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:
 
  using SingleValueProjection::operator=;
 
  ImpactParameterProjection() {
    setName("ImpactParameterProjection");
    declare(HepMCHeavyIon(), "HepMC");
  }
 
    RIVET_DEFAULT_PROJ_CLONE(ImpactParameterProjection);
 
    using Projection::operator =;
 
 
  protected:
 
    void project(const Event& e) {
      clear();
      setValue(apply<HepMCHeavyIon>(e, "HepMC").impact_parameter());
    }
 
    CmpState compare(const Projection&) const {
      return CmpState::EQ;
    }
 
  };
 
}
 
#endif