From: Francois Pottier <francois.pottier@inria.fr>
To: Michael Vanier <mvanier@cs.caltech.edu>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] a design problem requiring downcasting? (long)
Date: Fri, 27 Sep 2002 09:20:23 +0200 [thread overview]
Message-ID: <20020927092023.A32079@pauillac.inria.fr> (raw)
In-Reply-To: <200209260901.g8Q910t03459@orchestra.cs.caltech.edu>; from mvanier@cs.caltech.edu on Thu, Sep 26, 2002 at 02:01:00AM -0700
Hi,
> With alternative (1), to do the method call above you would need downcasting
> e.g. in pseudo-ocaml:
>
> let obj1 = array.(0) as class1 in
> let obj2 = array.(1) as class2 in
> obj1#my_method obj2
>
> with the cast raising an exception if it fails. No problem.
There is something you haven't explained here. How, given the array
indices 0 and 1, do you know that the appropriate classes are class1
and class2? How do map from an index back to the expected class? If
we knew this, perhaps we would able to give better advice.
--
François Pottier
Francois.Pottier@inria.fr
http://pauillac.inria.fr/~fpottier/
-------------------
To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr
Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/
Beginner's list: http://groups.yahoo.com/group/ocaml_beginners
next prev parent reply other threads:[~2002-09-27 7:20 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-26 9:01 Michael Vanier
2002-09-26 14:32 ` Remi VANICAT
2002-09-26 15:19 ` nadji
2002-09-26 15:27 ` Remi VANICAT
2002-09-26 15:55 ` nadji
2002-09-26 15:53 ` Jeffrey Palmer
2002-09-26 16:35 ` Oleg
2002-09-26 17:47 ` brogoff
2002-09-26 19:14 ` Fred Smith
2002-09-27 17:01 ` Tim Freeman
2002-09-26 22:46 ` Alessandro Baretta
2002-09-27 7:20 ` Francois Pottier [this message]
2002-09-27 10:16 ` Michael Vanier
2002-09-29 22:59 ` Alessandro Baretta
2002-09-30 7:09 ` Michael Vanier
2002-09-30 9:54 ` Alessandro Baretta
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20020927092023.A32079@pauillac.inria.fr \
--to=francois.pottier@inria.fr \
--cc=caml-list@inria.fr \
--cc=mvanier@cs.caltech.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).