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 //-----------------------------------------------------------------
 //
 // G4ChannelingOptrMultiParticleChangeCrossSection
 //
 // Class Description:
 //        A G4VBiasingOperator concrete implementation example to
 //    illustrate how an operator can make use of another operator.
 //        In the present case, the G4ChannelingOptrChangeCrossSection
 //    operator, that is made to bias processes of one particle
 //    type is instancied several times, one for each particle type
 //    to bias.
 //
 //-----------------------------------------------------------------
 //
 
 #ifndef G4ChannelingOptrMultiParticleChangeCrossSection_hh
 #define G4ChannelingOptrMultiParticleChangeCrossSection_hh 1
 
 #include "G4VBiasingOperator.hh"
 class G4ChannelingOptrChangeCrossSection;
 class G4ParticleDefinition;
 
 #include <map>
 
 class G4ChannelingOptrMultiParticleChangeCrossSection : public G4VBiasingOperator {
 public:
   G4ChannelingOptrMultiParticleChangeCrossSection();
   virtual ~G4ChannelingOptrMultiParticleChangeCrossSection() {}
   
   // ---------------------------------
   // -- 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 );
     void AddChargedParticles();
   
   
 private:
   // -----------------------------
   // -- Mandatory from base class:
   // -----------------------------
   // -- This method returns a biasing operation that will bias the physics process occurrence:
   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*, 
              G4ChannelingOptrChangeCrossSection* >    fBOptrForParticle;
   std::vector < const G4ParticleDefinition* >   fParticlesToBias;
   G4ChannelingOptrChangeCrossSection*                  fCurrentOperator;
 
   // -- count number of biased interations for current track:
   G4int fnInteractions;
 };
 
 #endif

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