Re: [Haskell-cafe] List all multiply/add combinations

Jonas Almström Duregård писал(а) в своём письме Mon, 19 Nov 2012 01:31:01 +0300:

Hi,

You can make a datatype that captures exactly the expressions you want (see code below). Essentially you want to make sure that a subtraction or addition never has another subtraction or addition as its left operand.

I would also like to advertise a bit and show how this type can be enumerated automatically by Feat ( http://hackage.haskell.org/package/testing-feat).

After a quick look, Feat seems to be awesome. Thanks! I don’t yet know how I am going to use it, but I hope an opportunity will present itself soon :)