From: Chris Hecker <checker@d6.com>
To: Mark Wotton hons2001 <mrak@cs.usyd.edu.au>, caml-list@inria.fr
Subject: Re: [Caml-list] Subtypes in Ocaml
Date: Wed, 25 Apr 2001 00:35:26 -0700 [thread overview]
Message-ID: <4.3.2.7.2.20010425002928.00d588b0@shell16.ba.best.com> (raw)
In-Reply-To: <Pine.LNX.4.21.0104251544420.14021-100000@hons.cs.usyd.edu.au>
>Patternmatching seems to do it. if this isn't the right way to do it,
>please, someone let me know before i do something stupid.
I'm not 100% sure what you're saying. My first interpretation of your question leads me to say "this is what variants and pattern matching are all about". Since a variant is a union type, it can be a Literal and just an expression and pattern matching will let you choose which to interpret it as.
My second interpretation is that you want to have a function typed to only take a subset of the variant type. In this case, you can either use exceptions (the default pattern match one, or one raised with a | _ -> failwith "bad type" if you don't want the compiler warnings), or I think you can do something with polymorphic variants, but I must admit to being kind of confused by them.
Chris
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next prev parent reply other threads:[~2001-04-25 7:34 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-23 10:05 [Caml-list] Cygwin ocaml crashes wester
2001-04-23 13:49 ` Alan Schmitt
2001-04-23 14:16 ` wester
2001-04-23 15:39 ` Alan Schmitt
2001-04-23 15:59 ` Mattias Waldau
2001-04-24 7:00 ` wester
2001-04-24 7:44 ` Alan Schmitt
2001-04-24 20:52 ` Mattias Waldau
2001-04-25 3:17 ` [Caml-list] Subtypes in Ocaml Mark Wotton hons2001
2001-04-25 5:45 ` Mark Wotton hons2001
2001-04-25 7:35 ` Chris Hecker [this message]
2001-04-25 7:42 ` Mark Wotton hons2001
2001-04-25 11:04 ` Jean-Francois Monin
2001-04-25 10:02 ` [Caml-list] Cygwin ocaml crashes Christophe Macabiau
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