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Date: Mon, 20 Jan 2003 21:58:20 +0100
To: Christoph Bauer <c_bauer@informatik.uni-kl.de>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Need unsigned int
Message-ID: <20030120205820.GA3051@iliana>
References: <m3d6mrej5p.fsf@diebuntekuh.de>
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From: Sven Luther <luther@dpt-info.u-strasbg.fr>
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On Mon, Jan 20, 2003 at 08:05:38PM +0100, Christoph Bauer wrote:
> Hi, 
> 
> my program need to calculate a hash key of a matrix (with dimension 8
> x 8).  It is necessary that this calculation is very fast, so my
> program will update the hash key after every small modification of the
> matrix. My problem is that the hash key should be an unsigned int
> or an unsigned long in. 
> 
> My problem occurs here (Mersenne prime number 2^31-1):
> let big_prim = 2147483647
> val big_prim : int = -1

Solution #1 : buy yourself a 64bit box, and you will have integers upto
2^63-1 :)))

Solution #2 : Use the Int64 module.

Solution #3 : Use the ocaml bignum module.

Friendly,

Sven Luther
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