annotate demo/tcSum.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 (t ::: Type) (_ : num t) (fs ::: {Unit}) (fl : folder fs) (x : $(mapU 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>