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: G4VWeightWindowAlgorithm.hh,v 1.2 2002/05/30 16:00:55 dressel Exp $
+// GEANT4 tag $Name: geant4-04-01 $
+//
+// ----------------------------------------------------------------------
+// Class G4VWeightWindowAlgorithm
+//
+// Class description:
+// 
+// This is a base class for an algorithm used for 
+// weight window importance sampling. It calculates
+// the new weight of particles and the number of copies
+// it should be split into according to the initial weight 
+// of the track and the importance of the cell. The window
+// is defined by the values of Upper and Lower.
+// 
+//
+
+// Author: Michael Dressel (Michael.Dressel@cern.ch)
+// ----------------------------------------------------------------------
+#ifndef G4VWeightWindowAlgorithm_hh
+#define G4VWeightWindowAlgorithm_hh G4VWeightWindowAlgorithm_hh 
+
+#include "G4Nsplit_Weight.hh"
+
+class G4VWeightWindowAlgorithm
+{
+
+public:  // with description
+
+  virtual ~G4VWeightWindowAlgorithm(){}
+
+  virtual void SetUpperLimit(G4double Upper) = 0;
+    // set upper limiting factor for window
+  
+  virtual void SetLowerLimit(G4double Lower) = 0;
+    // set lower limiting facotr for window
+
+  virtual G4Nsplit_Weight Calculate(G4double init_w, 
+				    G4double importance) const = 0;
+    // calculate the number of tracks and their weight according 
+    // to the upper and lower limmiting factors of the window
+    // and the initial weight
+  
+};
+
+#endif