include/Geant4/G4VImportanceAlgorithm.hh

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0025 //
0026 // G4VImportanceAlgorithm
0027 //
0028 // Class description:
0029 //
0030 // This is an interface used by importance sampling to get the
0031 // number of copies and weight a mother particle should be split
0032 // into when crossing a boundary of "importance cells".
0033 // The interface defines the input to be the ratio of the pre over
0034 // the post importance and the weight of the mother track.
0035 // It returns a struct containing the number of copies (including
0036 // the mother track) to be produced and the weight of each track.
0037 // A user defined algorithm deriving from this interface may be used
0038 // by the importance sampling.
0039
0040 // Author: Michael Dressel (CERN), 2002
0041 // ----------------------------------------------------------------------
0042 #ifndef G4VIMPORTANCEALGORITHM_HH
0043 #define G4VIMPORTANCEALGORITHM_HH 1
0044
0045 #include "G4Nsplit_Weight.hh"
0046
0047 class G4VImportanceAlgorithm
0048 {
0049   public:  // with description
0050
0051     G4VImportanceAlgorithm();
0052     virtual ~G4VImportanceAlgorithm();
0053     virtual G4Nsplit_Weight Calculate(G4double ipre,
0054                                       G4double ipost,
0055                                       G4double init_w) const = 0;
0056       // calculate the number of tracks and their weight according to the
0057       // pre and post importance value and the weight of the mother track
0058 };
0059
0060 #endif