diff options
author | Stephane Glondu <steph@glondu.net> | 2012-01-12 16:04:54 +0100 |
---|---|---|
committer | Stephane Glondu <steph@glondu.net> | 2012-01-12 16:04:54 +0100 |
commit | 39efc41237ec906226a3a53d7396d51173495204 (patch) | |
tree | 87cd58d72d43469d2a2a0a127c1060d7c9e0206b /lib/hashtbl_alt.mli | |
parent | 5fe4ac437bed43547b3695664974f492b55cb553 (diff) | |
parent | 97fefe1fcca363a1317e066e7f4b99b9c1e9987b (diff) |
Remove non-DFSG contentsupstream/8.4_beta+dfsg
Diffstat (limited to 'lib/hashtbl_alt.mli')
-rw-r--r-- | lib/hashtbl_alt.mli | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/lib/hashtbl_alt.mli b/lib/hashtbl_alt.mli new file mode 100644 index 00000000..a22dbc28 --- /dev/null +++ b/lib/hashtbl_alt.mli @@ -0,0 +1,41 @@ +(************************************************************************) +(* v * The Coq Proof Assistant / The Coq Development Team *) +(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2010 *) +(* \VV/ **************************************************************) +(* // * This file is distributed under the terms of the *) +(* * GNU Lesser General Public License Version 2.1 *) +(************************************************************************) + +(* The following module is a specialized version of [Hashtbl] that is + a better space saver. Actually, [Hashcons] instanciates [Hashtbl.t] + with [constr] used both as a key and as an image. Thus, in each + cell of the internal bucketlist, there are two representations of + the same value. In this implementation, there is only one. + + Besides, the responsibility of computing the hash function is now + given to the caller, which makes possible the interleaving of the + hash key computation and the hash-consing. *) + +module type Hashtype = sig + type t + val equals : t -> t -> bool +end + +module type S = sig + type elt + (* [may_add_and_get key constr] uses [key] to look for [constr] + in the hash table [H]. If [constr] is in [H], returns the + specific representation that is stored in [H]. Otherwise, + [constr] is stored in [H] and will be used as the canonical + representation of this value in the future. *) + val may_add_and_get : int -> elt -> elt +end + +module Make (E : Hashtype) : S with type elt = E.t + +module Combine : sig + val combine : int -> int -> int + val combinesmall : int -> int -> int + val combine3 : int -> int -> int -> int + val combine4 : int -> int -> int -> int -> int +end |