Units.h

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// $Id: Units.h,v 1.23 2007/10/09 18:25:58 abeard Exp $

#ifndef CARMA_SERVICES_UNITS_H
#define CARMA_SERVICES_UNITS_H

#include <limits>
#include <string>

struct unittype;


namespace carma  {
  namespace services {
    
    class Units {
    public:
      Units();
      virtual ~Units();

      double convert(const char * convertFrom,
                     const char * convertTo) const;

      double convert(const std::string& convertFrom,
                     const std::string& convertTo) const;

      double convert(double       value,
                     const char * convertFrom,
                     const char * convertTo) const;

      double convert(double       value,
                     const std::string& convertFrom,
                     const std::string& convertTo) const;

      template < typename T >
      int numericLimit( ) {
          ::std::numeric_limits< T > limit;
          
          return static_cast< int >(floor(0.5 +log10(1/limit.epsilon())));
      }

      inline double tera() const {return(convert("tera", ""));}

      inline double giga() const {return(convert("giga", ""));}

      inline double mega() const {return(convert("mega", ""));}

      inline double kilo() const {return(convert("kilo", ""));}

      inline double hecto() const {return(convert("hecto", ""));}

      inline double deca() const {return(convert("deca", ""));}

      inline double deci() const {return(convert("deci", ""));}

      inline double centi() const {return(convert("centi", ""));}

      inline double milli() const {return(convert("milli", ""));}

      inline double micro() const {return(convert("micro", ""));}

      inline double nano() const {return(convert("nano", ""));}

      inline double pico() const {return(convert("pico", ""));}
      
    private:
      bool reciprocalHoldingMasterLock(
        struct unittype * fromUnit,
        struct unittype * toUnit,
        struct unittype * inverseFromUnit) const;
    };
  }
}

#endif //CARMA_SERVICES_UNITS_H