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// ********************************************************************
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//
// $Id: G4Pow.cc,v 1.2 2009/07/03 11:35:06 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-03 $
//
// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:     G4Pow
//
// Author:        Vladimir Ivanchenko
//
// Creation date: 23.05.2009
//
// -------------------------------------------------------------------

#include "G4Pow.hh"

G4Pow* G4Pow::fInstance = 0;

// -------------------------------------------------------------------

G4Pow* G4Pow::GetInstance()
{
  if (fInstance == 0)
  {
    static G4Pow manager;
    fInstance = &manager;
  }
  return fInstance;
}

// -------------------------------------------------------------------

G4Pow::G4Pow()
{
  const G4int maxZ = 256; 

  pz13.resize(maxZ,0.0);
  lz.resize(maxZ,0.0);
  fact.resize(maxZ,0.0);

  onethird = 1.0/3.0;
  G4double f = 1.0;

  for(G4int i=1; i<maxZ; i++)
  {
    G4double x  = G4double(i);
    pz13[i] = std::pow(x,onethird);
    lz[i]   = std::log(x);
    f      *= x;
    fact[i] = f;
  }
  fact[0] = 1.0;
}

// -------------------------------------------------------------------

G4Pow::~G4Pow()
{}

// -------------------------------------------------------------------