Re: [boost] Re: new compile-time dimensional analysis and unitlibrary

From: Matthias Schabel (boost_at_[hidden])
Date: 2003-12-09 19:41:30

> Two questions:
> 1) What about something like Radians? I.e.: not strictly a physical  
> dimension, yet which under normal circumstances should not be used  
> like
>  x = 5 radians;
>  y = sin(x) + x; //>:-0

I haven't completely decided what to do about angles.  At the moment I  
include radians and steradians with the SI unit system,
simply because in practice they are often used in conjunction.  I  
haven't put in degrees or gradians because I have no use for them,
but it should be easy to do.  I also haven't defined the trig functions  
to take dimensioned quantities, but again it shouldn't be hard.  Take a  
look at the library and give me some feedback.  You might like the  
demonstration of a completely artificial system of units; check out the  
files ABC_units.hpp, DE_units.hpp, and ABCDE_units.hpp to see how you  
can define your own unit systems pretty easily (he says as the  
implementer ;^)  If you were only interested in angles, you could  
define three units systems which only include angle tags and the  
appropriate conversions and use those.

> 2) Where can I get the updated sources? I only was able to get the  
> original because they were attached to the message. The updated ones,  
> when I click on the yahoo groups link it says that the folder doesn't  
> exist.

Hmmm...strange...anyway, I reattached the zip file to the files section  
and tested that it works.  Whatever the problem, it seems to be fixed.   
If you still have problems, I'll send you a copy direct.

Matthias
------------------------------------------------------------------------ 
---------------------------
Matthias Schabel, Ph.D.                           	
Utah Center for Advanced Imaging Research
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mschabel at ucair med utah edu