From: Chris Hecker <checker@d6.com>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Design advice
Date: Sat, 28 Sep 2002 03:55:43 -0700 [thread overview]
Message-ID: <4.3.2.7.2.20020928033941.03b2eb10@mail.d6.com> (raw)
In-Reply-To: <ud6qznzvc.fsf@dfan.thecia.net>
I usually use variants, but it's not like I've been programming caml for
much longer than you have.
>type, but now I have to convert this to an integer whenever I want to
>use the player number as an index.
Note that there is a correspondence between variant constructors with no
arguments and integers
(http://caml.inria.fr/ocaml/htmlman/manual032.html#htoc212), so:
type suit = Spades | Hearts | Diamonds | Clubs
let suit_to_int (s : suit) =
assert (Obj.is_int (Obj.repr s));
((Obj.magic s) : int)
The assert will catch it if you add variables to one of the constructors
and then call this. This uses magic, which is bad, but it alleviates you
having to type the variant constructors again and possibly make an error in
the assocation with the int, which is good. Pick your poison.
Chris
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next prev parent reply other threads:[~2002-09-28 10:55 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-27 16:47 Dan Schmidt
2002-09-28 10:48 ` John Prevost
2002-09-28 10:55 ` Chris Hecker [this message]
2002-09-28 19:02 ` William Lovas
2002-09-28 22:01 ` John Gerard Malecki
2002-09-28 23:03 ` Chris Hecker
2002-09-30 15:35 ` Kontra, Gergely
2002-09-28 22:46 ` Chris Hecker
2002-09-29 12:27 ` Lauri Alanko
2002-09-30 16:03 ` Alessandro Baretta
2002-10-01 11:37 ` Xavier Leroy
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