From: Alain Frisch <alain@frisch.fr>
To: Leo P White <lpw25@cam.ac.uk>
Cc: Gabriel Scherer <gabriel.scherer@gmail.com>, caml <caml-list@inria.fr>
Subject: Re: [Caml-list] [ANN] ocamlopen 1.0.2
Date: Thu, 12 Apr 2012 19:21:09 +0200 [thread overview]
Message-ID: <4F870F05.5010903@frisch.fr> (raw)
In-Reply-To: <Prayer.1.3.4.1204121807300.29470@hermes-2.csi.cam.ac.uk>
On 04/12/2012 07:07 PM, Leo P White wrote:
> Just like exceptions, they are represented as constructors whose first
> field points to an address that is allocated by the extension definition
> to represent that extension. They have a special tag value so that
> structural equality knows to compare the first fields by address. Note
> that this is exactly what is required to fix the bug with structural
> equality on exceptions (4765).
Do we really need a new special tag? Why not use Object_tag and
represent slots as blocks of size 2 (constructor name + unique integer
as the second field)? This would have the following consequences (which
are the expected ones):
- The generic equality function compares the unique ids.
- The generic hash function returns the unique id.
- The generic unmarshaling function allocates a fresh id when
umarshaling such a block.
Alain
next prev parent reply other threads:[~2012-04-12 17:21 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-11 21:13 Leo P White
2012-04-12 12:56 ` Gabriel Scherer
2012-04-12 14:03 ` Alain Frisch
2012-04-12 14:16 ` Philippe Veber
2012-04-12 14:29 ` Alain Frisch
2012-04-17 10:02 ` Philippe Veber
2012-04-12 17:07 ` Leo P White
2012-04-12 17:21 ` Alain Frisch [this message]
2012-04-12 20:31 ` Leo P White
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