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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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  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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