Mercurial > urweb

view demo/tcSum.ur @ 1611:217384f4b8ea

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Tweak error message about Basis.get to use that name instead of internal name
author Adam Chlipala <adam@chlipala.net>
date Thu, 24 Nov 2011 11:56:05 -0500
parents 8d3aa6c7cee0
children
line wrap: on
line source
fun sum [t] (_ : num t) [fs ::: {Unit}] (fl : folder fs) (x : $(mapU t fs)) =
    @foldUR [t] [fn _ => t]
     (fn [nm :: Name] [rest :: {Unit}] [[nm] ~ rest] n acc => n + acc)
     zero fl x

fun main () = return <xml><body>
  {[sum {A = 0, B = 1}]}<br/>
  {[sum {C = 2.1, D = 3.2, E = 4.3}]}
</body></xml>