Gabriele Cosmo
87 lines
2.6 KiB
C++
87 lines
2.6 KiB
C++
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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// $Id: G4PhysicsLnVector.hh,v 1.7 2001/03/09 12:08:18 gcosmo Exp $
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// GEANT4 tag $Name: geant4-03-01 $
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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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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(G4std::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( log(theEnergy)/dBin - baseBin );
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}
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#endif
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