Rivet/Projections/ImpactParameterProjection.hh

0001 // -*- C++ -*-
0002 #ifndef RIVET_IMPACTPARAMETERPROJECTION_HH
0003 #define RIVET_IMPACTPARAMETERPROJECTION_HH
0004
0005 #include "Rivet/Projections/SingleValueProjection.hh"
0006 #include "Rivet/Projections/HepMCHeavyIon.hh"
0007
0008
0009 namespace Rivet {
0010
0011   class ImpactParameterProjection: public SingleValueProjection {
0012   public:
0013
0014   using SingleValueProjection::operator=;
0015
0016   ImpactParameterProjection() {
0017     setName("ImpactParameterProjection");
0018     declare(HepMCHeavyIon(), "HepMC");
0019   }
0020
0021     /// Clone on the heap.
0022     RIVET_DEFAULT_PROJ_CLONE(ImpactParameterProjection);
0023
0024     /// Import to avoid warnings about overload-hiding
0025     using Projection::operator =;
0026
0027
0028   protected:
0029
0030     void project(const Event& e) {
0031       clear();
0032       setValue(apply<HepMCHeavyIon>(e, "HepMC").impact_parameter());
0033     }
0034
0035     CmpState compare(const Projection&) const {
0036       return CmpState::EQ;
0037     }
0038
0039   };
0040
0041 }
0042
0043 #endif