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Man Pages


Manual Reference Pages  -  HASHTBL.HASHEDTYPE (3)

NAME

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

CONTENTS

Module type
Documentation

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 (provided objects do not contain floats)

- ( (fun x y -> compare x y = 0) , Hashtbl.hash ) for comparing objects by structure and handling Pervasives.nan correctly

- ( (==) , Hashtbl.hash ) for comparing objects by physical equality (e.g. for mutable or cyclic objects).

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OCamldoc HASHTBL.HASHEDTYPE (3) 2016-03-17

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