Gabriele Cosmo
128 lines
5.0 KiB
C++
128 lines
5.0 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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//
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// $Id:$
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//
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// Class G4MTRandGeneral
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//
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// Modified version with MT extensions
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// of corresponding CLHEP class RandGeneral
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// --------------------------------------------------------------------
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#ifndef G4MTRandGeneral_h
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#define G4MTRandGeneral_h 1
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#include <vector>
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#include "G4MTHepRandom.hh"
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class G4MTRandGeneral : public G4MTHepRandom
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{
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public:
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G4MTRandGeneral ( const G4double* aProbFunc,
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G4int theProbSize,
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G4int IntType=0 );
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G4MTRandGeneral ( CLHEP::HepRandomEngine& anEngine,
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const G4double* aProbFunc,
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G4int theProbSize,
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G4int IntType=0 );
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G4MTRandGeneral ( CLHEP::HepRandomEngine* anEngine,
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const G4double* aProbFunc,
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G4int theProbSize,
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G4int IntType=0 );
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// These constructors should be used to instantiate a G4MTRandGeneral
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// distribution object defining a local engine for it.
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// The static generator will be skiped by using the non-static methods
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// defined below. In case no engine is specified in the constructor, the
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// default engine used by the static generator is applied.
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// If the engine is passed by pointer the corresponding engine object
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// will be deleted by the G4MTRandGeneral destructor.
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// If the engine is passed by reference the corresponding engine object
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// will not be deleted by the G4MTRandGeneral destructor.
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// The probability distribution function (Pdf) must be provided by the user
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// as an array of positive real number. The array size must also be
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// provided. The Pdf doesn't need to be normalized to 1.
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// if IntType = 0 ( default value ) a uniform random number is
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// generated using the engine. The uniform number is then transformed
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// to the user's distribution using the cumulative probability
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// distribution constructed from his histogram. The cumulative
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// distribution is inverted using a binary search for the nearest
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// bin boundary and a linear interpolation within the
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// bin. G4MTRandGeneral therefore generates a constant density within
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// each bin.
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// if IntType = 1 no interpolation is performed and the result is a
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// discrete distribution.
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virtual ~G4MTRandGeneral();
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// Destructor
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// Methods to shoot random values using the static generator
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// N.B.: The methods are NOT static since they use nonstatic members
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// theIntegralPdf & nBins
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inline G4double shoot();
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inline void shootArray ( const G4int size, G4double* vect);
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// Methods to shoot random values using a given engine
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// by-passing the static generator.
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G4double shoot( CLHEP::HepRandomEngine* anEngine );
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void shootArray ( CLHEP::HepRandomEngine* anEngine, const G4int size,
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G4double* vect );
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// Methods using the localEngine to shoot random values, by-passing
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// the static generator.
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G4double fire();
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void fireArray ( const G4int size, G4double* vect);
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G4double operator()();
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private:
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CLHEP::HepRandomEngine* localEngine;
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G4bool deleteEngine;
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std::vector<G4double> theIntegralPdf;
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G4int nBins;
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G4double oneOverNbins;
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G4int InterpolationType;
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// Private methods to factor out replicated implementation sections
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void prepareTable(const G4double* aProbFunc);
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void useFlatDistribution();
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G4double mapRandom(G4double rand) const;
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};
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#include "G4MTRandGeneral.icc"
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#endif
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