ImpactParameterProjection.hh

// -*- C++ -*-
#ifndef RIVET_IMPACTPARAMETERPROJECTION_HH
#define RIVET_IMPACTPARAMETERPROJECTION_HH
 
#include "Rivet/Projections/SingleValueProjection.hh"
#include "Rivet/Projections/HepMCHeavyIon.hh"
 
 
namespace Rivet {
 
class ImpactParameterProjection: public SingleValueProjection {
public:
  
  ImpactParameterProjection() {
    setName("ImpactParameterProjection");
    declare(HepMCHeavyIon(), "HepMC");
  }
 
  DEFAULT_RIVET_PROJ_CLONE(ImpactParameterProjection);
 
protected:
 
  void project(const Event& e) {
    clear();
    set(apply<HepMCHeavyIon>(e, "HepMC").impact_parameter());
  }
 
  CmpState compare(const Projection& p) const {
    return CmpState::EQ;
  }
  
};
 
}
 
#endif