Quantity.h

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#ifndef OME_XML_MODEL_PRIMITIVES_QUANTITY_H
#define OME_XML_MODEL_PRIMITIVES_QUANTITY_H

#include <boost/operators.hpp>

namespace ome
{
  namespace xml
  {
    namespace model
    {
      namespace primitives
      {

        template<class Unit, typename Value = double>
        class Quantity : private boost::partially_ordered<Quantity<Unit, Value>,
                                 boost::equality_comparable<Quantity<Unit, Value>,
                                 boost::addable<Quantity<Unit, Value>,
                                 boost::subtractable<Quantity<Unit, Value>,
                                 boost::dividable2<Quantity<Unit, Value>, Value,
                                 boost::multipliable2<Quantity<Unit, Value>, Value,
                                 boost::incrementable<Quantity<Unit, Value>,
                                 boost::decrementable<Quantity<Unit, Value>>>>>>>>>
        {
        public:
          typedef Unit unit_type;
          typedef Value value_type;

          inline
          Quantity ():
            value(),
            unit(typename unit_type::enum_value(0))
          {
          }

          inline
          Quantity (value_type value,
                    unit_type  unit):
            value(value),
            unit(unit)
          {
          }

          inline
          Quantity(const Quantity& quantity):
            value(quantity.value),
            unit(quantity.unit)
          {
          }

          inline
          ~Quantity ()
          {
          }

          value_type
          getValue() const
          {
            return value;
          }

          unit_type
          getUnit() const
          {
            return unit;
          }

          inline Quantity&
          operator= (const Quantity& quantity)
          {
            this->value = quantity.value;
            this->unit = quantity.unit;
            return *this;
          }

          inline Quantity&
          operator+= (const Quantity& quantity);

          inline Quantity&
          operator-= (const Quantity& quantity);

          inline Quantity&
          operator*= (const value_type& value)
          {
            this->value *= value;
            return *this;
          }

          inline Quantity&
          operator/= (const value_type& value)
          {
            this->value /= value;
            return *this;
          }

          inline Quantity&
          operator%= (const value_type& value)
          {
            this->value %= value;
            return *this;
          }

          inline Quantity&
          operator++ ()
          {
            ++this->value;
            return *this;
          }

          inline Quantity&
          operator-- ()
          {
            --this->value;
            return *this;
          }

          inline bool
          operator< (const Quantity& quantity) const;

          // Note operator> (const Quantity& value) const is
          // provided by Boost.Operators.

          inline bool
          operator== (const Quantity& quantity) const;

        private:
          value_type value;
          unit_type unit;
        };

        template<typename Unit, typename Value>
        struct QuantityConverter
        {
          Quantity<Unit, Value>
          operator() (const Quantity<Unit, Value>&              quantity,
                      typename Quantity<Unit, Value>::unit_type unit) const;
        };

        template<class Unit, typename Value>
        inline
        Quantity<Unit, Value>
        convert(const Quantity<Unit, Value>&              quantity,
                typename Quantity<Unit, Value>::unit_type unit)
        {
          QuantityConverter<Unit, Value> conv;
          return conv(quantity, unit);
        }

        template<class Unit, typename Value>
        inline
        Quantity<Unit, Value>&
        Quantity<Unit, Value>::operator+= (const Quantity<Unit, Value>& quantity)
        {
          this->value += convert(quantity, this->unit).getValue();
          return *this;
        }

        template<class Unit, typename Value>
        inline
        Quantity<Unit, Value>&
        Quantity<Unit, Value>::operator-= (const Quantity<Unit, Value>& quantity)
        {
          this->value -= convert(quantity, this->unit).getValue();
          return *this;
        }

        template<class Unit, typename Value>
        inline
        bool
        Quantity<Unit, Value>::operator< (const Quantity<Unit, Value>& quantity) const
        {
          return this->value < convert(quantity, this->unit).getValue();
        }

        template<class Unit, typename Value>
        inline
        bool
        Quantity<Unit, Value>::operator== (const Quantity<Unit, Value>& quantity) const
        {
          return this->value == convert(quantity, this->unit).getValue();
        }

        template<class charT, class traits, typename Unit, typename Value>
        inline std::basic_ostream<charT,traits>&
        operator<< (std::basic_ostream<charT,traits>& os,
                    const Quantity<Unit, Value>& quantity)
        {
          return os << quantity.getValue() << ' ' << quantity.getUnit();
        }

        template<class charT, class traits, typename Unit, typename Value>
        inline std::basic_istream<charT,traits>&
        operator>> (std::basic_istream<charT,traits>& is,
                    Quantity<Unit, Value>& quantity)
        {
          Value v;
          Unit u(typename Unit::enum_value(0));
          if (is >> v >> u)
            {
              quantity = Quantity<Unit, Value>(v, u);
            }
          return is;
        }

      }
    }
  }
}

#endif // OME_XML_MODEL_PRIMITIVES_QUANTITY_H

/*
 * Local Variables:
 * mode:C++
 * End:
 */