Version française
Home     About     Download     Resources     Contact us    
Browse thread
convertion between OCaml Big_int and C
[ Home ] [ Index: by date | by threads ]
[ Search: ]

[ Message by date: previous | next ] [ Message in thread: previous | next ] [ Thread: previous | next ]
Date: -- (:)
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
<olivier.schwander@chadok.info> 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" ?
  http://caml.inria.fr/cgi-bin/hump.en.cgi?sort=0&browse=75
>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
>
> _______________________________________________
> Caml-list mailing list. Subscription management:
> http://yquem.inria.fr/cgi-bin/mailman/listinfo/caml-list
> Archives: http://caml.inria.fr
> Beginner's list: http://groups.yahoo.com/group/ocaml_beginners
> Bug reports: http://caml.inria.fr/bin/caml-bugs
>



-- 
Jianzhou