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HepMC3FileReader: fix loading of run info for RootTree HepMC3 input format #1165

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Aug 31, 2023
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HepMC3FileReader: fix loading of run info for RootTree HepMC3 input format #1165

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3 changes: 2 additions & 1 deletion DDG4/hepmc/HepMC3FileReader.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -130,7 +130,8 @@ HEPMC3FileReader::HEPMC3FileReader(const std::string& nam)
m_reader = HepMC3::deduce_reader(nam);
#if HEPMC3_VERSION_CODE >= 3002006
// to get the runInfo in the Ascii reader we have to force HepMC to read the first event
m_reader->skip(1);
HepMC3::GenEvent dummy;
m_reader->read_event(dummy);
// then we get the run info (shared pointer)
auto runInfo = m_reader->run_info();
// and deallocate the reader
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