1Map(3)                           OCaml library                          Map(3)
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NAME

6       Map - Association tables over ordered types.
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Module

9       Module   Map
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Documentation

12       Module Map
13        : sig end
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16       Association tables over ordered types.
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18       This  module  implements  applicative association tables, also known as
19       finite maps or dictionaries, given a total ordering function  over  the
20       keys.   All  operations  over  maps are purely applicative (no side-ef‐
21       fects).  The implementation uses balanced binary trees,  and  therefore
22       searching and insertion take time logarithmic in the size of the map.
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24       For instance:
25            module IntPairs =
26              struct
27                type t = int * int
28                let compare (x0,y0) (x1,y1) =
29                  match Stdlib.compare x0 x1 with
30                      0 -> Stdlib.compare y0 y1
31                    | c -> c
32              end
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34            module PairsMap = Map.Make(IntPairs)
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36            let m = PairsMap.(empty |> add (0,1) "hello" |> add (1,0) "world")
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39       This  creates  a new module PairsMap , with a new type 'a PairsMap.t of
40       maps from int * int to 'a . In this example, m contains  string  values
41       so its type is string PairsMap.t .
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47       module type OrderedType = sig end
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50       Input signature of the functor Map.Make .
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53       module type S = sig end
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56       Output signature of the functor Map.Make .
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59       module Make : functor (Ord : OrderedType) -> sig end
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62       Functor building an implementation of the map structure given a totally
63       ordered type.
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69OCamldoc                          2023-01-23                            Map(3)