Re: [Haskell-cafe] Num instances for 2-dimensional types

Soenke Hahn schrieb:

If you want to use number literals, you have to implement an instance for Algebra.Ring.C, if i understand correctly. Is there any special reason, why fromInteger is a method of Algebra.Ring.C?

Yes, Ring is the most basic class in the hierarchy that provides a zero, a one and addition, thus you could implement fromInteger by successively adding or subtracting one from zero, given some basic operations on Integer. 'fromInteger' just allows a more efficient implementation.