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comparison demo/sum.ur @ 411:06fcddcd20d3

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Sum demo, minus inference of {Unit}s
author Adam Chlipala <adamc@hcoop.net>
date Tue, 21 Oct 2008 19:24:39 -0400
parents
children df4cbd90a26e
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410:c5a3d223f157 411:06fcddcd20d3
1 fun sum (fs :: {Unit}) (x : $(mapUT int fs)) =
2 foldUR [int] [fn _ => int]
3 (fn (nm :: Name) (rest :: {Unit}) [[nm] ~ rest] n acc => n + acc)
4 0 [fs] x
5
6 fun main () = return <xml><body>
7 {[sum [[A, B]] {A = 0, B = 1}]}<br/>
8 {[sum [[C, D, E]] {C = 2, D = 3, E = 4}]}
9 </body></xml>