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.