HepMC3 nightlies branch fixes 16122020 part 1
In this MR:
- Use free functions for HepMC3 compatibility, e.g.
HepMC::barcode
- Use c++11 loops
- Use
GenParticle->
GenParticlePtr
Edited by Andrii Verbytskyi
In this MR:
HepMC::barcode
GenParticle->
GenParticlePtr