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  #ifndef UTILITIES_UNITS_WHUNIT_IMPL_HPP
  #define UTILITIES_UNITS_WHUNIT_IMPL_HPP
  
  #include "../UtilitiesAPI.hpp"
  #include "Unit_Impl.hpp"
  
  namespace openstudio {
  namespace detail {
  
    /** WhUnit_Impl is a Unit_Impl that is the implementation class for WhUnit.*/
    class UTILITIES_API WhUnit_Impl : public Unit_Impl {
     public:
      /** @name Constructors and Destructors */
      //@{
  
      /** Default constructor. Example: \verbatim
          WhUnit myEnergy(WhExpnt(1,1),3,"Wh");
          std::cout << myEnergy; // produces "kWh" \endverbatim
       *
       *  \param[in] exponents holds the exponents for each base unit.
       *  \param[in] scaleExponent exponent for scale. For instance 3 for kilo.
       *  \param[in] prettyString optional string to use in place of standardString. */
      WhUnit_Impl(const WhExpnt& exponents=WhExpnt(),
                  int scaleExponent=0,
                  const std::string& prettyString="");
  
      /** Alternate constructor. Specify the abbreviation of the scale, rather than its
       *  exponent. Example: \verbatim
          WhUnit myEnergy("k",WhExpnt(1,1),"Wh");
          std::cout << myEnergy; // produces "kWh" \endverbatim
       *
       *  \param[in] scaleAbbreviation is string equal to a scale abbreviation. For instance
       *    "k" for kilo.
       *  \param[in] exponents holds the exponents for each base unit.
       *  \param[in] prettyString optional string to use in place of standardString. */
      WhUnit_Impl(const std::string& scaleAbbreviation,
                  const WhExpnt& exponents=WhExpnt(),
                  const std::string& prettyString="");
  
      virtual ~WhUnit_Impl() {}
  
      /** Deep copy constructor. */
      virtual Unit clone() const override;
  
      //@}
      /** @name Base Units and Scale */
      //@{
  
      /** Throws if baseUnit is not a valid for WhUnit. */
      virtual void setBaseUnitExponent(const std::string& baseUnit, int exponent) override;
  
      //@}
     private:
      REGISTER_LOGGER("openstudio.units.WhUnit");
    };
  
  } // detail
  
  } // openstudio
  
  #endif // UTILITIES_UNITS_WHUNIT_IMPL_HPP
  
  