From: Jon Harrop <jon@jdh30.plus.com>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Phantom types
Date: Mon, 23 Aug 2004 16:16:58 +0100 [thread overview]
Message-ID: <200408231616.58139.jon@jdh30.plus.com> (raw)
In-Reply-To: <200408231049.59342.jon@jdh30.plus.com>
On Monday 23 August 2004 10:49, Jon Harrop wrote:
> Secondly, specifying the types as Markus did (e.g. [> `Even])...
I should add, using:
val add_even_even : [> `Even ] t -> [> `Even ] t -> [> `Even ] t
val add_even_odd : [> `Even ] t -> [> `Odd ] t -> [> `Odd ] t
allows:
# PhantomInt.add_even_odd i j;;
val k : _[> `Odd ] PhantomInt.t = <abstr>
which can then be misused:
# PhantomInt.add_even_even i k;;
- : [ `Even ] PhantomInt.t = <abstr>
I think this is because [> `Even] means any superset of [ `Even ] whereas [<
`Even], which was probably intended, means any subset of [ `Even ]. Indeed,
the latter appears to work.
Cheers,
Jon.
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next prev parent reply other threads:[~2004-08-23 15:20 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-31 8:56 [Caml-list] const equivalent for mutable types? Christopher A. Gorski
2004-07-31 9:24 ` Jean-Marie Gaillourdert
2004-07-31 10:24 ` Jean-Marie Gaillourdert
2004-07-31 10:50 ` Markus Mottl
2004-07-31 14:31 ` Brian Hurt
2004-07-31 15:51 ` Markus Mottl
2004-07-31 17:05 ` skaller
2004-07-31 10:34 ` Markus Mottl
2004-07-31 13:44 ` Jon Harrop
2004-07-31 16:31 ` [Caml-list] Phantom types Markus Mottl
2004-08-23 9:49 ` Jon Harrop
2004-08-23 12:25 ` [Caml-list] Why does ocaml use custom buffering? Daan Leijen
2004-08-23 15:16 ` Jon Harrop [this message]
2004-08-27 9:03 ` [Caml-list] Phantom types Jacques GARRIGUE
2004-08-25 21:03 ` brogoff
2004-07-31 16:35 ` [Caml-list] const equivalent for mutable types? skaller
2004-07-31 17:23 ` [Caml-list] Functional arrays Jon Harrop
2004-07-31 18:45 ` skaller
2004-08-02 5:07 ` brogoff
2004-08-02 7:45 ` Diego Olivier Fernandez Pons
2004-08-05 16:42 ` Daniel Ortmann
2004-08-05 17:02 ` Diego Olivier Fernandez Pons
2004-08-05 17:16 ` Diego Olivier Fernandez Pons
2004-07-31 17:45 ` [Caml-list] const equivalent for mutable types? Chris Gorski
2004-07-31 14:11 ` Brian Hurt
2010-05-17 14:59 Phantom types Thomas Braibant
2010-05-17 16:37 ` [Caml-list] " Goswin von Brederlow
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