Update MagicNumbers.h to add missing includes.
Update MagicNumbers.h to add missing includes.
Should fix the problems in master--HepMC3
nightlies reported in ATLASSIM-6153.
Edited by John Derek Chapman
Update MagicNumbers.h to add missing includes.
Should fix the problems in master--HepMC3
nightlies reported in ATLASSIM-6153.