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Map(3o) OCaml library Map(3o)


Map - Association tables over ordered types.


Module Map


Module Map
: sig end

Association tables over ordered types.

This module implements applicative association tables, also known as finite maps or dictionaries, given a total ordering function over the keys. All operations over maps are purely applicative (no side-effects). The implementation uses balanced binary trees, and therefore searching and insertion take time logarithmic in the size of the map.

For instance:

module IntPairs =
type t = int * int
let compare (x0,y0) (x1,y1) =
match x0 x1 with
0 -> y0 y1
| c -> c

module PairsMap = Map.Make(IntPairs)

let m = PairsMap.(empty |> add (0,1) "hello" |> add (1,0) "world")

This creates a new module PairsMap , with a new type 'a PairsMap.t of maps from int * int to 'a . In this example, m contains string values so its type is string PairsMap.t .

module type OrderedType = sig end

Input signature of the functor Map.Make .

module type S = sig end

Output signature of the functor Map.Make .

module Make : functor (Ord : OrderedType) -> sig end

Functor building an implementation of the map structure given a totally ordered type.

2023-09-18 OCamldoc