annotate src/multimap_fn.sml @ 2263:dfadb5effdc0
Merge bbaren's fix for bug 209.
| author |
Ziv Scully <ziv@mit.edu> |
| date |
Tue, 13 Oct 2015 14:22:05 -0400 |
| parents |
365727ff68f4 |
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| rev |
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 itemSet = ValSet.set
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5 type multimap = ValSet.set KeyMap.map
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6 val empty : multimap = KeyMap.empty
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7 fun insertSet (kToVs : multimap, k : key, vs : itemSet) : multimap =
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8 KeyMap.unionWith ValSet.union (kToVs, KeyMap.singleton (k, vs))
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9 fun insert (kToVs : multimap, k : key, v : item) : multimap =
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10 insertSet (kToVs, k, ValSet.singleton v)
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11 fun findSet (kToVs : multimap, k : key) =
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12 case KeyMap.find (kToVs, k) of
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13 SOME vs => vs
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14 | NONE => ValSet.empty
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15 val findList : multimap * key -> item list = ValSet.listItems o findSet
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16 end
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