Import Geant4 9.0.0 source tree

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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.          *
+// ********************************************************************
+//
+//
+// $Id: G4ErrorPropagationNavigator.hh,v 1.1 2007/05/16 12:49:18 gcosmo Exp $
+// GEANT4 tag $Name: geant4-09-00 $
+//
+//
+// --------------------------------------------------------------------
+//      GEANT 4 class header file 
+// --------------------------------------------------------------------
+//
+// Class Description:
+//
+// Class for performing double navigation in the detector geometry and
+// on the target surface for error propagation. It overloads ComputeStep()
+// and ComputeSafety() methods.
+
+// History:
+// - Created. P. Arce, September 2004
+// --------------------------------------------------------------------
+
+#ifndef G4ErrorPropagationNavigator_hh
+#define G4ErrorPropagationNavigator_hh
+
+#include "G4Navigator.hh"
+#include "G4ThreeVector.hh"
+
+class G4ErrorPropagationNavigator : public G4Navigator
+{
+  public:  // with description
+
+    G4ErrorPropagationNavigator();
+   ~G4ErrorPropagationNavigator();
+  
+    G4double ComputeStep (const G4ThreeVector &pGlobalPoint,
+                          const G4ThreeVector &pDirection,
+                          const G4double pCurrentProposedStepLength,
+                          G4double &pNewSafety);
+      // Calls the navigation in the detector geometry and then checks
+      // if the distance to surface is smaller than the proposed step
+
+    G4double ComputeSafety(const G4ThreeVector &globalpoint,
+                           const G4double pProposedMaxLength = DBL_MAX);
+      // Calls the navigation in the detector geometry and then checks
+      // if the distance to surface is smaller than the proposed safety
+
+};
+
+#endif