From: "Mattias Waldau" <mattias.waldau@abc.se>
To: "Caml-List" <caml-list@inria.fr>
Subject: Same label in different types, how do people solve this?
Date: Wed, 6 Dec 2000 22:22:24 +0100 [thread overview]
Message-ID: <HDEEKOMJILGEIHIMAPCDMEJMDLAA.mattias.waldau@abc.se> (raw)
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?
Also, I am a bit curious why it doesn't help to type explicitely, i.e. to
write
let x:point_3d={x=10.;y=20.;z=30.} ???
/mattias
type point_3d = {
x:float;
y:float;
z:float;
}
type point_2d = {
x:float;
y:float;
}
# {x=10.;y=20.;z=30.};;
Characters 0-19:
The record field label z belongs to the type point_3d
but is here mixed with labels of type point_2d
# {x=10.;y=20.};;
- : point_2d = {x=10.000000; y=20.000000}
next reply other threads:[~2000-12-07 8:13 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-12-06 21:22 Mattias Waldau [this message]
2000-12-07 16:49 ` John Max Skaller
2000-12-07 18:34 ` Maxence Guesdon
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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