Map(3)

NAME
Map - Association tables over ordered types.

Module
Module Map

Documentation

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 =
           struct
             type t = int * int
             let compare (x0,y0) (x1,y1) =
               match Stdlib.compare x0 x1 with
                   0 -> Stdlib.compare y0 y1
                 | c -> c
           end

         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.