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
0043     G4ParticleHPPolynomExpansion()
0044     {
0045       theCoeff = nullptr;
0046       nPoly = 0;
0047     }
0048     ~G4ParticleHPPolynomExpansion() { delete[] theCoeff; }
0049
0050     inline void Init(std::istream& theData)
0051     {
0052       theData >> nPoly;
0053       theCoeff = new G4double[nPoly];
0054       G4int i;
0055       for (i = 0; i < nPoly; i++) {
0056         theData >> theCoeff[i];
0057       }
0058     }
0059
0060     inline G4double GetValue(G4double anEnergy) const
0061     {
0062       G4int i;
0063       G4double result = 0;
0064       G4double base = anEnergy / CLHEP::eV;
0065       G4double running = 1;
0066       for (i = 0; i < nPoly; i++) {
0067         result += theCoeff[i] * running;
0068         running *= base;
0069       }
0070       return result;
0071     }
0072
0073   private:
0074
0075     G4int nPoly;
0076     G4double* theCoeff;
0077 };
0078
0079 #endif