annotate demo/sum.ur @ 627:f4f2b09a533a
demo/sum working with manual folders
| author |
Adam Chlipala <adamc@hcoop.net> |
| date |
Sun, 22 Feb 2009 17:39:55 -0500 |
| parents |
6a0e54400805 |
| children |
effa7d43aac3 |
| rev |
line source |
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adamc@627
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1 fun sum (fs ::: {Unit}) (fold : folder fs) (x : $(mapUT int fs)) =
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adamc@411
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2 foldUR [int] [fn _ => int]
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adamc@411
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3 (fn (nm :: Name) (rest :: {Unit}) [[nm] ~ rest] n acc => n + acc)
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adamc@627
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4 0 [fs] fold x
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adamc@411
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5
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adamc@411
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6 fun main () = return <xml><body>
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adamc@627
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7 {[sum Folder.nil {}]}<br/>
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adamc@627
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8 {[sum (Folder.cons [#A] [()] (Folder.cons [#B] [()] Folder.nil)) {A = 0, B = 1}]}<br/>
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adamc@627
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9 {[sum (Folder.cons [#D] [()] (Folder.cons [#C] [()] (Folder.cons [#E] [()] Folder.nil))) {C = 2, D = 3, E = 4}]}
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adamc@411
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10 </body></xml>
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