On 9/15/10 9:11 AM, Kevin Jardine wrote:

Hi Malcolm,

In this case, I am counting on GHC's

{-# LANGUAGE GeneralizedNewtypeDeriving #-}

feature to derive the instances for the classes I am including in the deriving clause.

So perhaps portability is not a big issue here in any case.

Yes, but GND is a feature that would not be terribly difficult to add to another compiler. That it is GHC-only today is only because other compilers have bigger fish to fry. Implementing TH, on the other hand, is a major undertaking and doesn't look like it will be reimplemented anytime soon. -- Live well, ~wren