From: Pietro Abate <Pietro.Abate@anu.edu.au>
To: caml-list@yquem.inria.fr, OCaml Mailing List <caml-list@inria.fr>
Subject: Re: [Caml-list] Variable pattern matching tuple
Date: Tue, 19 Sep 2006 11:40:33 +1000 [thread overview]
Message-ID: <20060919014033.GA24064@pulp.rsise.anu.edu.au> (raw)
In-Reply-To: <6dbd4d000609181826p6beca937y515903dc76628fc3@mail.gmail.com>
On Mon, Sep 18, 2006 at 09:26:15PM -0400, Denis Bueno wrote:
> What is the reason that expression A won't compile? Can't one variable
> stand for a tuple in a pattern-matching clause?
somebody was discussing a similar issue on the beginners
mailing list this week:
type 'a withint = Withint of ('a * int);;
type 'a withint = Withint of ('a * int)
let foo = Withint ("hi there", 4);;
val foo : string withint = Withint ("hi there", 4)
match foo with Withint d -> d;; ;;
- : string * int = ("hi there", 4)
if you want to pattern match the tuple you need to add parenthesis
in the type declaration.
have a look here for a detailed explanation:
http://www.archivesat.com/Ocaml_Beginners/thread1620469.htm
:)
p
--
++ Blog: http://blog.rsise.anu.edu.au/?q=pietro
++
++ "All great truths begin as blasphemies." -George Bernard Shaw
++ Please avoid sending me Word or PowerPoint attachments.
See http://www.fsf.org/philosophy/no-word-attachments.html
prev parent reply other threads:[~2006-09-19 1:40 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-19 1:26 Denis Bueno
2006-09-19 1:40 ` Pietro Abate [this message]
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