On Thu, May 31, 2007 at 08:47:28PM +0100, Andrew Coppin wrote:

My first instinct was to use Data.Bits - but I see no instance for Double. (Presumably because performing bitwise operations on a Double is a pretty odd thing to want to do.) So my next guess is to do some bizzare type system hackery that allows you to transform a Double into... whichever integer type is the same size, and proceed from there. Does anybody know how to do that?

This reminds me. it would be nice if we could remove the 'Num' superclass of Bits, having bitwise operations and being a number are fairly unrelated and having to declare bogus instances is annoying. It is probably just a holdover from C that we think of them as related. 'Bool' would be a simple example of something that is a good instance of bits, but not Num. John -- John Meacham - ⑆repetae.net⑆john⑈