SOURCE Peder Holt <peder.holt@[...].com>  writes:

>  What should we do about the accuracy of double_ operations?
> 
>  The implementation of plus,minus,times and divide mimics the behaviour
>  of the runtime equivalent, double. 

On which implementation of C++?

>  This means that the mantissa is trunkated from 61 to 52 bit for
>  every fundamental operation. The result of this, is that complex
>  functions such as sine and exponential will differ from their
>  runtime counterpart, unless a specialization is made for
>  double_. The problem would disappear if we allow calculations with
>  double_ to be more accurate than calculations with double. Is this a
>  problem?

It doesn't sound like your correspondence with runtime results can
possibly be portable anyway, can it?

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com

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