RE: [Haskell-cafe] empty Array?

It is, of course, trivial to implement this for lists. I've run into a snag, however, when trying to implement this for Arrays (as in Data.Array) - I can't seem to find a way to represent an empty array, which makes implementing 'empty' and 'null' impossible. Suggestions?

Empty arrays can be achieved by having bounds where the lower bound is greater than the upper bound. An example would be:

empty = array (1,0) []

The function null would check the bounds to see if the lower bound is greater than the upper bound. HTH, /Josef