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 //---------------------------------------------------------------------
 //
 // G4BOptnLeadingParticle
 //
 // Class Description:
 //       A G4VBiasingOperation that implements the so-called "Leading
 //   particle biasing scheme". It is of interest in the shield problem
 //   to estimate the flux leaking from the shield.
 //       It works as follows:
 //       - it is intented for hadronic inelastic interaction
 //       - at each interaction, are kept:
 //           - the most energetic particle (the leading particle)
 //               - with unmodified weight
 //           - randomly one particle of each species
 //               - with this particle weight = n * primary_weight where
 //                 n is the number of particles of this species
 //---------------------------------------------------------------------
 // Initial version                                 Nov. 2019 M. Verderi
 
 
 #ifndef G4BOptnLeadingParticle_hh
 #define G4BOptnLeadingParticle_hh 1
 
 #include "G4VBiasingOperation.hh"
 #include "G4ParticleChange.hh"
 
 class G4BOptnLeadingParticle : public G4VBiasingOperation {
 public:
   // -- Constructor :
   G4BOptnLeadingParticle(G4String name);
   // -- destructor:
   virtual ~G4BOptnLeadingParticle();
   
 public:
   // -- Methods from G4VBiasingOperation interface:
   // ----------------------------------------------
   // -- Unused:
   virtual const G4VBiasingInteractionLaw* ProvideOccurenceBiasingInteractionLaw( const G4BiasingProcessInterface*, G4ForceCondition& ) {return nullptr;}
   // -- Used:
   virtual G4VParticleChange*                             ApplyFinalStateBiasing( const G4BiasingProcessInterface*, // -- Method used for this biasing. The related biasing operator
                                          const G4Track*,                   // -- returns this biasing operation at the post step do it level
                                          const G4Step*,                    // -- when the wrapped process has won the interaction length race.
                                          G4bool& );                        // -- The wrapped process final state is then trimmed.
   // -- Unused:
   virtual G4double                                     DistanceToApplyOperation( const G4Track*,
                                          G4double,
                                          G4ForceCondition*)                                    {return 0;}
   virtual G4VParticleChange*                         GenerateBiasingFinalState( const G4Track*,
                                         const G4Step*  )                                       {return nullptr;}
 
 public:
   // -- The possibility is given to further apply a Russian roulette on tracks that are accompagnying the leading particle
   // -- after the classical leading particle biasing algorithm has been applied.
   // -- This is of interest when applying the technique to e+ -> gamma gamma for example. Given one gamma is leading,
   // -- the second one is alone in its category, hence selected. With the Russian roulette it is then possible to keep
   // -- this one randomly. This is also of interest for pi0 decays, or for brem. e- -> e- gamma where the e- or gamma
   // -- are alone in their category.
   void     SetFurtherKillingProbability( G4double p )       { fRussianRouletteKillingProbability = p;    }   // -- if p <= 0.0 the killing is ignored.
   G4double GetFurtherKillingProbability()             const { return fRussianRouletteKillingProbability; }
   
 private:
   // -- Particle change used to return the trimmed final state:
   G4ParticleChange fParticleChange;
   G4double         fRussianRouletteKillingProbability;
 
   
 };
 
 #endif

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