[967] | 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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[1315] | 26 | // $Id: G4CascadeMomentum.hh,v 1.5 2010/03/16 22:10:26 mkelsey Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-04-beta-cand-01 $ |
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[967] | 28 | // |
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| 29 | // Class G4CascadeMomentum |
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| 30 | // |
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| 31 | // Class description: |
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| 32 | // |
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| 33 | // A simple wrapper class meant to replace the widespread use of |
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| 34 | // std::vector<double> in the cascade mode code, which causes |
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| 35 | // problems for performance due to excess memory allocations. |
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[1315] | 36 | // |
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| 37 | // NOTE: The Bertini code does not pass legitimate four-vectors when |
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| 38 | // creating new particles; the new getLV() function takes an |
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| 39 | // optional mass argument (in Bertini units [GeV]) so that a |
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| 40 | // valid G4LorentzVector can be returned. |
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| 41 | // |
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[967] | 42 | // Author: Peter Elmer, Princeton University 7-Aug-2008 |
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[1315] | 43 | // Update: Michael Kelsey, SLAC (support G4LorentzVector) 8-Jan-2010 |
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[967] | 44 | // -------------------------------------------------------------------- |
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| 45 | #ifndef G4CASCADE_MOMENTUM_HH |
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| 46 | #define G4CASCADE_MOMENTUM_HH |
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| 47 | |
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| 48 | #include <cassert> |
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| 49 | |
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| 50 | #include "G4Types.hh" |
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[1315] | 51 | #include "G4LorentzVector.hh" |
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| 52 | #include "G4ThreeVector.hh" |
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[967] | 53 | |
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| 54 | class G4CascadeMomentum |
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| 55 | { |
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| 56 | public: |
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| 57 | G4CascadeMomentum() {for (int i=0; i<4; ++i) data_[i]=0.0;} |
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| 58 | |
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[1315] | 59 | // WARNING! This metric is (t,x,y,z), DIFFERENT FROM HepLV! |
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| 60 | G4CascadeMomentum(const G4LorentzVector& lv) { |
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| 61 | setLV(lv); |
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| 62 | } |
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| 63 | |
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| 64 | G4double& operator[](int i) { |
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[967] | 65 | assert(i>=0 && i<4); |
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| 66 | return data_[i]; |
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| 67 | } |
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[1315] | 68 | const G4double& operator[](int i) const { |
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[967] | 69 | assert(i>=0 && i<4); |
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| 70 | return data_[i]; |
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| 71 | } |
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| 72 | |
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[1315] | 73 | operator const G4LorentzVector&() const { |
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| 74 | return getLV(); // Casting can't do mass repairs |
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| 75 | } |
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| 76 | |
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| 77 | const G4LorentzVector& getLV(G4double mass=-1.) const { |
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| 78 | if (mass>=0.) lv.setVectM(get3V(),mass); // Force input mass! |
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| 79 | else lv.set(data_[1],data_[2],data_[3],data_[0]); |
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| 80 | |
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| 81 | return lv; |
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| 82 | } |
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| 83 | |
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| 84 | G4ThreeVector get3V() const { |
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| 85 | return getLV().vect(); |
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| 86 | } |
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| 87 | |
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| 88 | void setLV(const G4LorentzVector& lv) { |
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| 89 | data_[0] = lv.t(); // NOTE DIFFERENT METRIC CONVENTION! |
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| 90 | data_[1] = lv.x(); |
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| 91 | data_[2] = lv.y(); |
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| 92 | data_[3] = lv.z(); |
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| 93 | } |
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| 94 | |
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| 95 | G4CascadeMomentum& operator=(const G4LorentzVector& lv) { |
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| 96 | setLV(lv); |
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| 97 | return *this; |
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| 98 | } |
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| 99 | |
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[967] | 100 | private: |
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| 101 | G4double data_[4]; |
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[1315] | 102 | mutable G4LorentzVector lv; // Buffer for conversion operations |
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[967] | 103 | }; |
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[1315] | 104 | |
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[967] | 105 | #endif |
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| 106 | |
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