Am Donnerstag, 7. Februar 2008 15:56 schrieben Sie:
Don't expect anything astonishing yet, but an initial version of the library can be found at
http:/code.haskell.org/type-level
To make reviewing easier I have put the haddock-generated documentation at
Thanks for your effort. From a quick look at the Haddock documentation, some questions/remarks arised. Nat means “all natural numbers except zero” while Nat0 means “all natural numbers (including zero)”. Since in computer science, natural numbers usually cover zero, we should use Pos instead of Nat and Nat instead of Nat0. You seem to write 12 as 1 :+ 2 instead of () :+ 1 :+ 2. But I think, the latter representation should probably be prefered. With it, :+ always has a number as its left argument and a digit as its right. Without the () :+ we get ugly exceptional cases. You can see this, for example, in the instance declarations for Compare. With the second representation, we could reduce the number of instances dramatically. We would define a comparison of digits (verbose) and than a comparison of numbers based on the digit comparison (not verbose). :+ is already used as the constructor for complex numbers. We should probably use some different operator. Again, thanks for your work.
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Best wishes, Wolfgang