/ppx_deriving_hash

[@@deriving hash]

Primary LanguageOCamlMIT LicenseMIT

ppx_deriving_hash

[@@deriving hash]

ci workflow status GitHub release status opam package status

Deriver for standard hash functions without extra dependencies.

Installation

opam install ppx_deriving_hash

Usage

In dune:

(preprocess (pps ppx_deriving_hash))

Syntax

  • Use [@@deriving hash] after a type definition to derive the function val hash: t -> int for it (if the type is named t) or val ty_hash: ty -> int (otherwise if the type is named ty).
  • Use [@hash fun x -> ...] after a type expression to override the underlying hash function used for it.
  • Use [%hash: ty] as an expression for the hash function of type ty.