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

From: Mauricio Gomes (mg_at_[hidden])
Date: 2005-04-16 22:12:03

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.
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