Import Geant4 4.1.0 source tree

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+//
+// ********************************************************************
+// * DISCLAIMER                                                       *
+// *                                                                  *
+// * The following disclaimer summarizes all the specific disclaimers *
+// * of contributors to this software. The specific disclaimers,which *
+// * govern, are listed with their locations in:                      *
+// *   http://cern.ch/geant4/license                                  *
+// *                                                                  *
+// * 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.                                                             *
+// *                                                                  *
+// * This  code  implementation is the  intellectual property  of the *
+// * 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: G4WeightWindowAlgorithm.hh,v 1.2 2002/05/30 16:00:55 dressel Exp $
+// GEANT4 tag $Name: geant4-04-01 $
+//
+// ----------------------------------------------------------------------
+// Class G4WeightWindowAlgorithm
+// 
+// Class description:
+// see also G4VWeightWindowAlgorithm.
+//
+
+// Author: Michael Dressel (Michael.Dressel@cern.ch)
+// ----------------------------------------------------------------------
+#ifndef G4WeightWindowAlgorithm_hh
+#define G4WeightWindowAlgorithm_hh G4WeightWindowAlgorithm_hh 
+
+#include "G4Nsplit_Weight.hh"
+#include "G4VWeightWindowAlgorithm.hh"
+
+class G4WeightWindowAlgorithm : public G4VWeightWindowAlgorithm
+{
+
+public:  // with description
+  
+  G4WeightWindowAlgorithm();
+  
+  ~G4WeightWindowAlgorithm(){}
+
+  void SetUpperLimit(G4double Upper);
+    // set upper limiting factor for window
+    // - Upper is the maximum factor by which the weight of a particle may
+    //   be higher than it should be according to the importance
+  
+  void SetLowerLimit(G4double Lower);
+    // set lower limiting facotr for window
+    // - Lower is the minimal factor by which the wight may be
+    //   lower than it should be according to the importance
+
+
+
+  G4Nsplit_Weight Calculate(G4double init_w, 
+			    G4double importance) const;
+    // calculate the number of tracks and their weight according 
+    // to the upper and lower limmiting factors of the window
+    // and the initial weight
+    // - init_w is the initial weight of the particle
+    // - importance is the importance of the cell
+
+private:
+  G4double fUpper;
+  G4double fLower;
+};
+
+#endif