From: "Daniel Bünzli" <daniel.buenzli@epfl.ch>
To: caml-list <caml-list@inria.fr>
Subject: Re: [Caml-list] type var in functor instance?
Date: Mon, 20 Sep 2004 22:15:26 +0200 [thread overview]
Message-ID: <CF335446-0B41-11D9-9976-000393DBC266@epfl.ch> (raw)
In-Reply-To: <1095694982.2580.595.camel@pelican.wigram>
Hello,
Accidentally I'm running into the same problem. I'd like to have a
polymorphic Hashtbl that uses physical equality. Using Hashtbl.Make is
not possible since the type t of the input signature HashedType has no
variable.
More precisely I would like to have a key with the following type
type 'a 'b key = 'a option * 'b option
and the following equal function,
let equal k k' = match k, k' with
| (Some x, y), (Some x', y') -> if x == x' then y = y' else false
| _, _ -> k = k'
which tests for physical equality when the first component of the key
is "Some" in both keys.
Any hints besides those already suggested ?
Daniel
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next prev parent reply other threads:[~2004-09-20 20:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1095516867.2580.211.camel@pelican.wigram>
2004-09-20 11:58 ` Jean-Christophe Filliatre
2004-09-20 15:43 ` skaller
2004-09-20 20:15 ` Daniel Bünzli [this message]
2004-09-20 20:17 ` [Caml-list] Core library (was: type var in functor instance?) Jon Harrop
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