caml-list - the Caml user's mailing list
 help / color / mirror / Atom feed
From: Alessandro Baretta <alex@baretta.com>
To: Laurent Vibert <lvibert@irisa.fr>, Ocaml <caml-list@inria.fr>
Subject: Re: [Caml-list] Recovering masked methods
Date: Tue, 16 Jul 2002 12:10:54 +0200	[thread overview]
Message-ID: <3D33F12E.9090006@baretta.com> (raw)
In-Reply-To: <Pine.LNX.4.21.0207161144410.27236-100000@paros.irisa.fr>



Laurent Vibert wrote:
> On Tue, 16 Jul 2002, Alessandro Baretta wrote:
>>class c =
>>object
>>   inherit a as super_a through b as super_b { through 
>><class> as <identifier> }*
>>...
>>end
>>
> 
> 
> isn't multiple inheritance enougth for this ?
> 
> class c =
>   object
>     inherit a as super_a
>     inherit b as super_b
>     method m = super_a # m
>     (* other method are left unchanged *)
>   end
> 
> 

Definitely not. By using multiple inheritance as you 
suggest, class c inherits from class a *twice*, thereby 
having double copies of all instance variables declared in 
a. This is bad. Consider how difficult it is to manage a 
multiple-path inheritance in C++, and how that has rendered 
necessary the use of "virtual" memember objects.

Alex

-------------------
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


  parent reply	other threads:[~2002-07-16 10:03 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-07-15 23:13 Alessandro Baretta
2002-07-16  1:15 ` Jacques Garrigue
2002-07-16  9:28   ` Alessandro Baretta
2002-07-16  9:48     ` Laurent Vibert
2002-07-16 10:08       ` Johan Baltié
2002-07-16 10:10       ` Alessandro Baretta [this message]
2002-07-16  9:59     ` Johan Baltié
2002-07-16 11:08       ` [Caml-list] Recovering masked methods (with CamlP4?) Alessandro Baretta
2002-07-16 11:32         ` Johan Baltié
2002-07-16 12:52           ` Alessandro Baretta
2002-07-16 12:26         ` Daniel de Rauglaudre
2002-07-16 12:54           ` Alessandro Baretta
2002-07-17  9:26             ` Daniel de Rauglaudre
2002-07-16 13:32         ` John Prevost
2002-07-16 13:35           ` John Prevost
2002-07-16 14:06           ` Alessandro Baretta
2002-07-16 14:15             ` Johan Baltié
2002-07-16 14:29               ` Alessandro Baretta
2002-11-11  9:20         ` Eray Ozkural
2002-07-16 10:45     ` [Caml-list] Recovering masked methods John Prevost

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=3D33F12E.9090006@baretta.com \
    --to=alex@baretta.com \
    --cc=caml-list@inria.fr \
    --cc=lvibert@irisa.fr \
    /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).