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convertion between OCaml Big_int and C
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Date: 2010-10-13 (16:01)
From: Jianzhou Zhao <jianzhou@s...>
Subject: Re: [Caml-list] convertion between OCaml Big_int and C
On Wed, Oct 13, 2010 at 10:48 AM, Olivier Schwander
<> wrote:
> Le 13 Oct 2010 10:26, Jianzhou Zhao a écrit:
>> I am not sure if this is a reasonable question. Does OCaml already
>> have functions that do convertion between arbitrary-precision integers
>> big_int in OCaml and any representation of large intergers in C? The
>> implementation of big_int (otherlibs/num/big_int.*) uses nat
>> (otherlibs/num/nat.*). Nat is a customized allocation (in C) as a list
>> of native integers to represent arbitrary-precision. So converting
>> big_int into C seems possible to me.
> It seems you should have a look at the numerix library or at the OCaml
> binding for GMP. I never used any of them so I cannot guaranty there are
> really working (there are not a lot of references to them) but I think
> they are more likely to be usable on both OCaml and C side.

Thanks. Are they the MLGMP and Numerix listed in "the Caml Hump:
General purpose libraries :: Numeric computation" ?
>From the documents of Numerix, it runs much faster than the big_int
library, although it may not be as portable as the 'nat' that big_int
replies on.

> Cheers,
> Olivier
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