88 lines
4.6 KiB
C++
88 lines
4.6 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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/// \file eventgenerator/HepMC/HepMCEx01/src/HEPEvtcom.cc
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/// \brief Implementation of the HEPEvtcom class
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//
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//
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// ======================================================================
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// PARAMETER (NMXHEP=4000)
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// COMMON/HEPEVT/NEVHEP,NHEP,ISTHEP(NMXHEP),IDHEP(NMXHEP),
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// & JMOHEP(2,NMXHEP),JDAHEP(2,NMXHEP),PHEP(5,NMXHEP),VHEP(4,NMXHEP)
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// ======================================================================
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///**********************************************************/
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///* D E S C R I P T I O N : */
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///*--------------------------------------------------------*/
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///* NEVHEP - event number (or some special meaning*/
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///* (see documentation for details) */
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///* NHEP - actual number of entries in current */
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///* event. */
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///* ISTHEP[IHEP] - status code for IHEP'th entry - see */
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///* documentation for details */
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///* IDHEP [IHEP] - IHEP'th particle identifier according*/
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///* to PDG. */
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///* JMOHEP[IHEP][0] - pointer to position of 1st mother */
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///* JMOHEP[IHEP][1] - pointer to position of 2nd mother */
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///* JDAHEP[IHEP][0] - pointer to position of 1st daughter */
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///* JDAHEP[IHEP][1] - pointer to position of 2nd daughter */
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///* PHEP [IHEP][0] - X momentum [Gev/c] */
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///* PHEP [IHEP][1] - Y momentum [Gev/c] */
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///* PHEP [IHEP][2] - Z momentum [Gev/c] */
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///* PHEP [IHEP][3] - Energy [Gev] */
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///* PHEP [IHEP][4] - Mass[Gev/c^2] */
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///* VHEP [IHEP][0] - X vertex [mm] */
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///* VHEP [IHEP][1] - Y vertex [mm] */
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///* VHEP [IHEP][2] - Z vertex [mm] */
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///* VHEP [IHEP][3] - production time [mm/c] */
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///*========================================================*/
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//
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// This interface to HEPEVT common block treats the block as
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// an array of bytes --- the precision and number of entries
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// is determined "on the fly" by the wrapper and used to decode
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// each entry.
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//
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// HEPEVT_EntriesAllocation is the maximum size of the HEPEVT common block
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// that can be interfaced. It is NOT the actual size of the HEPEVT common
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// used in each individual application. The actual size can be changed on
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// the fly using HepMC::HEPEVT_Wrapper::set_max_number_entries().
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// Thus HEPEVT_EntriesAllocation should typically be set
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// to the maximum possible number of entries --- 10000 is a good choice
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// (and is the number used by ATLAS versions of Pythia).
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#include <ctype.h>
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enum {HEPEVT_EntriesAllocation=4000};
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const unsigned int hepevt_bytes_allocation =
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sizeof(long int) * ( 2 + 4 * HEPEVT_EntriesAllocation )
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+ sizeof(double) * ( 9 * HEPEVT_EntriesAllocation );
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extern "C" struct hepevt{
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char data[hepevt_bytes_allocation];
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};
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hepevt hepevt_;
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