Re: [boost] New Boost.XInt Library, request preliminary review

Subject: Re: [boost] New Boost.XInt Library, request preliminary review
From: Chad Nelson (chad.thecomfychair_at_[hidden])
Date: 2010-04-07 16:54:55

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On 04/07/2010 02:30 PM, DE wrote:

> i may misunderstand all this so better see e.g.
> http://en.wikipedia.org/wiki/Two's_complement

Thanks, I glanced through it to refresh my memory.

> i suggest to pack the sign in the MSB of the most significant digit to
> get rid of the bool
> it still would be a sign-magnitude representation
> 
> so retrievel would be like
> 
>   digits[n_digits - 1]&(1<<15)/*==0*/
> 
> but perhaps you would need to set that bit to 0 during some operations
> which involves some additional overhead

Since the savings would be minimal, and it would increase the overhead
(even more than you mentioned), I don't think it's worth it.
- -- 
Chad Nelson
Oak Circle Software, Inc.
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