NAME¶

Hashtbl.HashedType - The input signature of the functor Hashtbl.Make.

Module type¶

Module type Hashtbl.HashedType

Documentation¶

Module type HashedType
= sig end

The input signature of the functor Hashtbl.Make .

type t

The type of the hashtable keys.

val equal : t -> t -> bool

The equality predicate used to compare keys.

val hash : t -> int

A hashing function on keys. It must be such that if two keys are equal according to equal , then they have identical hash values as computed by hash . Examples: suitable ( equal , hash ) pairs for arbitrary key types include ( (=) , Hashtbl.hash ) for comparing objects by structure, ( (fun x y -> compare x y = 0) , Hashtbl.hash ) for comparing objects by structure and handling Pervasives.nan correctly, and ( (==) , Hashtbl.hash ) for comparing objects by addresses (e.g. for cyclic keys).