| Geant4 Cross Reference |
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
25 //
26 /// \file eventgenerator/HepMC/HepMCEx01/src/HEPEvtcom.cc
27 /// \brief Implementation of the HEPEvtcom class
28 //
29 //
30 // ======================================================================
31 // PARAMETER (NMXHEP=4000)
32 // COMMON/HEPEVT/NEVHEP,NHEP,ISTHEP(NMXHEP),IDHEP(NMXHEP),
33 // & JMOHEP(2,NMXHEP),JDAHEP(2,NMXHEP),PHEP(5,NMXHEP),VHEP(4,NMXHEP)
34 // ======================================================================
35 ///**********************************************************/
36 ///* D E S C R I P T I O N : */
37 ///*--------------------------------------------------------*/
38 ///* NEVHEP - event number (or some special meaning*/
39 ///* (see documentation for details) */
40 ///* NHEP - actual number of entries in current */
41 ///* event. */
42 ///* ISTHEP[IHEP] - status code for IHEP'th entry - see */
43 ///* documentation for details */
44 ///* IDHEP [IHEP] - IHEP'th particle identifier according*/
45 ///* to PDG. */
46 ///* JMOHEP[IHEP][0] - pointer to position of 1st mother */
47 ///* JMOHEP[IHEP][1] - pointer to position of 2nd mother */
48 ///* JDAHEP[IHEP][0] - pointer to position of 1st daughter */
49 ///* JDAHEP[IHEP][1] - pointer to position of 2nd daughter */
50 ///* PHEP [IHEP][0] - X momentum [Gev/c] */
51 ///* PHEP [IHEP][1] - Y momentum [Gev/c] */
52 ///* PHEP [IHEP][2] - Z momentum [Gev/c] */
53 ///* PHEP [IHEP][3] - Energy [Gev] */
54 ///* PHEP [IHEP][4] - Mass[Gev/c^2] */
55 ///* VHEP [IHEP][0] - X vertex [mm] */
56 ///* VHEP [IHEP][1] - Y vertex [mm] */
57 ///* VHEP [IHEP][2] - Z vertex [mm] */
58 ///* VHEP [IHEP][3] - production time [mm/c] */
59 ///*========================================================*/
60 //
61 // This interface to HEPEVT common block treats the block as
62 // an array of bytes --- the precision and number of entries
63 // is determined "on the fly" by the wrapper and used to decode
64 // each entry.
65 //
66 // HEPEVT_EntriesAllocation is the maximum size of the HEPEVT common block
67 // that can be interfaced. It is NOT the actual size of the HEPEVT common
68 // used in each individual application. The actual size can be changed on
69 // the fly using HepMC::HEPEVT_Wrapper::set_max_number_entries().
70 // Thus HEPEVT_EntriesAllocation should typically be set
71 // to the maximum possible number of entries --- 10000 is a good choice
72 // (and is the number used by ATLAS versions of Pythia).
73
74 #include <ctype.h>
75
76 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
77
78 enum
79 {
80 HEPEVT_EntriesAllocation = 4000
81 };
82
83 const unsigned int hepevt_bytes_allocation = sizeof(long int) * (2 + 4 * HEPEVT_EntriesAllocation)
84 + sizeof(double) * (9 * HEPEVT_EntriesAllocation);
85
86 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
87
88 extern "C" struct hepevt
89 {
90 char data[hepevt_bytes_allocation];
91 };
92
93 hepevt hepevt_;
94