Ur/Web: demo/sum.ur annotate

Infering sum rows

author	Adam Chlipala <adamc@hcoop.net>
date	Tue, 21 Oct 2008 19:31:11 -0400
parents	06fcddcd20d3
children	6a0e54400805

rev	line source
adamc@412	1 fun sum (fs ::: {Unit}) (x : $(mapUT int fs)) =
adamc@411	2 foldUR [int] [fn _ => int]
adamc@411	3 (fn (nm :: Name) (rest :: {Unit}) [[nm] ~ rest] n acc => n + acc)
adamc@411	4 0 [fs] x
adamc@411	5
adamc@411	6 fun main () = return <xml><body>
adamc@412	7 {[sum {A = 0, B = 1}]}<br/>
adamc@412	8 {[sum {C = 2, D = 3, E = 4}]}
adamc@411	9 </body></xml>

Mercurial > urweb