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Library
Module
Module type
Parameter
Class
Class type
Sets over ordered types.
This module implements the set data structure, given a total ordering function over the set elements. All operations over sets are purely applicative (no side-effects). The implementation uses balanced binary trees, and is therefore reasonably efficient: insertion and membership take time logarithmic in the size of the set, for instance.
The Make functor constructs implementations for any type, given a compare function. For instance:
module IntPairs =
struct
type t = int * int
let compare (x0,y0) (x1,y1) =
match Pervasives.compare x0 x1 with
0 -> Pervasives.compare y0 y1
| c -> c
end
module PairsSet = Set.Make(IntPairs)
let m = PairsSet.(empty |> add (2,3) |> add (5,7) |> add (11,13))
This creates a new module PairsSet, with a new type PairsSet.t of sets of int * int.