From: Maxence Guesdon <max@sbuilders.com>
To: Mattias Waldau <mattias.waldau@abc.se>
Cc: Caml-List <caml-list@inria.fr>
Subject: Re: Same label in different types, how do people solve this?
Date: Thu, 07 Dec 2000 19:34:46 +0100 [thread overview]
Message-ID: <3A2FD846.B9EFE70F@sbuilders.com> (raw)
In-Reply-To: <HDEEKOMJILGEIHIMAPCDMEJMDLAA.mattias.waldau@abc.se>
Mattias Waldau a écrit :
>
> In Ocaml, you cannot have the same label in different types, see the example
> below where
> point_2d hides point_3d.
>
> How do people normally code around this restriction? One solution is using
> objects, but what other solutions are there? Can 'Polymorphic variants'
> solve this?
In your example, and without objects, I would have chosen explicit names
for labels, i.e. :
type point_3d = {
p3d_x:float;
p3d_y:float;
p3d_z:float;
}
type point_2d = {
p2d_x:float;
p2d_y:float;
}
It sure is kind of a pain to write, but it is much more easy to
understand when you read it. With
explicit labels, you "see" the type of toto in toto.p3d_x. I think not
allowing to have the same label
in different types is a great way to force developers to write cleaner
code ;-)
----------------------
Maxence Guesdon
http://maxence.guesdon.free.fr
next prev parent reply other threads:[~2000-12-08 9:07 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-12-06 21:22 Mattias Waldau
2000-12-07 16:49 ` John Max Skaller
2000-12-07 18:34 ` Maxence Guesdon [this message]
2000-12-07 23:02 ` Gerd Stolpmann
2000-12-08 1:22 ` Jacques Garrigue
2000-12-08 9:31 ` Sven LUTHER
2000-12-08 9:36 ` Pierre Weis
2000-12-08 9:48 ` Sven LUTHER
2000-12-08 18:41 ` John Max Skaller
2000-12-08 9:40 ` Nicolas barnier
2000-12-08 16:36 ` Brian Rogoff
2000-12-11 17:19 ` Pierre Weis
2000-12-10 12:49 ` Mattias Waldau
2000-12-11 18:23 ` Chris Hecker
2000-12-11 19:17 ` Pierre Weis
2000-12-12 10:02 ` Sven LUTHER
2000-12-12 3:25 ` Chet Murthy
2000-12-12 17:43 ` John Max Skaller
2000-12-12 19:24 ` Functions must be explicitly typed, (was Same label in different types, how do people solve this?) Mattias Waldau
2000-12-13 0:51 ` John Max Skaller
2000-12-15 10:13 ` Andreas Rossberg
2000-12-15 12:50 ` Frank Atanassow
2000-12-14 18:42 ` Stefan Monnier
2000-12-15 12:47 ` Pierre Weis
2000-12-15 13:39 ` Mattias Waldau
2000-12-15 23:37 ` Brian Rogoff
2000-12-16 14:10 ` ROverloading John Max Skaller
2000-12-15 21:51 ` Same label in different types, how do people solve this? Bruce Hoult
2000-12-12 17:19 ` John Max Skaller
2000-12-10 14:57 Ohad Rodeh
2000-12-13 13:17 Dave Berry
2000-12-13 14:31 ` Mattias Waldau
2000-12-15 10:01 ` John Max Skaller
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