# The SML/NJ Library Reference Manual

### The `HASH_KEY` signature

#### Synopsis

> `signature `HASH_KEY`
> `

#### Interface

> `type hash_key
> val hashVal : hash_key -> word
> val sameKey : (hash_key * hash_key) -> bool
> `

#### Description

`type hash_key`
`hashVal hk`
  explain the use and semantics of hashVal HERE.
`sameKey (hk, hk2)`
  explain the use and semantics of sameKey HERE.

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Last Modified May 29, 1996
Copyright © 1996 AT&T Research