Gabriele Cosmo
105 lines
3.6 KiB
C++
105 lines
3.6 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: G4PhysicsFreeVector.hh,v 1.2 1999/11/16 17:40:40 gcosmo Exp $
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// GEANT4 tag $Name: geant4-01-01 $
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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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// G4PhysicsFreeVector.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 in free, ie. it is NOT need to be linear or log. Only
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// restrication is that bin values alway have to increase from
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// a lower bin to a higher bin. This is necessary for the binary
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// search to work correctly.
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// History:
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// 02 Dec. 1995, G.Cosmo : Structure created based on object model
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// 06 Jun. 1996, K.Amako : Implemented the 1st version
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// 01 Jul. 1996, K.Amako : Cache mechanism and hidden bin from the
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// user introduced.
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// 26 Sep. 1996, K.Amako : Constructor with only 'bin size' added.
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//
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//--------------------------------------------------------------------
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#ifndef G4PhysicsFreeVector_h
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#define G4PhysicsFreeVector_h 1
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#include "globals.hh"
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#include "G4DataVector.hh"
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#include "G4PhysicsVector.hh"
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class G4PhysicsFreeVector : public G4PhysicsVector
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{
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public:
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// Constructors
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G4PhysicsFreeVector();
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G4PhysicsFreeVector(size_t theNbin);
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G4PhysicsFreeVector(const G4DataVector& binVector,
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const G4DataVector& dataVector);
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// 'binVector' has the low edge value of each scale bin.
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// 'dataVector' has the cross-section/energy-loss/etc at
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// the energy/momenturm of the corresponding a bin of
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// 'binVector'. 'binVector' and 'dataVector' need to have
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// the same vector length.
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// Destructor
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~G4PhysicsFreeVector();
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// Special PutValue function for PhysicsFreeVector
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void PutValue( size_t binNumber, G4double binValue,
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G4double dataValue );
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// To use this method to fill a PhysicsFreeVector, you have
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// to Construct a PhysicsFreeVector of the size you need
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// using G4PhysicsFreeVector(size_t theNbin). Also take
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// note that you have to fill all bin values and data
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// values before you the PhysicsFreeVector.
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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 - virtual function
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};
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inline size_t G4PhysicsFreeVector::FindBinLocation(G4double theEnergy) const
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{
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// For G4PhysicsFreeVector, FindBinLocation is implemented using
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// the binary search algorithm.
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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 G4PhysicsFreeVector 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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size_t lowerBound = 0;
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size_t upperBound = numberOfBin-1;
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do {
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size_t midBin = (lowerBound + upperBound)/2;
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if( theEnergy < binVector(midBin) )
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upperBound = midBin-1;
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else
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lowerBound = midBin+1;
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} while (lowerBound <= upperBound);
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return upperBound;
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}
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#endif
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