From: Gabriel Kerneis <kerneis@pps.jussieu.fr>
To: Thomas Gazagnaire <thomas.gazagnaire@inria.fr>
Cc: Serge Le Huitouze <serge.lehuitouze@gmail.com>, caml-list@yquem.inria.fr
Subject: Re: [Caml-list] Option functions (or lack thereof) + operator for composition
Date: Tue, 16 Nov 2010 12:51:15 +0100 [thread overview]
Message-ID: <20101116115115.GA4149@rhodium.pps.jussieu.fr> (raw)
In-Reply-To: <1289907810.2954.148.camel@saorge.inria.fr>
On Tue, Nov 16, 2010 at 12:43:30PM +0100, Thomas Gazagnaire wrote:
> You are not forced to use match expression, you can just define :
> let is_none x = match x with None -> true | Some _ -> false
> and is_some x = not (is_none x)
> and then use these functions in your code ...
Or even simpler:
let is_none = (=) None
let is_some = (!=) None
Note that you can use this directly, for instance:
List.filter ((!=) None) l
Best,
--
Gabriel
next prev parent reply other threads:[~2010-11-16 11:51 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1853021343.44703.1289906871683.JavaMail.root@zmbs4.inria.fr>
2010-11-16 11:43 ` Thomas Gazagnaire
2010-11-16 11:51 ` Gabriel Kerneis [this message]
2010-11-16 17:45 ` Martin Jambon
2010-11-16 11:27 Serge Le Huitouze
2010-11-16 11:49 ` [Caml-list] " David Allsopp
2010-11-16 14:23 ` Michael Ekstrand
2010-11-16 13:30 ` Jacques Garrigue
2010-11-16 13:52 ` Serge Le Huitouze
2010-11-16 14:19 ` dmitry grebeniuk
2010-11-16 14:26 ` Michael Ekstrand
2010-11-16 15:18 ` bluestorm
2010-11-16 15:26 ` bluestorm
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