45 lines
1.1 KiB
OCaml
45 lines
1.1 KiB
OCaml
(* Polymorphic maps *)
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module RB = RedBlack
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type ('key, 'value) t = {
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tree : ('key * 'value) RB.t;
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cmp : 'key -> 'key -> int
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}
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type ('key, 'value) map = ('key, 'value) t
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let create ~cmp = {tree = RB.empty; cmp}
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let empty map = {tree = RB.empty; cmp=map.cmp}
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let is_empty map = RB.is_empty map.tree
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let add key value map =
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let cmp (k1,_) (k2,_) = map.cmp k1 k2 in
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{map with tree = RB.add ~cmp RB.New (key, value) map.tree}
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let remove key map =
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let cmp k1 (k2,_) = map.cmp k1 k2 in
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{map with tree = RB.remove ~cmp key map.tree}
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let find key map =
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let cmp k1 (k2,_) = map.cmp k1 k2 in
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try snd (RB.find ~cmp key map.tree) with
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Not_found -> raise Not_found
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let find_opt key map =
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try Some (find key map) with Not_found -> None
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let update key updater map =
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match updater (find_opt key map) with
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| None -> remove key map
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| Some v -> add key v map
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let bindings map =
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RB.fold_dec (fun ~elt ~acc -> elt::acc) ~init:[] map.tree
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let iter f map = RB.iter (fun (k,v) -> f k v) map.tree
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let fold_inc f map = RB.fold_inc (fun ~elt:(k,v) -> f k v) map.tree
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