Mercurial > urweb
view demo/tcSum.ur @ 783:ec0a0dd0ca12
Revising manual through end of Section 3
author | Adam Chlipala <adamc@hcoop.net> |
---|---|
date | Tue, 05 May 2009 11:45:03 -0400 |
parents | aa2290c32ce2 |
children | 669ac5e9a69e |
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fun sum (t ::: Type) (_ : 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 [fs] 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>