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26 /// \file eventgenerator/HepMC/HepMCEx01/src/H 26 /// \file eventgenerator/HepMC/HepMCEx01/src/HEPEvtcom.cc
27 /// \brief Implementation of the HEPEvtcom cla 27 /// \brief Implementation of the HEPEvtcom class
28 // 28 //
29 // 29 //
30 // =========================================== 30 // ======================================================================
31 // PARAMETER (NMXHEP=4000) << 31 // PARAMETER (NMXHEP=4000)
32 // COMMON/HEPEVT/NEVHEP,NHEP,ISTHEP(NMXHE << 32 // COMMON/HEPEVT/NEVHEP,NHEP,ISTHEP(NMXHEP),IDHEP(NMXHEP),
33 // & JMOHEP(2,NMXHEP),JDAHEP(2,NMXH 33 // & JMOHEP(2,NMXHEP),JDAHEP(2,NMXHEP),PHEP(5,NMXHEP),VHEP(4,NMXHEP)
34 // =========================================== 34 // ======================================================================
35 ///******************************************* 35 ///**********************************************************/
36 ///* D E S C R I P T I O N : 36 ///* D E S C R I P T I O N : */
37 ///*------------------------------------------ 37 ///*--------------------------------------------------------*/
38 ///* NEVHEP - event number (or some s 38 ///* NEVHEP - event number (or some special meaning*/
39 ///* (see documentation for 39 ///* (see documentation for details) */
40 ///* NHEP - actual number of entrie 40 ///* NHEP - actual number of entries in current */
41 ///* event. 41 ///* event. */
42 ///* ISTHEP[IHEP] - status code for IHEP'th 42 ///* ISTHEP[IHEP] - status code for IHEP'th entry - see */
43 ///* documentation for deta 43 ///* documentation for details */
44 ///* IDHEP [IHEP] - IHEP'th particle identi 44 ///* IDHEP [IHEP] - IHEP'th particle identifier according*/
45 ///* to PDG. 45 ///* to PDG. */
46 ///* JMOHEP[IHEP][0] - pointer to position of 46 ///* JMOHEP[IHEP][0] - pointer to position of 1st mother */
47 ///* JMOHEP[IHEP][1] - pointer to position of 47 ///* JMOHEP[IHEP][1] - pointer to position of 2nd mother */
48 ///* JDAHEP[IHEP][0] - pointer to position of 48 ///* JDAHEP[IHEP][0] - pointer to position of 1st daughter */
49 ///* JDAHEP[IHEP][1] - pointer to position of 49 ///* JDAHEP[IHEP][1] - pointer to position of 2nd daughter */
50 ///* PHEP [IHEP][0] - X momentum [Gev/c] 50 ///* PHEP [IHEP][0] - X momentum [Gev/c] */
51 ///* PHEP [IHEP][1] - Y momentum [Gev/c] 51 ///* PHEP [IHEP][1] - Y momentum [Gev/c] */
52 ///* PHEP [IHEP][2] - Z momentum [Gev/c] 52 ///* PHEP [IHEP][2] - Z momentum [Gev/c] */
53 ///* PHEP [IHEP][3] - Energy [Gev] 53 ///* PHEP [IHEP][3] - Energy [Gev] */
54 ///* PHEP [IHEP][4] - Mass[Gev/c^2] 54 ///* PHEP [IHEP][4] - Mass[Gev/c^2] */
55 ///* VHEP [IHEP][0] - X vertex [mm] 55 ///* VHEP [IHEP][0] - X vertex [mm] */
56 ///* VHEP [IHEP][1] - Y vertex [mm] 56 ///* VHEP [IHEP][1] - Y vertex [mm] */
57 ///* VHEP [IHEP][2] - Z vertex [mm] 57 ///* VHEP [IHEP][2] - Z vertex [mm] */
58 ///* VHEP [IHEP][3] - production time [mm/c] 58 ///* VHEP [IHEP][3] - production time [mm/c] */
59 ///*========================================== 59 ///*========================================================*/
60 // 60 //
61 // This interface to HEPEVT common block treat 61 // This interface to HEPEVT common block treats the block as
62 // an array of bytes --- the precision and num << 62 // an array of bytes --- the precision and number of entries
63 // is determined "on the fly" by the wrapper a 63 // is determined "on the fly" by the wrapper and used to decode
64 // each entry. 64 // each entry.
65 // 65 //
66 // HEPEVT_EntriesAllocation is the maximum siz << 66 // HEPEVT_EntriesAllocation is the maximum size of the HEPEVT common block
67 // that can be interfaced. It is NOT the actua << 67 // that can be interfaced. It is NOT the actual size of the HEPEVT common
68 // used in each individual application. The ac 68 // used in each individual application. The actual size can be changed on
69 // the fly using HepMC::HEPEVT_Wrapper::set_ma 69 // the fly using HepMC::HEPEVT_Wrapper::set_max_number_entries().
70 // Thus HEPEVT_EntriesAllocation should typica 70 // Thus HEPEVT_EntriesAllocation should typically be set
71 // to the maximum possible number of entries - 71 // to the maximum possible number of entries --- 10000 is a good choice
72 // (and is the number used by ATLAS versions o 72 // (and is the number used by ATLAS versions of Pythia).
73 73
74 #include <ctype.h> 74 #include <ctype.h>
75 75
76 //....oooOO0OOooo........oooOO0OOooo........oo << 76 enum {HEPEVT_EntriesAllocation=4000};
77 77
78 enum << 78 const unsigned int hepevt_bytes_allocation =
79 { << 79 sizeof(long int) * ( 2 + 4 * HEPEVT_EntriesAllocation )
80 HEPEVT_EntriesAllocation = 4000 << 80 + sizeof(double) * ( 9 * HEPEVT_EntriesAllocation );
81 }; <<
82 <<
83 const unsigned int hepevt_bytes_allocation = s <<
84 + <<
85 81
86 //....oooOO0OOooo........oooOO0OOooo........oo << 82 extern "C" struct hepevt{
87 << 83 char data[hepevt_bytes_allocation];
88 extern "C" struct hepevt <<
89 { <<
90 char data[hepevt_bytes_allocation]; <<
91 }; 84 };
92 85
93 hepevt hepevt_; 86 hepevt hepevt_;
>> 87
94 88