RE: [Boost-users] RE: Boost thread problem

From: Sliwa, Przemyslaw (London) (Przemyslaw_Sliwa_at_[hidden])
Date: 2005-04-18 03:11:15

Why not?

AFAIK GSL, one of the most important open source numerical libraries
uses double precision, so I do not see the point why you say double is
not good enough for scientific applications.

Regards,

Pshemek

-----Original Message-----
From: boost-users-bounces_at_[hidden]
[mailto:boost-users-bounces_at_[hidden]] On Behalf Of Mauricio Gomes
Sent: 17 April 2005 04:12
To: boost-users_at_[hidden]
Subject: Re: [Boost-users] RE: Boost thread problem

Ben is right, you simply can't use double for any serious 
financial/scientific calculation.
And indeed I hope someday an arbitrary math precision library be part 
of the standard C++.

Look for a standard for the place where this is going to be used.
If there isn't one. Use an arbitrary math precision library anyway.

Take a look at mapm:
http://www.cuj.com/documents/s=8020/cuj0111ring/
http://www.tc.umn.edu/~ringx004/mapm-main.html

There are other comercial alternatives, a quick google search produced 
this:
http://www.boic.com/b1mnum.pdf
http://www.boic.com/numintro.htm

Hope this helps,
Mauricio Gomes
Pensar Digital
phone: [phone]
mobile: [phone]
http://pensardigital.com

On Apr 15, 2005, at 2:37 PM, Ben Hutchings wrote:

> Sliwa, Przemyslaw (London) wrote:
>> Thanks, Ben, what should I use for representing the money amounts? A 
>> boolean :)) ?
>
> If you're dealing with other people's money then there are regulations

> that specify the required intermediate precision and rounding rules, 
> which may vary from place to place.  I believe you'll need to use 
> fixed-point decimal fractions, perhaps implemented as integer counts 
> of hundredths or ten-thousandths of a currency unit.  I've not done 
> this myself so I don't know the details, but I'm fairly sure that 
> getting this wrong can put you on the wrong side of the law.
>
> Ben.
> _______________________________________________
> Boost-users mailing list
> Boost-users_at_[hidden]
> http://lists.boost.org/mailman/listinfo.cgi/boost-users
>

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