HEPEvtcom.cc

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//
//
// ======================================================================
//      PARAMETER (NMXHEP=4000) 
//      COMMON/HEPEVT/NEVHEP,NHEP,ISTHEP(NMXHEP),IDHEP(NMXHEP), 
//     &        JMOHEP(2,NMXHEP),JDAHEP(2,NMXHEP),PHEP(5,NMXHEP),VHEP(4,NMXHEP)
// ======================================================================
//
// This interface to HEPEVT common block treats the block as
// an array of bytes --- the precision and number of entries 
// is determined "on the fly" by the wrapper and used to decode
// each entry.
//
// HEPEVT_EntriesAllocation is the maximum size of the HEPEVT common block 
// that can be interfaced. It is NOT the actual size of the HEPEVT common 
// used in each individual application. The actual size can be changed on
// the fly using HepMC::HEPEVT_Wrapper::set_max_number_entries().
// Thus HEPEVT_EntriesAllocation should typically be set
// to the maximum possible number of entries --- 10000 is a good choice
// (and is the number used by ATLAS versions of Pythia).

#include <ctype.h>

enum {HEPEVT_EntriesAllocation=4000};

const unsigned int hepevt_bytes_allocation = 
sizeof(long int) * ( 2 + 4 * HEPEVT_EntriesAllocation )
  + sizeof(double) * ( 9 * HEPEVT_EntriesAllocation );

extern "C" struct hepevt{
  char data[hepevt_bytes_allocation];
};

hepevt hepevt_;