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25 //
26 /// \file eventgenerator/HepMC/HepMCEx02/src/HEPEvtcom.cc
27 /// \brief Implementation of the HEPEvtcom class
28 //
29 // ======================================================================
30 // PARAMETER (NMXHEP=4000)
31 // COMMON/HEPEVT/NEVHEP,NHEP,ISTHEP(NMXHEP),IDHEP(NMXHEP),
32 // & JMOHEP(2,NMXHEP),JDAHEP(2,NMXHEP),PHEP(5,NMXHEP),VHEP(4,NMXHEP)
33 // ======================================================================
34 ///**********************************************************/
35 ///* D E S C R I P T I O N : */
36 ///*--------------------------------------------------------*/
37 ///* NEVHEP - event number (or some special meaning*/
38 ///* (see documentation for details) */
39 ///* NHEP - actual number of entries in current */
40 ///* event. */
41 ///* ISTHEP[IHEP] - status code for IHEP'th entry - see */
42 ///* documentation for details */
43 ///* IDHEP [IHEP] - IHEP'th particle identifier according*/
44 ///* to PDG. */
45 ///* JMOHEP[IHEP][0] - pointer to position of 1st mother */
46 ///* JMOHEP[IHEP][1] - pointer to position of 2nd mother */
47 ///* JDAHEP[IHEP][0] - pointer to position of 1st daughter */
48 ///* JDAHEP[IHEP][1] - pointer to position of 2nd daughter */
49 ///* PHEP [IHEP][0] - X momentum [Gev/c] */
50 ///* PHEP [IHEP][1] - Y momentum [Gev/c] */
51 ///* PHEP [IHEP][2] - Z momentum [Gev/c] */
52 ///* PHEP [IHEP][3] - Energy [Gev] */
53 ///* PHEP [IHEP][4] - Mass[Gev/c^2] */
54 ///* VHEP [IHEP][0] - X vertex [mm] */
55 ///* VHEP [IHEP][1] - Y vertex [mm] */
56 ///* VHEP [IHEP][2] - Z vertex [mm] */
57 ///* VHEP [IHEP][3] - production time [mm/c] */
58 ///*========================================================*/
59 //
60 // This interface to HEPEVT common block treats the block as
61 // an array of bytes --- the precision and number of entries
62 // is determined "on the fly" by the wrapper and used to decode
63 // each entry.
64 //
65 // HEPEVT_EntriesAllocation is the maximum size of the HEPEVT common block
66 // that can be interfaced. It is NOT the actual size of the HEPEVT common
67 // used in each individual application. The actual size can be changed on
68 // the fly using HepMC::HEPEVT_Wrapper::set_max_number_entries().
69 // Thus HEPEVT_EntriesAllocation should typically be set
70 // to the maximum possible number of entries --- 10000 is a good choice
71 // (and is the number used by ATLAS versions of Pythia).
72
73 #include <ctype.h>
74
75 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
76
77 enum
78 {
79 HEPEVT_EntriesAllocation = 4000
80 };
81
82 const unsigned int hepevt_bytes_allocation = sizeof(long int) * (2 + 4 * HEPEVT_EntriesAllocation)
83 + sizeof(double) * (9 * HEPEVT_EntriesAllocation);
84
85 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
86
87 extern "C" struct hepevt
88 {
89 char data[hepevt_bytes_allocation];
90 };
91
92 hepevt hepevt_;
93