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annotate demo/sum.ur @ 443:bd9ee9aeca2f
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| author | Adam Chlipala <adamc@hcoop.net> |
|---|---|
| date | Thu, 30 Oct 2008 16:58:54 -0400 |
| parents | 6a0e54400805 |
| children | f4f2b09a533a |
| 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@413 | 7 {[sum {}]}<br/> |
| adamc@412 | 8 {[sum {A = 0, B = 1}]}<br/> |
| adamc@412 | 9 {[sum {C = 2, D = 3, E = 4}]} |
| adamc@411 | 10 </body></xml> |