From: "Olivier Andrieu" <oandrieu@gmail.com>
To: "Jon Harrop" <jon@ffconsultancy.com>
Cc: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] Deconstructing optional arguments
Date: Fri, 11 Apr 2008 12:36:11 +0200 [thread overview]
Message-ID: <95513600804110336o2b715b2l7fdca4c3cd2727f2@mail.gmail.com> (raw)
In-Reply-To: <200804111024.16296.jon@ffconsultancy.com>
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On Fri, Apr 11, 2008 at 11:24 AM, Jon Harrop <jon@ffconsultancy.com> wrote:
>
> Is it possible to deconstruct an optional argument as you can with a labeled
> argument:
>
> let f ~p:(x,y) () = x - y
>
> with something like:
>
> let f ?(p=0,0):(x,y) () = x - y
sure, cf. the grammar in the refman
http://caml.inria.fr/pub/docs/manual-ocaml/expr.html
parameter ::=
...
¨O ? label-name : ( pattern [: typexpr] [= expr] )
let f ?p:(x,y=0,0) () = x - y
--
Olivier
prev parent reply other threads:[~2008-04-11 10:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-11 9:24 Jon Harrop
2008-04-11 10:06 ` [Caml-list] " Alain Frisch
2008-04-11 10:36 ` Olivier Andrieu [this message]
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