Re: [boost] [units] conversion performance

From: Matthias Schabel (boost_at_[hidden])
Date: 2007-02-12 16:24:52

> Unless some precision benefit accrues from
> multiplying the factors for each dimension
> individually, it would be better to compute
> the complete factor for the conversion once

[snip]

Good point - I don't think there's a precision issue, but I should  
think about
it some more. I'll take a look at this later this evening. I guess it  
can be rendered down
even more:

     static
     quantity<unit<System2,Dim1>,Y>
     convert(const quantity<unit<System1,Dim1>,Y>& source)
     {
         static Y fac(compute_factor());

         return quantity<unit<System2,Dim1>,Y>::from_value 
(source.value()*fac);
     }