GasConstant.h

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/* Copyright (C) 2002 - 2009, Bernd Speiser */

/* This file is part of Quantities.

PhysicalQuantities is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

PhysicalQuantities is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
  
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.
*/

#ifndef _GasConstant_h
#define _GasConstant_h

// Quantity includes
#include "Quantity/UniqueConstant.h"
#include "PhysicalQuantities/AmountOfSubstance.h"
#include "PhysicalQuantities/Energy.h"
#include "PhysicalQuantities/ThermodynamicTemperature.h"

namespace quantity {
  namespace gasConstant {

class Class;

class Unit;

/* the JoulePerKelvinMole and prefixed variants */

typedef LOKI_TYPELIST_1(energy::Joule) EnergyList;

typedef unit::ComposeElement<Unit, EnergyList,
                               BSUtilities::Rational<1> > EnergyElement;

typedef LOKI_TYPELIST_2(amountOfSubstance::Mole,
                    amountOfSubstance::MilliMole) AmountOfSubstanceList;

typedef unit::ComposeElement<Unit, AmountOfSubstanceList,
                   BSUtilities::Rational<-1> > AmountOfSubstanceElement;

typedef LOKI_TYPELIST_1(thermodynamicTemperature::Kelvin) 
                                           ThermodynamicTemperatureList;

typedef 
  unit::ComposeElement<Unit, ThermodynamicTemperatureList,
            BSUtilities::Rational<-1> > ThermodynamicTemperatureElement;

typedef unit::ComposeBase<Unit, 
  LOKI_TYPELIST_3(EnergyElement, AmountOfSubstanceElement, 
              ThermodynamicTemperatureElement)> GasConstantComposedUnit;

typedef unit::Composed<GasConstantComposedUnit, 
  LOKI_TYPELIST_3(energy::Joule, amountOfSubstance::Mole, 
                  thermodynamicTemperature::Kelvin)> JoulePerKelvinMole;

typedef LOKI_TYPELIST_1(JoulePerKelvinMole) Units;

/* GasConstant quantity */

typedef Quantity<Class> Quantity;

class DerivedGasConstant;

  } // end namespace gasConstant


  template<typename ST>
    struct Standard<gasConstant::GasConstantComposedUnit, ST>
    {
      static const ST ratio;
      static const bool exact;
    };

template<typename ST> const ST Standard<gasConstant::GasConstantComposedUnit, ST>::ratio
                                                                                       = 1.0;

template<typename ST> const bool Standard<gasConstant::GasConstantComposedUnit, ST>::exact
                                                                                       = true;

template<>
  struct QuantityTraits<gasConstant::Class>
  {
    typedef
      dimension::Dimension<BSUtilities::Rational<2>,
        BSUtilities::Rational<1>, BSUtilities::Rational<-2>,
          BSUtilities::Rational<0>, BSUtilities::Rational<-1>,
            BSUtilities::Rational<-1>, BSUtilities::Rational<0> > Dimension;
    typedef gasConstant::Unit UnitType;
    typedef gasConstant::Units UnitList;
    typedef gasConstant::JoulePerKelvinMole DefaultUnit;

    typedef gasConstant::DerivedGasConstant DefaultDerivedQuantityType;

    static const std::string NameString;
    static const std::string SymbolString;

  };

// the derived quantity traits template for joule per Kelvin mole gas constant
template<>
  struct DerivedQuantityTraits<gasConstant::Class, gasConstant::DerivedGasConstant>
  {
    static const bool OverwriteName = false;
    static const bool OverwriteSymbol = false;

    static const std::string NameString;
    static const std::string SymbolString;

  };


typedef Loki::SingletonHolder<UniqueConstant <gasConstant::Quantity> > GasConstant;

#define GASCONSTANT GasConstant::Instance()

} // end namespace quantity

#endif /* _GasConstant_h */

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