| 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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| 27 | // $Id: G4VImportanceAlgorithm.hh,v 1.8 2006/06/29 18:16:40 gunter Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-04-beta-01 $ |
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| 29 | // |
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| 30 | // ---------------------------------------------------------------------- |
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| 31 | // Class G4VImportanceAlgorithm |
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| 32 | // |
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| 33 | // Class description: |
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| 34 | // |
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| 35 | // This is an interface used by importance sampling to get the |
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| 36 | // number of copies and weight a mother particle should be split |
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| 37 | // into when crossing a boundary of "importance cells". |
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| 38 | // The interface defines the input to be the ratio of the pre over |
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| 39 | // the post importance and the weight of the mother track. |
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| 40 | // It returns a struct containing the number of copies (including |
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| 41 | // the mother track) to be produced and the weight of each track. |
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| 42 | // A user defined algorithm deriving from this interface may be used |
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| 43 | // by the importance sampling. |
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| 44 | |
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| 45 | // Author: Michael Dressel (Michael.Dressel@cern.ch) |
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| 46 | // ---------------------------------------------------------------------- |
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| 47 | #ifndef G4VImportanceAlgorithm_hh |
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| 48 | #define G4VImportanceAlgorithm_hh G4VImportanceAlgorithm_hh |
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| 49 | |
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| 50 | #include "G4Nsplit_Weight.hh" |
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| 51 | |
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| 52 | class G4VImportanceAlgorithm |
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| 53 | { |
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| 54 | |
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| 55 | public: // with description |
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| 56 | |
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| 57 | G4VImportanceAlgorithm(); |
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| 58 | virtual ~G4VImportanceAlgorithm(); |
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| 59 | virtual G4Nsplit_Weight Calculate(G4double ipre, |
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| 60 | G4double ipost, |
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| 61 | G4double init_w) const = 0; |
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| 62 | // calculate the number of tracks and their weight according |
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| 63 | // to the pre and post importance value and the weight of |
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| 64 | // the mother track. |
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| 65 | }; |
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| 66 | |
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| 67 | #endif |
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