Import Geant4 4.0.0 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: G4LinInterpolation.cc,v 1.1 2001/11/29 19:01:36 vnivanch Exp $
+// GEANT4 tag $Name: geant4-04-00 $
+//
+// Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
+//
+// History:
+// -----------
+// 31 Jul 2001   MGP        Created
+//
+// -------------------------------------------------------------------
+
+#include "G4LinInterpolation.hh"
+
+// Constructor
+
+G4LinInterpolation::G4LinInterpolation()
+{ }
+
+
+// Destructor
+
+G4LinInterpolation::~G4LinInterpolation()
+{ }
+
+
+G4double G4LinInterpolation::Calculate(G4double x, G4int bin, 
+					  const G4DataVector& points, 
+					  const G4DataVector& data) const
+{
+  G4int nBins = data.size() - 1;
+  G4double value = 0.;
+  if (x < points[0])
+    {
+      value = 0.;
+    }
+  else if (bin < nBins)
+    {
+      G4double e1 = points[bin];
+      G4double e2 = points[bin+1];
+      G4double d1 = data[bin];
+      G4double d2 = data[bin+1];
+      value = d1 + (d2 - d1)*(x - e1)/(e2 - e1);
+    }
+  else
+    {
+      value = data[nBins];
+    }
+  return value;
+}