Distance.h

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// $Id: Distance.h,v 1.7 2004/10/03 19:46:28 mpound Exp $

#ifndef CARMA_SERVICES_DISTANCE_H
#define CARMA_SERVICES_DISTANCE_H

#include "carma/services/ConformableQuantity.h"
#include "carma/services/Length.h"
#include "carma/services/Angle.h"
#include <iostream>
#include <string>

namespace carma  {
  namespace services {
      class Distance : public Length {
        public:

            Distance(double value, const std::string& units);

            virtual ~Distance();
            

            const Angle getParallax() const; 

            static Distance getDistance(const Angle& parallax);

            /*
             * @return True if this represents an ''infinite'' distance.
             * That is, it is far away enough that there is no
             * parallax.  The CARMA convention is that (distance == 0) 
             * means infinite.
             */
            bool isInfinite() const;

            const Distance operator+(const Distance& distance) const;

            const Distance operator-(const Distance& distance) const;

            Distance &operator+=(const Distance &distance);

            Distance &operator-=(const Distance &distance);

      };
      std::ostream& operator<<(std::ostream& os, 
                               const carma::services::Distance& distance);

  }
}


#endif //CARMA_SERVICES_DISTANCE_H