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List:       boost
Subject:    Re: [boost] GSOC 2013
From:       Michael Marcin <mike.marcin () gmail ! com>
Date:       2013-04-23 22:12:51
Message-ID: kl7110$lq5$1 () ger ! gmane ! org
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On 4/23/13 1:59 PM, Dmitriy Gorbel wrote:
>
> Michael Marcin-3 wrote
>> Still this representation makes sense because it specifies both
>> parameters in terms 2^x. It also supports something like <17,1> to give
>> a 16 bit type that has the range [-131072, 131071] in increments of 2.
>
> If use notation from C++1y proposal,
> I plan that value witch set resolution always be negative,
> and minimal resolution: 2^-1 = 1/2
> I don't plan to implement something like <17,1>.
> You think this is really necessary feature?
>

No but IMO it was the only cool feature that fell out naturally from the 
interface.

Without it I would strongly prefer the fixed< MagnitudeBits, 
FractionalBits > interface.

Which more closely aligns with common fixed-point convention:

http://en.wikipedia.org/wiki/Fixed-point_arithmetic#Notation
http://en.wikipedia.org/wiki/Q_(number_format)
http://en.wikipedia.org/wiki/Binary_scaling


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