[boost] Re: runtime unit-modifiablephysical-quantitiesusingpqs1-00-01

From: Daniel Frey (daniel.frey_at_[hidden])
Date: 2004-01-05 05:31:40

Dan W. wrote:
> Start again.  You'll get the right thing done in a snap, now.  ;-)
> 
> Simplest solution that could possibly work, but no simpler than the 
> simplest solution to *use*:
> 
> using boost::unit_system::dimensions;
> 
> dim length;
> dim time;
> dim speed;
> dim hertz;

Wait! I think the above mixes up some important concepts. Look at this:

length     <-> meter
time       <-> hour
speed      <-> mph
frequency  <-> hertz

I hope you see what I mean. 'hertz' is IMHO totally different than 
length, time or speed.

Speaking in C++, I think that length, time, speed and *frequency* are 
the (C++-)type, where meter, hour, mph and *hertz* are constants of the 
corresponding type. This is also important if it comes to different 
systems and conversions. SI-units like meters and other system using 
miles, feet or whatever all represent lengths.

Regards, Daniel

-- 
Daniel Frey
aixigo AG - financial solutions & technology
Schloß-Rahe-Straße 15, 52072 Aachen, Germany
fon: [phone], fax: [phone]
eMail: daniel.frey_at_[hidden], web: http://www.aixigo.de