| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | //
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| 27 | // $Id: G4PhysicsLnVector.hh,v 1.12 2006/06/29 19:02:23 gunter Exp $
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| 28 | // GEANT4 tag $Name: HEAD $
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| 29 | //
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| 30 | //
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| 31 | //--------------------------------------------------------------------
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| 32 | // GEANT 4 class header file
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| 33 | //
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| 34 | // G4PhysicsLnVector.hh
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| 35 | //
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| 36 | // Class description:
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| 37 | //
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| 38 | // A physics vector which has values of energy-loss, cross-section,
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| 39 | // and other physics values of a particle in matter in a given
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| 40 | // range of the energy, momentum, etc. The scale of energy/momentum
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| 41 | // bins is natural logarithmic.
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| 42 | //
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| 43 | // History:
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| 44 | // 27 Apr. 1999, M.G. Pia: Created, copying from G4PhysicsLogVector
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| 45 | // 11 Nov. 2000, H.Kurashige : Use STL vector for dataVector and binVector
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| 46 | //
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| 47 | //--------------------------------------------------------------------
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| 48 |
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| 49 | #ifndef G4PhysicsLnVector_h
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| 50 | #define G4PhysicsLnVector_h 1
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| 51 |
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| 52 | #include "globals.hh"
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| 53 | #include "G4PhysicsVector.hh"
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| 54 |
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| 55 | class G4PhysicsLnVector : public G4PhysicsVector
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| 56 | {
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| 57 | public:
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| 58 |
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| 59 | G4PhysicsLnVector();
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| 60 | explicit G4PhysicsLnVector(size_t theNbin);
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| 61 | // Constructors
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| 62 |
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| 63 | public: // with description
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| 64 |
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| 65 | G4PhysicsLnVector(G4double theEmin, G4double theEmax, size_t theNbin);
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| 66 | // Because of logarithmic scale, note that 'theEmin' has to be
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| 67 | // greater than zero. No protection exists against this error.
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| 68 |
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| 69 | ~G4PhysicsLnVector();
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| 70 | // Destructor.
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| 71 |
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| 72 | G4bool Retrieve(std::ifstream& fIn, G4bool ascii);
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| 73 | // To retrieve persistent data from file stream.
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| 74 |
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| 75 | protected:
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| 76 |
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| 77 | size_t FindBinLocation(G4double theEnergy) const;
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| 78 | // Find bin# in which theEnergy belongs - pure virtual function.
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| 79 |
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| 80 | private:
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| 81 |
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| 82 | G4double dBin; // Bin width - useful only for fixed binning
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| 83 | G4double baseBin; // Set this in constructor for performance
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| 84 |
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| 85 | };
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| 86 |
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| 87 |
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| 88 | inline
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| 89 | size_t G4PhysicsLnVector::FindBinLocation(G4double theEnergy) const
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| 90 | {
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| 91 |
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| 92 | // For G4PhysicsLnVector, FindBinLocation is implemented using
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| 93 | // a simple arithmetic calculation.
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| 94 | //
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| 95 | // Because this is a virtual function, it is accessed through a
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| 96 | // pointer to the G4PhyiscsVector object for most usages. In this
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| 97 | // case, 'inline' will not be invoked. However, there is a possibility
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| 98 | // that the user access to the G4PhysicsLnVector object directly and
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| 99 | // not through pointers or references. In this case, the 'inline' will
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| 100 | // be invoked. (See R.B.Murray, "C++ Strategies and Tactics", Chap.6.6)
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| 101 |
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| 102 | return size_t( std::log(theEnergy)/dBin - baseBin );
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| 103 | }
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| 104 |
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| 105 | #endif
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