[Caml-list] help regarding 'union'

[Caml-list] help regarding 'union'

[Animesh Pathak]

dear members,
I am new to caml and am currently trying to write a program which involves 
sending of data across a network connection. What I have to do is to send a 
complex structure (containing lists of integers, mutexes etc. ) across a 
network. In C, i would have used a 'union' with a char array and sent the 
array... how is it done in caml?
Kindly help me regarding this problem of mine.

thanks in advance.
-Animesh
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Re: [Caml-list] help regarding 'union'

[Michal Moskal]

On Tue, May 28, 2002 at 09:52:54AM +0200, Animesh Pathak wrote:
> dear members,
> I am new to caml and am currently trying to write a program which involves 
> sending of data across a network connection. What I have to do is to send a 
> complex structure (containing lists of integers, mutexes etc. ) across a 
> network. In C, i would have used a 'union' with a char array and sent the 
> array... how is it done in caml?
> Kindly help me regarding this problem of mine.

Look at module Marshal. You can convert any (well, non-cyclic)
datastructure to string and send it. However beware that marshalled
structures might be imcompatible between OCaml releases (they however
are compatible (unlike C union solution) between different machines).

-- 
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Re: [Caml-list] help regarding 'union'

[YAMAGATA yoriyuki]

From: Michal Moskal <malekith@pld-linux.org>
Subject: Re: [Caml-list] help regarding 'union'
Date: Tue, 28 May 2002 12:26:01 +0200

> You can convert any (well, non-cyclic) datastructure to string and
> send it.

The manual states that cyclic structure is ok if you do not pass
Non_sharing option.

> However beware that marshalled structures might be imcompatible
> between OCaml releases

I have an impression that Marshaling format has not changed quite a
while.  (For example, ocamlnet sources contain Marshaled data as
string.)  Could someone confirm this?
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