[boost] Re: [constant] New version + YANL-example available

From: Andy Little (andy_at_[hidden])
Date: 2004-01-24 17:34:51

"Daniel Frey" <d.frey_at_[hidden]> wrote

> I uploaded the new version of the constant library to the files section.
> Additionally, I added an example which shows how it can be used with a
> unit library, e.g. YANL 2.2. The constant library itself is independent
> of the unit library, and I hope that it can be transfered to the other
> unit libraries as well. A short appetizer:

[example of constant use]

I've had a look but am a bit baffled as to how I go about constructing this
beast for my pqs library.
pqs is not like YANL !

Nevertheless If you wish to try it out :

http://groups.yahoo.com/group/boost/files/pqs/pqs-1-00-02.zip
http://groups.yahoo.com/group/boost/files/pqs/pqs-1-00-02.tar.gz

My current method to do something like this in pqs is attached. Heres the
main source: (both constants could use default params of course)

regards
Andy Little

#include "../pqs.hpp"
#include "math_constants.hpp"
#include "ideal_gas_constant.hpp"
using namespace physical_quantities;

int main()
{
  // a bubble of gas in a resin cure
  q_length::m   const   r(0.5e-6);
  q_volume::m3  const    V
    = 4.0/3.0 * math::constants<>::pi * power<3>(r);

  //setting at room temperature and pressure
  q_temperature::K  T(310);
  q_pressure::Pa    P(1.01325e5);

  // The resin sets.
  // The bubble contains a constant
  // molar quantity of gas.
  q_substance::mol const subst
    = P * V /(physics::ideal_gas_constant<>::R * T);

  //the temperature is subsequently reduced
  // near to absolute zero
  T = q_temperature::K(0.001);

  //what is the pressure in the bubble now?
  P = subst * physics::ideal_gas_constant<>::R * T / V;
  std::cout << P <<'\n';
}

begin 666 gas_constants.txt
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`
end