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From: "Nicolas Cannasse" <warplayer@free.fr>
To: <caml-list@inria.fr>, "Paul Argentoff" <argentoff@rtelekom.ru>
Subject: Re: [Caml-list] let () =
Date: Tue, 3 Aug 2004 19:08:37 +0200	[thread overview]
Message-ID: <003c01c4797c$8475ba30$ef01a8c0@warp> (raw)
In-Reply-To: <86hdrkth3f.fsf@paul.rtelekom.ru>

> Hello World!
>
> Can anyone answer my silly question: what does "let () = bla" really mean?

let () = bla is equivalent to writing bla; but is opening a block if
followed by an 'in'.

Here are the different forms :

bla; (* warning if partial application or if returned type not unit *)
ignore(bla); (* warning if partial application, ignore returned type *)
let () = bla (* error if partial application or if returned type not unit *)
let _ = bla (* no warning or errors !! be careful if you want to use it *)

Regards,
Nicolas Cannasse

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  parent reply	other threads:[~2004-08-03 17:09 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-08-03 14:46 Paul Argentoff
2004-08-03 15:09 ` Yann Regis-Gianas
2004-08-03 15:10 ` Richard Jones
2004-08-03 15:11 ` John Prevost
2004-08-03 17:08 ` Nicolas Cannasse [this message]
2004-08-04 10:14   ` Keith Wansbrough

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