Gabriele Cosmo
132 lines
4.7 KiB
C++
132 lines
4.7 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// G4TemplateRNGHelper
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//
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// Class description:
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//
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// Helper class for RNG Engine seeds.
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// Used in MT builds to guarantee event reproducibility.
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// The function of this class is to return a RNG Engine seed given its index.
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// It is a simple templated container that allows to add seeds (AddOneSeed)
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// and retrieve a seed (GetSeed) by index.
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//
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// The normal use is with G4RNGHelper where each element of the container
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// represents a seed. To enforce strong-reproducibility the variant with
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// the RNG Engine status file names is available.
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// Author: A.Dotti (SLAC), 5 July 2013
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// --------------------------------------------------------------------
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#ifndef G4TemplateRNGHelper_hh
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#define G4TemplateRNGHelper_hh 1
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#include "globals.hh"
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#include <queue>
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#include <vector>
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template<class T>
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class G4TemplateRNGHelper
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{
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public:
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using SeedsQueue = std::vector<T>;
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using SeedsQueueSize_type = typename SeedsQueue::size_type;
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public:
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// The container is modeled as a (shared) singleton
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static G4TemplateRNGHelper<T>* GetInstance();
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static G4TemplateRNGHelper<T>* GetInstanceIfExist();
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virtual ~G4TemplateRNGHelper();
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// Returns seed given id
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virtual const T GetSeed(const G4int& sdId)
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{
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G4int seedId = sdId - 2 * offset;
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if (seedId < static_cast<G4int>(seeds.size())) {
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T& seed = seeds[seedId];
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return seed;
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}
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G4ExceptionDescription msg;
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msg << "No seed number " << seedId << "(" << seeds.size() << " available)\n"
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<< " Original seed number " << sdId << " filled so far " << offset;
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G4Exception("G4RNGHelper::GetSeed", "Run0115", FatalException, msg);
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return T();
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}
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// Adds one seed to the collection
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void AddOneSeed(const T& seed) { seeds.push_back(seed); }
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// Fills N primary seed pairs
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void Fill(G4double* dbl, G4int nev, G4int nev_tot, G4int nrpe)
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{
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seeds.clear();
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for (G4int i = 0; i < nrpe * nev; ++i) {
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seeds.push_back((G4long)(100000000L * dbl[i]));
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}
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offset = 0;
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nev_filled = nev;
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nev_total = nev_tot;
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nRandParEvent = nrpe;
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}
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void Refill(G4double* dbl, G4int nev)
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{
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if (nev == 0) return;
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seeds.clear();
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for (G4int i = 0; i < nRandParEvent * nev; ++i) {
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seeds.push_back((G4long)(100000000L * dbl[i]));
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}
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offset += nev_filled;
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nev_filled = nev;
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}
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// Number of available seeds
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const SeedsQueueSize_type GetNumberSeeds() const { return seeds.size(); }
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// Empty the seeds container
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virtual void Clear() { seeds.clear(); }
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protected:
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SeedsQueue seeds;
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// Note: following numbers are number of events.
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// seeds are generated for nRandParEvent times n_event
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G4int offset = 0;
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G4int nev_filled = 0;
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G4int nev_total = 0;
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G4int nRandParEvent = 0;
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private:
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G4TemplateRNGHelper() = default;
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private:
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static G4TemplateRNGHelper<T>* instance;
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};
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using G4RNGHelper = G4TemplateRNGHelper<G4long>;
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using G4StringRNGHelper = G4TemplateRNGHelper<G4String>;
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using G4SeedsQueue = std::queue<G4long>;
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#endif
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