HepMC3 event record library

pythia8 → include Relation

File in interfaces/pythia8Includes file in include
include / Pythia8 / Pythia8ToHepMC3.hHepMC3 / GenVertex.h
include / Pythia8 / Pythia8ToHepMC3.hHepMC3 / GenParticle.h
include / Pythia8 / Pythia8ToHepMC3.hHepMC3 / GenEvent.h