Ur/Web: demo/tcSum.ur annotate

RPC returning an option

author	Adam Chlipala <adamc@hcoop.net>
date	Sun, 08 Mar 2009 13:41:55 -0400
parents	03ab853c8e4b
children	aa2290c32ce2

rev	line source
adamc@632	1 fun sum (t ::: Type) (_ : num t) (fs ::: {Unit}) (fl : folder fs) (x : $(mapUT t fs)) =
adamc@417	2 foldUR [t] [fn _ => t]
adamc@417	3 (fn (nm :: Name) (rest :: {Unit}) [[nm] ~ rest] n acc => n + acc)
adamc@632	4 zero [fs] fl x
adamc@417	5
adamc@417	6 fun main () = return <xml><body>
adamc@633	7 {[sum {A = 0, B = 1}]}<br/>
adamc@633	8 {[sum {C = 2.1, D = 3.2, E = 4.3}]}
adamc@417	9 </body></xml>

Mercurial > urweb