annotate demo/sum.ur @ 712:915ec60592d4

More flexible foreign keying
author Adam Chlipala <adamc@hcoop.net>
date Thu, 09 Apr 2009 13:59:34 -0400
parents aa2290c32ce2
children 669ac5e9a69e
rev   line source
adamc@643 1 fun sum (fs ::: {Unit}) (fl : folder fs) (x : $(mapU int fs)) =
adamc@411 2 foldUR [int] [fn _ => int]
adamc@411 3 (fn (nm :: Name) (rest :: {Unit}) [[nm] ~ rest] n acc => n + acc)
adamc@632 4 0 [fs] fl x
adamc@411 5
adamc@411 6 fun main () = return <xml><body>
adamc@633 7 {[sum {}]}<br/>
adamc@633 8 {[sum {A = 0, B = 1}]}<br/>
adamc@633 9 {[sum {C = 2, D = 3, E = 4}]}
adamc@411 10 </body></xml>