2 #ifndef RIVET_InitialQuarks_HH
3 #define RIVET_InitialQuarks_HH
5 #include "Rivet/Projection.hh"
6 #include "Rivet/Particle.hh"
7 #include "Rivet/Event.hh"
39 virtual bool empty()
const {
return _theParticles.empty(); }
41 virtual bool isEmpty()
const {
return _theParticles.empty(); }