include/Geant4/G4ParticleHPPolynomExpansion.hh

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0025 //
0026 //
0027 // P. Arce, June-2014 Conversion neutron_hp to particle_hp
0028 //
0029 #ifndef G4ParticleHPPolynomExpansion_h
0030 #define G4ParticleHPPolynomExpansion_h 1
0031
0032 #include "G4ios.hh"
0033 #include "globals.hh"
0034
0035 #include <CLHEP/Units/SystemOfUnits.h>
0036
0037 #include <fstream>
0038
0039 class G4ParticleHPPolynomExpansion
0040 {
0041   public:
0042     G4ParticleHPPolynomExpansion()
0043     {
0044       theCoeff = nullptr;
0045       nPoly = 0;
0046     }
0047     ~G4ParticleHPPolynomExpansion() { delete[] theCoeff; }
0048
0049     inline void Init(std::istream& theData)
0050     {
0051       theData >> nPoly;
0052       theCoeff = new G4double[nPoly];
0053       G4int i;
0054       for (i = 0; i < nPoly; i++) {
0055         theData >> theCoeff[i];
0056       }
0057     }
0058
0059     inline G4double GetValue(G4double anEnergy)
0060     {
0061       G4int i;
0062       G4double result = 0;
0063       G4double base = anEnergy / CLHEP::eV;
0064       G4double running = 1;
0065       for (i = 0; i < nPoly; i++) {
0066         result += theCoeff[i] * running;
0067         running *= base;
0068       }
0069       return result;
0070     }
0071
0072   private:
0073     G4int nPoly;
0074     G4double* theCoeff;
0075 };
0076
0077 #endif