Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/geometry/biasing/include/G4VImportanceAlgorithm.hh

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  1 //
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 25 //
 26 // G4VImportanceAlgorithm
 27 //
 28 // Class description:
 29 //
 30 // This is an interface used by importance sampling to get the 
 31 // number of copies and weight a mother particle should be split 
 32 // into when crossing a boundary of "importance cells". 
 33 // The interface defines the input to be the ratio of the pre over
 34 // the post importance and the weight of the mother track.
 35 // It returns a struct containing the number of copies (including 
 36 // the mother track) to be produced and the weight of each track.
 37 // A user defined algorithm deriving from this interface may be used
 38 // by the importance sampling.
 39 
 40 // Author: Michael Dressel (CERN), 2002
 41 // ----------------------------------------------------------------------
 42 #ifndef G4VIMPORTANCEALGORITHM_HH
 43 #define G4VIMPORTANCEALGORITHM_HH 1
 44 
 45 #include "G4Nsplit_Weight.hh"
 46 
 47 class G4VImportanceAlgorithm
 48 {
 49   public:  // with description
 50 
 51     G4VImportanceAlgorithm();
 52     virtual ~G4VImportanceAlgorithm();
 53     virtual G4Nsplit_Weight Calculate(G4double ipre,
 54                                       G4double ipost,
 55                                       G4double init_w) const = 0;
 56       // calculate the number of tracks and their weight according to the
 57       // pre and post importance value and the weight of the mother track
 58 };
 59 
 60 #endif
 61