00001 // 00002 // ******************************************************************** 00003 // * License and Disclaimer * 00004 // * * 00005 // * The Geant4 software is copyright of the Copyright Holders of * 00006 // * the Geant4 Collaboration. It is provided under the terms and * 00007 // * conditions of the Geant4 Software License, included in the file * 00008 // * LICENSE and available at http://cern.ch/geant4/license . These * 00009 // * include a list of copyright holders. * 00010 // * * 00011 // * Neither the authors of this software system, nor their employing * 00012 // * institutes,nor the agencies providing financial support for this * 00013 // * work make any representation or warranty, express or implied, * 00014 // * regarding this software system or assume any liability for its * 00015 // * use. Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // 00027 // $Id$ 00028 // 00029 // ---------------------------------------------------------------------- 00030 // Class G4VImportanceAlgorithm 00031 // 00032 // Class description: 00033 // 00034 // This is an interface used by importance sampling to get the 00035 // number of copies and weight a mother particle should be split 00036 // into when crossing a boundary of "importance cells". 00037 // The interface defines the input to be the ratio of the pre over 00038 // the post importance and the weight of the mother track. 00039 // It returns a struct containing the number of copies (including 00040 // the mother track) to be produced and the weight of each track. 00041 // A user defined algorithm deriving from this interface may be used 00042 // by the importance sampling. 00043 00044 // Author: Michael Dressel (Michael.Dressel@cern.ch) 00045 // ---------------------------------------------------------------------- 00046 #ifndef G4VImportanceAlgorithm_hh 00047 #define G4VImportanceAlgorithm_hh G4VImportanceAlgorithm_hh 00048 00049 #include "G4Nsplit_Weight.hh" 00050 00051 class G4VImportanceAlgorithm 00052 { 00053 00054 public: // with description 00055 00056 G4VImportanceAlgorithm(); 00057 virtual ~G4VImportanceAlgorithm(); 00058 virtual G4Nsplit_Weight Calculate(G4double ipre, 00059 G4double ipost, 00060 G4double init_w) const = 0; 00061 // calculate the number of tracks and their weight according 00062 // to the pre and post importance value and the weight of 00063 // the mother track. 00064 }; 00065 00066 #endif