1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // $Id: G4Pow.cc,v 1.2 2009/07/03 11:35:06 vnivanch Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-03 $ |
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28 | // |
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29 | // ------------------------------------------------------------------- |
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30 | // |
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31 | // GEANT4 Class file |
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32 | // |
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33 | // |
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34 | // File name: G4Pow |
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35 | // |
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36 | // Author: Vladimir Ivanchenko |
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37 | // |
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38 | // Creation date: 23.05.2009 |
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39 | // |
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40 | // ------------------------------------------------------------------- |
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41 | |
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42 | #include "G4Pow.hh" |
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43 | |
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44 | G4Pow* G4Pow::fInstance = 0; |
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45 | |
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46 | // ------------------------------------------------------------------- |
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47 | |
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48 | G4Pow* G4Pow::GetInstance() |
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49 | { |
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50 | if (fInstance == 0) |
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51 | { |
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52 | static G4Pow manager; |
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53 | fInstance = &manager; |
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54 | } |
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55 | return fInstance; |
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56 | } |
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57 | |
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58 | // ------------------------------------------------------------------- |
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59 | |
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60 | G4Pow::G4Pow() |
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61 | { |
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62 | const G4int maxZ = 256; |
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63 | |
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64 | pz13.resize(maxZ,0.0); |
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65 | lz.resize(maxZ,0.0); |
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66 | fact.resize(maxZ,0.0); |
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67 | |
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68 | onethird = 1.0/3.0; |
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69 | G4double f = 1.0; |
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70 | |
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71 | for(G4int i=1; i<maxZ; i++) |
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72 | { |
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73 | G4double x = G4double(i); |
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74 | pz13[i] = std::pow(x,onethird); |
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75 | lz[i] = std::log(x); |
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76 | f *= x; |
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77 | fact[i] = f; |
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78 | } |
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79 | fact[0] = 1.0; |
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80 | } |
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81 | |
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82 | // ------------------------------------------------------------------- |
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83 | |
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84 | G4Pow::~G4Pow() |
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85 | {} |
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86 | |
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87 | // ------------------------------------------------------------------- |
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