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 /// \file GB01/include/GB01BOptrChangeCrossSection.hh
 /// \brief Definition of the GB01BOptrChangeCrossSection class
 //
 //---------------------------------------------------------------
 //
 // GB01BOptrChangeCrossSection
 //
 // Class Description:
 //        A G4VBiasingOperator concrete implementation example to
 //    illustrate how to bias physics processes cross-section for
 //    one particle type.
 //        The G4VBiasingOperation G4BOptnChangeCrossSection is
 //    selected by this operator, and is sent to each process
 //    calling the operator.
 //        A simple constant bias to the cross-section is applied,
 //    but more sophisticated changes can be applied.
 //
 //---------------------------------------------------------------
 //
 
 #ifndef GB01BOptrChangeCrossSection_hh
 #define GB01BOptrChangeCrossSection_hh 1
 
 #include "G4VBiasingOperator.hh"
 class G4BOptnChangeCrossSection;
 class G4ParticleDefinition;
 #include <map>
 
 class GB01BOptrChangeCrossSection : public G4VBiasingOperator
 {
   public:
     // ------------------------------------------------------------
     // -- Constructor: takes the name of the particle type to bias:
     // ------------------------------------------------------------
     GB01BOptrChangeCrossSection(G4String particleToBias, G4String name = "ChangeXS");
     ~GB01BOptrChangeCrossSection() override;
 
     // -- method called at beginning of run:
     void StartRun() override;
 
   private:
     // -----------------------------
     // -- Mandatory from base class:
     // -----------------------------
     // -- This method returns the biasing operation that will bias the physics process occurence.
     G4VBiasingOperation*
     ProposeOccurenceBiasingOperation(const G4Track* track,
                                      const G4BiasingProcessInterface* callingProcess) override;
     // -- Methods not used:
     G4VBiasingOperation*
     ProposeFinalStateBiasingOperation(const G4Track*, const G4BiasingProcessInterface*) override
     {
       return nullptr;
     }
     G4VBiasingOperation*
     ProposeNonPhysicsBiasingOperation(const G4Track*, const G4BiasingProcessInterface*) override
     {
       return nullptr;
     }
 
   private:
     // -- ("using" is 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):
     void OperationApplied(const G4BiasingProcessInterface* callingProcess,
                           G4BiasingAppliedCase biasingCase,
                           G4VBiasingOperation* occurenceOperationApplied,
                           G4double weightForOccurenceInteraction,
                           G4VBiasingOperation* finalStateOperationApplied,
                           const G4VParticleChange* particleChangeProduced) override;
 
   private:
     // -- List of associations between processes and biasing operations:
     std::map<const G4BiasingProcessInterface*, G4BOptnChangeCrossSection*>
       fChangeCrossSectionOperations;
     G4bool fSetup;
     const G4ParticleDefinition* fParticleToBias;
 };
 
 #endif

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