From: Gabriel Scherer <gabriel.scherer@gmail.com>
To: Jean-Baptiste Jeannin <jeannin@cs.cornell.edu>
Cc: Nicholas Lucaroni <nicholas.r.lucaroni@gmail.com>,
Edgar Friendly <thelema314@gmail.com>,
"caml-list@inria.fr" <caml-list@inria.fr>
Subject: Re: [Caml-list] Hash function: complexity and circular structures
Date: Fri, 18 Jan 2013 19:27:14 +0100 [thread overview]
Message-ID: <CAPFanBGqAdTe2uujQGtxYVrj-W5Y_Ez0Xu0_fgrY2OttekYzgw@mail.gmail.com> (raw)
In-Reply-To: <50F98A81.6080902@cs.cornell.edu>
A blunt point of view: comparing implicitly circular structures is a
sure road to hell, and you should use an explicit representation of
circularity (eg. with a element that just means "nothing here, you
should rewind to the other side") that will not blow up at each
occasion it gets -- and is generally much more flexible.
On Fri, Jan 18, 2013 at 6:46 PM, Jean-Baptiste Jeannin
<jeannin@cs.cornell.edu> wrote:
>
> I would be curious to know if this is by design (it is supposed not to
> work), or if it is a problem with the implementation of compare, or of
> Hashtbl.find. In particular, if it is by design, why have updated the hash
> function to support circular lists?
> I am also now stuck on creating an (efficient) hashtable supporting circular
> data structures as keys. Any idea on this?
next prev parent reply other threads:[~2013-01-18 18:27 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-17 15:35 Jean-Baptiste Jeannin
2013-01-17 15:46 ` Nicholas Lucaroni
2013-01-17 16:41 ` Edgar Friendly
2013-01-17 17:05 ` Nicholas Lucaroni
2013-01-18 17:46 ` Jean-Baptiste Jeannin
2013-01-18 18:27 ` Gabriel Scherer [this message]
2013-01-18 20:11 ` Nick Lucaroni
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