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// $Id: G4MagneticField.hh,v 1.14 2006/06/29 18:23:14 gunter Exp $
// GEANT4 tag $Name: geant4-09-02-cand-01 $
//
//
// class G4MagneticField
//
// Class description:
//
// Magnetic Field abstract class, implements inquiry function interface.

// History:
// - Created. JA, January 13th, 1996.
// --------------------------------------------------------------------

#ifndef G4MAGNETIC_FIELD_DEF
#define G4MAGNETIC_FIELD_DEF

#include "G4Types.hh"
#include "G4ElectroMagneticField.hh"

class G4MagneticField : public G4ElectroMagneticField
{
  public:  // with description

     G4MagneticField();
     virtual ~G4MagneticField();
       // Constructor and destructor. No actions.

     G4MagneticField(const G4MagneticField &r);
     G4MagneticField& operator = (const G4MagneticField &p);
       // Copy constructor & assignment operator.

     G4bool   DoesFieldChangeEnergy() const { return false; }
       //  Since a pure magnetic field does not change track energy

     virtual void  GetFieldValue( const G4double Point[4],
                                        G4double *Bfield ) const = 0;
};

#endif /* G4MAGNETIC_FIELD_DEF */
