Mercurial > urweb
annotate src/multimap_fn.sml @ 2226:e10881cd92da
Merge.
| author | Ziv Scully <ziv@mit.edu> |
|---|---|
| date | Fri, 27 Mar 2015 11:26:06 -0400 |
| parents | 365727ff68f4 |
| children |
| rev | line source |
|---|---|
| ziv@2203 | 1 functor MultimapFn (structure KeyMap : ORD_MAP structure ValSet : ORD_SET) = struct |
| ziv@2203 | 2 type key = KeyMap.Key.ord_key |
| ziv@2203 | 3 type item = ValSet.item |
| ziv@2213 | 4 type itemSet = ValSet.set |
| ziv@2203 | 5 type multimap = ValSet.set KeyMap.map |
| ziv@2213 | 6 val empty : multimap = KeyMap.empty |
| ziv@2213 | 7 fun insertSet (kToVs : multimap, k : key, vs : itemSet) : multimap = |
| ziv@2203 | 8 KeyMap.unionWith ValSet.union (kToVs, KeyMap.singleton (k, vs)) |
| ziv@2203 | 9 fun insert (kToVs : multimap, k : key, v : item) : multimap = |
| ziv@2213 | 10 insertSet (kToVs, k, ValSet.singleton v) |
| ziv@2213 | 11 fun findSet (kToVs : multimap, k : key) = |
| ziv@2203 | 12 case KeyMap.find (kToVs, k) of |
| ziv@2203 | 13 SOME vs => vs |
| ziv@2203 | 14 | NONE => ValSet.empty |
| ziv@2213 | 15 val findList : multimap * key -> item list = ValSet.listItems o findSet |
| ziv@2203 | 16 end |