Am 27.12.2010 08:44, schrieb Henning Thielemann:
On Mon, 27 Dec 2010, Jonathan Geddes wrote:
#1 Parse a string at compile-time so that a custom syntax for representing data can be used. At the extreme, this "data" might even be an EDSL.
I think it would be enough, if the compiler could be told to unfold an expression like parse "text in a domain specific language" at compile time.
#2 Provide instances automatically.
http://www.haskell.org/ghc/docs/7.0-latest/html/users_guide/generic-classes....
I see the text below and have no idea where the package lang or the module Generic comes from. Can someone enlighten me? I didn't find package lang on hackage. Cheers Christian 7.16.1. Using generics To use generics you need to * Use the flags -fglasgow-exts (to enable the extra syntax), -XGenerics (to generate extra per-data-type code), and -package lang (to make the Generics library available. * Import the module Generics from the lang package. This import brings into scope the data types Unit, :*:, and :+:. (You don't need this import if you don't mention these types explicitly; for example, if you are simply giving instance declarations.)