[Caml-list] Big_int

[Caml-list] Big_int

[Marcin 'Qrczak' Kowalczyk]

Why do these functions perform copies of the abs_value instead of
sharing it? I thought that big_ints are immutable.

(* Opposite of a big_int *)
let minus_big_int bi =
 { sign = - bi.sign;
   abs_value = copy_nat (bi.abs_value) 0 (num_digits_big_int bi)}

(* Absolute value of a big_int *)
let abs_big_int bi =
    { sign = if bi.sign = 0 then 0 else 1;
      abs_value = copy_nat (bi.abs_value) 0 (num_digits_big_int bi)}

-- 
 __("<  Marcin Kowalczyk * qrczak@knm.org.pl http://qrczak.ids.net.pl/
 \__/
  ^^
QRCZAK

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Re: [Caml-list] big_int

[Serge Aleynikov]

Sorry for extra noise - I found what I needed in the nat_stubs.c of the 
numeric library that comes in the sources of distribution.

Serge

Serge Aleynikov wrote:
> Greetings!
> 
> I'm trying to figure out how to pass a big integer (encoded using GMP 
> library) from C to OCaml so that it could be read on the OCaml side 
> using Big_int module.  The interoperability macros listed in the manual 
> (http://caml.inria.fr/pub/docs/manual-ocaml/manual032.html) and in the 
> interoperability header files don't seem to have anything applicable for 
> Big_int's.
> 
> Could someone point me to an example or resource of how to encode/decode 
> a Big_int from/to C?
> 
> Thanks.
> 
> Serge
> 

-- 
Serge Aleynikov
Routing R&D, IDT Telecom
Tel: +1 (973) 438-3436
Fax: +1 (973) 438-1464