annotate src/multimap_fn.sml @ 2203:39faa4a037f4
ML half of initial prototype. (Doesn't compile because there's no C yet.)
| author |
Ziv Scully <ziv@mit.edu> |
| date |
Tue, 25 Mar 2014 02:04:06 -0400 |
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365727ff68f4 |
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line source |
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1 functor MultimapFn (structure KeyMap : ORD_MAP structure ValSet : ORD_SET) = struct
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2 type key = KeyMap.Key.ord_key
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3 type item = ValSet.item
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4 type items = ValSet.set
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5 type multimap = ValSet.set KeyMap.map
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6 fun inserts (kToVs : multimap, k : key, vs : items) : multimap =
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7 KeyMap.unionWith ValSet.union (kToVs, KeyMap.singleton (k, vs))
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8 fun insert (kToVs : multimap, k : key, v : item) : multimap =
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9 inserts (kToVs, k, ValSet.singleton v)
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10 fun find (kToVs : multimap, k : key) =
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11 case KeyMap.find (kToVs, k) of
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12 SOME vs => vs
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13 | NONE => ValSet.empty
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14 end
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