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// $Id: G4NeutronHPPolynomExpansion.hh,v 1.11 2007/06/06 12:45:13 ahoward Exp $
// GEANT4 tag $Name: geant4-09-03 $
//
#ifndef G4NeutronHPPolynomExpansion_h
#define G4NeutronHPPolynomExpansion_h 1

#include "globals.hh"
#include "G4ios.hh"
#include <fstream>

class G4NeutronHPPolynomExpansion
{
  public:
  G4NeutronHPPolynomExpansion()
  {
    theCoeff = 0;
    nPoly=0;
  }
  ~G4NeutronHPPolynomExpansion()
  {
    if(theCoeff!=0) delete [] theCoeff;
  }
  
  inline void Init(std::ifstream & theData)
  {
    theData >> nPoly;
    theCoeff = new G4double[nPoly];
    G4int i;
    for(i=0;i<nPoly;i++)
    {
      theData >> theCoeff[i];
    }
  }
  
  inline G4double GetValue(G4double anEnergy) 
  {
    G4int i;
    G4double result=0;
    G4double base = anEnergy/eV;
    G4double running = 1;
    for(i=0; i<nPoly; i++)
    {
      result+=theCoeff[i]*running;
      running *= base;
    }
    return result;
  }
  private:
  
  G4int nPoly;
  G4double * theCoeff;
};

#endif
