[833] | 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: $ |
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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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