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G4VImportanceAlgorithm.hh
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27 // $Id$
28 //
29 // ----------------------------------------------------------------------
30 // Class G4VImportanceAlgorithm
31 //
32 // Class description:
33 //
34 // This is an interface used by importance sampling to get the
35 // number of copies and weight a mother particle should be split
36 // into when crossing a boundary of "importance cells".
37 // The interface defines the input to be the ratio of the pre over
38 // the post importance and the weight of the mother track.
39 // It returns a struct containing the number of copies (including
40 // the mother track) to be produced and the weight of each track.
41 // A user defined algorithm deriving from this interface may be used
42 // by the importance sampling.
43 
44 // Author: Michael Dressel (Michael.Dressel@cern.ch)
45 // ----------------------------------------------------------------------
46 #ifndef G4VImportanceAlgorithm_hh
47 #define G4VImportanceAlgorithm_hh G4VImportanceAlgorithm_hh
48 
49 #include "G4Nsplit_Weight.hh"
50 
52 {
53 
54 public: // with description
55 
57  virtual ~G4VImportanceAlgorithm();
58  virtual G4Nsplit_Weight Calculate(G4double ipre,
59  G4double ipost,
60  G4double init_w) const = 0;
61  // calculate the number of tracks and their weight according
62  // to the pre and post importance value and the weight of
63  // the mother track.
64 };
65 
66 #endif