Gabriele Cosmo
106 lines
4.0 KiB
C++
106 lines
4.0 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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// $Id: G4PhysicsLnVector.hh,v 1.12 2006/06/29 19:02:23 gunter Exp $
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// GEANT4 tag $Name: geant4-09-01 $
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//
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//
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//--------------------------------------------------------------------
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// GEANT 4 class header file
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//
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// G4PhysicsLnVector.hh
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//
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// Class description:
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//
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// A physics vector which has values of energy-loss, cross-section,
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// and other physics values of a particle in matter in a given
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// range of the energy, momentum, etc. The scale of energy/momentum
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// bins is natural logarithmic.
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//
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// History:
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// 27 Apr. 1999, M.G. Pia: Created, copying from G4PhysicsLogVector
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// 11 Nov. 2000, H.Kurashige : Use STL vector for dataVector and binVector
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//
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//--------------------------------------------------------------------
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#ifndef G4PhysicsLnVector_h
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#define G4PhysicsLnVector_h 1
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#include "globals.hh"
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#include "G4PhysicsVector.hh"
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class G4PhysicsLnVector : public G4PhysicsVector
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{
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public:
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G4PhysicsLnVector();
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explicit G4PhysicsLnVector(size_t theNbin);
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// Constructors
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public: // with description
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G4PhysicsLnVector(G4double theEmin, G4double theEmax, size_t theNbin);
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// Because of logarithmic scale, note that 'theEmin' has to be
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// greater than zero. No protection exists against this error.
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~G4PhysicsLnVector();
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// Destructor.
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G4bool Retrieve(std::ifstream& fIn, G4bool ascii);
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// To retrieve persistent data from file stream.
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protected:
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size_t FindBinLocation(G4double theEnergy) const;
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// Find bin# in which theEnergy belongs - pure virtual function.
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private:
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G4double dBin; // Bin width - useful only for fixed binning
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G4double baseBin; // Set this in constructor for performance
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};
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inline
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size_t G4PhysicsLnVector::FindBinLocation(G4double theEnergy) const
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{
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// For G4PhysicsLnVector, FindBinLocation is implemented using
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// a simple arithmetic calculation.
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//
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// Because this is a virtual function, it is accessed through a
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// pointer to the G4PhyiscsVector object for most usages. In this
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// case, 'inline' will not be invoked. However, there is a possibility
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// that the user access to the G4PhysicsLnVector object directly and
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// not through pointers or references. In this case, the 'inline' will
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// be invoked. (See R.B.Murray, "C++ Strategies and Tactics", Chap.6.6)
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return size_t( std::log(theEnergy)/dBin - baseBin );
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}
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#endif
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