// This code implementation is the intellectual property of
// the RD44 GEANT4 collaboration.
//
// By copying, distributing or modifying the Program (or any work
// based on the Program) you indicate your acceptance of this statement,
// and all its terms.
//
// $Id: G4Field.hh,v 1.1 1999/01/07 16:07:02 gunter Exp $
// GEANT4 tag $Name: geant4-00-01 $
//
//
//  G4Field:
//    abstract class for any kind of Field, 
//    It allows any kind of field (vector, scalar, tensor and any set of them)
//     to be defiend by implementing the inquiry function interface.
//
// Created:  John Apostolakis, 10.03.1997
// Modified: 

#ifndef G4FIELD_HH
#define G4FIELD_HH

class G4Field
{
  public:
      virtual void  GetFieldValue( const  double Point[3],
					  double *Bfield ) const = 0;
      G4Field(){};
      virtual ~G4Field(){};

     //  A field signature function that can be used to insure
     // that the Equation of motion object and the G4Field object
     //  have the same "field signature"?
};


#endif /* G4FIELD_HH */