[Caml-list] ocaml 4.01.0 Marshal dumping on Object

[Caml-list] ocaml 4.01.0 Marshal dumping on Object

[Xavier Van de Woestyne]

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Hi, first, i'm really sorry for my Ugly english.
Actually, i'm working on a little module for Data manipulation.
https://github.com/nukiFW/Oml/blob/master/src/omlDatabase.ml
But I've some problems when I try to serialize an Object :

*Exception: Invalid_argument "output_value: abstract value (outside heap)*

I don't use abstract type, only Object. In my Marshal rules I have use
Marshal.Closures, but it's not working.
Thanks a lot (and happy new year).

-- 
Xavier Van de Woestyne
xavier.vdw@gmail.com - TEL BE : 0474 49 53 83 | TEL FR : 06 73 38 72 84

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Re: [Caml-list] ocaml 4.01.0 Marshal dumping on Object

[ygrek]

On Wed, 29 Jan 2014 02:09:52 +0100
Xavier Van de Woestyne <xavier.vdw@gmail.com> wrote:

> But I've some problems when I try to serialize an Object :
> 
> *Exception: Invalid_argument "output_value: abstract value (outside heap)*

Quoting the manual[1] :

> If flags does not contain Marshal.Closures, marshaling fails when it
> encounters a functional value inside v: only 'pure' data structures,
> containing neither functions nor objects, can safely be transmitted
> between different programs. If flags contains Marshal.Closures,
> functional values will be marshaled as a position in the code of the
> program. In this case, the output of marshaling can only be read back
> in processes that run exactly the same program, with exactly the same
> compiled code. (This is checked at un-marshaling time, using an MD5
> digest of the code transmitted along with the code position.)

I read it as objects are not marshallable at all.

[1]: http://caml.inria.fr/pub/docs/manual-ocaml/libref/Marshal.html

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