MoreLabels.Hashtbl.HashedType(3) OCaml library MoreLabels.Hashtbl.HashedType(3)

# [NAME](#NAME)

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

# [Module type](#Module_type)

Module type MoreLabels.Hashtbl.HashedType

# [Documentation](#Documentation)

Module type **HashedType**  
\= **sig end**

The input signature of the functor **MoreLabels.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

\- ( **(=)** , **MoreLabels.Hashtbl.HashedType.hash** ) for comparing objects by structure (provided objects do not contain floats)

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

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

2026-09-15 OCamldoc

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Document: MoreLabels.Hashtbl.HashedType(3o) from ocaml-4 4.14.4-r3 (Chainguard OS)
Source: https://github.com/ocaml/ocaml