Mercurial > urweb
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> |