From: Xavier Leroy <Xavier.Leroy@inria.fr>
To: "Alexander V. Voinov" <avv@quasar.ipa.nw.ru>
Cc: caml <caml-list@inria.fr>
Subject: Re: [Caml-list] Data_custom_val(v)
Date: Fri, 20 Jul 2001 16:00:36 +0200 [thread overview]
Message-ID: <20010720160036.G9351@pauillac.inria.fr> (raw)
In-Reply-To: <3B510B1B.4552AFA1@quasar.ipa.nw.ru>; from avv@quasar.ipa.nw.ru on Sat, Jul 14, 2001 at 08:16:43PM -0700
> I forgot to mention that Data_custom_val(v) doesn't allow for
> assignments in C++, instead I have to use
>
> value blk = alloc_custom(...);
> *(void **)&(Field(blk, 1)) = (void *)some_data;
Don't do that, because someday the data part of the custom block may
not be at offset 1.
What is wrong with
value blk = alloc_custom(...);
mytype * mydata = (mytype *) Data_custom_val(v);
*mydata = <initial value>;
or, more concisely,
*((mytype *) Data_custom_val(v)) = <initial value>;
Is it that evil C++ that don't let you do that?
- Xavier Leroy
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prev parent reply other threads:[~2001-07-20 14:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-15 3:16 Alexander V. Voinov
2001-07-20 14:00 ` Xavier Leroy [this message]
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