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 /// \file GB01/include/GB01BOptrMultiParticleChangeCrossSection.hh
 /// \brief Definition of the GB01BOptrMultiParticleChangeCrossSection class
 //
 //-----------------------------------------------------------------
 //
 // GB01BOptrMultiParticleChangeCrossSection
 //
 // Class Description:
 //        A G4VBiasingOperator concrete implementation example to
 //    illustrate how an operator can make use of an other operator.
 //        In the present case, the GB01BOptrChangeCrossSection
 //    operator, that is made to bias processes of one particle
 //    type is instancied several times, one for each particle type
 //    to bias.
 //
 //-----------------------------------------------------------------
 //
 
 #ifndef GB01BOptrMultiParticleChangeCrossSection_hh
 #define GB01BOptrMultiParticleChangeCrossSection_hh 1
 
 #include "G4VBiasingOperator.hh"
 class GB01BOptrChangeCrossSection;
 class G4ParticleDefinition;
 
 #include <map>
 
 class GB01BOptrMultiParticleChangeCrossSection : public G4VBiasingOperator
 {
   public:
     GB01BOptrMultiParticleChangeCrossSection();
     virtual ~GB01BOptrMultiParticleChangeCrossSection() {}
 
     // ---------------------------------
     // -- Method specific to this class:
     // ---------------------------------
     // -- Each particle type for which its name is passed will be biased; *provided*
     // -- that the proper calls to biasingPhysics->Bias(particleName) have been done
     // -- in the main program.
     void AddParticle(G4String particleName);
 
   private:
     // -----------------------------
     // -- Mandatory from base class:
     // -----------------------------
     // -- This method returns a biasing operation that will bias the physics process occurence:
     virtual G4VBiasingOperation*
     ProposeOccurenceBiasingOperation(const G4Track* track,
                                      const G4BiasingProcessInterface* callingProcess);
     // -- Methods not used:
     virtual G4VBiasingOperation* ProposeFinalStateBiasingOperation(const G4Track*,
                                                                    const G4BiasingProcessInterface*)
     {
       return 0;
     }
     virtual G4VBiasingOperation* ProposeNonPhysicsBiasingOperation(const G4Track*,
                                                                    const G4BiasingProcessInterface*)
     {
       return 0;
     }
 
   private:
     // -- ("using" is to avoid compiler complaining against (false) method shadowing.)
     using G4VBiasingOperator::OperationApplied;
 
     // -- Optionnal base class method implementation.
     // -- This method is called to inform the operator that a proposed operation has been applied.
     // -- In the present case, it means that a physical interaction occured (interaction at
     // -- PostStepDoIt level):
     virtual void OperationApplied(const G4BiasingProcessInterface* callingProcess,
                                   G4BiasingAppliedCase biasingCase,
                                   G4VBiasingOperation* occurenceOperationApplied,
                                   G4double weightForOccurenceInteraction,
                                   G4VBiasingOperation* finalStateOperationApplied,
                                   const G4VParticleChange* particleChangeProduced);
 
   public:
     // -- Optionnal base class method. It is called at the time a tracking of a particle starts:
     void StartTracking(const G4Track* track);
 
   private:
     // -- List of associations between particle types and biasing operators:
     std::map<const G4ParticleDefinition*, GB01BOptrChangeCrossSection*> fBOptrForParticle;
     std::vector<const G4ParticleDefinition*> fParticlesToBias;
     GB01BOptrChangeCrossSection* fCurrentOperator;
 
     // -- count number of biased interations for current track:
     G4int fnInteractions;
 };
 
 #endif

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