From: Damien Doligez <Damien.Doligez@inria.fr>
To: caml-list@inria.fr, jehenrik@yahoo.com
Subject: Re: [Caml-list] C ffi issue
Date: Wed, 19 Sep 2001 11:55:07 +0200 (MET DST) [thread overview]
Message-ID: <200109190955.LAA0000027232@beaune.inria.fr> (raw)
>According to the C interface documentation, assignments to tuple
>members must be done with the modify(value*,value) function.
>However, local variables once registered with the GC can apparently
>just be assigned. If I do this instead will anything crash?
>
> CAMLlocal1(nontuple);
> modify(&nontuple,mydata); // should just be nontuple=mydata;
Although it was not designed for this use, modify will work correctly
in this context. I now guarantee that it won't crash if you use it in
this way. It is a bit less efficient than direct assignment
(it does a little pointer arithmetic plus a memory read and a
conditional branch).
-- Damien
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next reply other threads:[~2001-09-19 9:55 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-19 9:55 Damien Doligez [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-09-19 6:57 Jeff Henrikson
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