Fraction.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 _Fraction_h
#define _Fraction_h

// Quantity includes
#include "Quantity/Variable.h"
#include "Quantity/Constant.h"
#include "Quantity/QuantityCluster.h"

namespace quantity {
  namespace fraction {

class Class;

class Unit;

/* declaration of Fraction units */
class UnityUnit;
class PercentUnit;
class PermilleUnit;
class PpmUnit;

typedef unit::NonPrefixable<Unit, UnityUnit> Unity;

typedef unit::NonPrefixable<Unit, PercentUnit> Percent;

typedef unit::NonPrefixable<Unit, PermilleUnit> Permille;

typedef unit::NonPrefixable<Unit, PpmUnit> Ppm;

typedef LOKI_TYPELIST_4(Unity, Percent, Permille, Ppm) Units;

/* Fraction quantity */

typedef Quantity<Class> Quantity;

class DerivedFraction;

  } // end namespace fraction


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

template<typename ST> const ST Standard<fraction::Unity, ST>::ratio = 1.0;

template<typename ST> const bool Standard<fraction::Unity, ST>::exact = true;


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

template<typename ST> const ST Standard<fraction::Percent, ST>::ratio = 0.01;

template<typename ST> const bool Standard<fraction::Percent, ST>::exact = true;


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

template<typename ST> const ST Standard<fraction::Ppm, ST>::ratio = 1.0e-6;

template<typename ST> const bool Standard<fraction::Ppm, ST>::exact = true;

template<>
  struct QuantityTraits<fraction::Class>
  {
    typedef
      dimension::Dimension<BSUtilities::Rational<0>,
        BSUtilities::Rational<0>, BSUtilities::Rational<0>,
          BSUtilities::Rational<0>, BSUtilities::Rational<0>,
            BSUtilities::Rational<0>, BSUtilities::Rational<0> > Dimension;
    typedef fraction::Unit UnitType;
    typedef fraction::Units UnitList;
    typedef fraction::Unity DefaultUnit;

    typedef fraction::DerivedFraction DefaultDerivedQuantityType;

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

  };

// the derived quantity traits template for derived Fraction
template<>
  struct DerivedQuantityTraits<fraction::Class, fraction::DerivedFraction>
  {
    static const bool OverwriteName = false;
    static const bool OverwriteSymbol = false;

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

  };

typedef Variable<fraction::Quantity> Fraction;

typedef Constant<fraction::Quantity> FractionConstant;

typedef QuantityVector<Variable, fraction::Quantity> FractionVector;

} // end namespace quantity

#endif /* _Fraction_h */

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