From: Yamagata Yoriyuki <yoriyuki@mbg.ocn.ne.jp>
To: kknowles@berkeley.edu
Cc: alex@baretta.com, caml-list@inria.fr
Subject: Re: [Caml-list] Delegation based OO
Date: Wed, 24 Mar 2004 08:43:00 +0900 (JST) [thread overview]
Message-ID: <20040324.084300.18291498.yoriyuki@mbg.ocn.ne.jp> (raw)
In-Reply-To: <20040323002926.GA30057@kefka.frap.net>
From: Kenneth Knowles <kknowles@berkeley.edu>
Subject: Re: [Caml-list] Delegation based OO
Date: Mon, 22 Mar 2004 16:29:26 -0800
> This is a type error, just as if you override a class method with one of a
> different type:
>
> # class x = object method y = 3 end;;
> class x : object method y : int end
> # class y = object inherit x method y = 4 end;;
> class y : object method y : int end
> # class z = object inherit x method y = "hello" end;;
> This expression has type string but is here used with type int
>
> The same strictness could be applied to delegation.
There is a difference. You cannot hide the method "y" in the class
definition "x". An object can be coerced to a super type, so that it's
type would forget about the method "y", then you override it...
--
Yamagata Yoriyuki
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next prev parent reply other threads:[~2004-03-23 23:43 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-22 10:18 Alex Baretta
2004-03-22 23:01 ` Yamagata Yoriyuki
2004-03-23 0:29 ` Kenneth Knowles
2004-03-23 23:43 ` Yamagata Yoriyuki [this message]
2004-03-24 0:45 ` Kenneth Knowles
2004-03-24 10:43 ` Alex Baretta
2004-03-24 14:11 ` Yamagata Yoriyuki
2004-03-24 15:00 ` Alex Baretta
2004-03-24 16:57 ` Kenneth Knowles
2004-03-23 1:14 ` Jacques Garrigue
2004-03-23 7:27 ` Alex Baretta
2004-03-23 9:01 ` Stefano Zacchiroli
2004-03-23 9:41 ` Alex Baretta
2004-03-23 9:44 ` Jacques Garrigue
2004-03-23 9:47 ` Stefano Zacchiroli
2004-03-23 8:56 ` Correnson Loïc
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