From: Jacques Garrigue <garrigue@kurims.kyoto-u.ac.jp>
To: zack@bononia.it
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] undocumented external ... = "%identity"
Date: Wed, 29 Oct 2003 20:39:35 +0900 [thread overview]
Message-ID: <20031029203935I.garrigue@kurims.kyoto-u.ac.jp> (raw)
In-Reply-To: <20031029104248.GA6566@fistandantilus.takhisis.org>
From: Stefano Zacchiroli <zack@bononia.it>
> It seems to me that the "%identity" feature, as in
>
> external unsafe_cast : 'a obj -> 'b obj = "%identity"
>
> is undocumented. Am I wrong? If not is there any particular reason for
> so? According to http://caml.inria.fr/archives/200208/msg00034.html is
> not meant to be used by the end user, but if it's better than Obj.magic
> and used by lablgtk I see no reason to not mention it in the
> "Interfacing C with Objective Caml" chapter of the OCaml documentation.
> Maybe with a huge disclaimer ...
It is equivalent to Obj.magic, which uses the same external.
The only interest is that you can choose to give it a type more
restrictive than Obj.magic, while still being an external.
This way %identity completely disappears during compilation.
I suppose that as Obj.magic is not documented, this is not documented
either.
Jacques Garrigue
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next prev parent reply other threads:[~2003-10-29 11:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-29 10:42 Stefano Zacchiroli
2003-10-29 11:39 ` Jacques Garrigue [this message]
2003-10-30 19:55 ` Stefano Zacchiroli
2003-10-31 7:47 ` William Lovas
2003-11-01 8:22 ` Stefano Zacchiroli
2003-11-03 14:03 ` Damien Doligez
2003-11-03 14:20 ` Nicolas Cannasse
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