From: William Lovas <wlovas@stwing.upenn.edu>
To: Ocaml <caml-list@inria.fr>
Subject: Re: [Caml-list] Pattern matching missing (or brain damage?)
Date: Thu, 18 Jul 2002 20:08:59 -0400 [thread overview]
Message-ID: <20020719000859.GB22176@force.stwing.upenn.edu> (raw)
In-Reply-To: <3D373FB4.20509@baretta.com>
On Fri, Jul 19, 2002 at 12:22:44AM +0200, Alessandro Baretta wrote:
> I believe I remember a pattern matching construct where an
> expression could be associated with multiple patterns.
>
> match <expr> with
> | A(_) | B(_) | C(_) -> foo
> | C(_) | D(_) | E(_) -> bar
>
> Neither does the compiler accept such code, nor does the
> manual mention such construct. Has it been removed from the
> language or am I suffering severe brain damage from too much
> O'Caml coding?
This is legal. It's covered in the Chapter 6 of the manual, under
Patterns, sub-heading ``Or'' patterns:
http://caml.inria.fr/ocaml/htmlman/manual014.html
You might be having trouble if your subpatterns don't bind exactly
the same variables...
William
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next prev parent reply other threads:[~2002-07-19 0:09 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-18 22:22 Alessandro Baretta
2002-07-18 22:36 ` Michael Vanier
2002-07-20 15:28 ` Oleg
2002-07-19 0:08 ` William Lovas [this message]
2002-07-19 1:09 ` Alessandro Baretta
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