Import Geant4 11.0.0 source tree

2021-12-10 14:46:44 +01:00
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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
+// *                                                                  *
+// * The  Geant4 software  is  copyright of the Copyright Holders  of *
+// * the Geant4 Collaboration.  It is provided  under  the terms  and *
+// * conditions of the Geant4 Software License,  included in the file *
+// * LICENSE and available at  http://cern.ch/geant4/license .  These *
+// * include a list of copyright holders.                             *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.  Please see the license in the file  LICENSE  and URL above *
+// * for the full disclaimer and the limitation of liability.         *
+// *                                                                  *
+// * This  code  implementation is the result of  the  scientific and *
+// * technical work of the GEANT4 collaboration.                      *
+// * By using,  copying,  modifying or  distributing the software (or *
+// * any work based  on the software)  you  agree  to acknowledge its *
+// * use  in  resulting  scientific  publications,  and indicate your *
+// * acceptance of all terms of the Geant4 Software license.          *
+// ********************************************************************
+//
+// TrackingManagerHelper
+//
+// Class description:
+//
+// Helper class for reducing the effort required to implement a custom tracking
+// manager. It implements a stepping loop that calls user actions as the generic
+// tracking and stepping managers do, and it implements navigation for charged
+// particles in energy-preserving fields and for neutral particles.
+//
+// Original author: Jonas Hahnfeld, 2021
+
+#ifndef TrackingManagerHelper_hh
+#define TrackingManagerHelper_hh 1
+
+#include "G4TrackVector.hh"
+#include "globals.hh"
+
+class G4Step;
+class G4Track;
+
+class TrackingManagerHelper
+{
+ public:
+  class Physics
+  {
+   public:
+    virtual void StartTracking(G4Track*) {}
+    virtual void EndTracking() {}
+
+    // Combines AlongStep and PostStep; the implementation needs to remember
+    // the right value to pass as previousStepSize to G4VProcess.
+    virtual G4double GetPhysicalInteractionLength(const G4Track& track) = 0;
+
+    // This method is called for every step after navigation. The updated
+    // position is stored in the G4Step's post-step point. Any particle change
+    // should be applied directly to the step, UpdateTrack() will be called
+    // automatically after this method returns. If secondaries should be given
+    // back to the G4EventManager, put them into the container passed as the
+    // last argument.
+    virtual void AlongStepDoIt(G4Track& track, G4Step& step,
+                               G4TrackVector& secondaries) = 0;
+
+    // This method is called unless the track has been killed during this step.
+    // If secondaries should be given back to the G4EventManager, put them into
+    // the container passed as the last argument.
+    virtual void PostStepDoIt(G4Track& track, G4Step& step,
+                              G4TrackVector& secondaries) = 0;
+
+    virtual bool HasAtRestProcesses() { return false; }
+
+    // This method is called when a track is stopped, but still alive. If
+    // secondaries should be given back to the G4EventManager, put them into
+    // the container passed as the last argument.
+    virtual void AtRestDoIt(G4Track& track, G4Step& step,
+                            G4TrackVector& secondaries)
+    {
+      (void) track;
+      (void) step;
+      (void) secondaries;
+    }
+  };
+
+  class Navigation
+  {
+   public:
+    virtual G4double MakeStep(G4Track& track, G4Step& step,
+                              G4double physicalStep) = 0;
+
+    virtual void FinishStep(G4Track& track, G4Step& step) = 0;
+  };
+
+  template <typename PhysicsImpl, typename NavigationImpl>
+  static void TrackParticle(G4Track* aTrack, PhysicsImpl& physics,
+                            NavigationImpl& navigation);
+
+  template <typename PhysicsImpl>
+  static void TrackChargedParticle(G4Track* aTrack, PhysicsImpl& physics);
+
+  template <typename PhysicsImpl>
+  static void TrackNeutralParticle(G4Track* aTrack, PhysicsImpl& physics);
+};
+
+#include "TrackingManagerHelper.icc"
+
+#endif