Re: [boost] fixed pt binary lib

From: Anthony Williams (anthony.ajw_at_[hidden])
Date: 2008-08-01 04:52:04

"John C. Femiani" <john.femiani_at_[hidden]> writes:

> Anthony Williams wrote:
>> "John C. Femiani" <john.femiani_at_[hidden]> writes:
>>   
>>> Also, do your implementations for /= and *= actually round? You
>>> actually seem to be using the round policy for conversions, is that
>>> right? Have you looked at the numeric/conversion stuff? (I haven't
>>> grokked it yet).
>>>     
>>
>> The division throws away the lower "frac_bits" of the result:
> So why doesn't it use the rounding policy? I kind of expect it to be
> used anytime quantization occurs.

I'll leave Neal to answer that (it's his code), but getting division
right is a pain.  If you followed the link to my code, you'll see that
correct division is not trivial.

Anthony
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