[Haskell-cafe] Closed Classes

ajb at spamcop.net ajb at spamcop.net
Thu Aug 12 22:33:25 EDT 2004

G'day all.

Quoting camarao at dcc.ufmg.br:

> Informally, what I see as the defining rule for "closed world" is: "an
> expression is typed according to the set of definitions that are
> visible in the context in which it is used".  Other possibilities
> exist, but the nice thing about this is that it is an extension of
> what happens without overloading.

Except that you can choose to export or not export a non-overloaded
function from a module, but you don't have that choice with typeclass

Andrew Bromage

More information about the Haskell-Cafe mailing list