Re: [boost] Re: physical-quantities (was: runtime unit-modifiable ...)

From: Matthias Schabel (boost_at_[hidden])
Date: 2004-01-07 17:03:01

> My major Major criticism of all the other units libs is "Heres My Great
> Lib..."
> then  there are a couple of  headers of  template code
> followed by   'Oh ...BTW... you have to define your own units... dont  
> worry
> it'll be no problem' .
> My reaction as a user is ... What the ( expletive deleted)  is this (
> expletive deleted)  ?

I'm going to assume that you either a) haven't bothered to look at the  
example program I provide with YANL or b) don't mean to include it in  
your "all the other units libs" category as it already (and has pretty  
much from the outset) fully supports all common SI units as well as a  
subset of the CGS unit system.  For example, this code works as  
expected :

template<class Y>
dimensioned_quantity<Y,dimensioned_unit<si_model,quantity_type> >
idealGasLaw(dimensioned_quantity<Y,dimensioned_unit<si_model,pressure_ty 
pe> > P,
                           
dimensioned_quantity<Y,dimensioned_unit<si_model,volume_type> > V,
                           
dimensioned_quantity<Y,dimensioned_unit<si_model,temperature_type> > T)
{
     return (P*V/(8.314*(_joules/(_kelvin*_mole))*T));
}

     // test ideal gas law
     SI<double>::temperature    T = (273.+37.)*_kelvin;
     SI<double>::pressure       P = 1.01325e5*_pascals;
     SI<double>::length         r = 0.5e-6*_meters;
     SI<double>::volume         V = (4.0/3.0)*3.141592*power<3>(r);
     SI<double>::quantity       n(idealGasLaw(P,V,T));

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