From: Benjamin Geer <ben@socialtools.net>
To: Jacques Garrigue <garrigue@kurims.kyoto-u.ac.jp>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] does class polymorphism need to be so complicated?
Date: Fri, 22 Aug 2003 08:12:59 +0100 [thread overview]
Message-ID: <3F45C27B.4080806@socialtools.net> (raw)
In-Reply-To: <20030822125953S.garrigue@kurims.kyoto-u.ac.jp>
Jacques Garrigue wrote:
> Because #connection is _not_ an interface. It is just a polymorphic
> type including all types having more methods than connection.
> So returning a #connection means that the returned object already has
> all the methods in the world, with all types imaginable. Nonsense.
>
> #connection only makes sense on the left-hand side of an arrow.
Thanks for this explanation. It shows very clearly the advantage of
using the approach involving coercions: with coercions, a method can
return an instance of the base class, so factory methods become possible.
Ben
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next prev parent reply other threads:[~2003-08-22 7:17 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-20 15:42 Benjamin Geer
2003-08-20 16:05 ` Brian Hurt
2003-08-20 16:19 ` Richard Jones
2003-08-20 16:25 ` Benjamin Geer
2003-08-20 17:09 ` brogoff
2003-08-20 17:25 ` Jacques Carette
2003-08-20 23:34 ` Jacques Garrigue
2003-08-21 13:27 ` Jacques Carette
2003-08-20 18:19 ` Benjamin Geer
2003-08-20 20:39 ` brogoff
2003-08-20 21:04 ` Benjamin Geer
2003-08-21 0:28 ` Jacques Garrigue
2003-08-21 8:17 ` Benjamin Geer
2003-08-21 8:58 ` Jacques Garrigue
2003-08-21 9:38 ` Benjamin Geer
2003-08-21 11:44 ` Remi Vanicat
2003-08-21 13:11 ` Richard Jones
2003-08-21 16:41 ` Remi Vanicat
2003-08-21 18:04 ` brogoff
2003-08-21 20:20 ` Benjamin Geer
2003-08-21 23:35 ` Benjamin Geer
2003-08-22 3:59 ` Jacques Garrigue
2003-08-22 7:12 ` Benjamin Geer [this message]
2003-08-21 13:38 ` Benjamin Geer
2003-08-21 0:58 ` brogoff
2003-08-20 23:40 ` Benjamin Geer
2003-08-21 1:29 ` Jacques Garrigue
2003-08-21 9:19 ` Benjamin Geer
2003-08-21 18:44 ` Chris Clearwater
2003-08-20 20:43 ` Issac Trotts
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