Import Geant4 0.0.0 source tree

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+// 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: G4MagIntegratorStepper.hh,v 2.2 1998/11/10 18:16:48 japost Exp $
+// GEANT4 tag $Name: geant4-00 $
+//
+// Abstract base class (ie Interface)
+// -------------------
+//    for integrator of particle's equation of motion,
+//    used in tracking in space dependent magnetic field
+// -----------------------------------------------------
+//
+// History:
+// 15.01.97  J.Apostolakis (J.Apostolakis@cern.ch)
+
+#ifndef G4MAGIntegratorSTEPPER
+#define G4MAGIntegratorSTEPPER
+#include "globals.hh"
+#include "G4Mag_EqRhs.hh"
+
+class G4MagIntegratorStepper
+{
+  public:
+
+     G4MagIntegratorStepper(G4Mag_EqRhs *EqRhs);
+     ~G4MagIntegratorStepper(){} ;
+
+     //  "Key" methods
+     // ---------------
+     //   The stepper for the Runge Kutta integration. The stepsize 
+     // is fixed, with the Step size given by h.
+     //  Integrates ODE starting values y[0 to 6 ]
+     // Outputs yout[] and its estimated error yerr[].
+
+     virtual  void  Stepper(  const G4double y[],
+			      const G4double dydx[],
+			      const G4double h,
+				    G4double yout[],
+				    G4double yerr[]  ) = 0 ;
+
+     //  Estimate the maximum distance of chord from true path over
+     //    segment last integrated.
+
+     virtual  G4double  DistChord() const = 0; 
+
+
+     // Utility methods
+     // ---------------
+     //  Simple function to (re)normalise 'unit velocity' vector
+     //
+     void NormaliseTangentVector( G4double vec[6] );
+
+     //  Supply the standard Evaluation of the Right Hand side 
+     //   of the associated equation.
+     //
+     virtual void RightHandSide( const  double y[], double dydx[] )   
+	{ theEquation_Rhs-> RightHandSide(y, dydx); }
+
+#if 0
+     //  Supply the standard Evaluation of the Right Hand side 
+     //   of the associated equation.
+     void
+     SetChargeAndMomentum( const G4double particleCharge, // in e+ units
+			   const G4double MomentumXc)
+       { theEquation_Rhs -> SetChargeAndMomentum(particleCharge, MomentumXc);}
+#endif 
+
+     // returns the order of the integrator
+     // i.e. its error behaviour is of the order O(h^order)
+     virtual G4int IntegratorOrder() = 0;
+  
+     //  As some steppers (eg RKG3) require other methods of Eq_Rhs
+     //    the next function allows for access to them.
+     G4EquationOfMotion *GetEquationOfMotion() const; 
+
+  private:
+
+     G4EquationOfMotion *theEquation_Rhs;
+
+};
+
+#include  "G4MagIntegratorStepper.icc"
+
+#endif  /* G4MAGIntegratorSTEPPER */